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Kubernetes应用1

时间：2022-11-11 17:32:01浏览次数：48  
标签：name Kubernetes -- root value wordpress 应用 mydb

1、传递环境变量创建mysql
[root@master-101 ~]#kubectl create service clusterip mydb --tcp=3306:3306 --dry-run=client -o yaml
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: mydb
  name: mydb
spec:
  ports:
  - name: 3306-3306
    port: 3306
    protocol: TCP
    targetPort: 3306
  selector:
    app: mydb
  type: ClusterIP
status:
  loadBalancer: {}
[root@master-101 ~]#kubectl create service clusterip mydb --tcp=3306:3306 --dry-run=client -o yaml > service-mydb.yaml
[root@master-101 ~]#vim service-mydb.yaml 

apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: mydb
  name: mydb
spec:
  ports:
  - name: 3306-3306
    port: 3306
    protocol: TCP
    targetPort: 3306
  selector:
    app: mydb
  type: ClusterIP
status:
  loadBalancer: {}
[root@master-101 ~]#kubectl apply -f service-mydb.yaml 
service/mydb created

[root@master-101 ~]#kubectl run mydb --image=mysql:8.0 --restart=Never --port=3306 --dry-run=client -o yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: mydb
  name: mydb
spec:
  containers:
  - image: mysql:8.0
    name: mydb
    ports:
    - containerPort: 3306
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}
[root@master-101 ~]#kubectl run mydb --image=mysql:8.0 --restart=Never --port=3306 --dry-run=client -o yaml > mydb.yaml

[root@master-101 ~]#vim mydb.yaml 
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: mydb
  name: mydb
spec:
  containers:
  - image: mysql:8.0
    name: mydb
    env:
    - name: MYSQL_RANDOM_ROOT_PASSWORD
      value: "1"
    - name: MYSQL_DATABASE
      value: "wpdb"
    - name: MYSQL_USER
      value: "wordpress"
    - name: MYSQL_PASSWORD
      value: "123456                  #注意：数字要用引号引起来转成字符串

[root@master-101 ~]#kubectl apply -f mydb.yaml 
pod/mydb created
2、传递环境变量创建wordpress
[root@master-101 ~]#kubectl create service nodeport wordpress --tcp=80:80 --dry-run=client -o yaml
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: wordpress
  name: wordpress
spec:
  ports:
  - name: 80-80
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: wordpress
  type: NodePort
status:
  loadBalancer: {}
[root@master-101 ~]#kubectl create service nodeport wordpress --tcp=80:80 --dry-run=client -o yaml > service-wordpress.yaml

[root@master-101 ~]#vim service-wordpress.yaml
apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: wordpress
  name: wordpress
spec:
  ports:
  - name: 80-80
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: wordpress
  type: NodePort
status:
  loadBalancer: {}
  
[root@master-101 ~]#kubectl apply -f service-wordpress.yaml 
service/wordpress created

[root@master-101 ~]#kubectl run wordpress --image=wordpress:6.1-apache --restart=Never --port=80 --dry-run=client -o yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: wordpress
  name: wordpress
spec:
  containers:
  - image: wordpress:6.1-apache
    name: wordpress
    ports:
    - containerPort: 80
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}
[root@master-101 ~]#kubectl run wordpress --image=wordpress:6.1-apache --restart=Never --port=80 --dry-run=client -o yaml > wordpress.yaml

[root@master-101 ~]#vim wordpress.yaml 
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    app: wordpress
  name: wordpress
  namespace: demo
spec:
  containers:
  - image: wordpress:6.1-apache
    env:
    - name: WORDPRESS_DB_HOST
      value: wordpress
    - name: WORDPRESS_DB_NAME
      value: wordpress
    - name: WORDPRESS_DB_USER
      value: wordpress
    - name: WORDPRESS_DB_PASSWORD
      value: "123456"                   #注意：变量数字需加上引号变为字符串
    name: wordpress
    ports:
    - containerPort: 80
  dnsPolicy: ClusterFirst
  restartPolicy: Never
                  
[root@master-101 ~]#kubectl apply -f wordpress.yaml 
pod/wordpress created
3、为mysql添加探针
#为mysql添加探针：
[root@k8s-master01 ~]#vim mydb-liveness.yaml
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: mydb
  name: mydb
spec:
  containers:
  - image: mysql:8.0
    name: mydb
    env:
#    - name: MYSQL_RANDOM_ROOT_PASSWORD
    - name: MYSQL_ROOT_PASSWORD
      value: "123456"
    - name: MYSQL_DATABASE
      value: "wpdb"
    - name: MYSQL_USER
      value: "wordpress"
    - name: MYSQL_PASSWORD
      value: "123456"
    ports:
    - name: mysqlport
      containerPort: 3306
    startupProbe:
      exec:
        command: ['/bin/sh', '-c', '[ "$(mysqladmin -uwordpress -p123456 ping)" == "mysqld is alive" ]']
      initialDelaySeconds: 30
      timeoutSeconds: 1
      periodSeconds: 5
    livenessProbe:
      tcpSocket:
        port: mysqlport
      periodSeconds: 5
      initialDelaySeconds: 5
    readinessProbe:
      tcpSocket:
        port: mysqlport
      initialDelaySeconds: 15
      timeoutSeconds: 2
      periodSeconds: 5
      failureThreshold: 3


