github.com/SamarSidharth/kpt@v0.0.0-20231122062228-c7d747ae3ace/internal/testutil/testdata/dataset3/mysql/mysql-statefulset.resource.yaml

# Copyright 2019 The kpt Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mysql
spec:
  replicas: 3 # {"$ref": "#/definitions/io.k8s.cli.setters.replicas"}
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      initContainers:
        - name: init-mysql
          image: mysql:5.7
          command:
            - bash
            - -c
            - |
              set -ex
              # Generate mysql server-id from pod ordinal index.
              [[ `hostname` =~ -([0-9]+)$ ]] || 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 [[ $ordinal -eq 0 ]]; then
                cp /mnt/config-map/master.cnf /mnt/conf.d/
              else
                cp /mnt/config-map/slave.cnf /mnt/conf.d/
              fi
          volumeMounts:
            - name: conf
              mountPath: /mnt/conf.d
            - name: config-map
              mountPath: /mnt/config-map
        - name: clone-mysql
          image: gcr.io/google-samples/xtrabackup:1.0
          command:
            - bash
            - -c
            - |
              set -ex
              # Skip the clone if data already exists.
              [[ -d /var/lib/mysql/mysql ]] && exit 0
              # Skip the clone on master (ordinal index 0).
              [[ `hostname` =~ -([0-9]+)$ ]] || 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:8.0
          ports:
            - name: mysql
              containerPort: 3306
          env:
            - name: MYSQL_ALLOW_EMPTY_PASSWORD
              value: "1"
          resources:
            requests:
              cpu: 500m
              memory: 1Gi
          volumeMounts:
            - name: data
              mountPath: /var/lib/mysql
              subPath: mysql
            - name: conf
              mountPath: /etc/mysql/conf.d
          livenessProbe:
            exec:
              command:
                - mysqladmin
                - ping
            initialDelaySeconds: 45
            periodSeconds: 15
            timeoutSeconds: 5
          readinessProbe:
            exec:
              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
          command:
            - bash
            - -c
            - |
              set -ex
              cd /var/lib/mysql
              # Determine binlog position of cloned data, if any.
              if [[ -f xtrabackup_slave_info ]]; then
                # XtraBackup already generated a partial "CHANGE MASTER TO" query
                # because we're cloning from an existing slave.
                mv xtrabackup_slave_info change_master_to.sql.in
                # Ignore xtrabackup_binlog_info in this case (it's useless).
                rm -f xtrabackup_binlog_info
              elif [[ -f xtrabackup_binlog_info ]]; then
                # We're cloning directly from master. Parse binlog position.
                [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
                rm xtrabackup_binlog_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"
                # In case of container restart, attempt this at-most-once.
                mv change_master_to.sql.in change_master_to.sql.orig
                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
              # 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"
          ports:
            - name: xtrabackup
              containerPort: 3307
          resources:
            requests:
              cpu: 100m
              memory: 100Mi
          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:
        resources:
          requests:
            storage: 10Gi
        accessModes:
          - ReadWriteOnce
  serviceName: mysql