二进制方式安装 Kubernetes1.18.3版本实现脚本-编程学习网

一、Kubernetes 简介

Kubernetes，也称为 K8s，是由 Google 公司开源的容器集群管理系统，在 Docker 技术的基础上，为容器化的应用提供部署运行、资源调度、服务发现和动态伸缩等一系列完整功能，提高了大规模容器集群管理的便捷性。Kubernetes 官方

1.Kubernetes 架构设计图

Kubernetes 是由一个 Master 和多个 Node 组成，Master 通过 API 提供服务，并接收 Kubectl 发送过来的请求来调度管理整个集群。

Kubectl 是 K8s 平台的管理命令。

在这里插入图片描述

2.Kubernetes 常见组件介绍

APIServer：所有服务的统一访问入口，并提供认证、授权、访问控制、API 注册和发现等机制；

Controller Manager（控制器）：主要就是用来维持 Pod 的一个副本数，比如故障检测、自动扩展、滚动更新等；

Scheduler（调度器）：主要就是用来分配任务到合适的节点上（资源调度）

ETCD：键值对数据库，存放了 K8s 集群中所有的重要信息（持久化）

Kubelet：直接和容器引擎交互，用来维护容器的一个生命周期；同时也负责 Volume（CVI）和网络（CNI）的管理；

Kube-Porxy：用于将规则写入至 iptables 或 IPVS 来实现服务的映射访问；

其它组件：

oreDNS：主要就是用来给 K8s 的 Service 提供一个域名和 IP 的对应解析关系。

Dashboard：主要就是用来给 K8s 提供一个 B/S 结构的访问体系（即，我们可以通过 Web 界面来对 K8s 进行管理）

Ingress Controller：主要就是用来实现 HTTP 代理（七层），官方的 Service 仅支持 TCP\UDP 代理（四层）

Prometheus：主要就是用来给 K8s 提供一个监控能力，使我们能够更加清晰的看到 K8s 相关组件及 Pod 的使用情况。

ELK：主要就是用来给 K8s 提供一个日志分析平台。

Kubernetes 工作原理：

用户可以通过 Kubectl 命令来提交需要运行的 Docker Container 到 K8s 的 APIServer 组件中；

接着 APIServer 接收到用户提交的请求后，会将请求存储到 ETCD 这个键值对存储中；

然后由 Controller Manager 组件来创建出用户定义的控制器类型（Pod ReplicaSet Deployment DaemonSet 等）

然后 Scheduler 组件会对 ETCD 进行扫描，并将用户需要运行的 Docker Container 分配到合适的主机上；

最后由 Kubelet 组件来和 Docker 容器进行交互，创建、删除、停止容器等一系列操作。

kube-proxy 主要就是为 Service 提供服务的，来实现内部从 Pod 到 Service 和外部 NodePort 到 Service 的访问。

二、Kubernetes 二进制方式安装

我们下面的安装方式就是单纯的使用二进制方式安装，并没有对 Kube-APIServer 组件进行高可用配置，因为像我们安装 K8s 的话，其实主要还是为了学习 K8s，通过 K8s 来完成某些事情，所以并不需要关心高可用这块的东西。

要是对 Kubernetes 做高可用的话，其实并不难，像一些在云上的 K8s，一般都是通过 SLB 来代理到两台不同服务器上，来实现高可用；而像云下的 K8s，基本上也是如上，我们可以通过 Keepalived 加 Nginx 来实现高可用。

准备工作：

主机名	操作系统	IP 地址	所需组件
k8s-master01	CentOS 7.4	192.168.1.1	所有组件都安装（合理利用资源）
k8s-master02	CentOS 7.4	192.168.1.2	所有组件都安装
k8s-node	CentOS 7.4	192.168.1.3	docker kubelet kube-proxy

1）在各个节点上配置主机名，并配置 Hosts 文件

[root@localhost ~]# hostnamectl set-hostname k8s-master01
[root@localhost ~]# bash
[root@k8s-master01 ~]# cat <<END >> /etc/hosts
192.168.1.1 k8s-master01
192.168.1.2 k8s-master02
192.168.1.3 k8s-node01
END

2）在 k8s-master01 上配置 SSH 密钥对，并将公钥发送给其余主机

[root@k8s-master01 ~]# ssh-keygen -t rsa												# 三连回车
[root@k8s-master01 ~]# ssh-copy-id root@192.168.1.1
[root@k8s-master01 ~]# ssh-copy-id root@192.168.1.2
[root@k8s-master01 ~]# ssh-copy-id root@192.168.1.3

3）编写 K8s 初始环境脚本

[root@k8s-master01 ~]# vim k8s-init.sh
#!/bin/bash
#****************************************************************#
# ScriptName: k8s-init.sh
# Initialize the machine. This needs to be executed on every machine.
# Mkdir k8s directory
yum -y install wget ntpdate && ntpdate ntp1.aliyun.com
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum -y install epel-release
mkdir -p /opt/k8s/bin/
mkdir -p /data/k8s/docker
mkdir -p /data/k8s/k8s
# Disable the SELinux.
swapoff -a
sed -i '/swap/s/^/#/' /etc/fstab
# Turn off and disable the firewalld.
systemctl stop firewalld
systemctl disable firewalld
# Modify related kernel parameters & Disable the swap.
cat > /etc/sysctl.d/k8s.conf << EOF
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.tcp_tw_recycle = 0
vm.swappiness = 0
vm.overcommit_memory = 1
vm.panic_on_oom = 0
net.ipv6.conf.all.disable_ipv6 = 1
EOF
sysctl -p /etc/sysctl.d/k8s.conf >& /dev/null
# Add ipvs modules
cat > /etc/sysconfig/modules/ipvs.modules << EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- br_netfilter
modprobe -- nf_conntrack
modprobe -- nf_conntrack_ipv4
EOF
chmod 755 /etc/sysconfig/modules/ipvs.modules
source /etc/sysconfig/modules/ipvs.modules
# Install rpm
yum install -y conntrack ntpdate ntp ipvsadm ipset jq iptables curl sysstat libseccomp wget gcc gcc-c++ make libnl libnl-devel libnfnetlink-devel openssl-devel vim openssl-devel bash-completion
# ADD k8s bin to PATH
echo 'export PATH=/opt/k8s/bin:$PATH' >> /root/.bashrc && chmod +x /root/.bashrc && source /root/.bashrc
[root@k8s-master01 ~]# bash k8s-init.sh

4）配置环境变量

[root@k8s-master01 ~]# vim environment.sh
#!/bin/bash
# 生成 EncryptionConfig 所需的加密 Key
export ENCRYPTION_KEY=$(head -c 32 /dev/urandom | base64)

# 集群 Master 机器 IP 数组
export MASTER_IPS=(192.168.1.1 192.168.1.2)

# 集群 Master IP 对应的主机名数组
export MASTER_NAMES=(k8s-master01 k8s-master02)

# 集群 Node 机器 IP 数组
export NODE_IPS=(192.168.1.3)

# 集群 Node IP 对应的主机名数组
export NODE_NAMES=(k8s-node01)

# 集群所有机器 IP 数组
export ALL_IPS=(192.168.1.1 192.168.1.2 192.168.1.3)

# 集群所有 IP 对应的主机名数组
export ALL_NAMES=(k8s-master01 k8s-master02 k8s-node01)

# Etcd 集群服务地址列表
export ETCD_ENDPOINTS="https://192.168.1.1:2379,https://192.168.1.2:2379"

# Etcd 集群间通信的 IP 和端口
export ETCD_NODES="k8s-master01=https://192.168.1.1:2380,k8s-master02=https://192.168.1.2:2380"

# Kube-apiserver 的 IP 和端口
export KUBE_APISERVER="https://192.168.1.1:6443"

# 节点间互联网络接口名称
export IFACE="ens32"

# Etcd 数据目录
export ETCD_DATA_DIR="/data/k8s/etcd/data"

# Etcd WAL 目录. 建议是 SSD 磁盘分区. 或者和 ETCD_DATA_DIR 不同的磁盘分区
export ETCD_WAL_DIR="/data/k8s/etcd/wal"

# K8s 各组件数据目录
export K8S_DIR="/data/k8s/k8s"

# Docker 数据目录
export DOCKER_DIR="/data/k8s/docker"

## 以下参数一般不需要修改
# TLS Bootstrapping 使用的 Token. 可以使用命令 head -c 16 /dev/urandom | od -An -t x | tr -d ' ' 生成
BOOTSTRAP_TOKEN="41f7e4ba8b7be874fcff18bf5cf41a7c"

# 最好使用当前未用的网段来定义服务网段和 Pod 网段
# 服务网段. 部署前路由不可达. 部署后集群内路由可达(kube-proxy 保证)
SERVICE_CIDR="10.20.0.0/16"

# Pod 网段. 建议 /16 段地址. 部署前路由不可达. 部署后集群内路由可达(flanneld 保证)
CLUSTER_CIDR="10.10.0.0/16"

# 服务端口范围 (NodePort Range)
export NODE_PORT_RANGE="1-65535"

# Flanneld 网络配置前缀
export FLANNEL_ETCD_PREFIX="/kubernetes/network"

# Kubernetes 服务 IP (一般是 SERVICE_CIDR 中第一个 IP)
export CLUSTER_KUBERNETES_SVC_IP="10.20.0.1"

# 集群 DNS 服务 IP (从 SERVICE_CIDR 中预分配)
export CLUSTER_DNS_SVC_IP="10.20.0.254"

# 集群 DNS 域名(末尾不带点号)
export CLUSTER_DNS_DOMAIN="cluster.local"

# 将二进制目录 /opt/k8s/bin 加到 PATH 中
export PATH=/opt/k8s/bin:$PATH

上面像那些 IP 地址和网卡啥的，你们要改成自身对应的信息。

[root@k8s-master01 ~]# chmod +x environment.sh && source environment.sh

下面的这些操作，我们只需要在 k8s-master01 主机上操作即可（因为下面我们会通过 for 循环来发送到其余主机上）

1.创建 CA 证书和密钥

因为 Kubernetes 系统的各个组件需要使用 TLS 证书对其通信加密以及授权认证，所以我们需要在安装前先生成相关的 TLS 证书；我们可以使用 openssl cfssl easyrsa 来生成 Kubernetes 的相关证书，我们下面使用的是 cfssl 方式。

