Kubernetes 部署常见应用

k8s 安装：https://www.cnblogs.com/jhxxb/p/14321352.html

yaml 文件说明：https://kubernetes.io/zh/docs/concepts/overview/working-with-objects/kubernetes-objects

MySQL

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-mysql
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 10.74.2.71
    path: "/nfs/mysql"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nfs-mysql
  namespace: default
spec:
  accessModes:
    - ReadWriteMany
  storageClassName: ""
  resources:
    requests:
      storage: 5Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-deployment
spec:
  selector:
    matchLabels:
      app: mysql-label
  replicas: 1
  template:
    metadata:
      labels:
        app: mysql-label
    spec:
      containers:
      - name: mysql
        image: mysql:latest
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: root
        - name: MYSQL_ROOT_HOST
          value: '%'
        - name: TZ
          value: Asia/Shanghai
        ports:
        - containerPort: 3306
        volumeMounts:
          - name: mysql-data
            mountPath : /var/lib/mysql
      volumes:
        - name: mysql-data
          persistentVolumeClaim:
            claimName: nfs-mysql
---
apiVersion: v1
kind: Service
metadata:
  name: mysql-service
spec:
  selector:
    app: mysql-label
  type: NodePort
  ports:
  - port: 3306
    targetPort: 3306

sudo mkdir /nfs/mysql

kubectl apply -f mysql.yaml

Oracle

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-oracle
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 10.74.2.71
    path: "/nfs/oracle"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nfs-oracle
  namespace: default
spec:
  accessModes:
    - ReadWriteMany
  storageClassName: ""
  resources:
    requests:
      storage: 10Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: oracle-deployment
spec:
  selector:
    matchLabels:
      app: oracle-label
  replicas: 1
  template:
    metadata:
      labels:
        app: oracle-label
    spec:
      containers:
      - name: oracle-11g
        image: loliconneko/oracle-ee-11g:latest
        env:
        - name: WEB_CONSOLE
          value: 'false'
        - name: DBCA_TOTAL_MEMORY
          value: '4096'
        ports:
        - containerPort: 1521
        volumeMounts:
          - name: oracle-data
            mountPath : /u01/app/oracle
      volumes:
        - name: oracle-data
          persistentVolumeClaim:
            claimName: nfs-oracle
---
apiVersion: v1
kind: Service
metadata:
  name: oracle-service
spec:
  selector:
    app: oracle-label
  type: NodePort
  ports:
  - port: 1521
    targetPort: 1521
    nodePort: 1521

sudo mkdir /nfs/oracle

kubectl apply -f oracle.yaml

Redis

注意这里 resources 项限制了 CPU 和 Memory 资源

apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis-deployment
spec:
  selector:
    matchLabels:
      app: redis-label
  replicas: 1
  template:
    metadata:
      labels:
        app: redis-label
    spec:
      containers:
      - name: redis
        image: redis:alpine
        resources:
          limits:
            cpu: 1
            memory: 512Mi
          requests:
            cpu: 0.5
            memory: 128Mi
        ports:
        - containerPort: 6379
---
apiVersion: v1
kind: Service
metadata:
  name: redis-service
spec:
  selector:
    app: redis-label
  type: NodePort
  ports:
  - port: 6379
    targetPort: 6379
    nodePort: 6379

kubectl apply -f redis.yaml

部署应用到指定 Node 节点

两种方式：NodeName  和 NodeSelector

一、NodeName

以部署 RabbitMQ 为例，注意 nodeName 属性值为节点名称

apiVersion: apps/v1
kind: Deployment
metadata:
  name: rabbitmq-deployment
spec:
  selector:
    matchLabels:
      app: rabbitmq-label
  replicas: 1
  template:
    metadata:
      labels:
        app: rabbitmq-label
    spec:
      nodeName: k8s-node-8
      containers:
      - name: rabbitmq
        image: rabbitmq:management-alpine
        resources:
          limits:
            cpu: 1
            memory: 512Mi
          requests:
            cpu: 0.5
            memory: 128Mi
        env:
        - name: RABBITMQ_DEFAULT_VHOST
          value: my_vhost
        - name: RABBITMQ_DEFAULT_USER
          value: guest
        - name: RABBITMQ_DEFAULT_PASS
          value: guest
        ports:
        - containerPort: 5672
        - containerPort: 15672
---
apiVersion: v1
kind: Service
metadata:
  name: rabbitmq-service
spec:
  selector:
    app: rabbitmq-label
  type: NodePort
  ports:
  - name: app
    port: 5672
    targetPort: 5672
    nodePort: 5672
  - name: ui
    port: 15672
    targetPort: 15672
    nodePort: 15672

部署查看

kubectl apply -f rabbitmq.yaml
kubectl get pods -o wide

二、NodeSelector

给 Node 设置标签

kubectl label nodes k8s-node-8 deploy=hello
kubectl get nodes --show-labels

已部署 MQ 为例，注意 nodeSelector 属性值为标签属性值

apiVersion: apps/v1
kind: Deployment
metadata:
  name: rabbitmq-deployment
spec:
  selector:
    matchLabels:
      app: rabbitmq-label
  replicas: 1
  template:
    metadata:
      labels:
        app: rabbitmq-label
    spec:
      nodeSelector:
        deploy: hello
      containers:
      - name: rabbitmq
        image: rabbitmq:management-alpine
        resources:
          limits:
            cpu: 1
            memory: 512Mi
          requests:
            cpu: 0.5
            memory: 128Mi
        env:
        - name: RABBITMQ_DEFAULT_VHOST
          value: my_vhost
        - name: RABBITMQ_DEFAULT_USER
          value: guest
        - name: RABBITMQ_DEFAULT_PASS
          value: guest
        ports:
        - containerPort: 5672
        - containerPort: 15672
---
apiVersion: v1
kind: Service
metadata:
  name: rabbitmq-service
spec:
  selector:
    app: rabbitmq-label
  type: NodePort
  ports:
  - name: app
    port: 5672
    targetPort: 5672
    nodePort: 5672
  - name: ui
    port: 15672
    targetPort: 15672
    nodePort: 15672

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http://www.mydlq.club/article/65