部署mysql

• nacos连接外部mysql sts
• 使用mysql-0.mysql.dmgeo-lib.svc.cluster.local进行连接，同一ns下可以省略后面的。
• 需要先初始化数据：创建nacos_config数据库，并source导入如下sql：
  • https://github.com/alibaba/nacos/edit/master/distribution/conf/nacos-mysql.sql
• 将宿主机文件拷贝进pod里面
  • sudo kubectl cp nacos-mysql.sql mysql-0:/var/lib/mysql/nacos_config -n dmgeo-lib
• 然后在mysql-0 pod里面执行source导入操作。

[root@k8s-n0 nacos]# cat ../mysql/sts/mysql-cluster.yaml 
apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql-configmap
  namespace: dmgeo-lib
  labels:
    app: mysql
data:
  primary.cnf: |
    # Apply this config only on the primary.
    [mysqld]
    log-bin
  replica.cnf: |
    # Apply this config only on replicas.
    [mysqld]
    super-read-only

---
# Headless service for stable DNS entries of StatefulSet members.
apiVersion: v1
kind: Service
metadata:
  name: mysql
  namespace: dmgeo-lib
  labels:
    app: mysql
spec:
  ports:
  - name: mysql
    port: 3306
  clusterIP: None
  selector:
    app: mysql
---
# Client service for connecting to any MySQL instance for reads.
# For writes, you must instead connect to the primary: mysql-0.mysql.
apiVersion: v1
kind: Service
metadata:
  name: mysql-read
  namespace: dmgeo-lib
  labels:
    app: mysql
spec:
  ports:
  - name: mysql
    port: 3306
  selector:
    app: mysql

---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql
  namespace: dmgeo-lib
spec:
  selector:
    matchLabels:
      app: mysql
  serviceName: mysql
  replicas: 3 
  template:
    metadata:
      labels:
        app: mysql
    spec:
      initContainers:
      - name: init-mysql
        image: 192.168.145.28:1603/lego/mysql/mysql:5.7
        command:
        - bash
        - "-c"
        - |
          set -ex
          # Generate mysql server-id from pod ordinal index.
          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          echo [mysqld] > /mnt/conf.d/server-id.cnf
          # Add an offset to avoid reserved server-id=0 value.
          echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf
          # Copy appropriate conf.d files from config-map to emptyDir.
          if [[ $ordinal -eq 0 ]]; then
            cp /mnt/config-map/primary.cnf /mnt/conf.d/
          else
            cp /mnt/config-map/replica.cnf /mnt/conf.d/
          fi
        volumeMounts:
        - name: mysql-conf
          mountPath: /mnt/conf.d
        - name: mysql-configmap
          mountPath: /mnt/config-map
      - name: clone-mysql
        image: 192.168.145.28:1603/lego/mysql/twoeo/gcr.io-google-samples-xtrabackup:latest
        command:
        - bash
        - "-c"
        - |
          set -ex
          # Skip the clone if data already exists.
          [[ -d /var/lib/mysql/mysql ]] && exit 0
          # Skip the clone on primary (ordinal index 0).
          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          [[ $ordinal -eq 0 ]] && exit 0
          # Clone data from previous peer.
          ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql
          # Prepare the backup.
          xtrabackup --prepare --target-dir=/var/lib/mysql
        volumeMounts:
        - name: mysql-data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: mysql-conf
          mountPath: /etc/mysql/conf.d
      containers:
      - name: mysql
        image: 192.168.145.28:1603/lego/mysql/mysql:5.7
        env:
        #- name: MYSQL_ROOT_PASSWORD
        #  value: 123456
        - name: MYSQL_ALLOW_EMPTY_PASSWORD
          value: "1"
        - name: MYSQL_ROOT_PASSWORD
          value: "root"
        - name: MYSQL_DATABASE
          value: "nacos_config"
        - name: MYSQL_USER
          value: "nacos"
        - name: MYSQL_PASSWORD
          value: "nacos"
        ports:
        - name: mysql
          containerPort: 3306
        volumeMounts:
        - name: mysql-data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: mysql-conf
          mountPath: /etc/mysql/conf.d
        resources:
          requests:
            cpu: 500m
            memory: 1Gi
        livenessProbe:
          exec:
            command: ["mysqladmin", "ping"]
          initialDelaySeconds: 30
          periodSeconds: 10
          timeoutSeconds: 5
        readinessProbe:
          exec:
            # Check we can execute queries over TCP (skip-networking is off).
            command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"]
          initialDelaySeconds: 5
          periodSeconds: 2
          timeoutSeconds: 1
      - name: xtrabackup
        image: 192.168.145.28:1603/lego/mysql/twoeo/gcr.io-google-samples-xtrabackup:latest
        ports:
        - name: xtrabackup
          containerPort: 3307
        command:
        - bash
        - "-c"
        - |
          set -ex
          cd /var/lib/mysql