[root@k8s-master01 ~]#kubectl describe pod mydb
......
    Restart Count:  1
    Liveness:       tcp-socket :mysqlport delay=5s timeout=1s period=5s #success=1 #failure=3
    Readiness:      tcp-socket :mysqlport delay=15s timeout=2s period=5s #success=1 #failure=3
    Startup:        exec [/bin/sh -c [ "$(mysqladmin -uwordpress -p123456 ping)" == "mysqld is alive" ]] delay=30s timeout=1s period=5s #success=1 #failure=3
......
4、为wordpress添加探针
[root@k8s-master01 ~]#vim wordpress-liveness.yaml 
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    app: wordpress
  name: wordpress
spec:
  containers:
  - image: registry.cn-hangzhou.aliyuncs.com/gtsre/wordpress:6.0.2
    name: wordpress
    env:
    - name: WORDPRESS_DB_HOST
      value: "mydb"
    - name: WORDPRESS_DB_NAME
      value: "wpdb"
    - name: WORDPRESS_DB_USER
      value: "wordpress"
    - name: WORDPRESS_DB_PASSWORD
      value: "123456"
    ports:
    - name: http
      containerPort: 80
    startupProbe:
      tcpSocket:
        port: http
      initialDelaySeconds: 30
      failureThreshold: 3
      periodSeconds: 3
    livenessProbe:
      httpGet:
        host: 127.0.0.1
        path: /
        port: 80
        scheme: HTTP
      initialDelaySeconds: 40
      periodSeconds: 3
      timeoutSeconds: 5
      successThreshold: 1
      failureThreshold: 3
    readinessProbe:
      httpGet:
        host: 127.0.0.1
        path: /
        port: http
        scheme: HTTP
      initialDelaySeconds: 40
      periodSeconds: 3
      timeoutSeconds: 5
      successThreshold: 1
      failureThreshold: 3
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}

[root@k8s-master01 ~]#kubectl describe pod wordpress
......
    Ready:          True
    Restart Count:  0
    Liveness:       http-get http://127.0.0.1:80/ delay=40s timeout=5s period=3s #success=1 #failure=3
    Readiness:      http-get http://127.0.0.1:http/ delay=40s timeout=5s period=3s #success=1 #failure=3
    Startup:        tcp-socket :http delay=30s timeout=1s period=3s #success=1 #failure=3
......
5、资源限制
[root@k8s-master01 ~]#vim mydb-resource.yaml 
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: mydb
  name: mydb
spec:
  containers:
  - image: mysql:8.0
    name: mydb
    resources:
      requests:                    #最低要求（下限）
        memory: "512Mi"            
        cpu: "1"
      limits:                      #最高限制（上限）
        memory: "512Mi"
        cpu: "1"
    env:
#    - name: MYSQL_RANDOM_ROOT_PASSWORD
    - name: MYSQL_ROOT_PASSWORD
      value: "123456"
    - name: MYSQL_DATABASE
      value: "wpdb"
    - name: MYSQL_USER
      value: "wordpress"
    - name: MYSQL_PASSWORD
      value: "123456"
    ports:
    - name: mysqlport
      containerPort: 3306
    startupProbe:
      exec:
        command: ['/bin/sh', '-c', '[ "$(mysqladmin -uwordpress -p123456 ping)" == "mysqld is alive" ]']
      initialDelaySeconds: 30
      timeoutSeconds: 1
      periodSeconds: 5
    livenessProbe:
      tcpSocket:
        port: mysqlport
      periodSeconds: 5
      initialDelaySeconds: 5
    readinessProbe:
      tcpSocket:
        port: mysqlport
      initialDelaySeconds: 15
      timeoutSeconds: 2
      periodSeconds: 5
      failureThreshold: 3
[root@k8s-master01 ~]#vim wordpress-resource.yaml
apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    app: wordpress
  name: wordpress
spec:
  containers:
  - image: registry.cn-hangzhou.aliyuncs.com/gtsre/wordpress:6.0.2
    name: wordpress
    resources:
      requests:                           #下限
        memory: "512Mi"
        cpu: "1"
      limits:                             #上限
        memory: "512Mi"
        cpu: "1"
    env:
    - name: WORDPRESS_DB_HOST
      value: "mydb"
    - name: WORDPRESS_DB_NAME
      value: "wpdb"
    - name: WORDPRESS_DB_USER
      value: "wordpress"
    - name: WORDPRESS_DB_PASSWORD
      value: "123456"
    ports:
    - name: http
      containerPort: 80
    startupProbe:
      tcpSocket:
        port: http
      initialDelaySeconds: 30
      failureThreshold: 3
      periodSeconds: 3
    livenessProbe:
      httpGet:
        host: 127.0.0.1
        path: /
        port: 80
        scheme: HTTP
      initialDelaySeconds: 40
      periodSeconds: 3
      timeoutSeconds: 5
      successThreshold: 1
      failureThreshold: 3
    readinessProbe:
      httpGet:
        host: 127.0.0.1
        path: /
        port: http
        scheme: HTTP
      initialDelaySeconds: 40
      periodSeconds: 3
      timeoutSeconds: 5
      successThreshold: 1
      failureThreshold: 3
    resources: {}
  dnsPolicy: ClusterFirst
  restartPolicy: Never
status: {}


标签：name,Kubernetes,--,root,value,wordpress,应用,mydb
From： https://blog.51cto.com/dayu/5845224

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