k8spod的介绍

yaml介绍

apiVersion: v1   APIserver 的版本
kind: Pod   资源类型
metadata:  元数据定义
        name: pod-demo  元数据资源名字
        labels:   定义标签
             app: myapp     两个标签
             tier: frontend
spec:   容器期望状态定义
        containers:  pod 定义
        - name: myapp   pod名称
          image: ikubernetes/myapp:v1  镜像的版本及路径
        - name: busyboxa  pod 名称
          image: busybox:latest   镜像名称
          imagePullPolicy: IfNotPresent  #获取镜像的方式
          ports:   端口暴露定义
          - name: http   pod 的容器name
          - containerPort: 80  容器端口
          command:    修改默认运行的命令
          - "/bin/sh"
          -  "-c"
          -  "sleep 36000"

　　pod定义帮助

[root@master manifests]# kubectl explain pods.spec.container
KIND:     Pod
VERSION:  v1

RESOURCE: containers <[]Object>

DESCRIPTION:
     List of containers belonging to the pod. Containers cannot currently be
     added or removed. There must be at least one container in a Pod. Cannot be
     updated.

     A single application container that you want to run within a pod.

FIELDS:
   args	<[]string>
     Arguments to the entrypoint. The docker image's CMD is used if this is not
     provided. Variable references $(VAR_NAME) are expanded using the
     container's environment. If a variable cannot be resolved, the reference in
     the input string will be unchanged. The $(VAR_NAME) syntax can be escaped
     with a double $$, ie: $$(VAR_NAME). Escaped references will never be
     expanded, regardless of whether the variable exists or not. Cannot be
     updated. More info:
     https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#running-a-command-in-a-shell

   command	<[]string>
     Entrypoint array. Not executed within a shell. The docker image's
     ENTRYPOINT is used if this is not provided. Variable references $(VAR_NAME)
     are expanded using the container's environment. If a variable cannot be
     resolved, the reference in the input string will be unchanged. The
     $(VAR_NAME) syntax can be escaped with a double $$, ie: $$(VAR_NAME).
     Escaped references will never be expanded, regardless of whether the
     variable exists or not. Cannot be updated. More info:
     https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#running-a-command-in-a-shell

   env	<[]Object>
     List of environment variables to set in the container. Cannot be updated.

   envFrom	<[]Object>
     List of sources to populate environment variables in the container. The
     keys defined within a source must be a C_IDENTIFIER. All invalid keys will
     be reported as an event when the container is starting. When a key exists
     in multiple sources, the value associated with the last source will take
     precedence. Values defined by an Env with a duplicate key will take
     precedence. Cannot be updated.

   image	   镜像仓库的镜像
     Docker image name. More info:
     https://kubernetes.io/docs/concepts/containers/images This field is
     optional to allow higher level config management to default or override
     container images in workload controllers like Deployments and StatefulSets.

   imagePullPolicy	  获取镜像的方法 镜像标签是latest默认获取的方式Always表示总是去下载，Never表示本地有就用，本地没有也不去仓库下载，IfNotPresent本地有就用本地的，本地没有就去仓库下载
     Image pull policy. One of Always, Never, IfNotPresent. Defaults to Always
     if :latest tag is specified, or IfNotPresent otherwise. Cannot be updated.
     More info:
     https://kubernetes.io/docs/concepts/containers/images#updating-images

   lifecycle