k8s学习(三十一)K8s部署Mysql高可用集群

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确认安装前已经安装好StorageClass，可参考：https://blog.csdn.net/u011943534/article/details/100887530
1、准备镜像

docker pull mysql:5.7
docker save -o mysql-5.7.tar mysql:5.7

将msyql-5.7.tar拷贝至K8s镜像服务器所在的节点

docker load -i mysql-5.7.tar
docker tag mysql:5.7 172.16.10.190:80/library/mysql:5.7
docker push 172.16.10.190:80/library/mysql:5.7

docker pull ist0ne/xtrabackup:1.0
docker save -o xtrabackup_1.0.tar ist0ne/xtrabackup:1.0

将xtrabackup_1.0.tar拷贝至K8s镜像服务器所在的节点

docker tag ist0ne/xtrabackup:1.0 172.16.10.190:80/library/xtrabackup:1.0
docker push 172.16.10.190:80/library/xtrabackup:1.0

2、创建namespace

kubectl create ns db

3、创建configmap

apiVersion: v1
kind: ConfigMap
metadata:name: mysql-clusternamespace: mysqllabels:app: mysql-cluster
data:master.cnf: |# Apply this config only on the master.[mysqld]log-binlog_bin_trust_function_creators=1lower_case_table_names=1slave.cnf: |# Apply this config only on slaves.[mysqld]super-read-onlylog_bin_trust_function_creators=1

kubectl apply -f mysql-configmap.yaml

4、创建service

---
apiVersion: v1
kind: Service
metadata:name: mysqlnamespace: mysql
spec:ports:- port: 3306targetPort: 3306clusterIP: Noneselector:app: mysql
---
apiVersion: v1
kind: Service
metadata:name: mysql-readnamespace: mysql
spec:type: NodePortports:- port: 3306targetPort: 3306nodePort: 31045selector:app: mysql

kubectl apply -f mysql-services.yaml

5、创建statefulset

apiVersion: apps/v1
kind: StatefulSet
metadata:name: mysqlnamespace: mysql
spec:selector:matchLabels:app: mysqlserviceName: mysqlreplicas: 2template:metadata:labels:app: mysqlspec:imagePullSecrets:- name: harborsecretinitContainers:- name: init-mysqlimage: 172.16.10.190:80/library/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 [[ $ordinal -eq 0 ]]; thencp /mnt/config-map/master.cnf /mnt/conf.d/elsecp /mnt/config-map/slave.cnf /mnt/conf.d/fivolumeMounts:- name: confmountPath: /mnt/conf.d- name: config-mapmountPath: /mnt/config-map- name: clone-mysqlimage: 172.16.10.190:80/library/xtrabackup:1.0command:- bash- "-c"- |set -ex# Skip the clone if data already exists.[[ -d /var/lib/mysql/mysql ]] && exit 0# Skip the clone on master (ordinal index 0).[[ `hostname` =~ -([0-9]+)$ ]] || exit 1ordinal=${BASH_REMATCH[1]}[[ $ordinal -eq 0 ]] && exit 0# Clone data from previous peer.ncat --recv-only mysql-$(($ordinal-1)).mysql 3307 | xbstream -x -C /var/lib/mysql# Prepare the backup.xtrabackup --prepare --target-dir=/var/lib/mysqlvolumeMounts:- name: datamountPath: /var/lib/mysqlsubPath: mysql- name: confmountPath: /etc/mysql/conf.dcontainers:- name: mysqlimage: 172.16.10.190:80/library/mysql:5.7env:- name: MYSQL_ALLOW_EMPTY_PASSWORDvalue: "1"ports:- name: mysqlcontainerPort: 3306volumeMounts:- name: datamountPath: /var/lib/mysqlsubPath: mysql- name: confmountPath: /etc/mysql/conf.dresources:requests:cpu: 500mmemory: 1GilivenessProbe:exec:command: ["mysqladmin", "ping"]initialDelaySeconds: 30periodSeconds: 10timeoutSeconds: 5readinessProbe:exec:# Check we can execute queries over TCP (skip-networking is off).command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"]initialDelaySeconds: 5periodSeconds: 2timeoutSeconds: 1- name: xtrabackupimage: 172.16.10.190:80/library/xtrabackup:1.0ports:- name: xtrabackupcontainerPort: 3307command:- bash- "-c"- |set -excd /var/lib/mysql# Determine binlog position of cloned data, if any.if [[ -f xtrabackup_slave_info && "x$(<xtrabackup_slave_info)" != "x" ]]; then# XtraBackup already generated a partial "CHANGE MASTER TO" query# because we're cloning from an existing slave. (Need to remove the tailing semicolon!)cat xtrabackup_slave_info | sed -E 's/;$//g' > change_master_to.sql.in# Ignore xtrabackup_binlog_info in this case (it's useless).rm -f xtrabackup_slave_info xtrabackup_binlog_infoelif [[ -f xtrabackup_binlog_info ]]; then# We're cloning directly from master. Parse binlog position.[[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || 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: datamountPath: /var/lib/mysqlsubPath: mysql- name: confmountPath: /etc/mysql/conf.dresources:requests:cpu: 100mmemory: 100Mivolumes:- name: confemptyDir: {}- name: config-mapconfigMap:name: mysql-clustervolumeClaimTemplates:- metadata:name: dataannotations:volume.beta.kubernetes.io/storage-class: "course-nfs-storage"spec:accessModes: ["ReadWriteOnce"]resources:requests:storage: 10Gi