          # Determine binlog position of cloned data, if any.
          if [[ -f xtrabackup_slave_info && "x$(<xtrabackup_slave_info)" != "x" ]]; then
            # XtraBackup already generated a partial "CHANGE MASTER TO" query
            # because we're cloning from an existing replica. (Need to remove the tailing semicolon!)
            cat xtrabackup_slave_info | sed -E 's/;$//g' > change_master_to.sql.in
            # Ignore xtrabackup_binlog_info in this case (it's useless).
            rm -f xtrabackup_slave_info xtrabackup_binlog_info
          elif [[ -f xtrabackup_binlog_info ]]; then
            # We're cloning directly from primary. Parse binlog position.
            [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
            rm -f xtrabackup_binlog_info xtrabackup_slave_info
            echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\
                  MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in
          fi

          # Check if we need to complete a clone by starting replication.
          if [[ -f change_master_to.sql.in ]]; then
            echo "Waiting for mysqld to be ready (accepting connections)"
            until mysql -h 127.0.0.1 -e "SELECT 1"; do sleep 1; done

            echo "Initializing replication from clone position"
            mysql -h 127.0.0.1 \
                  -e "$(<change_master_to.sql.in), \
                          MASTER_HOST='mysql-0.mysql', \
                          MASTER_USER='root', \
                          MASTER_PASSWORD='', \
                          MASTER_CONNECT_RETRY=10; \
                        START SLAVE;" || exit 1
            # In case of container restart, attempt this at-most-once.
            mv change_master_to.sql.in change_master_to.sql.orig
          fi

          # Start a server to send backups when requested by peers.
          exec ncat --listen --keep-open --send-only --max-conns=1 3307 -c \
            "xtrabackup --backup --slave-info --stream=xbstream --host=127.0.0.1 --user=root"
        volumeMounts:
        - name: mysql-data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: mysql-conf
          mountPath: /etc/mysql/conf.d
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
      volumes:
      - name: mysql-conf
        emptyDir: {}
      - name: mysql-configmap
        configMap:
          name: mysql-configmap
  volumeClaimTemplates:
  - metadata:
      name: mysql-data
    spec:
      accessModes: ["ReadWriteOnce"]
      resources:
        requests:
          storage: 10Gi

部署nacos

all-in-one.yaml

[root@k8s-n0 nacos]# cat all-in-one.yaml 
apiVersion: v1
kind: ConfigMap
metadata:
  name: nacos-cm
  namespace: dmgeo-lib
data:
  mysql.host: "mysql-0.mysql"
  mysql.db.name: "nacos_config"
  mysql.port: "3306"
  mysql.user: "root"
  mysql.password: ""

---
apiVersion: v1
kind: Service
metadata:
  name: nacos-svc
  namespace: dmgeo-lib
  labels:
    app: nacos-svc
spec:
  type: NodePort
  ports:
    - port: 8848
      name: nacos-svc
      targetPort: 8848
      nodePort: 8848
  selector:
    app: nacos
---
apiVersion: v1
kind: Service
metadata:
  name: nacos-headless
  namespace: dmgeo-lib
  labels:
    app: nacos-headless
spec:
  type: ClusterIP
  clusterIP: None
  ports:
    - port: 8848
      name: server
      targetPort: 8848
    - port: 7848
      name: rpc
      targetPort: 7848
  clusterIP: None
  selector:
    app: nacos
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nacos
  namespace: dmgeo-lib
spec:
  serviceName: nacos-headless
  replicas: 3
  template:
    metadata:
      labels:
        app: nacos
      annotations:
        pod.alpha.kubernetes.io/initialized: "true"
    spec:
      imagePullSecrets:           # dokcer仓库密码，不需要的可以去掉
        - name: registry-harbor
      terminationGracePeriodSeconds: 65
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                      - nacos
              topologyKey: "kubernetes.io/hostname"
      containers:
        - name: k8snacos
          imagePullPolicy: Always
          image: 192.168.145.28:1603/lego/nacos/nacos-server:latest
          resources:
            requests:
              memory: "2Gi"
              cpu: "500m"
          ports:
            - containerPort: 8848
              name: client
            - containerPort: 7848
              name: rpc
          env:
            - name: NACOS_REPLICAS
              value: "3"
            - name: MYSQL_SERVICE_HOST
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.host
            - name: MYSQL_SERVICE_DB_NAME
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.db.name
            - name: MYSQL_SERVICE_PORT
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.port
            - name: MYSQL_SERVICE_USER
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.user
            - name: MYSQL_SERVICE_PASSWORD
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.password
            - name: MODE
              value: "cluster"
            - name: NACOS_SERVER_PORT
              value: "8848"
            - name: PREFER_HOST_MODE
              value: "hostname"
            - name: NACOS_SERVERS
              value: "nacos-0.nacos-headless.dmgeo-lib.svc.cluster.local:8848 nacos-1.nacos-headless.dmgeo-lib.svc.cluster.local:8848 nacos-2.nacos-headless.dmgeo-lib.svc.cluster.local:8848"
  selector:
    matchLabels:
      app: nacos