1）安装 cfssl 工具集

[root@k8s-master01 ~]# mkdir -p /opt/k8s/cert
[root@k8s-master01 ~]# curl -L https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 -o /opt/k8s/bin/cfssl
[root@k8s-master01 ~]# curl -L https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64 -o /opt/k8s/bin/cfssljson
[root@k8s-master01 ~]# curl -L https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64 -o /opt/k8s/bin/cfssl-certinfo
[root@k8s-master01 ~]# chmod +x /opt/k8s/bin/*

2）创建根证书配置文件

[root@k8s-master01 ~]# mkdir -p /opt/k8s/work
[root@k8s-master01 ~]# cd /opt/k8s/work/
[root@k8s-master01 work]# cat > ca-config.json << EOF
{
    "signing": {
        "default": {
            "expiry": "876000h"
        },
        "profiles": {
            "kubernetes": {
                "expiry": "876000h",
                "usages": [
                    "signing",
                    "key encipherment",
                    "server auth",
                    "client auth"
                ]
            }
        }
    }
}
EOF

signing：表示当前证书可用于签名其它证书；

server auth：表示 Client 可以用这个 CA 对 Server 提供的证书进行校验；

client auth：表示 Server 可以用这个 CA 对 Client 提供的证书进行验证；

"expiry": "876000h"：表示当前证书有效期为 100 年；

3）创建根证书签名请求文件

[root@k8s-master01 work]# cat > ca-csr.json << EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "Shanghai",
            "L": "Shanghai",
            "O": "k8s",
            "OU": "System"
        }
    ],
    "ca": {
        "expiry": "876000h"
 }
}
EOF

CN：Kube-APIServer 将会把这个字段作为请求的用户名，来让浏览器验证网站是否合法。

C：国家；ST：州，省；L：地区，城市；O：组织名称，公司名称；OU：组织单位名称，公司部门。

4）生成 CA 密钥 ca-key.pem 和证书 ca.pem

[root@k8s-master01 work]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca

生成证书后，因为 Kubernetes 集群需要双向 TLS 认证，所以我们可以将生成的文件传送到所有主机中。

5）使用 for 循环来遍历数组，将配置发送给所有主机

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    ssh root@${all_ip} "mkdir -p /etc/kubernetes/cert"
    scp ca*.pem ca-config.json root@${all_ip}:/etc/kubernetes/cert
  done

2.安装 ETCD 组件

ETCD 是基于 Raft 的分布式 key-value 存储系统，由 CoreOS 开发，常用于服务发现、共享配置以及并发控制（如 leader 选举、分布式锁等）；Kubernetes 主要就是用 ETCD 来存储所有的运行数据。

下载 ETCD

[root@k8s-master01 work]# wget https://github.com/etcd-io/etcd/releases/download/v3.3.22/etcd-v3.3.22-linux-amd64.tar.gz
[root@k8s-master01 work]# tar -zxf etcd-v3.3.22-linux-amd64.tar.gz

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp etcd-v3.3.22-linux-amd64/etcd* root@${master_ip}:/opt/k8s/bin
    ssh root@${master_ip} "chmod +x /opt/k8s/bin/*"
  done

1）创建 ETCD 证书和密钥

[root@k8s-master01 work]# cat > etcd-csr.json << EOF
{
    "CN": "etcd",
    "hosts": [
        "127.0.0.1",
        "192.168.1.1",
        "192.168.1.2"
  ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "Shanghai",
            "L": "Shanghai",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

hosts：用来指定给 ETCD 授权的 IP 地址或域名列表。

2）生成证书和密钥

[root@k8s-master01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json -profile=kubernetes etcd-csr.json | cfssljson -bare etcd

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    ssh root@${master_ip} "mkdir -p /etc/etcd/cert"
    scp etcd*.pem root@${master_ip}:/etc/etcd/cert/
  done

3）创建启动脚本

[root@k8s-master01 work]# cat > etcd.service.template << EOF
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
Documentation=https://github.com/coreos

[Service]
Type=notify
WorkingDirectory=${ETCD_DATA_DIR}
ExecStart=/opt/k8s/bin/etcd \\
  --enable-v2=true \\
  --data-dir=${ETCD_DATA_DIR} \\
  --wal-dir=${ETCD_WAL_DIR} \\
  --name=##MASTER_NAME## \\
  --cert-file=/etc/etcd/cert/etcd.pem \\
  --key-file=/etc/etcd/cert/etcd-key.pem \\
  --trusted-ca-file=/etc/kubernetes/cert/ca.pem \\
  --peer-cert-file=/etc/etcd/cert/etcd.pem \\
  --peer-key-file=/etc/etcd/cert/etcd-key.pem \\
  --peer-trusted-ca-file=/etc/kubernetes/cert/ca.pem \\
  --peer-client-cert-auth \\
  --client-cert-auth \\
  --listen-peer-urls=https://##MASTER_IP##:2380 \\
  --initial-advertise-peer-urls=https://##MASTER_IP##:2380 \\
  --listen-client-urls=https://##MASTER_IP##:2379,http://127.0.0.1:2379 \\
  --advertise-client-urls=https://##MASTER_IP##:2379 \\
  --initial-cluster-token=etcd-cluster-0 \\
  --initial-cluster=${ETCD_NODES} \\
  --initial-cluster-state=new \\
  --auto-compaction-mode=periodic \\
  --auto-compaction-retention=1 \\
  --max-request-bytes=33554432 \\
  --quota-backend-bytes=6442450944 \\
  --heartbeat-interval=250 \\
  --election-timeout=2000
Restart=on-failure
RestartSec=5
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

[root@k8s-master01 work]# for (( A=0; A < 2; A++ ))
do
sed -e "s/##MASTER_NAME##/${MASTER_NAMES[A]}/" -e "s/##MASTER_IP##/${MASTER_IPS[A]}/" etcd.service.template > etcd-${MASTER_IPS[A]}.service
done

4）启动 ETCD

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp etcd-${master_ip}.service root@${master_ip}:/etc/systemd/system/etcd.service
    ssh root@${master_ip} "mkdir -p ${ETCD_DATA_DIR} ${ETCD_WAL_DIR}"
    ssh root@${master_ip} "systemctl daemon-reload && systemctl enable etcd && systemctl restart etcd"
  done

查看 ETCD 当前的 Leader（领导）

[root@k8s-master01 work]# ETCDCTL_API=3 /opt/k8s/bin/etcdctl \
-w table --cacert=/etc/kubernetes/cert/ca.pem \
--cert=/etc/etcd/cert/etcd.pem \
--key=/etc/etcd/cert/etcd-key.pem \
--endpoints=${ETCD_ENDPOINTS} endpoint status

在这里插入图片描述

3.安装 Flannel 网络插件

Flannel 是一种基于 overlay 网络的跨主机容器网络解决方案，也就是将 TCP 数据封装在另一种网络包里面进行路由转发和通信。Flannel 是使用 Go 语言开发的，主要就是用来让不同主机内的容器实现互联。

下载 Flannel

[root@k8s-master01 work]# mkdir flannel
[root@k8s-master01 work]# wget https://github.com/coreos/flannel/releases/download/v0.11.0/flannel-v0.11.0-linux-amd64.tar.gz
[root@k8s-master01 work]# tar -zxf flannel-v0.11.0-linux-amd64.tar.gz -C flannel

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    scp flannel/{flanneld,mk-docker-opts.sh} root@${all_ip}:/opt/k8s/bin/
    ssh root@${all_ip} "chmod +x /opt/k8s/bin/*"
  done

1）创建 Flannel 证书和密钥

[root@k8s-master01 work]# cat > flanneld-csr.json << EOF
{
    "CN": "flanneld",
    "hosts": [],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "Shanghai",
            "L": "Shanghai",
            "O": "k8s",
            "OU": "System"
        }
    ]
}
EOF

2）生成证书和密钥

[root@k8s-master01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json -profile=kubernetes flanneld-csr.json | cfssljson -bare flanneld

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    ssh root@${all_ip} "mkdir -p /etc/flanneld/cert"
    scp flanneld*.pem root@${all_ip}:/etc/flanneld/cert
  done

配置 Pod 的网段信息

[root@k8s-master01 work]# etcdctl \
--endpoints=${ETCD_ENDPOINTS} \
--ca-file=/opt/k8s/work/ca.pem \
--cert-file=/opt/k8s/work/flanneld.pem \
--key-file=/opt/k8s/work/flanneld-key.pem \
mk ${FLANNEL_ETCD_PREFIX}/config '{"Network":"'${CLUSTER_CIDR}'", "SubnetLen": 21, "Backend": {"Type": "vxlan"}}'

在这里插入图片描述

3）编写启动脚本

[root@k8s-master01 work]# cat > flanneld.service << EOF
[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
After=network-online.target
Wants=network-online.target
After=etcd.service
Before=docker.service

