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- apiVersion: apps/v1
- kind: StatefulSet
- metadata:
- name: mysql
- spec:
- selector:
- matchLabels:
- app: mysql
- serviceName: mysql
- replicas: 2
- 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]}
- [[ $ordinal -eq 0 ]] && exit 0
- # Clone data from previous peer.
- ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql
- # Prepare the backup.
- xtrabackup --prepare --target-dir=/var/lib/mysql
- volumeMounts:
- - name: data
- mountPath: /var/lib/mysql
- subPath: mysql
- - name: conf
- mountPath: /etc/mysql/conf.d
- containers:
- - name: mysql
- image: mysql:5.7
- env:
- - name: MYSQL_ALLOW_EMPTY_PASSWORD
- value: "1"
- ports:
- - name: mysql
- containerPort: 3306
- volumeMounts:
- - name: data
- mountPath: /var/lib/mysql
- subPath: mysql
- - name: conf
- mountPath: /etc/mysql/conf.d
- - name: xtrabackup
- image: gcr.io/google-samples/xtrabackup:1.0
- ports:
- - name: xtrabackup
- containerPort: 3307
- command:
- - bash
- - "-c"
- - |
- set -ex
- cd /var/lib/mysql
- # Determine binlog position of cloned data, if any.
- if [[ -f xtrabackup_slave_info && "x$(<xtrabackup_slave_info)" != "x" ]]; then
- # XtraBackup already generated a partial "CHANGE MASTER TO" query
- # because we're cloning from an existing slave. (Need to remove the tailing semicolon!)
- cat xtrabackup_slave_info | sed -E 's/;$//g' > change_master_to.sql.in
- # Ignore xtrabackup_binlog_info in this case (it's useless).
- rm -f xtrabackup_slave_info xtrabackup_binlog_info
- elif [[ -f xtrabackup_binlog_info ]]; then
- # We're cloning directly from master. Parse binlog position.
- [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || 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: 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
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