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apiVersion: apps/v1 |
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kind: StatefulSet |
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metadata: |
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name: mysql |
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spec: |
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selector: |
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matchLabels: |
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app: mysql |
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serviceName: mysql |
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replicas: 3 |
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template: |
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metadata: |
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labels: |
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app: mysql |
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spec: |
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initContainers: |
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- name: init-mysql |
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image: mysql:5.7 |
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command: |
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- bash |
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- "-c" |
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- | |
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set -ex |
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# Generate mysql server-id from pod ordinal index. |
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[[ `hostname` =~ -([0-9]+)$ ]] || exit 1 |
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ordinal=${BASH_REMATCH[1]} |
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echo [mysqld] > /mnt/conf.d/server-id.cnf |
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# Add an offset to avoid reserved server-id=0 value. |
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echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf |
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# Copy appropriate conf.d files from config-map to emptyDir. |
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if [[ $ordinal -eq 0 ]]; then |
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cp /mnt/config-map/primary.cnf /mnt/conf.d/ |
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else |
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cp /mnt/config-map/replica.cnf /mnt/conf.d/ |
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fi |
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volumeMounts: |
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- name: conf |
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mountPath: /mnt/conf.d |
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- name: config-map |
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mountPath: /mnt/config-map |
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- name: clone-mysql |
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image: gcr.io/google-samples/xtrabackup:1.0 |
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command: |
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- bash |
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- "-c" |
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- | |
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set -ex |
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# Skip the clone if data already exists. |
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[[ -d /var/lib/mysql/mysql ]] && exit 0 |
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# Skip the clone on primary (ordinal index 0). |
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[[ `hostname` =~ -([0-9]+)$ ]] || exit 1 |
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ordinal=${BASH_REMATCH[1]} |
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[[ $ordinal -eq 0 ]] && exit 0 |
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# Clone data from previous peer. |
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ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql |
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# Prepare the backup. |
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xtrabackup --prepare --target-dir=/var/lib/mysql |
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volumeMounts: |
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- name: data |
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mountPath: /var/lib/mysql |
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subPath: mysql |
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- name: conf |
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mountPath: /etc/mysql/conf.d |
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containers: |
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- name: mysql |
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image: mysql:5.7 |
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env: |
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- name: MYSQL_ALLOW_EMPTY_PASSWORD |
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value: "1" |
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ports: |
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- name: mysql |
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containerPort: 3306 |
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volumeMounts: |
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- name: data |
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mountPath: /var/lib/mysql |
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subPath: mysql |
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- name: conf |
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mountPath: /etc/mysql/conf.d |
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resources: |
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requests: |
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cpu: 500m |
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memory: 1Gi |
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livenessProbe: |
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exec: |
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command: ["mysqladmin", "ping"] |
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initialDelaySeconds: 30 |
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periodSeconds: 10 |
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timeoutSeconds: 5 |
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readinessProbe: |
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exec: |
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# Check we can execute queries over TCP (skip-networking is off). |
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command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"] |
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initialDelaySeconds: 5 |
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periodSeconds: 2 |
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timeoutSeconds: 1 |
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- name: xtrabackup |
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image: gcr.io/google-samples/xtrabackup:1.0 |
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ports: |
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- name: xtrabackup |
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containerPort: 3307 |
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command: |
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- bash |
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- "-c" |
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- | |
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set -ex |
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cd /var/lib/mysql |
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# Determine binlog position of cloned data, if any. |
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if [[ -f xtrabackup_slave_info && "x$(<xtrabackup_slave_info)" != "x" ]]; then |
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# XtraBackup already generated a partial "CHANGE MASTER TO" query |
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# because we're cloning from an existing replica. (Need to remove the tailing semicolon!) |
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cat xtrabackup_slave_info | sed -E 's/;$//g' > change_master_to.sql.in |
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# Ignore xtrabackup_binlog_info in this case (it's useless). |
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rm -f xtrabackup_slave_info xtrabackup_binlog_info |
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elif [[ -f xtrabackup_binlog_info ]]; then |
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# We're cloning directly from primary. Parse binlog position. |
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[[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1 |
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rm -f xtrabackup_binlog_info xtrabackup_slave_info |
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echo "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\ |
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MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.in |
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fi |
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# Check if we need to complete a clone by starting replication. |
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if [[ -f change_master_to.sql.in ]]; then |
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echo "Waiting for mysqld to be ready (accepting connections)" |
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until mysql -h 127.0.0.1 -e "SELECT 1"; do sleep 1; done |
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echo "Initializing replication from clone position" |
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mysql -h 127.0.0.1 \ |
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-e "$(<change_master_to.sql.in), \ |
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MASTER_HOST='mysql-0.mysql', \ |
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MASTER_USER='root', \ |
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MASTER_PASSWORD='', \ |
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MASTER_CONNECT_RETRY=10; \ |
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START SLAVE;" || exit 1 |
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# In case of container restart, attempt this at-most-once. |
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mv change_master_to.sql.in change_master_to.sql.orig |
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fi |
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# Start a server to send backups when requested by peers. |
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exec ncat --listen --keep-open --send-only --max-conns=1 3307 -c \ |
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"xtrabackup --backup --slave-info --stream=xbstream --host=127.0.0.1 --user=root" |
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volumeMounts: |
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- name: data |
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mountPath: /var/lib/mysql |
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subPath: mysql |
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- name: conf |
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mountPath: /etc/mysql/conf.d |
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resources: |
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requests: |
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cpu: 100m |
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memory: 100Mi |
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volumes: |
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- name: conf |
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emptyDir: {} |
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- name: config-map |
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configMap: |
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name: mysql |
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volumeClaimTemplates: |
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- metadata: |
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name: data |
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spec: |
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accessModes: ["ReadWriteOnce"] |
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resources: |
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requests: |
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storage: 10Gi |
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