mysql 5.7 搭建基本的 master/salve

os: centos 7.4
db: mysql 5.7

安装好一台虚拟机，安装好mysql，然后克隆好另外一台虚拟机

centos74_mysql5.7         192.168.56.100  
centos74_mysql5.7_slave   192.168.56.200

master端操作

my.cnf 参考另一篇blog

create user 'replicator'@'192.168.56.%' identified by 'mysqlmysql';
grant replication slave on *.* to 'replicator'@'192.168.56.%';
flush privileges;
show master status\G

既有MYISAM又有INNODB的话就在主服务器上使用如下命令导出服务器的一个快照：

mysqldump -uroot -p --lock-tables --events --triggers --routines --flush-logs --master-data=2 --databases peiybdb1 > /tmp/db.sql

只有INNODB的话就是用如下命令：

mysqldump -uroot -p --single-transaction --events --triggers --routines --flush-logs --master-data=2 --databases peiybdb1 > /tmp/db.sql

这里需要注意几个参数的使用：
–single-transaction 这个参数只对innodb适用。
–databases 后面跟除mysql以后的其他所有数据库的库名，我这里只有一个test库。
–master-data 参数会记录导出快照时候的mysql二进制日志位置，一会会用到。

slave端操作

my.cnf 参考另一篇blog

初始化数据库

# /usr/local/mysql/bin/mysqld --initialize --user=mysql --basedir=/usr/local/mysql/ --datadir=/var/lib/mysql/ 

使用grep命令查找到二进制日志的名称以及位置

# grep -i "change master" /tmp/db.sql

导入sql文件

# mysql -hlocalhost -uroot -p peiybdb1 < /tmp/db.sql

show slave status\G
stop slave;

change master to
  master_host='192.168.56.100',
  master_user='replicator',
  master_password='mysqlmysql',
  master_port=3306,
  master_log_file='mysql-bin.000141',
  master_log_pos=154,
  master_connect_retry=10;

start slave\G  
show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.56.100
                  Master_User: replicator
                  Master_Port: 3306
                Connect_Retry: 10
              Master_Log_File: mysql-bin.000141
          Read_Master_Log_Pos: 322
               Relay_Log_File: mysql-relay-bin.000006
                Relay_Log_Pos: 488
        Relay_Master_Log_File: mysql-bin.000141
             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: 322
              Relay_Log_Space: 695
              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: 73b494ef-30dd-11e8-a80f-0800273d32a4
             Master_Info_File: /var/lib/mysql/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: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

查看Slave_IO_Running和Slave_SQL_Running的状态，如果都为Yes，那么就成功了。