the scenario of automatic replication health monitoring and failover

2. 2/8
 能夠有效監控主從複製的狀態，並能自動failover，達到
主從架構的高可用性。

3. 3/8
 主從複製+mysqlfailover utility
 Master DB Server:10.144.150.159:3802
 Slave1 DB Server: 10.144.150.157:3804
 Slave2 DB Server: 10.144.150.158:3801
 mysqlfailover utility :10.144.150.177
Master
DB
Slave 2
Slave 1
mysqlfailover
utility
Replication
Replication

4. 4/8
 適用版本
 MySQL 5.6.5以後
 需安裝mysql-connector-python, mysql-utilities
 mysql-connector-python-2.1.3-1.el6.x86_64.rpm
 mysql-utilities-1.5.6-1.el6.noarch.rpm
 主從伺服器需打開GTID設定

5. 5/8
 建立mysqlutil帳號在所有主從DB上，作為replication
與failover用途
 帳號其host IP 需明確指定
 需開放的權限如下:
GRANT SELECT, INSERT, CREATE, DROP, RELOAD, SUPER, REPLICATION SLAVE
ON *.* TO 'mysqlutil'@'10.144.150.157'

6. 6/8
 啟動mysqlfailover 監控主從複製狀態
 mysqlfailover --master=mysqlutil:mysql@10.144.150.159:3802 --discover-slaves-
login=mysqlutil:mysql --force

7. 7/8
 關閉Master DB(10.144.150.159:3802)服務，驗證其
auto failover與主從複製切換

8. 8/8
 將原來的Master DB(10.144.150.159:3802)啟動服務，
手動對新提升的Master(10.144.150.157:3804)進行主
從複製。
 mysql> change master to master_host='10.144.150.157', master_port=3804,
master_user='mysqlutil', master_password='mysql', master_auto_position=1;
 建立起新的主從複製