MySQL 5.7 Distrib 5.7.8-rc 主从复制的简单配置，备忘

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需要补充 mysql5.7的AA复制了，项目需要。

以前写过5.6的主从复制，但是猛然发现5.7.8的好处，是速度比5.6快，是的，你没看错，不过是ORACLE官方数据说快一倍，也许没有那么快。

有三个主要特点优势比5.6：

1、MySQL 5.7 修改了半同步中主库提交的事务的顺序，after sync 模式避免了幻读发生。
2、MySQL 5.7 半同步增强，增加 rpl_semi_sync_master_wait_slave_count 参数控制主库接收多少个slave 写事务成功反馈才返回成功给客户端。
3、原来有dump thread 发送event和接收slave ack 模式，独立出单独接收slave 返回 ack的进程，提高半同步模式的tps 。

masters上

授予权限：

GRANT ALL PRIVILEGES ON *.* TO 'user'@'118.242.237.108' identified by '123456';
FLUSH PRIVILEGES;

/etc/my.cnf
[mysqld]

user = mysql
log-bin = mysql-bin
server-id = 1
binlog-do-db = dns
binlog-ignore-db = mysql
replicate-do-db = dns
replicate-ignore-db = mysql
log-slave-updates
slave-skip-errors = all
sync_binlog = 1
auto_increment_increment = 2
auto_increment_offset = 1

log_slow_queries = /var/log/mysql-slow.log

>flush logs；

重置主的master状态：

mysql> reset master;

slave上：

GRANT ALL PRIVILEGES ON *.* TO 'user'@'118.242.237.106' identified by '123456';
FLUSH PRIVILEGES;

/etc/my.cnf
[mysqld]

user = mysql
log-bin = mysql-bin
server-id = 2
binlog-do-db = dns
binlog-ignore-db = mysql
replicate-do-db = dns
replicate-ignore-db = mysql
log-slave-updates
slave-skip-errors = all
sync_binlog = 1
auto_increment_increment = 2
auto_increment_offset = 2

配置从服务器Slave：

change master to
master_host='118.242.237.106',
master_user='user',
master_password='123456',
master_log_file='mysql-bin.000001',
master_log_pos=967;

启动从服务器复制功能 Mysql>start slave;

检查从服务器复制功能状态：

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 118.242.237.106
                  Master_User: user
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 1796
               Relay_Log_File: ns2-relay-bin.000008
                Relay_Log_Pos: 320
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: dns
          Replicate_Ignore_DB: mysql
           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: 1796
              Relay_Log_Space: 525
              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: 1
                  Master_UUID: 190e7a4b-5ddf-11e5-9899-005056a19a19
             Master_Info_File: /usr/local/mysql-5.7.8-rc-linux-glibc2.5-x86_64/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           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
         Replicate_Rewrite_DB:
                 Channel_Name:
1 row in set (0.00 sec)

mysql>

Slave_IO及Slave_SQL进程必须正常运行，即YES状态

mysql578

做之前把两边数据库同步一样，复制过去解压覆盖从库。

cd /usr/local/mysql

tar -zcf mysql.slave.tar.gz data/

scp –Pxxxx mysql.slave.tar.gz root@118.242.237.108:/usr/local/mysql

tar -zxvf mysql.slave.tar.gz

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