[Service]
Type=notify
ExecStart=/opt/k8s/bin/flanneld \\
  -etcd-cafile=/etc/kubernetes/cert/ca.pem \\
  -etcd-certfile=/etc/flanneld/cert/flanneld.pem \\
  -etcd-keyfile=/etc/flanneld/cert/flanneld-key.pem \\
  -etcd-endpoints=${ETCD_ENDPOINTS} \\
  -etcd-prefix=${FLANNEL_ETCD_PREFIX} \\
  -iface=${IFACE} \\
  -ip-masq
ExecStartPost=/opt/k8s/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker
Restart=always
RestartSec=5
StartLimitInterval=0

[Install]
WantedBy=multi-user.target
RequiredBy=docker.service
EOF

4）启动并验证

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    scp flanneld.service root@${all_ip}:/etc/systemd/system/
    ssh root@${all_ip} "systemctl daemon-reload && systemctl enable flanneld --now"
  done

1）查看 Pod 网段信息

[root@k8s-master01 work]# etcdctl \
--endpoints=${ETCD_ENDPOINTS} \
--ca-file=/etc/kubernetes/cert/ca.pem \
--cert-file=/etc/flanneld/cert/flanneld.pem \
--key-file=/etc/flanneld/cert/flanneld-key.pem \
get ${FLANNEL_ETCD_PREFIX}/config

在这里插入图片描述

2）查看已分配的 Pod 子网段列表

[root@k8s-master01 work]# etcdctl \
--endpoints=${ETCD_ENDPOINTS} \
--ca-file=/etc/kubernetes/cert/ca.pem \
--cert-file=/etc/flanneld/cert/flanneld.pem \
--key-file=/etc/flanneld/cert/flanneld-key.pem \
ls ${FLANNEL_ETCD_PREFIX}/subnets

在这里插入图片描述

3）查看某一 Pod 网段对应的节点 IP 和 Flannel 接口地址

[root@k8s-master01 work]# etcdctl \
--endpoints=${ETCD_ENDPOINTS} \
--ca-file=/etc/kubernetes/cert/ca.pem \
--cert-file=/etc/flanneld/cert/flanneld.pem \
--key-file=/etc/flanneld/cert/flanneld-key.pem \
get ${FLANNEL_ETCD_PREFIX}/subnets/10.10.208.0-21

在这里插入图片描述

4.安装 Docker 服务

Docker 运行和管理容器，Kubelet 通过 Container Runtime Interface (CRI) 与它进行交互。

下载 Docker

[root@k8s-master01 work]# wget https://download.docker.com/linux/static/stable/x86_64/docker-19.03.12.tgz
[root@k8s-master01 work]# tar -zxf docker-19.03.12.tgz

安装 Docker

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    scp docker/*  root@${all_ip}:/opt/k8s/bin/
    ssh root@${all_ip} "chmod +x /opt/k8s/bin/*"
  done

1）创建启动脚本

[root@k8s-master01 work]# cat > docker.service << "EOF"
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.io

[Service]
WorkingDirectory=##DOCKER_DIR##
Environment="PATH=/opt/k8s/bin:/bin:/sbin:/usr/bin:/usr/sbin"
EnvironmentFile=-/run/flannel/docker
ExecStart=/opt/k8s/bin/dockerd $DOCKER_NETWORK_OPTIONS
ExecReload=/bin/kill -s HUP $MAINPID
Restart=on-failure
RestartSec=5
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
Delegate=yes
KillMode=process

[Install]
WantedBy=multi-user.target
EOF

[root@k8s-master01 work]# sed -i -e "s|##DOCKER_DIR##|${DOCKER_DIR}|" docker.service
[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    scp docker.service root@${all_ip}:/etc/systemd/system/
  done

配置 daemon.json 文件

[root@k8s-master01 work]# cat > daemon.json << EOF
{
    "registry-mirrors": ["https://ipbtg5l0.mirror.aliyuncs.com"],
    "exec-opts": ["native.cgroupdriver=cgroupfs"],
    "data-root": "${DOCKER_DIR}/data",
    "exec-root": "${DOCKER_DIR}/exec",
    "log-driver": "json-file",
    "log-opts": {
      "max-size": "100m",
      "max-file": "5"
    },
    "storage-driver": "overlay2",
    "storage-opts": [
      "overlay2.override_kernel_check=true"
  ]
}
EOF

[root@k8s-master01 work]# cat > daemon.json << EOF
{
    "registry-mirrors": ["https://ipbtg5l0.mirror.aliyuncs.com"],
    "exec-opts": ["native.cgroupdriver=cgroupfs"],
    "data-root": "${DOCKER_DIR}/data",
    "exec-root": "${DOCKER_DIR}/exec",
    "log-driver": "json-file",
    "log-opts": {
      "max-size": "100m",
      "max-file": "5"
    },
    "storage-driver": "overlay2",
    "storage-opts": [
      "overlay2.override_kernel_check=true"
  ]
}
EOF

2）启动 Docker

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    ssh root@${all_ip} "systemctl daemon-reload && systemctl enable docker --now"
  done

5.安装 Kubectl 服务

下载 Kubectl

[root@k8s-master01 work]# wget https://storage.googleapis.com/kubernetes-release/release/v1.18.3/kubernetes-client-linux-amd64.tar.gz
[root@k8s-master01 work]# tar -zxf kubernetes-client-linux-amd64.tar.gz

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kubernetes/client/bin/kubectl root@${master_ip}:/opt/k8s/bin/
    ssh root@${master_ip} "chmod +x /opt/k8s/bin/*"
  done

1）创建 Admin 证书和密钥

[root@k8s-master01 work]# cat > admin-csr.json << EOF
{
    "CN": "admin",
    "hosts": [],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "ST": "Shanghai",
            "L": "Shanghai",
            "O": "system:masters",
            "OU": "System"
        }
    ]
}
EOF

2）生成证书和密钥

[root@k8s-master01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin

3）创建 Kubeconfig 文件

配置集群参数

[root@k8s-master01 work]# kubectl config set-cluster kubernetes \
--certificate-authority=/opt/k8s/work/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kubectl.kubeconfig

配置客户端认证参数

[root@k8s-master01 work]# kubectl config set-credentials admin \
--client-certificate=/opt/k8s/work/admin.pem \
--client-key=/opt/k8s/work/admin-key.pem \
--embed-certs=true \
--kubeconfig=kubectl.kubeconfig

配置上下文参数

[root@k8s-master01 work]# kubectl config set-context kubernetes \
--cluster=kubernetes \
--user=admin \
--kubeconfig=kubectl.kubeconfig

配置默认上下文

[root@k8s-master01 work]# kubectl config use-context kubernetes --kubeconfig=kubectl.kubeconfig

4）创建 Kubectl 配置文件，并配置命令补全工具

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    ssh root@${master_ip} "mkdir -p ~/.kube"
    scp kubectl.kubeconfig root@${master_ip}:~/.kube/config
    ssh root@${master_ip} "echo 'export KUBECONFIG=\$HOME/.kube/config' >> ~/.bashrc"
    ssh root@${master_ip} "echo 'source <(kubectl completion bash)' >> ~/.bashrc"
  done

下面命令需要在 k8s-master01 和 k8s-master02 上配置：

[root@k8s-master01 work]# source /usr/share/bash-completion/bash_completion
[root@k8s-master01 work]# source <(kubectl completion bash)
[root@k8s-master01 work]# bash ~/.bashrc

三、安装 Kubenetes 相关组件

1.安装 Kube-APIServer 组件

下载 Kubernetes 二进制文件

[root@k8s-master01 work]# wget https://storage.googleapis.com/kubernetes-release/release/v1.18.3/kubernetes-server-linux-amd64.tar.gz
[root@k8s-master01 work]# tar -zxf kubernetes-server-linux-amd64.tar.gz
[root@k8s-master01 work]# cd kubernetes
[root@k8s-master01 kubernetes]# tar -zxf kubernetes-src.tar.gz

[root@k8s-master01 kubernetes]# cd ..
[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp -rp kubernetes/server/bin/{apiextensions-apiserver,kube-apiserver,kube-controller-manager,kube-scheduler,kubeadm,kubectl,mounter} root@${master_ip}:/opt/k8s/bin/
    ssh root@${master_ip} "chmod +x /opt/k8s/bin/*"
  done

1）创建 Kubernetes 证书和密钥

[root@k8s-master01 work]# cat > kubernetes-csr.json << EOF
{
  "CN": "kubernetes",
  "hosts": [
    "127.0.0.1",
    "192.168.1.1",
    "192.168.1.2",
    "${CLUSTER_KUBERNETES_SVC_IP}",
    "kubernetes",
    "kubernetes.default",
    "kubernetes.default.svc",
    "kubernetes.default.svc.cluster",
    "kubernetes.default.svc.cluster.local."
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Shanghai",
      "L": "Shanghai",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

2）生成证书和密钥

[root@k8s-master01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json -profile=kubernetes kubernetes-csr.json | cfssljson -bare kubernetes

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    ssh root@${master_ip} "mkdir -p /etc/kubernetes/cert"
    scp kubernetes*.pem root@${master_ip}:/etc/kubernetes/cert/
  done

3）配置 Kube-APIServer 审计

创建加密配置文件

[root@k8s-master01 work]# cat > encryption-config.yaml << EOF
kind: EncryptionConfig
apiVersion: v1
resources:
  - resources:
      - secrets
    providers:
      - aescbc:
          keys:
            - name: zhangsan
              secret: ${ENCRYPTION_KEY}
      - identity: {}
EOF

