常用K8S命令

Pod

kubectl --kubeconfig=kubeconfig.yaml get pods
kubectl --kubeconfig=kubeconfig.yaml describe pod hello-api
kubectl --kubeconfig=kubeconfig.yaml edit pod hello-api

Ingress

kubectl --kubeconfig=kubeconfig.yaml create -f hello-api-ingress.yaml
kubectl --kubeconfig=kubeconfig.yaml get ingresses
kubectl --kubeconfig=kubeconfig.yaml describe ingress hello-api
kubectl --kubeconfig=kubeconfig.yaml edit ingresses hello-api

SVC

kubectl --kubeconfig=kubeconfig.yaml create -f hello-api-svc.yaml
kubectl --kubeconfig=kubeconfig.yaml get svc
kubectl --kubeconfig=kubeconfig.yaml describe svc hello-api
kubectl --kubeconfig=kubeconfig.yaml edit hello-api

Stop pods

kubectl scale deployment <deployment name> -n <namespace> --replicas=0

Start pods

kubectl scale deployment <deployment name> -n <namespace> --replicas=2

Restart pods

kubectl rollout restart deployment  -n <namespace>

更新任务状态

kubectl patch cronjobs vaqa-confluence-job -p '{"spec" : {"suspend" : true }}'

滚动升级

kubectl set image deployment <deployment name> <container name>=<image full name>:<new tag> kubectl patch deployment <deployment name> -p '{"spec": {"template": {"spec": {"containers": [{"name":"containername","image": "yourimagename:tag"}]}}}}'

查看滚动升级过程

kubectl rollout status deployment <deployment name>

查看历史升级版本

kubectl rollout history deployment <deployment name>

回滚到deployment指定的版本

kubectl rollout undo deployment <deployment name> --to-revision=<revision value>

CronJob

kubectl --kubeconfig=kubeconfig.yaml apply -f cron-job.yaml

kubectl --kubeconfig=kubeconfig.yaml get cronjob hello-job
NAME                  SCHEDULE    SUSPEND   ACTIVE   LAST SCHEDULE   AGE
hello-job   * * * * *   False     0        <none>          14s
kubectl --kubeconfig=kubeconfig.yaml get jobs --watch
NAME                           COMPLETIONS   DURATION   AGE
hello-job-28160783   0/1                      0s
hello-job-28160783   0/1           3s         3s
hello-job-28160783   0/1           0s         3s
hello-job-28160783   1/1           5s         8s
kubectl --kubeconfig=kubeconfig.yaml get pods
NAME                                 READY   STATUS      RESTARTS   AGE
hello-64cdb46cc5-cjjf7     1/1     Running     0          80d
hello-job-28160783-lbwwn   0/1     Completed   0          41s
kubectl --kubeconfig=kubeconfig.yaml logs pod/hello-job-28160783-lbwwn
Tue Jul 18 02:23:05 UTC 2023
hello cron job

kubectl --kubeconfig=kubeconfig.yaml edit cronjob/hello-job
cronjob.batch/hello-job edited

kubectl --kubeconfig=kubeconfig.yaml get pods
NAME                                 READY   STATUS      RESTARTS   AGE
hello-64cdb46cc5-cjjf7     1/1     Running     0          80d
hello-job-28160783-lbwwn   0/1     Completed   0          2m
hello-job-28160784-55zqr   0/1     Completed   0          57s

-- 可通过以下命令查看job创建不成功的原因，查看输出中有个events
kubectl --kubeconfig=kubeconfig.yaml describe job hello-job-28160762

apiVersion: batch/v1
kind: CronJob
metadata:
  name: hello-job
spec:
  schedule: "* * * * *"
  jobTemplate:
    spec:
      backoffLimit: 2
      template:
        spec:
          containers:
          - command:
            - /bin/sh
            - -c
            - date; resp=$(curl -X GET $URL); echo $resp;
            env:
            - name: URL
              value: http://icodesoft.com/testcronjob
            image: byrnedo/alpine-curl
            imagePullPolicy: IfNotPresent
            name: curl
            resources:
              limits:
                cpu: 250m
                memory: 512Mi
              requests:
                cpu: 100m
                memory: 256Mi
          restartPolicy: Never
          schedulerName: default-scheduler
          terminationGracePeriodSeconds: 30
  startingDeadlineSeconds: 100
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 1
  suspend: false