环境
| 主机名 | 机器IP |
|---|---|
| 10.0.102.214 | node1 |
| 10.0.102.220 | node2 |
| 10.0.102.116 | node3 |
部署
compose-mariadb.yaml文件说明
[root@k8s-node-1 ~]# vim compose-mariadb.yaml
version: '3'
services:
mariadb_galera0: #名称修改下便于区别，各个节点不同
image: severalnines/mariadb:10.1 #镜像
ports:
- "3306:3306" #各个节点访问端口
environment: #环境变量
CLUSTER_NAME: "mariadb-cluster-new" #定义mariadb集群名称
DISCOVERY_SERVICE: "10.0.102.214:2379,10.0.102.175:2379,10.0.102.191:2379"
MYSQL_ROOT_PASSWORD: "mypassword123"
XTRABACKUP_PASSWORD: "mypassword123"
command: #容器启动参数
- --innodb_buffer_pool_size=256M
- --max_connections=81
healthcheck:
interval: 5s
timeout: 3s
retries: 200 # interval * retries > SST duration
volumes:
- /data:/var/lib/mysql #各个节点的挂载目录，预先创好
- /etc/my.cnf.d:/etc/my.cnf.d #是否开通binlog配置好,放此目录
- /etc/localtime:/etc/localtime #定义时区
network_mode: "host" #使用本机网络
【见图1】
1.png
k8s-node-1
部署：
创建挂载所需目录与文件
mkdir /data/
mkdir /etc/my.cnf.d
[root@10-0-102-165 ~]# vim /etc/my.cnf.d/bin-log.cnf
[mysqld]
log-bin= mysql-bin
log_slave_updates = 1
expire_logs_days = 20
server-id = 211
执行docker-compose命令进行部署(部署新集群时确保/data目录为空)
[root@10-0-102-165 ~]# rm -rf /data/*
[root@10-0-102-165 ~]# docker-compose -f compose-mariadb.yaml up -d
Creating root_mariadb_galera0_1 ... done
【见图2】
查询容器启动日志
# docker logs -f $(dockerps -a | grep 'severalnines/mariadb:10.1' |awk '{print $NF}')
验证容器是否启动及集群状态
mysql -uroot -pmypassword123 -h10.0.102.165
MariaDB [(none)]> show status like 'wsrep%';
【见图3】
2.png
3.png
k8s-node-2
创建挂载所需目录与文件
#mkdir /data/
#mkdir /etc/my.cnf.d #不开通binlog只创建目录即可
启动容器
# rm -rf /data/*
# docker-compose -f compose-mariadb.yaml up -d
Creating root_mariadb_galera1_1 ... done
# docker logs -f $(dockerps -a | grep 'severalnines/mariadb:10.1' |awk '{print $NF}')
【见图4】
验证
mysql -uroot -pmypassword123 -h 10.0.102.165 -e "show status like 'wsrep%';"
可以发现节点2的ip已经加入到mariadb集群中，只等第三个节点了
【见图5】
4.png
5.png
k8s-node-3
创建挂载所需目录与文件
mkdir /data/
mkdir /etc/my.cnf.d #不开通binlog只创建目录即可
2.启动容器
# rm -rf /data/*
# docker-compose -f compose-mariadb.yaml up -d
Creating root_mariadb_galera1_1 ... done
# docker logs -f $(dockerps -a | grep 'severalnines/mariadb:10.1' |awk '{print $NF}')
【见图6】
3.验证
mysql -uroot -pmypassword123 -h 10.0.102.165 -e "show status like 'wsrep%';"
【见图7】
6.png
7.png
注意事项
1.扩容
扩容比较简单，只需copy一份compose文件，简单修改名称即可，创建相应的目录，使用docker-compose -f 文件名 up –d即可，请确保启动前/data目录为空2.缩容
缩容时，先使用docker stop NF}')停止容器，然后使用dockerrmNF}')删除退出的容器即可3.集群启动与停止时请按照顺序执行，不可并行，而且停止时建议使用docker stop命令
4.某个节点异常后重新加入集群需要停止服务并清空/data目录再使用docker-compose，请确保compose文件中集群信息的配置与集群相符合
5备份恢复操作与k8s中mariadb集群的备份恢复操作相同
五、配置文件（对应各个节点，在相应节点运行）
yaml文件
compose-mariadb1.yaml
version: '3'
services:
mariadb_galera0:
image: severalnines/mariadb:10.1
ports:
- "3306:3306"
environment:
CLUSTER_NAME: "mariadb-cluster-new"
DISCOVERY_SERVICE: "10.0.102.214:2379,10.0.102.175:2379,10.0.102.191:2379"
MYSQL_ROOT_PASSWORD: "mypassword123"
XTRABACKUP_PASSWORD: "mypassword123"
command:
- --innodb_buffer_pool_size=256M
- --max_connections=81
healthcheck:
interval: 5s
timeout: 3s
retries: 200 # interval * retries > SST duration
volumes:
- /data:/var/lib/mysql
- /etc/my.cnf.d:/etc/my.cnf.d
- /etc/localtime:/etc/localtime
network_mode: "host"
compose-mariadb2.yaml
version: '3'
services:
mariadb_galera1:
image: severalnines/mariadb:10.1
ports:
- "3306:3306"
- "4567:4567"
environment:
CLUSTER_NAME: "mariadb-cluster-new"
DISCOVERY_SERVICE: "10.0.102.214:2379,10.0.102.175:2379,10.0.102.191:2379"
MYSQL_ROOT_PASSWORD: "mypassword123"
XTRABACKUP_PASSWORD: "mypassword123"
command:
- --innodb_buffer_pool_size=256M
- --max_connections=81
healthcheck:
interval: 8s
timeout: 3s
retries: 300 # interval * retries > SST duration
volumes:
- /data:/var/lib/mysql
- /etc/my.cnf.d:/etc/my.cnf.d
- /etc/localtime:/etc/localtime
compose-mariadb3.yaml
version: '3'
services:
mariadb_galera2:
image: severalnines/mariadb:10.1
ports:
- "3306:3306"
- "4567:4567"
environment:
CLUSTER_NAME: "mariadb-cluster-new"
DISCOVERY_SERVICE: "10.0.102.214:2379,10.0.102.175:2379,10.0.102.191:2379"
MYSQL_ROOT_PASSWORD: "mypassword123"
XTRABACKUP_PASSWORD: "mypassword123"
command:
- --innodb_buffer_pool_size=256M
- --max_connections=81
healthcheck:
interval: 5s
timeout: 3s
retries: 200 # interval * retries > SST duration
volumes:
- /data:/var/lib/mysql
- /etc/my.cnf.d:/etc/my.cnf.d
- /etc/localtime:/etc/localtime
network_mode: host