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官网导读
支持最好的平台：GNU/Linux
依赖的软件：
Java™ must be installed. Recommended Java versions are described at HadoopJavaVersions.Hadoop基于Java开发，Java的移动性好
ssh must be installed and sshd must be running to use the Hadoop scripts that manage remote Hadoop daemons.
部署模式：
Local (Standalone) Mode 单机模式，主要用于debug
Pseudo-Distributed Mode 伪分布式，单节点多角色
Fully-Distributed Mode 完全分布式，多节点多角色
基础设施
操作系统、环境、网络、必须软件
设置IP及主机名
关闭防火墙&selinux
设置hosts映射
时间同步
安装jdk
设置SSH免秘钥
设置IP及主机名
可以正常联网查看IP
[root@localhost ~]# ifconfigens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.118 netmask 255.255.255.0 broadcast 192.168.0.255 inet6 fe80::3db1:f589:4820:5457 prefixlen 64 scopeid 0x20<link> ether 00:0c:29:18:10:17 txqueuelen 1000 (Ethernet) RX packets 462062 bytes 670399544 (639.3 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 166351 bytes 11096211 (10.5 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 84 bytes 13940 (13.6 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 84 bytes 13940 (13.6 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether 52:54:00:5a:69:e1 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0// 配置DEVICE=eth0#HWADDR=00:0C:29:42:15:C2TYPE=EthernetONBOOT=yesNM_TROLLED=yesBOOTPROTO=staticIPADDR=192.168.150.11NETMASK=255.255.255.0GATEWAY=192.168.150.2DNS1=223.5.5.5DNS2=114.114.114.114修改配置文件设置主机名
[root@localhost ~]# vi /etc/sysconfig/network// 设置主机名并保存退出HOSTNAME=node01关闭防火墙&selinux
//关闭防火墙[root@localhost ~]# systemctl stop firewalld//关闭开机启动防火墙[root@localhost ~]# systemctl disable firewalld.serviceRemoved symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.[root@localhost ~]# [root@localhost ~]# vi /etc/selinux/config//将配置文件中的SELINUX设置为disabledSELINUX=disabled设置hosts映射
增加映射关系，因为在现在搭建环境的时候，一般会做解耦，不会再软件配置文件中写ip地址，主要使用主机名，就和dns解析一样，避免ip改变时要修改很多配置文件
[root@localhost ~]# vi /etc/hosts// 增加映射关系192.168.0.118 node01192.168.0.119 node02时间同步
所有节点时间需同步一致，不然未来做心跳的时候会有问题
[root@localhost ~]# dateFri Dec 30 22:23:45 CST 2022// 安装ntp[root@localhost ~]# yum install ntp -yLoaded plugins: fastestmirror, langpacksLoading mirror speeds from cached hostfile * base: mirrors.163.com * extras: mirrors.163.com * updates: mirrors.163.comPackage ntp-4.2.6p5-29.el7.centos.2.x86_64 already installed and latest versionNothing to do[root@localhost ~]# vi /etc/ntp.conf// 增加配置server ntp1.aliyun.com// 启动ntpd[root@localhost ~]# systemctl start ntpd.service// 配置开机启动ntpd[root@localhost ~]# systemctl enable ntpd.serviceCreated symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.[root@localhost ~]#安装jdk
设置环境变量的时候要记得设置两次，一次在安装jdk的时候设置，一次在搭建Hadoop的时候设置
去官网下载jdk，最好是rpm包，然后上传到服务器节点中（使用jdk压缩包解压安装需要做很多其他的配置）
这里使用过windows下载，通过scp命令上传到118节点中
F:\workspace\demo>scp C:\Users\43866\Downloads\jdk-8u351-linux-x64.rpm root@192.168.0.118:/usr/jdkroot@192.168.0.118's password: jdk-8u351-linux-aarch74.rpm 100% 59MB 70.1MB/s 00:00 F:\workspace\demo>在118节点中使用命令安装jdk
[root@node01 jdk]# rpm -i jdk-8u351-linux-x64.rpm warning: jdk-8u351-linux-x64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEYUnpacking JAR files... tools.jar... plugin.jar... javaws.jar... deploy.jar... rt.jar... jsse.jar... charsets.jar... localedata.jar...[root@node01 jdk]#设置JAVA_HOME环境变量
[root@node01 default]# vi /etc/profile// 追加环境变量并保存文件export JAVA_HOME=/usr/java/defaultexport PATH=$PATH:$JAVA_HOME/bin设置SSH免秘钥
想要使用Hadoop脚本就必须设置ssh免密
检查是否已设置ssh免密
[root@node01 default]# ssh localhostThe authenticity of host 'localhost (::1)' can't be established.ECDSA key fingerprint is SHA256:rDsunaro1f5LyKkEeNohXfDD9oEglNXtviD/JZtA1dw.ECDSA key fingerprint is MD5:51:38:8d:fc:e4:d2:c7:ce:66:09:c8:f2:e6:9e:a7:f2.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added 'localhost' (ECDSA) to the list of known hosts.root@localhost's password:通过ssh localhost命令检查发现需要输入密码，说明还未设置ssh免密，而且还可以自动生成.ssh文件，这个文件要创建的话比较麻烦
生成秘钥和公钥
如果118节点想免密登录到118节点（自己）：
118节点就要生成公钥和秘钥，且将公钥放到 ~/.ssh/authorized_keys中
[root@node01 .ssh]# ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsaGenerating public/private dsa key pair.Your identification has been saved in /root/.ssh/id_dsa.Your public key has been saved in /root/.ssh/id_dsa.pub.The key fingerprint is:SHA256:GHhKB7GeoYYlNPWJpCZ+VoABUyIgDbdYrjjyAdgui1k root@node01The key's randomart image is:+---[DSA 1024]----+|@BB+o. ||=X=.++. ||*o=.=++ ||=B +.* o ||B.Eo+ . S ||oOo. ||+ . || || |+----[SHA256]-----+[root@node01 .ssh]# cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys[root@node01 .ssh]# [root@node01 .ssh]# ssh 192.168.0.118Last login: Sat Dec 31 13:52:49 2022 from 192.168.0.117[root@node01 ~]#结论
119节点包含了118节点的公钥，118就可以免密登录
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