kubectl api-resources

Deployment

deployment-mysql.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
  namespace: luffy
spec:
  replicas: 1	#指定Pod副本数
  selector:		#指定Pod的选择器
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:	#给Pod打label,必须和上方的matchLabels匹配
        app: mysql
        from: luffy
    spec:
      containers:
      - name: mysql
        image: mysql:5.7
        args:
        - --character-set-server=utf8mb4
        - --collation-server=utf8mb4_unicode_ci
        ports:
        - containerPort: 3306
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: eladmin-secret
              key: DB_PWD
        - name: MYSQL_DATABASE
          value: "eladmin"
        resources:
          requests:
            memory: 200Mi
            cpu: 50m
          limits:
            memory: 1Gi
            cpu: 500m
        readinessProbe:
          tcpSocket:
            port: 3306
          initialDelaySeconds: 5
          periodSeconds: 10
        livenessProbe:
          tcpSocket:
            port: 3306
          initialDelaySeconds: 15
          periodSeconds: 20
        volumeMounts:
        - name: mysql-data
          mountPath: /var/lib/mysql
      volumes: 
      - name: mysql-data
        hostPath: 
          path: /opt/mysql/
      nodeSelector:   # 使用节点选择器将Pod调度到指定label的节点
        mysql: "true"

deploy-eladmin-api.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: eladmin-api
  namespace: luffy
spec:
  replicas: 1	#指定Pod副本数
  selector:		#指定Pod的选择器
    matchLabels:
      app: eladmin-api
  template:
    metadata:
      labels:	#给Pod打label
        app: eladmin-api
    spec:
      imagePullSecrets:
      - name: registry-172-21-65-226
      containers:
      - name: eladmin-api
        image: 172.21.65.226:5000/eladmin/eladmin-api:v1
        imagePullPolicy: IfNotPresent
        env:
        - name: DB_HOST
          valueFrom:
            configMapKeyRef:
              name: eladmin
              key: DB_HOST
        - name: REDIS_HOST
          valueFrom:
            configMapKeyRef:
              name: eladmin
              key: REDIS_HOST
        - name: REDIS_PORT
          valueFrom:
            configMapKeyRef:
              name: eladmin
              key: REDIS_PORT
        - name: DB_USER
          valueFrom:
            secretKeyRef:
              name: eladmin-secret
              key: DB_USER
        - name: DB_PWD
          valueFrom:
            secretKeyRef:
              name: eladmin-secret
              key: DB_PWD
        ports:
        - containerPort: 8000
        resources:
          requests:
            memory: 200Mi
            cpu: 50m
          limits:
            memory: 4Gi
            cpu: 2
        livenessProbe:
          tcpSocket:
            port: 8000
          initialDelaySeconds: 20  # 容器启动后第一次执行探测是需要等待多少秒
          periodSeconds: 15 	# 执行探测的频率
          timeoutSeconds: 3		# 探测超时时间
        readinessProbe: 
          httpGet: 
            path: /auth/code
            port: 8000
            scheme: HTTP
          initialDelaySeconds: 20 
          timeoutSeconds: 3
          periodSeconds: 15

deployment-redis.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis
  namespace: luffy
spec:
  replicas: 1	#指定Pod副本数
  selector:		#指定Pod的选择器
    matchLabels:
      app: redis
  template:
    metadata:
      labels:	#给Pod打label,必须和上方的matchLabels匹配
        app: redis
    spec:
      containers:
      - name: redis
        image: redis:3.2
        ports:
        - containerPort: 6379
        resources:
          requests:
            memory: 100Mi
            cpu: 50m
          limits:
            memory: 1Gi
            cpu: 500m
        readinessProbe:
          tcpSocket:
            port: 6379
          initialDelaySeconds: 5
          periodSeconds: 10
        livenessProbe:
          tcpSocket:
            port: 6379
          initialDelaySeconds: 15
          periodSeconds: 20

创建Deployment

$ kubectl create -f deploy-eladmin-api.yaml

查看Deployment

# kubectl api-resources
$ kubectl -n luffy get deploy
NAME          READY   UP-TO-DATE   AVAILABLE   AGE
eladmin-api   1/1     1            1           6m41s
mysql         1/1     1            1           27m
redis         1/1     1            1           90s

  * `NAME` 列出了集群中 Deployments 的名称。
  * `READY`显示当前正在运行的副本数/期望的副本数。
  * `UP-TO-DATE`显示已更新以实现期望状态的副本数。
  * `AVAILABLE`显示应用程序可供用户使用的副本数。
  * `AGE` 显示应用程序运行的时间量。

# 查看pod
$ kubectl -n luffy get po -owide

# 查看replicaSet
$ kubectl -n luffy get rs

副本保障机制

controller实时检测pod状态，并保障副本数一直处于期望的值。

## 删除pod，观察pod状态变化
$ kubectl -n luffy delete pod eladmin-api-5bff94959d-hxz2r

# 观察pod
$ kubectl get pods -o wide

## 设置两个副本, 或者通过kubectl -n luffy edit deploy eladmin-api的方式，最好通过修改文件，然后apply的方式，这样yaml文件可以保持同步
$ kubectl -n luffy scale deploy eladmin-api --replicas=2
deployment.extensions/eladmin-api scaled

# 观察pod
$ kubectl get pods -o wide

服务更新

修改服务，重新打tag模拟服务更新。

更新方式：

# 1. 修改yaml文件，然后apply更新应用
kubectl -n luffy apply -f deploy-eladmin-api.yaml

# 2 直接在线更新
kubectl -n luffy edit deploy eladmin-api

# 3 命令更新
kubectl -n luffy set image deploy eladmin-api eladmin-api=172.21.65.226:5000/eladmin/eladmin-api:v2 --record

修改文件测试：

$ docker build . -t 172.21.65.226:5000/eladmin/eladmin-api:v2 -f Dockerfile
$ docker push 172.21.65.226:5000/eladmin/eladmin-api:v2