k8s部署mysql集群（statefulset）：主写从读、一主多从集群
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k8s部署mysql集群（statefulset）：主写从读、一主多从集群
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安裝nfs
server和client端都執行
yum install nfs-utils rpcbind -y systemctl start nfs systemctl start rpcbind systemctl enable nfs systemctl enable rpcbind部署nfs-provisioner
nfs-rbac.yaml
- rbac鑒權
- 設置nfs server
- 設置nfs客戶端與server端數據同步
- mkdir -p /home/nfsmount && mount -t nfs 192.168.116.101:/nfs/data /home/nfsmount
storageclass-nfs.yaml
apiVersion: storage.k8s.io/v1 kind: StorageClass metadata:name: storage-nfs provisioner: storage.pri/nfs reclaimPolicy: Delete編寫nfs-provisioner部署腳本
- 部署nfs-provisioner
- 設置為默認storageclass
[root@m-1 kubesphere-install]# cat start.sh
部署mysql一主兩從集群
mysql-all-in-one.yaml
apiVersion: v1 kind: ConfigMap metadata:name: mysql-configmapnamespace: dmgeo-liblabels:app: mysql data:primary.cnf: |# Apply this config only on the primary.[mysqld]log-binreplica.cnf: |# Apply this config only on replicas.[mysqld]super-read-only--- # Headless service for stable DNS entries of StatefulSet members. apiVersion: v1 kind: Service metadata:name: mysqlnamespace: dmgeo-liblabels:app: mysql spec:ports:- name: mysqlport: 3306clusterIP: Noneselector: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-readnamespace: dmgeo-liblabels:app: mysql spec:ports:- name: mysqlport: 3306selector:app: mysql--- apiVersion: apps/v1 kind: StatefulSet metadata:name: mysqlnamespace: dmgeo-lib spec:selector:matchLabels:app: mysqlserviceName: mysqlreplicas: 3template:metadata:labels:app: mysqlspec:initContainers:- name: init-mysqlimage: 192.168.145.28:1603/lego/mysql/mysql:5.7command:- bash- "-c"- |set -ex# Generate mysql server-id from pod ordinal index.[[ `hostname` =~ -([0-9]+)$ ]] || exit 1ordinal=${BASH_REMATCH[1]}echo [mysqld] > /mnt/conf.d/server-id.cnf# Add an offset to avoid reserved server-id=0 value.echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf# Copy appropriate conf.d files from config-map to emptyDir.if [[ $ordinal -eq 0 ]]; thencp /mnt/config-map/primary.cnf /mnt/conf.d/elsecp /mnt/config-map/replica.cnf /mnt/conf.d/fivolumeMounts:- name: mysql-confmountPath: /mnt/conf.d- name: mysql-configmapmountPath: /mnt/config-map- name: clone-mysqlimage: 192.168.145.28:1603/lego/mysql/twoeo/gcr.io-google-samples-xtrabackup:latestcommand:- bash- "-c"- |set -ex# Skip the clone if data already exists.[[ -d /var/lib/mysql/mysql ]] && exit 0# Skip the clone on primary (ordinal index 0).[[ `hostname` =~ -([0-9]+)$ ]] || exit 1ordinal=${BASH_REMATCH[1]}[[ $ordinal -eq 0 ]] && exit 0# Clone data from previous peer.ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql# Prepare the backup.xtrabackup --prepare --target-dir=/var/lib/mysqlvolumeMounts:- name: mysql-datamountPath: /var/lib/mysqlsubPath: mysql- name: mysql-confmountPath: /etc/mysql/conf.dcontainers:- name: mysqlimage: 192.168.145.28:1603/lego/mysql/mysql:5.7env:- name: MYSQL_ROOT_PASSWORDvalue: 123456#- name: MYSQL_ALLOW_EMPTY_PASSWORD# value: "1"ports:- name: mysqlcontainerPort: 3306volumeMounts:- name: mysql-datamountPath: /var/lib/mysqlsubPath: mysql- name: mysql-confmountPath: /etc/mysql/conf.dresources:requests:cpu: 500mmemory: 1GilivenessProbe:exec:command: ["mysqladmin", "ping"]initialDelaySeconds: 30periodSeconds: 10timeoutSeconds: 5readinessProbe:exec:# Check we can execute queries over TCP (skip-networking is off).command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"]initialDelaySeconds: 5periodSeconds: 2timeoutSeconds: 1- name: xtrabackupimage: 192.168.145.28:1603/lego/mysql/twoeo/gcr.io-google-samples-xtrabackup:latestports:- name: xtrabackupcontainerPort: 3307command:- bash- "-c"- |set -excd /var/lib/mysql# Determine binlog position of cloned data, if any.if [[ -f xtrabackup_slave_info && "x$(<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/;$//g' > change_master_to.sql.in# Ignore xtrabackup_binlog_info in this case (it's useless).rm -f xtrabackup_slave_info xtrabackup_binlog_infoelif [[ -f xtrabackup_binlog_info ]]; then# We're cloning directly from primary. Parse binlog position.[[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1rm -f xtrabackup_binlog_info xtrabackup_slave_infoecho "CHANGE MASTER TO MASTER_LOG_FILE='${BASH_REMATCH[1]}',\MASTER_LOG_POS=${BASH_REMATCH[2]}" > change_master_to.sql.infi# Check if we need to complete a clone by starting replication.if [[ -f change_master_to.sql.in ]]; thenecho "Waiting for mysqld to be ready (accepting connections)"until mysql -h 127.0.0.1 -e "SELECT 1"; do sleep 1; doneecho "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.origfi# 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: mysql-datamountPath: /var/lib/mysqlsubPath: mysql- name: mysql-confmountPath: /etc/mysql/conf.dresources:requests:cpu: 100mmemory: 100Mivolumes:- name: mysql-confemptyDir: {}- name: mysql-configmapconfigMap:name: mysql-configmapvolumeClaimTemplates:- metadata:name: mysql-dataspec:accessModes: ["ReadWriteOnce"]resources:requests:storage: 10Gi參考鏈接：
K8S 實戰（六）| 配置 NFS 動態卷提供持久化存儲
K8S 實戰（七）| 有狀態應用之 MySQL 集群
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