Kubernetes command、args的区别-CFANZ编程社区

command、args的区别

# command、args两项实现覆盖Dockerfile中ENTRYPOINT的功能,具体的command命令代替ENTRYPOINT的命令行，args代表集体的参数。

# 以下是使用场景
1. 如果command和args均没有指定，那么则使用Dockerfile的配置。

2. 如果command没有指定，但指定了args，那么Dockerfile中配置的ENTRYPOINT的命令行会被执行，并且将args中填写的参数追加到ENTRYPOINT中。

3. 如果command指定了，但args没有写，那么Dockerfile默认的配置会被忽略，执行输入的command（不带任何参数，当然command中可自带参数）。

4. 如果command和args都指定了，那么Dockerfile的配置被忽略，执行command并追加上args参数。

[root@Master ~]# vim pod-busybox-command-args.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: pod-busybox-command-args
  labels:
    name: pod-busybox-command-args
spec:
  containers:
  - name: busybox
    image: busybox
    imagePullPolicy: IfNotPresent
    command: ["/bin/sh","-c","sleep 3600"]

[root@Master ~]# kubectl create -f pod-busybox-command-args.yaml 
pod/pod-busybox-command-args created
[root@Master ~]# kubectl get pods
NAME                      READY   STATUS    RESTARTS   AGE
pod-busybox-command-args   1/1     Running   0          4s

删除pod
[root@Master ~]# kubectl delete pod pod-busybox-command-args
pod "pod-busybox-command-args" deleted

修改方式一：
[root@Master ~]# vim pod-busybox-command-args.yaml 
    command: ["/bin/sh","-c","sleep 3600"]
    修改为
    command: ["/bin/sh"]
    args: ["-c","sleep 3600"]
    
[root@Master ~]# kubectl create -f pod-busybox-command-args.yaml 
pod/pod-busybox-command-args created
[root@Master ~]# kubectl get pods
NAME                      READY   STATUS    RESTARTS   AGE
pod-busybox-command-args   1/1     Running   0          4s
删除pod
[root@Master ~]# kubectl delete pod pod-busybox-command-args
pod "pod-busybox-command-args" deleted

修改方式二：
[root@Master ~]# vim pod-busybox-command-args.yaml 
    command: ["/bin/sh","-c","sleep 3600"]
修改为
    args:
    - /bin/sh
    - -c
    - sleep 3600
    
[root@Master ~]# kubectl create -f pod-busybox-command-args.yaml 
pod/pod-busybox-command-args created
[root@Master ~]# kubectl get pods
NAME                       READY   STATUS    RESTARTS   AGE
pod-busybox-command-args   1/1     Running   0          4s
删除pod
[root@Master ~]# kubectl delete pod pod-busybox-command-args
pod "pod-busybox-command-args" deleted