1.2 .主从同步搭建
注意：防火墙需要关闭
创建复制账号（master、slave1(mha新主)）
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.127.%' IDENTIFIED BY 'repl';
flush privileges;
查看master binlog POS点信息
root@(none) 06:47:05>show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000004 | 409 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.01 sec)
建立主从复制（slave01、slave02）
[root@slave01 ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.6.27-75.0-log Percona Server (GPL), Release 75.0, Revision 8bb53b6
Copyright (c) 2009-2015 Percona LLC and/or its affiliates
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
root@(none) 07:03:39>CHANGE MASTER TO MASTER_HOST='192.168.127.101',MASTER_PORT=3306,MASTER_USER='repl',MASTER_PASSWORD='repl',MASTER_LOG_FILE='mysql-bin.000004',MASTER_LOG_POS=409;
Query OK, 0 rows affected, 2 warnings (0.05 sec)
root@(none) 07:03:41>start slave;
Query OK, 0 rows affected (0.02 sec)
查看主从复制
root@(none) 07:03:42>show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.127.101
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000004
Read_Master_Log_Pos: 409
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000004
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 409
Relay_Log_Space: 457
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 101
Master_UUID: 8b1cf62d-e063-11e5-84ba-000c2908253f
Master_Info_File: /data/mysql3306/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.02 sec)
ERROR:
No query specified
以上主从已经搭建好，下面我们安装与配置MHA
（1）slave服务器(192.168.127.102,192.168.103)设置read only;
mysql> set global read_only=1;
（2）设置relay log清除方式（在每个slave 下）
mysql> set global relay_log_purge=0;
(3)创建监控用户,在所有MYSQL上执行
mysql> grant all privileges on *.* to 'root'@'192.168.127.%' identified by '123456';
mysql>flush privileges;
（4）在slave01(192.168.127.102)上创建复制用户：
mysql> grant replication slave on *.* to 'repl'@'192.168.127.%' identified by 'repl';
mysql>flush privileges;
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