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp encryption-config.yaml root@${master_ip}:/etc/kubernetes/encryption-config.yaml
  done

创建审计策略文件

[root@k8s-master01 work]# cat > audit-policy.yaml << EOF
apiVersion: audit.k8s.io/v1beta1
kind: Policy
rules:
  # The following requests were manually identified as high-volume and low-risk, so drop them.
  - level: None
    resources:
      - group: ""
        resources:
          - endpoints
          - services
          - services/status
    users:
      - 'system:kube-proxy'
    verbs:
      - watch

  - level: None
    resources:
      - group: ""
        resources:
          - nodes
          - nodes/status
    userGroups:
      - 'system:nodes'
    verbs:
      - get

  - level: None
    namespaces:
      - kube-system
    resources:
      - group: ""
        resources:
          - endpoints
    users:
      - 'system:kube-controller-manager'
      - 'system:kube-scheduler'
      - 'system:serviceaccount:kube-system:endpoint-controller'
    verbs:
      - get
      - update

  - level: None
    resources:
      - group: ""
        resources:
          - namespaces
          - namespaces/status
          - namespaces/finalize
    users:
      - 'system:apiserver'
    verbs:
      - get

  # Don't log HPA fetching metrics.
  - level: None
    resources:
      - group: metrics.k8s.io
    users:
      - 'system:kube-controller-manager'
    verbs:
      - get
      - list

  # Don't log these read-only URLs.
  - level: None
    nonResourceURLs:
      - '/healthz*'
      - /version
      - '/swagger*'

  # Don't log events requests.
  - level: None
    resources:
      - group: ""
        resources:
          - events

  # node and pod status calls from nodes are high-volume and can be large, don't log responses for expected updates from nodes
  - level: Request
    omitStages:
      - RequestReceived
    resources:
      - group: ""
        resources:
          - nodes/status
          - pods/status
    users:
      - kubelet
      - 'system:node-problem-detector'
      - 'system:serviceaccount:kube-system:node-problem-detector'
    verbs:
      - update
      - patch

  - level: Request
    omitStages:
      - RequestReceived
    resources:
      - group: ""
        resources:
          - nodes/status
          - pods/status
    userGroups:
      - 'system:nodes'
    verbs:
      - update
      - patch

  # deletecollection calls can be large, don't log responses for expected namespace deletions
  - level: Request
    omitStages:
      - RequestReceived
    users:
      - 'system:serviceaccount:kube-system:namespace-controller'
    verbs:
      - deletecollection

  # Secrets, ConfigMaps, and TokenReviews can contain sensitive & binary data,
  # so only log at the Metadata level.
  - level: Metadata
    omitStages:
      - RequestReceived
    resources:
      - group: ""
        resources:
          - secrets
          - configmaps
      - group: authentication.k8s.io
        resources:
          - tokenreviews
  # Get repsonses can be large; skip them.
  - level: Request
    omitStages:
      - RequestReceived
    resources:
      - group: ""
      - group: admissionregistration.k8s.io
      - group: apiextensions.k8s.io
      - group: apiregistration.k8s.io
      - group: apps
      - group: authentication.k8s.io
      - group: authorization.k8s.io
      - group: autoscaling
      - group: batch
      - group: certificates.k8s.io
      - group: extensions
      - group: metrics.k8s.io
      - group: networking.k8s.io
      - group: policy
      - group: rbac.authorization.k8s.io
      - group: scheduling.k8s.io
      - group: settings.k8s.io
      - group: storage.k8s.io
    verbs:
      - get
      - list
      - watch

  # Default level for known APIs
  - level: RequestResponse
    omitStages:
      - RequestReceived
    resources:
      - group: ""
      - group: admissionregistration.k8s.io
      - group: apiextensions.k8s.io
      - group: apiregistration.k8s.io
      - group: apps
      - group: authentication.k8s.io
      - group: authorization.k8s.io
      - group: autoscaling
      - group: batch
      - group: certificates.k8s.io
      - group: extensions
      - group: metrics.k8s.io
      - group: networking.k8s.io
      - group: policy
      - group: rbac.authorization.k8s.io
      - group: scheduling.k8s.io
      - group: settings.k8s.io
      - group: storage.k8s.io

  # Default level for all other requests.
  - level: Metadata
    omitStages:
      - RequestReceived
EOF

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp audit-policy.yaml root@${master_ip}:/etc/kubernetes/audit-policy.yaml
  done

4）配置 Metrics-Server

创建 metrics-server 的 CA 证书请求文件

[root@k8s-master01 work]# cat > proxy-client-csr.json << EOF
{
  "CN": "system:metrics-server",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Shanghai",
      "L": "Shanghai",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

生成证书和密钥

[root@k8s-master01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json -profile=kubernetes proxy-client-csr.json | cfssljson -bare proxy-client

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp proxy-client*.pem root@${master_ip}:/etc/kubernetes/cert/
  done

5）创建启动脚本

[root@k8s-master01 work]# cat > kube-apiserver.service.template << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
WorkingDirectory=${K8S_DIR}/kube-apiserver
ExecStart=/opt/k8s/bin/kube-apiserver \\
  --insecure-port=0 \\
  --secure-port=6443 \\
  --bind-address=##MASTER_IP## \\
  --advertise-address=##MASTER_IP## \\
  --default-not-ready-toleration-seconds=360 \\
  --default-unreachable-toleration-seconds=360 \\
  --feature-gates=DynamicAuditing=true \\
  --max-mutating-requests-inflight=2000 \\
  --max-requests-inflight=4000 \\
  --default-watch-cache-size=200 \\
  --delete-collection-workers=2 \\
  --encryption-provider-config=/etc/kubernetes/encryption-config.yaml \\
  --etcd-cafile=/etc/kubernetes/cert/ca.pem \\
  --etcd-certfile=/etc/kubernetes/cert/kubernetes.pem \\
  --etcd-keyfile=/etc/kubernetes/cert/kubernetes-key.pem \\
  --etcd-servers=${ETCD_ENDPOINTS} \\
  --tls-cert-file=/etc/kubernetes/cert/kubernetes.pem \\
  --tls-private-key-file=/etc/kubernetes/cert/kubernetes-key.pem \\
  --audit-dynamic-configuration \\
  --audit-log-maxage=30 \\
  --audit-log-maxbackup=3 \\
  --audit-log-maxsize=100 \\
  --audit-log-truncate-enabled=true \\
  --audit-log-path=${K8S_DIR}/kube-apiserver/audit.log \\
  --audit-policy-file=/etc/kubernetes/audit-policy.yaml \\
  --profiling \\
  --anonymous-auth=false \\
  --client-ca-file=/etc/kubernetes/cert/ca.pem \\
  --enable-bootstrap-token-auth=true \\
  --requestheader-allowed-names="system:metrics-server" \\
  --requestheader-client-ca-file=/etc/kubernetes/cert/ca.pem \\
  --requestheader-extra-headers-prefix=X-Remote-Extra- \\
  --requestheader-group-headers=X-Remote-Group \\
  --requestheader-username-headers=X-Remote-User \\
  --service-account-key-file=/etc/kubernetes/cert/ca.pem \\
  --authorization-mode=Node,RBAC \\
  --runtime-config=api/all=true \\
  --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,MutatingAdmissionWebhook,ValidatingAdmissionWebhook,ResourceQuota,NodeRestriction \\
  --allow-privileged=true \\
  --apiserver-count=3 \\
  --event-ttl=168h \\
  --kubelet-certificate-authority=/etc/kubernetes/cert/ca.pem \\
  --kubelet-client-certificate=/etc/kubernetes/cert/kubernetes.pem \\
  --kubelet-client-key=/etc/kubernetes/cert/kubernetes-key.pem \\
  --kubelet-https=true \\
  --kubelet-timeout=10s \\
  --proxy-client-cert-file=/etc/kubernetes/cert/proxy-client.pem \\
  --proxy-client-key-file=/etc/kubernetes/cert/proxy-client-key.pem \\
  --service-cluster-ip-range=${SERVICE_CIDR} \\
  --service-node-port-range=${NODE_PORT_RANGE} \\
  --logtostderr=true \\
  --v=2
Restart=on-failure
RestartSec=10
Type=notify
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF

6）启动 Kube-APIServer 并验证

[root@k8s-master01 work]# for (( A=0; A < 2; A++ ))
  do
    sed -e "s/##MASTER_NAME##/${MASTER_NAMES[A]}/" -e "s/##MASTER_IP##/${MASTER_IPS[A]}/" kube-apiserver.service.template > kube-apiserver-${MASTER_IPS[A]}.service
  done

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kube-apiserver-${master_ip}.service root@${master_ip}:/etc/systemd/system/kube-apiserver.service
    ssh root@${master_ip} "mkdir -p ${K8S_DIR}/kube-apiserver"
    ssh root@${master_ip} "systemctl daemon-reload && systemctl enable kube-apiserver --now"
  done

查看 Kube-APIServer 写入 ETCD 的数据

[root@k8s-master01 work]# ETCDCTL_API=3 etcdctl \
--endpoints=${ETCD_ENDPOINTS} \
--cacert=/opt/k8s/work/ca.pem \
--cert=/opt/k8s/work/etcd.pem \
--key=/opt/k8s/work/etcd-key.pem \
get /registry/ --prefix --keys-only

查看集群信息

[root@k8s-master01 work]# kubectl cluster-info
[root@k8s-master01 work]# kubectl get all --all-namespaces
[root@k8s-master01 work]# kubectl get componentstatuses
[root@k8s-master01 work]# netstat -anpt | grep 6443

