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链接：https://www.orchome.com/1254
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