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Adding a New MySQL Pod (mysql-4 Pod)

For details about how to add a new physical machine to a K8s cluster, see Kubernetes 1.18.20 Deployment Guide (CentOS & openEuler).

  1. Open the mysql_deployment.yaml configuration file on the physical machine of the primary node.
    vim mysql_deployment.yaml
  2. Press i to enter the insert mode and add the new pod deployment. Modify the content as follows:
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    ......
---
apiVersion: v1
kind: Pod
metadata:
  name: mysql-1
......
  hostAliases:
  ......
  - ip: "10.99.0.18"
    hostnames:
    - "mysql-4"
......
---
apiVersion: v1
kind: Pod
metadata:
  name: mysql-2
......
  hostAliases:
  ......
  - ip: "10.99.0.18"
    hostnames:
    - "mysql-4"
......
---
apiVersion: v1
kind: Pod
metadata:
  name: mysql-3
......
  hostAliases:
  ......
  - ip: "10.99.0.18"
    hostnames:
    - "mysql-4"
......
---
apiVersion: v1
kind: Pod
metadata:
  labels:
    app: mysql-4
  name: mysql-4
  namespace: ns-mysql-test
  annotations:
    ovn.kubernetes.io/ip_address: 10.99.0.18
    ovn.kubernetes.io/mac_address: 00:00:00:53:6B:B9
spec:
  nodeSelector:
    test: "mysql-test-4"
  hostAliases:
  - ip: "10.99.0.15"
    hostnames:
    - "mysql-1"
  - ip: "10.99.0.16"
    hostnames:
    - "mysql-2"
  - ip: "10.99.0.17"
    hostnames:
    - "mysql-3"
  - ip: "10.99.0.18"
    hostnames:
    - "mysql-4"
  containers:
  - name: mysql-4
    image: mymysql/centos8-mysql-arm:8.0.19
    resources:
      limits:
        cpu: 16
        memory: 64Gi
    ports:
    - name: mysql-port
      containerPort: 3306
    - name: copy-port
      containerPort: 33061
    env:
    - name: MYSQL_ROOT_PASSWORD
      value: test123
    - name: MYSQL_ROOT_HOST
      value: "%"
    volumeMounts:
    - name: mysql-data
      mountPath: "/data/mysql/data"
    - name: mysql-log
      mountPath: "/data/mysql/log"
    - name: mysql-run
      mountPath: "/data/mysql/run"
    - name: mysql-tmp
      mountPath: "/data/mysql/tmp"
    - name: mysql-cnf
      mountPath: "/etc/my.cnf"
  volumes:
  - name: mysql-data
    hostPath:
      path: "/data/mysql/mysql_4/data"
      type: DirectoryOrCreate
  - name: mysql-log
    hostPath:
      path: "/data/mysql/mysql_4/log"
      type: DirectoryOrCreate
  - name: mysql-run
    hostPath:
      path: "/data/mysql/mysql_4/run"
      type: DirectoryOrCreate
  - name: mysql-tmp
    hostPath:
      path: "/data/mysql/mysql_4/tmp"
      type: DirectoryOrCreate
  - name: mysql-cnf
    hostPath:
      path: "/data/mysql/mysql_4/mysql_arm.cnf"
      type: FileOrCreate
......
---
apiVersion: v1
kind: Service
metadata: 
  name: mysql-4-service
  namespace: ns-mysql-test
spec:
  type: NodePort
  selector:
    app: mysql-4
  ports:
    - name: dbport
      protocol: TCP
      port: 3306
      targetPort: 3306
      nodePort: 30004
    - name: cpport
      protocol: TCP
      port: 33061
      targetPort: 33061
      nodePort: 30064
  3. Press Esc, type :wq!, and press Enter to save the file and exit.

The preceding YAML file is modified as follows:

  1. The host name resolution rule of mysql-4 is added to the hostAliases of other MySQL pods. (This rule is used when the MGR group is created.)
  2. The pod deployment configuration of mysql-4 is added to the file. The namespace of the pod must be the same as that of other MySQL pods. The IP address, MAC address, and host path to which the data directory is mounted cannot conflict with those of other pods.
  3. The service deployment of mysql-4-service is added to the file. The deployment type is NodePort. Map ports 3306 and 33061 of mysql-4 to ports 30004 and 33064 of the physical machine, respectively.
  4. The other configurations of mysql-4 are similar to those of mysql-1, mysql-2, and mysql-3.
Parent topic: K8s MGR Maintenance