在这里插入图片描述

授予 kube-apiserver 访问 kubelet API 的权限

[root@k8s-master01 work]# kubectl create clusterrolebinding kube-apiserver:kubelet-apis --clusterrole=system:kubelet-api-admin --user kubernetes

2.安装 Controller Manager 组件

1）创建 Controller Manager 证书和密钥

[root@k8s-master01 work]# cat > kube-controller-manager-csr.json << EOF
{
  "CN": "system:kube-controller-manager",
  "hosts": [
    "127.0.0.1",
    "192.168.1.1",
    "192.168.1.2"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Shanghai",
      "L": "Shanghai",
      "O": "system:kube-controller-manager",
      "OU": "System"
    }
  ]
}
EOF

2）生成证书和密钥

[root@k8s-master01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kube-controller-manager*.pem root@${master_ip}:/etc/kubernetes/cert/
  done

3）创建 Kubeconfig 文件

[root@k8s-master01 work]# kubectl config set-cluster kubernetes \
--certificate-authority=/opt/k8s/work/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-controller-manager.kubeconfig

[root@k8s-master01 work]# kubectl config set-credentials system:kube-controller-manager \
--client-certificate=kube-controller-manager.pem \
--client-key=kube-controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=kube-controller-manager.kubeconfig

[root@k8s-master01 work]# kubectl config set-context system:kube-controller-manager \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=kube-controller-manager.kubeconfig

[root@k8s-master01 work]# kubectl config use-context system:kube-controller-manager --kubeconfig=kube-controller-manager.kubeconfig
[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kube-controller-manager.kubeconfig root@${master_ip}:/etc/kubernetes/
  done

4）创建启动脚本

[root@k8s-master01 work]# cat > kube-controller-manager.service.template << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
WorkingDirectory=${K8S_DIR}/kube-controller-manager
ExecStart=/opt/k8s/bin/kube-controller-manager \\
  --secure-port=10257 \\
  --bind-address=127.0.0.1 \\
  --profiling \\
  --cluster-name=kubernetes \\
  --controllers=*,bootstrapsigner,tokencleaner \\
  --kube-api-qps=1000 \\
  --kube-api-burst=2000 \\
  --leader-elect \\
  --use-service-account-credentials\\
  --concurrent-service-syncs=2 \\
  --tls-cert-file=/etc/kubernetes/cert/kube-controller-manager.pem \\
  --tls-private-key-file=/etc/kubernetes/cert/kube-controller-manager-key.pem \\
  --authentication-kubeconfig=/etc/kubernetes/kube-controller-manager.kubeconfig \\
  --client-ca-file=/etc/kubernetes/cert/ca.pem \\
  --requestheader-allowed-names="system:metrics-server" \\
  --requestheader-client-ca-file=/etc/kubernetes/cert/ca.pem \\
  --requestheader-extra-headers-prefix="X-Remote-Extra-" \\
  --requestheader-group-headers=X-Remote-Group \\
  --requestheader-username-headers=X-Remote-User \\
  --cluster-signing-cert-file=/etc/kubernetes/cert/ca.pem \\
  --cluster-signing-key-file=/etc/kubernetes/cert/ca-key.pem \\
  --experimental-cluster-signing-duration=87600h \\
  --horizontal-pod-autoscaler-sync-period=10s \\
  --concurrent-deployment-syncs=10 \\
  --concurrent-gc-syncs=30 \\
  --node-cidr-mask-size=24 \\
  --service-cluster-ip-range=${SERVICE_CIDR} \\
  --cluster-cidr=${CLUSTER_CIDR} \\
  --pod-eviction-timeout=6m \\
  --terminated-pod-gc-threshold=10000 \\
  --root-ca-file=/etc/kubernetes/cert/ca.pem \\
  --service-account-private-key-file=/etc/kubernetes/cert/ca-key.pem \\
  --kubeconfig=/etc/kubernetes/kube-controller-manager.kubeconfig \\
  --logtostderr=true \\
  --v=2
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

5）启动并验证

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kube-controller-manager.service.template root@${master_ip}:/etc/systemd/system/kube-controller-manager.service
    ssh root@${master_ip} "mkdir -p ${K8S_DIR}/kube-controller-manager"
    ssh root@${master_ip} "systemctl daemon-reload && systemctl enable kube-controller-manager --now"
  done

查看输出的 Metrics

[root@k8s-master01 work]# curl -s --cacert /opt/k8s/work/ca.pem --cert /opt/k8s/work/admin.pem --key /opt/k8s/work/admin-key.pem https://127.0.0.1:10257/metrics | head

查看权限

[root@k8s-master01 work]# kubectl describe clusterrole system:kube-controller-manager
[root@k8s-master01 work]# kubectl get clusterrole | grep controller
[root@k8s-master01 work]# kubectl describe clusterrole system:controller:deployment-controller

查看当前的 Leader

[root@k8s-master01 work]# kubectl get endpoints kube-controller-manager --namespace=kube-system -o yaml

3.安装 Kube-Scheduler 组件

1）创建 Kube-Scheduler 证书和密钥

[root@k8s-master01 work]# cat > kube-scheduler-csr.json << EOF
{
  "CN": "system:kube-scheduler",
  "hosts": [
    "127.0.0.1",
    "192.168.1.1",
    "192.168.1.2"
  ],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Shanghai",
      "L": "Shanghai",
      "O": "system:kube-scheduler",
      "OU": "System"
    }
  ]
}
EOF

2）生成证书和密钥

[root@k8s-master01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kube-scheduler*.pem root@${master_ip}:/etc/kubernetes/cert/
  done

3）创建 Kubeconfig 文件

[root@k8s-master01 work]# kubectl config set-cluster kubernetes \
--certificate-authority=/opt/k8s/work/ca.pem \
--embed-certs=true \
--server=${KUBE_APISERVER} \
--kubeconfig=kube-scheduler.kubeconfig

[root@k8s-master01 work]# kubectl config set-credentials system:kube-scheduler \
--client-certificate=kube-scheduler.pem \
--client-key=kube-scheduler-key.pem \
--embed-certs=true \
--kubeconfig=kube-scheduler.kubeconfig

[root@k8s-master01 work]# kubectl config set-context system:kube-scheduler \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=kube-scheduler.kubeconfig

[root@k8s-master01 work]# kubectl config use-context system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig
[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kube-scheduler.kubeconfig root@${master_ip}:/etc/kubernetes/
  done

4）创建 Kube-Scheduler 配置文件

[root@k8s-master01 work]# cat > kube-scheduler.yaml.template << EOF
apiVersion: kubescheduler.config.k8s.io/v1alpha1
kind: KubeSchedulerConfiguration
bindTimeoutSeconds: 600
clientConnection:
  burst: 200
  kubeconfig: "/etc/kubernetes/kube-scheduler.kubeconfig"
  qps: 100
enableContentionProfiling: false
enableProfiling: true
hardPodAffinitySymmetricWeight: 1
healthzBindAddress: 127.0.0.1:10251
leaderElection:
  leaderElect: true
metricsBindAddress: 127.0.0.1:10251
EOF

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kube-scheduler.yaml.template root@${master_ip}:/etc/kubernetes/kube-scheduler.yaml
  done

5）创建启动脚本

[root@k8s-master01 work]# cat > kube-scheduler.service.template << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/GoogleCloudPlatform/kubernetes

[Service]
WorkingDirectory=${K8S_DIR}/kube-scheduler
ExecStart=/opt/k8s/bin/kube-scheduler \\
  --port=0 \\
  --secure-port=10259 \\
  --bind-address=127.0.0.1 \\
  --config=/etc/kubernetes/kube-scheduler.yaml \\
  --tls-cert-file=/etc/kubernetes/cert/kube-scheduler.pem \\
  --tls-private-key-file=/etc/kubernetes/cert/kube-scheduler-key.pem \\
  --authentication-kubeconfig=/etc/kubernetes/kube-scheduler.kubeconfig \\
  --client-ca-file=/etc/kubernetes/cert/ca.pem \\
  --requestheader-allowed-names="system:metrics-server" \\
  --requestheader-client-ca-file=/etc/kubernetes/cert/ca.pem \\
  --requestheader-extra-headers-prefix="X-Remote-Extra-" \\
  --requestheader-group-headers=X-Remote-Group \\
  --requestheader-username-headers=X-Remote-User \\
  --authorization-kubeconfig=/etc/kubernetes/kube-scheduler.kubeconfig \\
  --logtostderr=true \\
  --v=2
Restart=always
RestartSec=5
StartLimitInterval=0

[Install]
WantedBy=multi-user.target
EOF

6）启动并验证

[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    scp kube-scheduler.service.template root@${master_ip}:/etc/systemd/system/kube-scheduler.service
    ssh root@${master_ip} "mkdir -p ${K8S_DIR}/kube-scheduler"
    ssh root@${master_ip} "systemctl daemon-reload && systemctl enable kube-scheduler --now"
  done
[root@k8s-master01 work]# netstat -nlpt | grep kube-schedule

10251：接收 http 请求，非安全端口，不需要认证授权；

10259：接收 https 请求，安全端口，需要认认证授权（两个接口都对外提供 /metrics 和 /healthz 的访问）

查看输出的 Metrics

[root@k8s-master01 work]# curl -s --cacert /opt/k8s/work/ca.pem --cert /opt/k8s/work/admin.pem --key /opt/k8s/work/admin-key.pem https://127.0.0.1:10257/metrics | head

查看权限

[root@k8s-master01 work]# kubectl describe clusterrole system:kube-controller-manager
[root@k8s-master01 work]# kubectl get clusterrole | grep controller
[root@k8s-master01 work]# kubectl describe clusterrole system:controller:deployment-controller

