使用k8tz解决pod内的时区问题(坑的解决)

#官方提供的helm部署方式
helm repo add k8tz https://k8tz.github.io/k8tz/
helm install k8tz k8tz/k8tz --set timezone=Asia/Beijing

###除了helm安装官方还提供了其它方式，可以查看官方文档。

#查看 Pod 状态、Mutatingwebhookconfigurations、Service 等资源是否正常：
[root@master ~]# kubectl get mutatingwebhookconfigurations.admissionregistration.k8s.io
NAME        WEBHOOKS   AGE
k8zt-k8tz   1          2m
[root@master ~]# kubectl get all -n k8tz
NAME                            READY   STATUS    RESTARTS   AGE
pod/k8zt-k8tz-7559df766-zlxdz   1/1     Running   0          2m36s

NAME           TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
service/k8zt   ClusterIP   10.68.247.230   <none>        443/TCP   2m36s

NAME                        READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/k8zt-k8tz   1/1     1            1           2m36s

NAME                                  DESIRED   CURRENT   READY   AGE
replicaset.apps/k8zt-k8tz-7559df766   1         1         1       2m36s

#annotations主要有三个键值对
#k8tz.io/inject: true/false  是否禁止注入,当注入时区操作和禁止注入同时存在时，注入时区的优先级会高于禁止注入
#k8tz.io/timezone： Asia/Beijing  注入时区，时区选择根据自己需求
#k8tz.io/strategy: hostpath/initcontainer 提供了挂载本地文件和init容器两种方式

#测试
#部署一个测试ng
[root@master k8tz]# cat ng1.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:alpine
        ports:
        - containerPort: 80
[root@master k8tz]# date
Mon Oct 10 15:02:41 CST 2022
[root@master k8tz]# kubectl exec -it nginx-7fb7fd49b4-xm5wr sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
/ # date
Mon Oct 10 07:02:54 UTC 2022

##添加注释  k8tz.io/timezone: Asia/Beijing
[root@master k8tz]# cat ng2.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx2
  annotations:
     k8tz.io/timezone: Asia/Beijing
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx2
  template:
    metadata:
      labels:
        app: nginx2
    spec:
      containers:
      - name: nginx2
        image: nginx:alpine
        ports:
        - containerPort: 80


[root@master k8tz]# date
Mon Oct 10 15:06:14 CST 2022
[root@master k8tz]# kubectl exec -it nginx2-67b5db4568-zhps7 sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
/ # date
Mon Oct 10 07:06:25 UTC 2022

#查看nginx2的启动流程，可以看到先启动了一个k8tz的init容器
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  111s  default-scheduler  Successfully assigned default/nginx2-67b5db4568-zhps7 to 192.168.130.176
  Normal  Pulled     111s  kubelet            Container image "quay.io/k8tz/k8tz:0.8.0" already present on machine
  Normal  Created    111s  kubelet            Created container k8tz
  Normal  Started    111s  kubelet            Started container k8tz
  Normal  Pulled     110s  kubelet            Container image "nginx:alpine" already present on machine
  Normal  Created    110s  kubelet            Created container nginx2
  Normal  Started    110s  kubelet            Started container nginx2
##annotations 也可以在命名空间中指定，并影响在命名空间中创建的所有 pod。下面创建一个 test namespace 用于测试：
#因为k8tz默认会对新创建的pod更改时区所以这里测试用了shanghai和之前的beijing做区分
[root@master ~]# kubectl create ns test
[root@master ~]# kubectl annotate ns test k8tz.io/strategy=hostPath
namespace/test annotated
[root@master ~]# kubectl annotate ns test k8tz.io/timezone=Asia/Shanghai
namespace/test annotated

#可以看到新创建的nginx2的时区为shanghai
Name:         nginx2-67b5db4568-9zjpb
Namespace:    test
Priority:     0
Node:         192.168.130.176/192.168.130.176
Start Time:   Mon, 10 Oct 2022 15:26:35 +0800
Labels:       app=nginx2
              pod-template-hash=67b5db4568
Annotations:  k8tz.io/injected: true
              k8tz.io/timezone: Asia/Shanghai
Status:       Running

#有时候会因为网络问题导致安装失败
Error: failed to download "k8tz/k8tz" (hint: running `helm repo update` may help)

#可以先helm拉到本地再安装，多尝试几次安装也可
[root@master root]# helm install k8zt --set timezone=Asia/Beijing  k8tz-0.8.0.tgz
NAME: k8zt
LAST DEPLOYED: Mon Oct 10 14:46:55 2022
NAMESPACE: default
STATUS: deployed
REVISION: 1