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@ -208,19 +208,310 @@ $(pod name).$(service name).$(namespace).svc.cluster.local
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## 二：案例
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#### 1.利用Statefulset构建Mysql主从集群
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准备工作：
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NFS共享存储为Kubernetes集群提供持久化存储
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配置Kubernetes集群链接企业私有Harbor仓库
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Kubernetes集群安装NFS插件Provisioner,利用NFS存储在Kubernetes集群创建StorageClass使用
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注意：
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部署NFS插件Provisioner方式
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Kuboard方式
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yaml文件方式（见新文档）
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##### 创建共享目录
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略 共享目录为 /data/ha-mysql
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##### 创建命名空间
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```shell
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[root@xingdiancloud-native-master-a mysql]# kubectl create ns mysql
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```
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##### 创建存储类
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##### 创建ConfigMap
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Kuboard方式
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Yaml文件方式
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```yaml
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[root@xingdiancloud-native-master-a mysql]# cat 01-configmap.yaml
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apiVersion: v1
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kind: ConfigMap
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metadata:
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namespace: mysql
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name: mysql
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labels:
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app: mysql
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data:
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master.cnf: |
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[mysqld]
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log-bin
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log_bin_trust_function_creators=1
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lower_case_table_names=1
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slave.cnf: |
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[mysqld]
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super-read-only
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log_bin_trust_function_creators=1
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[root@xingdiancloud-native-master-a mysql]# kubectl apply -f 01-configmap.yaml
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```
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##### 创建Service
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Kuboard方式：略
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Yaml文件方式
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```yaml
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[root@xingdiancloud-native-master-a mysql]# cat 02-service.yaml
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# Headless service for stable DNS entries of StatefulSet members.
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apiVersion: v1
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kind: Service
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metadata:
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namespace: mysql
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name: mysql
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labels:
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app: mysql
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spec:
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ports:
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- name: mysql
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port: 3306
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clusterIP: None
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selector:
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app: mysql
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---
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# Client service for connecting to any MySQL instance for reads.
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# For writes, you must instead connect to the master: mysql-0.mysql.
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apiVersion: v1
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kind: Service
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metadata:
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namespace: mysql
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name: mysql-read
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labels:
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app: mysql
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spec:
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ports:
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- name: mysql
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port: 3306
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selector:
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app: mysql
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[root@xingdiancloud-native-master-a mysql]# kubectl apply -f 02-service.yaml
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```
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##### 创建StatefulSet控制器
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```yaml
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[root@xingdiancloud-native-master-a mysql]# cat 03-statefulset.yaml
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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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namespace: 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: swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/mysql:5.7.26
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env:
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- name: TZ
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value: Asia/Shanghai
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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 [[ $ordinal -eq 0 ]]; then
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cp /mnt/config-map/master.cnf /mnt/conf.d/
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else
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cp /mnt/config-map/slave.cnf /mnt/conf.d/
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fi
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volumeMounts:
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- name: conf
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mountPath: /mnt/conf.d
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- name: config-map
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mountPath: /mnt/config-map
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- name: clone-mysql
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image: swr.cn-north-4.myhuaweicloud.com/ddn-k8s/gcr.io/google-samples/xtrabackup:1.0
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env:
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- name: TZ
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value: Asia/Shanghai
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command:
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- bash
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- "-c"
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- |
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set -ex
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# Skip the clone if data already exists.
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[[ -d /var/lib/mysql/mysql ]] && exit 0
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# Skip the clone on master (ordinal index 0).
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[[ `hostname` =~ -([0-9]+)$ ]] || 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: swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/mysql:5.7.26
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env:
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- name: MYSQL_ALLOW_EMPTY_PASSWORD
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value: "1"
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- name: TZ
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value: Asia/Shanghai
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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: swr.cn-north-4.myhuaweicloud.com/ddn-k8s/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 ]]; 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 slave.
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mv xtrabackup_slave_info 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_binlog_info
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elif [[ -f xtrabackup_binlog_info ]]; then
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# We're cloning directly from master. Parse binlog position.
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[[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
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rm xtrabackup_binlog_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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# 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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mysql -h 127.0.0.1 <<EOF
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$(<change_master_to.sql.orig),
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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;
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EOF
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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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storageClassName: mysql
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resources:
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requests:
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storage: 1Gi
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[root@xingdiancloud-native-master-a mysql]# kubectl apply -f 03-statefulset.yaml
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```
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##### 验证集群状态
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注意：因服务运行需要时间，需要耐心等待一段时间后在验证，验证的结果如下
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```shell
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[root@xingdiancloud-native-master-a mysql]# kubectl get pod -n mysql
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NAME READY STATUS RESTARTS AGE
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mysql-0 2/2 Running 0 37m
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mysql-1 2/2 Running 0 38m
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mysql-2 2/2 Running 0 39m
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```
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