Fix the MySQL server statefulset for Azure container storage

workshops/advanced-aks/assets/acstor-mysql-statefulset.yaml

@@ -6,164 +6,165 @@ spec:
   selector:
     matchLabels:
       app: mysql
+      app.kubernetes.io/name: mysql
   serviceName: mysql
   replicas: 1
   template:
     metadata:
       labels:
         app: mysql
+        app.kubernetes.io/name: mysql
     spec:
-      # Use the scheduler extender to ensure the pod is placed on a node with an attachment replica on failover.
-      schedulerName: csi-azuredisk-scheduler-extender
       initContainers:
-        - name: init-mysql
-          image: 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 [[ $ordinal -eq 0 ]]; then
-                cp /mnt/config-map/primary.cnf /mnt/conf.d/
-              else
-                cp /mnt/config-map/replica.cnf /mnt/conf.d/
-              fi
-          volumeMounts:
-            - name: conf
-              mountPath: /mnt/conf.d
-            - name: config-map
-              mountPath: /mnt/config-map
-        - name: clone-mysql
-          image: gcr.io/google-samples/xtrabackup:1.0
-          command:
-            - bash
-            - "-c"
-            - |
-              set -ex
-              # Skip the clone if data already exists.
-              [[ -d /var/lib/mysql/mysql ]] && exit 0
-              # Skip the clone on primary (ordinal index 0).
-              [[ `hostname` =~ -([0-9]+)$ ]] || 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: data
-              mountPath: /var/lib/mysql
-              subPath: mysql
-            - name: conf
-              mountPath: /etc/mysql/conf.d
+      - name: init-mysql
+        image: 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 [[ $ordinal -eq 0 ]]; then
+            cp /mnt/config-map/primary.cnf /mnt/conf.d/
+          else
+            cp /mnt/config-map/replica.cnf /mnt/conf.d/
+          fi
+        volumeMounts:
+        - name: conf
+          mountPath: /mnt/conf.d
+        - name: config-map
+          mountPath: /mnt/config-map
+      - name: clone-mysql
+        image: gcr.io/google-samples/xtrabackup:1.0
+        command:
+        - bash
+        - "-c"
+        - |
+          set -ex
+          # Skip the clone if data already exists.
+          [[ -d /var/lib/mysql/mysql ]] && exit 0
+          # Skip the clone on primary (ordinal index 0).
+          [[ `hostname` =~ -([0-9]+)$ ]] || 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: data
+          mountPath: /var/lib/mysql
+          subPath: mysql
+        - name: conf
+          mountPath: /etc/mysql/conf.d
       containers:
+      - name: mysql
+        image: mysql:5.7
+        env:
+        - name: MYSQL_ALLOW_EMPTY_PASSWORD
+          value: "1"
+        ports:
         - name: mysql
-          image: mysql:5.7
-          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:
-              # 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
+          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:
+            # 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: gcr.io/google-samples/xtrabackup:1.0
+        ports:
         - name: xtrabackup
-          image: gcr.io/google-samples/xtrabackup:1.0
-          ports:
-            - name: xtrabackup
-              containerPort: 3307
-          command:
-            - bash
-            - "-c"
-            - |
-              set -ex
-              cd /var/lib/mysql
+          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
+          # 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
+          # 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 "$(<change_master_to.sql.in), \
-                              MASTER_HOST='mysql-0.mysql', \
-                              MASTER_USER='root', \
-                              MASTER_PASSWORD='', \
-                              MASTER_CONNECT_RETRY=10; \
-                            START SLAVE;" || exit 1
-                # In case of container restart, attempt this at-most-once.
-                mv change_master_to.sql.in change_master_to.sql.orig
-              fi
+            echo "Initializing replication from clone position"
+            mysql -h 127.0.0.1 \
+                  -e "$(<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: data
-              mountPath: /var/lib/mysql
-              subPath: mysql
-            - name: conf
-              mountPath: /etc/mysql/conf.d
-          resources:
-            requests:
-              cpu: 100m
-              memory: 100Mi
-      volumes:
+          # 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: data
+          mountPath: /var/lib/mysql
+          subPath: mysql
         - name: conf
-          emptyDir: {}
-        - name: config-map
-          configMap:
-            name: mysql
-  volumeClaimTemplates:
-    - metadata:
-        name: data
-      spec:
-        accessModes: ["ReadWriteOnce"]
-        storageClassName: acstor-ephemeraldisk-nvme
+          mountPath: /etc/mysql/conf.d
         resources:
           requests:
-            storage: 256Gi
+            cpu: 100m
+            memory: 100Mi
+      volumes:
+      - name: conf
+        emptyDir: {}
+      - name: config-map
+        configMap:
+          name: mysql
+  volumeClaimTemplates:
+  - metadata:
+      name: data
+      annotations:
+        acstor.azure.com/accept-ephemeral-storage: "true"
+    spec:
+      accessModes: ["ReadWriteOnce"]
+      resources:
+        requests:
+          storage: 10Gi