查看当前的 Leader

[root@k8s-master01 work]# kubectl get endpoints kube-controller-manager --namespace=kube-system -o yaml

4.安装 Kubelet 组件

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    scp kubernetes/server/bin/kubelet root@${all_ip}:/opt/k8s/bin/
    ssh root@${all_ip} "chmod +x /opt/k8s/bin/*"
  done

[root@k8s-master01 work]# for all_name in ${ALL_NAMES[@]}
  do
    echo ">>> ${all_name}"
    export BOOTSTRAP_TOKEN=$(kubeadm token create \
      --description kubelet-bootstrap-token \
      --groups system:bootstrappers:${all_name} \
      --kubeconfig ~/.kube/config)
    kubectl config set-cluster kubernetes \
      --certificate-authority=/etc/kubernetes/cert/ca.pem \
      --embed-certs=true \
      --server=${KUBE_APISERVER} \
      --kubeconfig=kubelet-bootstrap-${all_name}.kubeconfig
    kubectl config set-credentials kubelet-bootstrap \
      --token=${BOOTSTRAP_TOKEN} \
      --kubeconfig=kubelet-bootstrap-${all_name}.kubeconfig
    kubectl config set-context default \
      --cluster=kubernetes \
      --user=kubelet-bootstrap \
      --kubeconfig=kubelet-bootstrap-${all_name}.kubeconfig
    kubectl config use-context default --kubeconfig=kubelet-bootstrap-${all_name}.kubeconfig
  done

[root@k8s-master01 work]# kubeadm token list --kubeconfig ~/.kube/config					# 查看 Kubeadm 为各节点创建的 Token
[root@k8s-master01 work]# kubectl get secrets -n kube-system | grep bootstrap-token			# 查看各 Token 关联的 Secret

在这里插入图片描述

[root@k8s-master01 work]# for all_name in ${ALL_NAMES[@]}
  do
    echo ">>> ${all_name}"
    scp kubelet-bootstrap-${all_name}.kubeconfig root@${all_name}:/etc/kubernetes/kubelet-bootstrap.kubeconfig
  done

创建 Kubelet 参数配置文件

[root@k8s-master01 work]# cat > kubelet-config.yaml.template << EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: "##ALL_IP##"
staticPodPath: ""
syncFrequency: 1m
fileCheckFrequency: 20s
httpCheckFrequency: 20s
staticPodURL: ""
port: 10250
readOnlyPort: 0
rotateCertificates: true
serverTLSBootstrap: true
authentication:
  anonymous:
    enabled: false
  webhook:
    enabled: true
  x509:
    clientCAFile: "/etc/kubernetes/cert/ca.pem"
authorization:
  mode: Webhook
registryPullQPS: 0
registryBurst: 20
eventRecordQPS: 0
eventBurst: 20
enableDebuggingHandlers: true
enableContentionProfiling: true
healthzPort: 10248
healthzBindAddress: "##ALL_IP##"
clusterDomain: "${CLUSTER_DNS_DOMAIN}"
clusterDNS:
  - "${CLUSTER_DNS_SVC_IP}"
nodeStatusUpdateFrequency: 10s
nodeStatusReportFrequency: 1m
imageMinimumGCAge: 2m
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
volumeStatsAggPeriod: 1m
kubeletCgroups: ""
systemCgroups: ""
cgroupRoot: ""
cgroupsPerQOS: true
cgroupDriver: cgroupfs
runtimeRequestTimeout: 10m
hairpinMode: promiscuous-bridge
maxPods: 220
podCIDR: "${CLUSTER_CIDR}"
podPidsLimit: -1
resolvConf: /etc/resolv.conf
maxOpenFiles: 1000000
kubeAPIQPS: 1000
kubeAPIBurst: 2000
serializeImagePulls: false
evictionHard:
  memory.available:  "100Mi"
nodefs.available:  "10%"
nodefs.inodesFree: "5%"
imagefs.available: "15%"
evictionSoft: {}
enableControllerAttachDetach: true
failSwapOn: true
containerLogMaxSize: 20Mi
containerLogMaxFiles: 10
systemReserved: {}
kubeReserved: {}
systemReservedCgroup: ""
kubeReservedCgroup: ""
enforceNodeAllocatable: ["pods"]
EOF

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    sed -e "s/##ALL_IP##/${all_ip}/" kubelet-config.yaml.template > kubelet-config-${all_ip}.yaml.template
    scp kubelet-config-${all_ip}.yaml.template root@${all_ip}:/etc/kubernetes/kubelet-config.yaml
  done

1）创建 Kubelet 启动脚本

[root@k8s-master01 work]# cat > kubelet.service.template << EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Requires=docker.service

[Service]
WorkingDirectory=${K8S_DIR}/kubelet
ExecStart=/opt/k8s/bin/kubelet \\
  --bootstrap-kubeconfig=/etc/kubernetes/kubelet-bootstrap.kubeconfig \\
  --cert-dir=/etc/kubernetes/cert \\
  --cgroup-driver=cgroupfs \\
  --cni-conf-dir=/etc/cni/net.d \\
  --container-runtime=docker \\
  --container-runtime-endpoint=unix:///var/run/dockershim.sock \\
  --root-dir=${K8S_DIR}/kubelet \\
  --kubeconfig=/etc/kubernetes/kubelet.kubeconfig \\
  --config=/etc/kubernetes/kubelet-config.yaml \\
  --hostname-override=##ALL_NAME## \\
  --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause-amd64:3.2 \\
  --image-pull-progress-deadline=15m \\
  --volume-plugin-dir=${K8S_DIR}/kubelet/kubelet-plugins/volume/exec/ \\
  --logtostderr=true \\
  --v=2
Restart=always
RestartSec=5
StartLimitInterval=0

[Install]
WantedBy=multi-user.target
EOF

2）启动并验证

授权

[root@k8s-master01 ~]# kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --group=system:bootstrappers

启动 Kubelet

[root@k8s-master01 work]# for all_name in ${ALL_NAMES[@]}
  do
    echo ">>> ${all_name}"
    ssh root@${all_name} "mkdir -p ${K8S_DIR}/kubelet/kubelet-plugins/volume/exec/"
    ssh root@${all_name} "systemctl daemon-reload && systemctl enable kubelet --now"
  done

查看 Kubelet 服务

[root@k8s-master01 work]# for all_name in ${ALL_NAMES[@]}
  do
    echo ">>> ${all_name}"
    ssh root@${all_name} "systemctl status kubelet | grep active"
  done
[root@k8s-master01 work]# kubectl get csr									# 因为我们还没做认证. 所以显示 Pengding 状态

在这里插入图片描述

3）Approve CSR 请求

自动 Approve CSR 请求（创建三个 ClusterRoleBinding，分别用于自动 approve client renew client renew server 证书）

[root@k8s-master01 work]# cat > csr-crb.yaml << EOF
 # Approve all CSRs for the group "system:bootstrappers"
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: auto-approve-csrs-for-group
 subjects:
 - kind: Group
   name: system:bootstrappers
   apiGroup: rbac.authorization.k8s.io
 roleRef:
   kind: ClusterRole
   name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
   apiGroup: rbac.authorization.k8s.io
---
 # To let a node of the group "system:nodes" renew its own credentials
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: node-client-cert-renewal
 subjects:
 - kind: Group
   name: system:nodes
   apiGroup: rbac.authorization.k8s.io
 roleRef:
   kind: ClusterRole
   name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
   apiGroup: rbac.authorization.k8s.io
---
# A ClusterRole which instructs the CSR approver to approve a node requesting a
# serving cert matching its client cert.
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: approve-node-server-renewal-csr
rules:
- apiGroups: ["certificates.k8s.io"]
  resources: ["certificatesigningrequests/selfnodeserver"]
  verbs: ["create"]
---
 # To let a node of the group "system:nodes" renew its own server credentials
 kind: ClusterRoleBinding
 apiVersion: rbac.authorization.k8s.io/v1
 metadata:
   name: node-server-cert-renewal
 subjects:
 - kind: Group
   name: system:nodes
   apiGroup: rbac.authorization.k8s.io
 roleRef:
   kind: ClusterRole
   name: approve-node-server-renewal-csr
   apiGroup: rbac.authorization.k8s.io
EOF
[root@k8s-master01 work]# kubectl apply -f csr-crb.yaml

验证（等待一段时间 1 ~ 5 分钟)，三个节点的 CSR 都自动 approved）

[root@k8s-master01 work]# kubectl get csr | grep boot				# 等待一段时间 (1-10 分钟)，三个节点的 CSR 都自动 approved
[root@k8s-master01 work]# kubectl get nodes							# 所有节点均 Ready

在这里插入图片描述

[root@k8s-master01 ~]# ls -l /etc/kubernetes/kubelet.kubeconfig
[root@k8s-master01 ~]# ls -l /etc/kubernetes/cert/ | grep kubelet

在这里插入图片描述

4）手动 Approve Server Cert Csr

基于安全性考虑，CSR approving controllers 不会自动 approve kubelet server 证书签名请求，需要手动 approve

[root@k8s-master01 ~]# kubectl get csr | grep node

在这里插入图片描述

[root@k8s-master01 ~]# kubectl get csr | grep Pending | awk '{print $1}' | xargs kubectl certificate approve
[root@k8s-master01 ~]# ls -l /etc/kubernetes/cert/kubelet-*

