17.Kubernetes深入Pod

本节将对kubernetes如何发布和管理应用进行说明和示例，主要包括Pod和容器的使用、Pod的控制和调度、应用配置管理等内容。

1.Pod定义详解

yaml格式的Pod定义文件的完整内容：

apiVersion: v1
kind: Pod
metadata:
  name: string
  namespace: string
  labels:
    - name: string annotations: - name: string spec: containers: - name: string image: string imagePullPolicy: [Always | Never | IfNotPresent] command: [string] args: [string] workingDir: string volumeMounts: - name: string mountPath: string readOnly: boolean ports: - name: string containerPort: int hostPort: ing protocol: string env: - name: string value: string resources: limits: cpu: string memory: string requests: cpu: string memory: string livenessProbe: exec: command: [string] httpGet: path: string port: number host: string scheme: string httpHeaders: - name: string value: string tcpSocket: port: number initialDelaySeconds: 0 timeoutSeconds: 0 periodSeconds: 0 successThreshold: 0 failureThreshold: 0 securityContext: privileged: false restartPolicy: [Always | Never | OnFailure] nodeSelector: object imagePullSecrets: - name: string hostNetwork: false volumes: - name: string emptyDir: {} hostPath: path: string secret: secretName: string items: - key: string path: string configMap: name: string items: - key: string path: string 

2. Pod的基本用法

Pod可用由1个或多个容器组合而成，例如名为frontend的Pod只由一个容器组成：

apiVersion: v1
kind: Pod
metadata:
  name: frontend
  labels:
    name: frontend
spec:
  containers:
  - name: frontend
    image: kubeguide/guestbook-php-frontend
    env:
    - name: GET_HOSTS_FROM value: env ports: - containerPort: 80 

这个Pod启动后，将启动1个Docker容器另一种场景是，当两个容器为紧耦合关系，应将两个容器打包为一个Pod，如下：

配置文件frontend-localredis-pod.yaml如下：

apiVersion: v1
kind: Pod
metadata:
  name: redis-php
  labels:
    name: redis-php
spec:
  containers:
  - name: frontend
    image: kubeguide/guestbook-frontend:localredis
    ports:
    - containerPort: 80 - name: redis image: kubeguide/redis-master ports: - containerPort: 6379 

运行命令创建Pod：

kubectl create -f frontend-localredis-pod.yaml
kubectl get pods
NAME |Ready |status |Restarts |Age
redis-php |2/2 |Running |0 |10m 

可以看到Ready信息为2/2，表示Pod中有两个容器在运行

查看这个Pod的详细信息，可以看到两个容器的定义及创建过程(Event事件信息)

#kubectl describe pod redis-php

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转载于:https://www.cnblogs.com/linux20190409/p/10976300.html