云原生学习作业7

一.基于StatefulSet控制器运行Redis Cluster

1，创建pv

apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv0
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/redis-cluster/redis0

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv1
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/redis-cluster/redis1

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv2
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/redis-cluster/redis2

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv3
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/redis-cluster/redis3

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv4
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/redis-cluster/redis4

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: redis-pv5
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteMany
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/redis-cluster/redis5

2,创建configmap

redis.conf内容如下：
appendonly yes
cluster-enabled yes
cluster-config-file /var/lib/redis/nodes.conf
cluster-node-timeout 5000
dir /var/lib/redis
port 6379

执行创建命令：
kubectl create configmap redis-conf --from-file=redis.conf -n myserver

3，创建redis:

apiVersion: v1
kind: Service
metadata:
  name: redis
  namespace: myserver
  labels:
    app: redis
spec:
  selector:
    app: redis
    appCluster: redis-cluster
  ports:
  - name: redis
    port: 6379
  clusterIP: None
   
---
apiVersion: v1
kind: Service
metadata:
  name: redis-access
  namespace: myserver
  labels:
    app: redis
spec:
  selector:
    app: redis
    appCluster: redis-cluster
  ports:
  - name: redis-access
    protocol: TCP
    port: 6379
    targetPort: 6379
 
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: redis
  namespace: myserver
spec:
  serviceName: redis
  replicas: 6
  selector:
    matchLabels:
      app: redis
      appCluster: redis-cluster
  template:
    metadata:
      labels:
        app: redis
        appCluster: redis-cluster
    spec:
      containers:
      - name: redis
        image: redis:latest
        command:
          - "redis-server"
        args:
          - "/etc/redis/redis.conf"
          - "--protected-mode"
          - "no"
        resources:
          requests:
            cpu: "100m"
            memory: "100Mi"
        ports:
        - containerPort: 6379
          name: redis
          protocol: TCP
        - containerPort: 16379
          name: cluster
          protocol: TCP
        volumeMounts:
        - name: conf
          mountPath: /etc/redis
        - name: data
          mountPath: /var/lib/redis
      volumes:
      - name: conf
        configMap:
          name: redis-conf
          items:
          - key: redis.conf
            path: redis.conf
  volumeClaimTemplates:
  - metadata:
      name: data
      namespace: myserver
    spec:
      accessModes: [ "ReadWriteMany" ]
      resources:
        requests:
          storage: 5Gi

4，进入其中一个redis POD执行命令创建集群：

5，验证集群状态：

二.基于StatefulSet控制器运行MySQL一主多从

1，创建PV

apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv0
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/mysql-cluster/mysql0

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv1
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/mysql-cluster/mysql1

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv2
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/mysql-cluster/mysql2

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv3
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/mysql-cluster/mysql3

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv4
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/mysql-cluster/mysql4

---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv5
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  nfs:
    server: 172.27.16.17
    path: /data/nfs/k8sdata/mysql-cluster/mysql5

2，创建configMap

apiVersion: v1
kind: ConfigMap
metadata:
  name: mysql
  labels:
    app: mysql
data:
  master.cnf: |
    [mysqld]
    log-bin
  slave.cnf: |
    [mysqld]
    super-read-only

3，创建service

apiVersion: v1
kind: Service
metadata:
  name: mysql
  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
  labels:
    app: mysql
spec:
  ports:
  - name: mysql
    port: 3306
  selector:
    app: mysql

