MoHA 是 Mobike 开源的跨数据中心的 MySQL 集群的高可用（HA）解决方案
MoHA 提供了详细的设计和使用说明文档，点击查看
启动使用
下载项目
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git clone https://gitee.com/piao/moha.git $GOPATH/src/github.com/moiot/moha
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可选择修改配置中的账号密码，下面演示未修改，使用默认值
编译项目
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cd $GOPATH/src/github.com/moiot/moha
make docker-agent
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编译依赖Docker，需要先安装启动Docker
启动集群
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github.com/moiot/moha/etc/docker-compose git:(master) ✗ > docker-compose -f docker-compose.yml up -d
Creating network "docker-compose_default" with the default driver
Creating volume "docker-compose_mysql-node-3-data" with default driver
Creating etcd-node-2 ... done
Creating haproxy-slave ... done
Creating haproxy-master ... done
Creating etcd-node-1 ... done
Creating etcd-node-3 ... done
Creating etcd-node-0 ... done
Creating etcd-node-4 ... done
Creating pmm-server ... done
Creating mysql-node-2 ... done
Creating mysql-node-1 ... done
Creating mysql-node-3 ... done
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查看运行状态
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github.com/moiot/moha/etc/docker-compose git:(master) ✗ > docker-compose -f docker-compose.yml ps
Name Command State Ports
---------------------------------------------------------------------------------------------------------------------------------------------------------------
etcd-node-0 /opt/bitnami/scripts/etcd/ ... Up 0.0.0.0:32768->2379/tcp, 2380/tcp
etcd-node-1 /opt/bitnami/scripts/etcd/ ... Up 0.0.0.0:32769->2379/tcp, 2380/tcp
etcd-node-2 /opt/bitnami/scripts/etcd/ ... Up 0.0.0.0:32770->2379/tcp, 2380/tcp
etcd-node-3 /opt/bitnami/scripts/etcd/ ... Up 0.0.0.0:32771->2379/tcp, 2380/tcp
etcd-node-4 /opt/bitnami/scripts/etcd/ ... Up 0.0.0.0:32772->2379/tcp, 2380/tcp
haproxy-master /docker-entrypoint.sh hapr ... Up 0.0.0.0:5000->5000/tcp, 0.0.0.0:7000->7000/tcp
haproxy-slave /docker-entrypoint.sh hapr ... Up 0.0.0.0:5001->5000/tcp, 0.0.0.0:7001->7000/tcp
mysql-node-1 /agent/supervise Up 0.0.0.0:13307->13306/tcp, 0.0.0.0:3307->3306/tcp
mysql-node-2 /agent/supervise Up 0.0.0.0:13308->13306/tcp, 0.0.0.0:3308->3306/tcp
mysql-node-3 /agent/supervise Up 0.0.0.0:13309->13306/tcp, 0.0.0.0:3309->3306/tcp
pmm-server /opt/entrypoint.sh Up 0.0.0.0:3000->3000/tcp, 443/tcp, 0.0.0.0:8080->80/tcp, 0.0.0.0:8500->8500/tcp, 0.0.0.0:9090->9090/tcp
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浏览器访问监控数据
http://localhost:8080/
查看etcd目录
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> docker exec -it etcd-node-0 /bin/sh -c "etcdctl get / --prefix --keys-only"
/dbproxy/clustername/ks_cfg/nodes/node-test/election/master/id
/dbproxy/clustername/ks_cfg/nodes/node-test/election/master/last_gtid
/dbproxy/clustername/ks_cfg/nodes/node-test/election/master/last_txnid
/dbproxy/clustername/ks_cfg/nodes/node-test/election/master/last_uuid
/dbproxy/clustername/ks_cfg/nodes/node-test/election/master/meta_version
/dbproxy/clustername/ks_cfg/nodes/node-test/election/master/term
/dbproxy/clustername/ks_cfg/nodes/node-test/election/terms/127.0.0.1:3307
/dbproxy/clustername/ks_cfg/nodes/node-test/election/terms/127.0.0.1:3308
/dbproxy/clustername/ks_cfg/nodes/node-test/election/terms/127.0.0.1:3309
/dbproxy/clustername/ks_cfg/nodes/node-test/master
/dbproxy/clustername/ks_cfg/nodes/node-test/slave/127.0.0.1:3307
/dbproxy/clustername/ks_cfg/nodes/node-test/slave/127.0.0.1:3308
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查看mysql集群主节点
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> docker exec -it etcd-node-0 /bin/sh -c "etcdctl get /dbproxy/clustername/ks_cfg/nodes/node-test/master"
/dbproxy/clustername/ks_cfg/nodes/node-test/master
127.0.0.1:3307
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访问mysql集群主节点
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> docker exec -it mysql-node-1 /bin/bash
root@9936e9af59be:/# mysql -umysql_user -pmysql_master_user_pwd
[mysql_user@localhost][checker]> show grants;
+-----------------------------------------------------------------------------------------------------------------------+
| Grants for mysql_user@% |
+-----------------------------------------------------------------------------------------------------------------------+
| GRANT SELECT, INSERT, UPDATE, DELETE, RELOAD, SUPER, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'mysql_user'@'%' |
+-----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
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使用root账号访问mysql集群主节点
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CREATE TABLE IF NOT EXISTS `mo_tbl`(
`id` INT UNSIGNED AUTO_INCREMENT,
`title` VARCHAR(100) NOT NULL,
`author` VARCHAR(40) NOT NULL,
`date` DATE,
PRIMARY KEY ( `id` )
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
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创建数据表并写入数据
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> docker exec -it mysql-node-1 /bin/bash
root@9936e9af59be:/# mysql -uroot -pmaster_root_pwd
[root@localhost][checker]> show grants;
+---------------------------------------------------------------------+
| Grants for root@localhost |
+---------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION |
+---------------------------------------------------------------------+
2 rows in set (0.00 sec)
[root@localhost][checker]> CREATE TABLE IF NOT EXISTS `mo_tbl`(
-> `id` INT UNSIGNED AUTO_INCREMENT,
-> `title` VARCHAR(100) NOT NULL,
-> `author` VARCHAR(40) NOT NULL,
-> `date` DATE,
-> PRIMARY KEY ( `id` )
-> )ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.03 sec)
[root@localhost][checker]> desc mo_tbl;
+--------+------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+--------+------------------+------+-----+---------+----------------+
| id | int(10) unsigned | NO | PRI | NULL | auto_increment |
| title | varchar(100) | NO | | NULL | |
| author | varchar(40) | NO | | NULL | |
| date | date | YES | | NULL | |
+--------+------------------+------+-----+---------+----------------+
4 rows in set (0.02 sec)
[root@localhost][checker]> insert into mo_tbl (title, author, date) values ("test", "piao", "2021-09-04");
Query OK, 1 row affected (0.01 sec)
[root@localhost][checker]> select * from mo_tbl;
+----+-------+--------+------------+
| id | title | author | date |
+----+-------+--------+------------+
| 1 | test | piao | 2021-09-04 |
+----+-------+--------+------------+
1 row in set (0.00 sec)
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参考