k8s 的容器command用法舉例

問題描述以及解決：

問題一 CrashLoopBackOff

如容器運行報如下錯誤：

 

 

且在describe和kubelet日志中沒有明確記錄原因，基本都是因為command命令不合法導致

如需要運行多條命令，使用;不要使用&&

如下示例：

          command: ["/bin/sh"]

          args: ["-c","/usr/local/bin/redis_start;while true;do echo hello;sleep 1;done"]

 

docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

k8s的command對應如上docker命令的[COMMAND] [ARG...]

1. 但在k8里這樣報錯,top必須得有個參數,錯誤寫法：

apiVersion: v1    
kind: Pod    
metadata:    
  name: centos  
  labels:    
    app: centos    
spec:    
  containers:    
  - name: mycentos  
    image: centos  
    imagePullPolicy: IfNotPresent  
    command: ["top",]  

報錯是:env找不到...

給top加上參數：

apiVersion: v1    
kind: Pod    
metadata:    
  name: centos  
  labels:    
    app: centos    
spec:    
  containers:    
  - name: mycentos  
    image: centos  
    imagePullPolicy: IfNotPresent  
    command: ["top","-b"]  

也可以這樣寫：

apiVersion: v1    
kind: Pod    
metadata:    
  name: centos  
  labels:    
    app: centos    
spec:    
  containers:    
  - name: mycentos  
    image: centos  
    imagePullPolicy: IfNotPresent  
    command: ["top"]  
    args: ["-b"]  

 

 

使用shell命令的寫法：

apiVersion: v1    
kind: Pod    
metadata:    
  name: centos  
  labels:    
    app: centos    
spec:    
  containers:    
  - name: mycentos  
    image: centos  
    imagePullPolicy: IfNotPresent  
    command: ["/bin/sh"]  
    args: ["-c","while true;do echo hello;sleep 1;done"]  

或者這樣：

apiVersion: v1      
kind: Pod      
metadata:      
  name: centos    
  labels:      
    app: centos      
spec:      
  containers:      
  - name: mycentos    
    image: centos    
    imagePullPolicy: IfNotPresent    
    command: ["/bin/sh","-c","while true;do echo hello;sleep 1;done"]