在这里插入图片描述

5）Kubelet API 接口配置

[root@k8s-master01 ~]# curl -s --cacert /etc/kubernetes/cert/ca.pem https://192.168.1.1:10250/metrics
[root@k8s-master01 ~]# curl -s --cacert /etc/kubernetes/cert/ca.pem -H "Authorization: Bearer 123456" https://192.168.1.1:10250/metrics

Kubelet API 认证和授权

// 默认权限不足
[root@k8s-master01 ~]# curl -s --cacert /etc/kubernetes/cert/ca.pem --cert /etc/kubernetes/cert/kube-controller-manager.pem --key /etc/kubernetes/cert/kube-controller-manager-key.pem https://192.168.1.1:10250/metrics
// 使用最高权限的 admin
[root@k8s-master01 ~]# curl -s --cacert /etc/kubernetes/cert/ca.pem --cert /opt/k8s/work/admin.pem --key /opt/k8s/work/admin-key.pem https://192.168.1.1:10250/metrics | head

在这里插入图片描述

证书认证和授权

// 默认权限不足
[root@k8s-master01 ~]# curl -s --cacert /etc/kubernetes/cert/ca.pem --cert /etc/kubernetes/cert/kube-controller-manager.pem --key /etc/kubernetes/cert/kube-controller-manager-key.pem https://192.168.1.1:10250/metrics
// 使用最高权限的 admin
[root@k8s-master01 ~]# curl -s --cacert /etc/kubernetes/cert/ca.pem --cert /opt/k8s/work/admin.pem --key /opt/k8s/work/admin-key.pem https://192.168.1.1:10250/metrics | head

创建 Bear Token 认证和授权

[root@k8s-master01 ~]# kubectl create serviceaccount kubelet-api-test
[root@k8s-master01 ~]# kubectl create clusterrolebinding kubelet-api-test --clusterrole=system:kubelet-api-admin --serviceaccount=default:kubelet-api-test
[root@k8s-master01 ~]# SECRET=$(kubectl get secrets | grep kubelet-api-test | awk '{print $1}')
[root@k8s-master01 ~]# TOKEN=$(kubectl describe secret ${SECRET} | grep -E '^token' | awk '{print $2}')
[root@k8s-master01 ~]# echo ${TOKEN}

[root@k8s-master01 ~]# curl -s --cacert /etc/kubernetes/cert/ca.pem -H "Authorization: Bearer ${TOKEN}" https://192.168.1.1:10250/metrics | head

5.安装 Kube-Proxy 组件

Kube-Proxy 运行在所有主机上，用来监听 APIServer 中的 Service 和 Endpoint 的变化情况，并创建路由规则来提供服务 IP 和负载均衡功能。

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    scp kubernetes/server/bin/kube-proxy root@${all_ip}:/opt/k8s/bin/
    ssh root@${all_ip} "chmod +x /opt/k8s/bin/*"
  done

1）创建 Kube-Proxy 证书和密钥

创建 Kube-Proxy 的 CA 证书请求文件

[root@k8s-master01 work]# cat > kube-proxy-csr.json << EOF
{
  "CN": "system:kube-proxy",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "Shanghai",
      "L": "Shanghai",
      "O": "k8s",
      "OU": "System"
    }
  ]
}
EOF

2）生成证书和密钥

[root@k8s-master01 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem -ca-key=/opt/k8s/work/ca-key.pem -config=/opt/k8s/work/ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy

3）创建 Kubeconfig 文件

[root@k8s-master01 work]# kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/k8s/work/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig
[root@k8s-master01 work]# kubectl config set-credentials kube-proxy \
  --client-certificate=kube-proxy.pem \
  --client-key=kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig
[root@k8s-master01 work]# kubectl config set-context default \
  --cluster=kubernetes \
  --user=kube-proxy \
  --kubeconfig=kube-proxy.kubeconfig
[root@k8s-master01 work]# kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    scp kube-proxy.kubeconfig root@${all_ip}:/etc/kubernetes/
  done

4）创建 Kube-Proxy 配置文件

[root@k8s-master01 work]# cat > kube-proxy-config.yaml.template << EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
clientConnection:
  burst: 200
  kubeconfig: "/etc/kubernetes/kube-proxy.kubeconfig"
  qps: 100
bindAddress: ##ALL_IP##
healthzBindAddress: ##ALL_IP##:10256
metricsBindAddress: ##ALL_IP##:10249
enableProfiling: true
clusterCIDR: ${CLUSTER_CIDR}
hostnameOverride: ##ALL_NAME##
mode: "ipvs"
portRange: ""
kubeProxyIPTablesConfiguration:
  masqueradeAll: false
kubeProxyIPVSConfiguration:
  scheduler: rr
  excludeCIDRs: []
EOF

[root@k8s-master01 work]# for (( i=0; i < 3; i++ ))
  do
    echo ">>> ${ALL_NAMES[i]}"
    sed -e "s/##ALL_NAME##/${ALL_NAMES[i]}/" -e "s/##ALL_IP##/${ALL_IPS[i]}/" kube-proxy-config.yaml.template > kube-proxy-config-${ALL_NAMES[i]}.yaml.template
    scp kube-proxy-config-${ALL_NAMES[i]}.yaml.template root@${ALL_NAMES[i]}:/etc/kubernetes/kube-proxy-config.yaml
  done

4）创建启动脚本

[root@k8s-master01 work]# cat > kube-proxy.service << EOF
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=network.target
[Service]
WorkingDirectory=${K8S_DIR}/kube-proxy
ExecStart=/opt/k8s/bin/kube-proxy \\
  --config=/etc/kubernetes/kube-proxy-config.yaml \\
  --logtostderr=true \\
  --v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF

[root@k8s-master01 work]# for all_name in ${ALL_NAMES[@]}
  do
    echo ">>> ${all_name}"
    scp kube-proxy.service root@${all_name}:/etc/systemd/system/
  done

5）启动并验证

[root@k8s-master01 work]# for all_ip in ${ALL_IPS[@]}
  do
    echo ">>> ${all_ip}"
    ssh root@${all_ip} "mkdir -p ${K8S_DIR}/kube-proxy"
    ssh root@${all_ip} "modprobe ip_vs_rr"
    ssh root@${all_ip} "systemctl daemon-reload && systemctl enable kube-proxy --now"
  done

查看 ipvs 路由规则

[root@k8s-master01 work]# ipvsadm -ln

在这里插入图片描述

问题：当我们在启动 kube-proxy 组件后，通过 systemctl 查看该组件状态时，出现如下错误

Not using `--random-fully` in the MASQUERADE rule for iptables because the local version of iptables does not support it

上面报错是因为我们的 iptables 版本不支持 --random-fully 配置（1.6.2 版本上支持），所以我们需要对 iptables 进行升级操作。

[root@master01 work]# wget https://www.netfilter.org/projects/iptables/files/iptables-1.6.2.tar.bz2 --no-check-certificate
[root@master01 work]# for all_name in ${ALL_NAMES[@]}
  do
    echo ">>> ${all_name}"
    scp iptables-1.6.2.tar.bz2 root@${all_name}:/root/
    ssh root@${all_name} "yum -y install gcc make libnftnl-devel libmnl-devel autoconf automake libtool bison flex libnetfilter_conntrack-devel libnetfilter_queue-devel libpcap-devel bzip2"
    ssh root@${all_name} "export LC_ALL=C && tar -xf iptables-1.6.2.tar.bz2 && cd iptables-1.6.2 && ./autogen.sh && ./configure && make && make install"
    ssh root@${all_name} "systemctl daemon-reload && systemctl restart kubelet && systemctl restart kube-proxy"
  done

6.安装 CoreDNS 插件

1）修改 Coredns 配置

[root@k8s-master01 ~]# cd /opt/k8s/work/kubernetes/cluster/addons/dns/coredns
[root@k8s-master01 coredns]# cp coredns.yaml.base coredns.yaml
[root@k8s-master01 coredns]# sed -i -e "s/__PILLAR__DNS__DOMAIN__/${CLUSTER_DNS_DOMAIN}/" -e "s/__PILLAR__DNS__SERVER__/${CLUSTER_DNS_SVC_IP}/" -e "s/__PILLAR__DNS__MEMORY__LIMIT__/200Mi/" coredns.yaml

2）创建 Coredns 并启动

配置调度策略

[root@k8s-master01 coredns]# vim coredns.yaml
......
apiVersion: apps/v1
kind: Deployment
......
spec:
  replicas: 2															# 配置成两个副本
......
      tolerations:
        - key: "node-role.kubernetes.io/master"
          operator: "Equal"
          value: ""
          effect: NoSchedule
      nodeSelector:
        node-role.kubernetes.io/master: "true"
......
[root@k8s-master01 coredns]# kubectl create -f coredns.yaml

在这里插入图片描述

kubectl describe pod Pod-Name -n kube-system											# Pod-Name 你们需要换成自己的

因为上面镜像使用的是 K8s 官方的镜像（国外），所以可能会出现：

Normal   BackOff    72s (x6 over 3m47s)   kubelet, k8s-master01  Back-off pulling image "k8s.gcr.io/coredns:1.6.5"
Warning  Failed     57s (x7 over 3m47s)   kubelet, k8s-master01  Error: ImagePullBackOff

出现如上问题后，我们可以通过拉取其它仓库中的镜像，拉取完后重新打个标签即可。

如：docker pull k8s.gcr.io/coredns:1.6.5

我们可以：
docker pull registry.aliyuncs.com/google_containers/coredns:1.6.5
docker tag registry.aliyuncs.com/google_containers/coredns:1.6.5 k8s.gcr.io/coredns:1.6.5