4,statefulset创建mysql

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql
spec:
  selector:
    matchLabels:
      app: mysql
  serviceName: mysql
  replicas: 3
  template:
    metadata:
      labels:
        app: mysql
    spec:
      initContainers:
      - name: init-mysql
        image: mysql:5.7.36
        command:
        - bash
        - "-c"
        - |
          set -ex
          # 从 Pod 的序号，生成 server-id
          # [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
          [[ `echo $HOSTNAME` =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          echo [mysqld] > /mnt/conf.d/server-id.cnf
          # 由于 server-id=0 有特殊含义，我们给 ID 加一个 100 来避开它
          echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf
          # 如果 Pod 序号是 0，说明它是 Master 节点，从 ConfigMap 里把 Master 的配置文件拷贝到 /mnt/conf.d/ 目录；
          # 否则，拷贝 Slave 的配置文件
          if [[ $ordinal -eq 0 ]]; then
            cp /mnt/config-map/master.cnf /mnt/conf.d/
          else
            cp /mnt/config-map/slave.cnf /mnt/conf.d/
          fi
        volumeMounts:
        - name: conf
          mountPath: /mnt/conf.d
        - name: config-map
          mountPath: /mnt/config-map
      - name: clone-mysql
        image: registry.cn-hangzhou.aliyuncs.com/chenjie2022/xtrabackup:1.0
        command:
        - bash
        - "-c"
        - |
          set -ex
          # 拷贝操作只需要在第一次启动时进行，所以如果数据已经存在，跳过
          [[ -d /var/lib/mysql/mysql ]] && exit 0
          # Master 节点 (序号为 0) 不需要做这个操作
          [[ `hostname` =~ -([0-9]+)$ ]] || exit 1
          ordinal=${BASH_REMATCH[1]}
          [[ $ordinal -eq 0 ]] && exit 0
          # 使用 ncat 指令，远程地从前一个节点拷贝数据到本地
          ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql
          # 执行 --prepare，这样拷贝来的数据就可以用作恢复了
          xtrabackup --prepare --target-dir=/var/lib/mysql
        volumeMounts:
        - name: data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: conf
          mountPath: /etc/mysql/conf.d
      containers:
      - name: mysql
        image: mysql:5.7.36
        env:
        - name: MYSQL_ALLOW_EMPTY_PASSWORD
          value: "1"
        ports:
        - name: mysql
          containerPort: 3306
        volumeMounts:
        - name: data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: 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:
            # 通过 TCP 连接的方式进行健康检查
            command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"]
          initialDelaySeconds: 5
          periodSeconds: 2
          timeoutSeconds: 1
      - name: xtrabackup
        image: registry.cn-hangzhou.aliyuncs.com/chenjie2022/xtrabackup:1.0
        ports:
        - name: xtrabackup
          containerPort: 3307
        command:
        - bash
        - "-c"
        - |
          set -ex
          cd /var/lib/mysql

          # 从备份信息文件里读取 MASTER_LOG_FILEM 和 MASTER_LOG_POS 这两个字段的值，用来拼装集群初始化 SQL
          if [[ -f xtrabackup_slave_info ]]; then
            # 如果 xtrabackup_slave_info 文件存在，说明这个备份数据来自于另一个 Slave 节点。这种情况下，XtraBackup 工具在备份的时候，
就已经在这个文件里自动生成了 "CHANGE MASTER TO" SQL 语句。所以，我们只需要把这个文件重命名为 change_master_to.sql.in，后面直接使用即
可
            mv xtrabackup_slave_info change_master_to.sql.in
            # 所以，也就用不着 xtrabackup_binlog_info 了
            rm -f xtrabackup_binlog_info
          elif [[ -f xtrabackup_binlog_info ]]; then
            # 如果只存在 xtrabackup_binlog_inf 文件，那说明备份来自于 Master 节点，我们就需要解析这个备份信息文件，读取所需的两个字段
的值
            [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
            rm xtrabackup_binlog_info
            # 把两个字段的值拼装成 SQL，写入 change_master_to.sql.in 文件
            echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\
                  MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in
          fi

          # 如果 change_master_to.sql.in，就意味着需要做集群初始化工作
          if [[ -f change_master_to.sql.in ]]; then
            # 但一定要先等 mysql 容器启动之后才能进行下一步连接 mysql 的操作
            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"
            # 将文件 change_master_to.sql.in 改个名字，防止这个 Container 重启的时候，因为又找到了 change_master_to.sql.in，从而重复
执行一遍这个初始化流程
            mv change_master_to.sql.in change_master_to.sql.orig
            # 使用 change_master_to.sql.orig 的内容，也是就是前面拼装的 SQL，组成一个完整的初始化和启动 Slave 的 SQL 语句
            mysql -h 127.0.0.1 <<EOF
          $(<change_master_to.sql.orig),
            MASTER_HOST='mysql-0.mysql',
            MASTER_USER='root',
            MASTER_PASSWORD='',
            MASTER_CONNECT_RETRY=10;
          START SLAVE;
          EOF
          fi

          # 使用 ncat 监听 3307 端口。它的作用是，在收到传输请求的时候，直接执行 "xtrabackup --backup" 命令，备份 mysql 的数据并发送
给请求者
          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: data
          mountPath: /var/lib/mysql
          subPath: mysql
        - name: conf
          mountPath: /etc/mysql/conf.d
      volumes:
      - name: conf
        emptyDir: {}
      - name: config-map
        configMap:
          name: mysql
  volumeClaimTemplates:
  - metadata:
      name: data
    spec:
      accessModes: ["ReadWriteOnce"]
      resources:
        requests:
          storage: 5Gi