3）验证

[root@k8s-master01 coredns]# kubectl run -it --rm test-dns --image=busybox:1.28.4 sh
If you don't see a command prompt, try pressing enter.
/ # 
/ # nslookup kubernetes
Server:    10.20.0.254
Address 1: 10.20.0.254 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.20.0.1 kubernetes.default.svc.cluster.local

7.安装 Dashboard 仪表盘

[root@k8s-master01 coredns]# cd /opt/k8s/work/
[root@k8s-master01 work]# mkdir metrics
[root@k8s-master01 work]# cd metrics/
[root@k8s-master01 metrics]# wget https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.3.6/components.yaml
[root@k8s-master01 metrics]# vim components.yaml
......
apiVersion: apps/v1
kind: Deployment
metadata:
  name: metrics-server
  namespace: kube-system
  labels:
    k8s-app: metrics-server
spec:
  replicas: 2												# 修改副本数
  selector:
    matchLabels:
      k8s-app: metrics-server
  template:
    metadata:
      name: metrics-server
      labels:
        k8s-app: metrics-server
    spec:
      hostNetwork: true										# 配置主机网络
      serviceAccountName: metrics-server
      volumes:
      # mount in tmp so we can safely use from-scratch images and/or read-only containers
      - name: tmp-dir
        emptyDir: {}
      containers:
      - name: metrics-server
        image: registry.aliyuncs.com/google_containers/metrics-server-amd64:v0.3.6		# 修改镜像名
        imagePullPolicy: IfNotPresent
        args:
          - --cert-dir=/tmp
          - --secure-port=4443
          - --kubelet-insecure-tls							# 新加的
          - --kubelet-preferred-address-types=InternalIP,Hostname,InternalDNS,ExternalDNS,ExternalIP	# 新加的
......
[root@k8s-master01 metrics]# kubectl create -f components.yaml

验证：

在这里插入图片描述

1）创建证书

[root@k8s-master01 metrics]# cd /opt/k8s/work/
[root@k8s-master01 work]# mkdir -p /opt/k8s/work/dashboard/certs
[root@k8s-master01 work]# openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout tls.key -out tls.crt -subj "/C=CN/ST=ZheJiang/L=HangZhou/O=Xianghy/OU=Xianghy/CN=k8s.odocker.com"
[root@k8s-master01 work]# for master_ip in ${MASTER_IPS[@]}
  do
    echo ">>> ${master_ip}"
    ssh root@${master_ip} "mkdir -p /opt/k8s/work/dashboard/certs" 
    scp tls.* root@${master_ip}:/opt/k8s/work/dashboard/certs/
  done

2）修改 Dashboard 配置

手动创建 Secret

[root@master01 ~]# kubectl create namespace kubernetes-dashboard
[root@master01 ~]# kubectl create secret generic kubernetes-dashboard-certs --from-file=/opt/k8s/work/dashboard/certs -n kubernetes-dashboard

修改 Dashboard 配置（你们可以通过这个地址来看 Dashboard 的 yaml 文件：传送门）

[root@k8s-master01 work]# cd dashboard/
[root@k8s-master01 dashboard]# vim dashboard.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
---
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  type: NodePort
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30080
  selector:
    k8s-app: kubernetes-dashboard
---
apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-csrf
  namespace: kubernetes-dashboard
type: Opaque
data:
  csrf: ""
---
apiVersion: v1
kind: Secret
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-key-holder
  namespace: kubernetes-dashboard
type: Opaque
---
kind: ConfigMap
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard-settings
  namespace: kubernetes-dashboard
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
rules:
  - apiGroups: [""]
    resources: ["secrets"]
    resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs", "kubernetes-dashboard-csrf"]
    verbs: ["get", "update", "delete"]
  - apiGroups: [""]
    resources: ["configmaps"]
    resourceNames: ["kubernetes-dashboard-settings"]
    verbs: ["get", "update"]
  - apiGroups: [""]
    resources: ["services"]
    resourceNames: ["heapster", "dashboard-metrics-scraper"]
    verbs: ["proxy"]
  - apiGroups: [""]
    resources: ["services/proxy"]
    resourceNames: ["heapster", "http:heapster:", "https:heapster:", "dashboard-metrics-scraper", "http:dashboard-metrics-scraper"]
    verbs: ["get"]
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
rules:
  # Allow Metrics Scraper to get metrics from the Metrics server
  - apiGroups: ["metrics.k8s.io"]
    resources: ["pods", "nodes"]
    verbs: ["get", "list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: kubernetes-dashboard
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: kubernetes-dashboard
subjects:
  - kind: ServiceAccount
    name: kubernetes-dashboard
    namespace: kubernetes-dashboard
---
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: kubernetes-dashboard
  template:
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
    spec:
      containers:
        - name: kubernetes-dashboard
          image: kubernetesui/dashboard:v2.0.0-beta8
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 8443
              protocol: TCP
          args:
            - --auto-generate-certificates
            - --namespace=kubernetes-dashboard
            - --tls-key-file=tls.key
            - --tls-cert-file=tls.crt
            - --token-ttl=3600
          volumeMounts:
            - name: kubernetes-dashboard-certs
              mountPath: /certs
            - mountPath: /tmp
              name: tmp-volume
          livenessProbe:
            httpGet:
              scheme: HTTPS
              path: /
              port: 8443
            initialDelaySeconds: 30
            timeoutSeconds: 30
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      volumes:
        - name: kubernetes-dashboard-certs
          secret:
            secretName: kubernetes-dashboard-certs
        - name: tmp-volume
          emptyDir: {}
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "beta.kubernetes.io/os": linux
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
---
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 8000
      targetPort: 8000
  selector:
    k8s-app: dashboard-metrics-scraper
---
kind: Deployment
apiVersion: apps/v1
metadata:
  labels:
    k8s-app: dashboard-metrics-scraper
  name: dashboard-metrics-scraper
  namespace: kubernetes-dashboard
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      k8s-app: dashboard-metrics-scraper
  template:
    metadata:
      labels:
        k8s-app: dashboard-metrics-scraper
      annotations:
        seccomp.security.alpha.kubernetes.io/pod: 'runtime/default'
    spec:
      containers:
        - name: dashboard-metrics-scraper
          image: kubernetesui/metrics-scraper:v1.0.1
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 8000
              protocol: TCP
          livenessProbe:
            httpGet:
              scheme: HTTP
              path: /
              port: 8000
            initialDelaySeconds: 30
            timeoutSeconds: 30
          volumeMounts:
          - mountPath: /tmp
            name: tmp-volume
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            runAsUser: 1001
            runAsGroup: 2001
      serviceAccountName: kubernetes-dashboard
      nodeSelector:
        "beta.kubernetes.io/os": linux
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      volumes:
        - name: tmp-volume
          emptyDir: {}
[root@k8s-master01 dashboard]# kubectl create -f dashboard.yaml

创建管理员账户

[root@k8s-master01 dashboard]# kubectl create serviceaccount admin-user -n kubernetes-dashboard
[root@k8s-master01 dashboard]# kubectl create clusterrolebinding admin-user --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:admin-user

3）验证

获取登录令牌

[root@k8s-master01 dashboard]# kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep admin-user | awk '{print $1}')

在这里插入图片描述

访问：https://192.168.1.1:30080

在这里插入图片描述

到此，我们的 Kubernetes 便搭建完成了，如果你们在安装中出现问题，可以提出，大家共同讨论，希望大家以后多多支持编程网！

文章详情

二进制方式安装 Kubernetes1.18.3版本实现脚本

目录

一、Kubernetes 简介

1.Kubernetes 架构设计图

2.Kubernetes 常见组件介绍

二、Kubernetes 二进制方式安装

1.创建 CA 证书和密钥

2.安装 ETCD 组件

1）创建 ETCD 证书和密钥

2）生成证书和密钥

3）创建启动脚本

4）启动 ETCD

3.安装 Flannel 网络插件

1）创建 Flannel 证书和密钥

2）生成证书和密钥

3）编写启动脚本

4）启动并验证

4.安装 Docker 服务

1）创建启动脚本

2）启动 Docker

5.安装 Kubectl 服务

1）创建 Admin 证书和密钥

2）生成证书和密钥

3）创建 Kubeconfig 文件

4）创建 Kubectl 配置文件，并配置命令补全工具

三、安装 Kubenetes 相关组件

1.安装 Kube-APIServer 组件

1）创建 Kubernetes 证书和密钥

2）生成证书和密钥

3）配置 Kube-APIServer 审计

4）配置 Metrics-Server

5）创建启动脚本

6）启动 Kube-APIServer 并验证

2.安装 Controller Manager 组件

1）创建 Controller Manager 证书和密钥

2）生成证书和密钥

3）创建 Kubeconfig 文件

4）创建启动脚本

5）启动并验证

3.安装 Kube-Scheduler 组件

1）创建 Kube-Scheduler 证书和密钥

2）生成证书和密钥

3）创建 Kubeconfig 文件

4）创建 Kube-Scheduler 配置文件

5）创建启动脚本

6）启动并验证

4.安装 Kubelet 组件

1）创建 Kubelet 启动脚本

2）启动并验证

3）Approve CSR 请求

5）Kubelet API 接口配置

5.安装 Kube-Proxy 组件

1）创建 Kube-Proxy 证书和密钥

2）生成证书和密钥

3）创建 Kubeconfig 文件

4）创建 Kube-Proxy 配置文件

5）启动并验证

6.安装 CoreDNS 插件

1）修改 Coredns 配置

2）创建 Coredns 并启动

3）验证

7.安装 Dashboard 仪表盘

1）创建证书

2）修改 Dashboard 配置

3）验证

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