mysq5.7 主主同步

db01  172.21.0.10

db02  172.21.0.14

一、安装数据库看上一遍博客

修改配置文件  db01  172.21.0.10

[root@VM_0_10_centos mysql]# cat /etc/my.cnf
[mysqld]
port=3306
character-set-server=utf8
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
#innodb_buffer_pool_size=8M
max_connections=1000
slow_query_log = 1
slow_query_log_file=/usr/local/mysql/log/mysql_slow_query.log
long_query_time = 5
max_connections=1000

log-bin=/usr/local/mysql/log_bin/mysql-bin.log  # 开启二进制日志
binlog_format=mixed
server-id = 1
auto_increment_increment=2 # 步进值auto_imcrement。一般有n台主 MySQL 就填n
auto_increment_offset=1 # 起始值。一般填第n台主MySQL。此时为第一台主MySQL
replicate-do-db=schneider # 要同步的数据库，默认所有库
expire_logs_days=180  #binlog过期清理时间
max_binlog_size=512m  #binlog每个日志文件大小
replicate-do-db=schneider # 要同步的数据库，默认所有库

[mysqld_safe]

log-error=/usr/local/mysql/data/error.log

pid-file=/usr/local/mysql/data/mysql.pid

tmpdir=/usr/local/mysql/tmp

[client]
default-character-set=utf8
[mysql]
default-character-set=utf8

　修改配置文件  db01  172.21.0.14

[root@VM_0_14_centos log_bin]# cat /etc/my.cnf
[mysqld]
port=3306
character-set-server=utf8
basedir=/usr/local/mysql
datadir=/usr/local/mysql/data
#innodb_buffer_pool_size=8M
max_connections=1000
slow_query_log = 1
slow_query_log_file=/usr/local/mysql/log/mysql_slow_query.log
long_query_time = 5
max_connections=1000

log-bin=/usr/local/mysql/log_bin/mysql-bin.log  # 开启二进制日志
binlog_format=mixed
server-id = 2 #id 不能一样
auto_increment_increment=2 # 步进值auto_imcrement。一般有n台主 MySQL 就填n
auto_increment_offset=2 # 起始值。一般填第n台主MySQL。此时为第一台主MySQL
replicate-do-db=schneider # 要同步的数据库，默认所有库
expire_logs_days=180  #binlog过期清理时间
max_binlog_size=512m  #binlog每个日志文件大小
replicate-do-db=schneider # 要同步的数据库，默认所有库

[mysqld_safe]

log-error=/usr/local/mysql/data/error.log

pid-file=/usr/local/mysql/data/mysql.pid

tmpdir=/usr/local/mysql/tmp

[client]
default-character-set=utf8
[mysql]
default-character-set=utf8

二、互换主从 注意需要锁表 或者停库

　db01  172.21.0.10

# 创建用户 并授权
 CREATE USER 'mysq114'@'172.21.0.14' IDENTIFIED BY '123456';
 GRANT REPLICATION SLAVE ON *.* TO 'mysq114'@'172.21.0.14' IDENTIFIED BY '123456';
FLUSH PRIVILEGES;

mysql>  show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |      154 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

# 告诉bin-log位置  在db02  172.21.0.14 执行

CHANGE MASTER TO
MASTER_HOST='172.21.0.10',
MASTER_USER='mysq114',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='mysql-bin.000003',
MASTER_LOG_POS= 154;　

db02  172.21.0.14　

 CREATE USER 'mysql10'@'172.21.0.10' IDENTIFIED BY '123456';
 GRANT REPLICATION SLAVE ON *.* TO 'mysql10'@'172.21.0.10' IDENTIFIED BY '123456';
 FLUSH PRIVILEGES;

mysql>  show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 |      154 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

　# 告诉bin-log位置  在db01  172.21.0.10 执行　

 CHANGE MASTER TO
MASTER_HOST='172.21.0.14',
MASTER_USER='mysql10',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='mysql-bin.000003',
MASTER_LOG_POS= 154;

三、查看结果　

db1 和db2 都执行
 start slave;

　db01  172.21.0.10

mysql>  show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.21.0.14
                  Master_User: mysql10
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000004
          Read_Master_Log_Pos: 474
               Relay_Log_File: VM_0_10_centos-relay-bin.000006
                Relay_Log_Pos: 687
        Relay_Master_Log_File: mysql-bin.000004
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: schneider
          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: 474
              Relay_Log_Space: 1069
              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: 2
                  Master_UUID: 9e57cecc-d148-11e9-92db-5254007bbb3c
             Master_Info_File: /data/mysql/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:
           Master_TLS_Version:
1 row in set (0.00 sec)

　db02  172.21.0.14

mysql>  show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.21.0.10
                  Master_User: mysq114
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000004
          Read_Master_Log_Pos: 355
               Relay_Log_File: VM_0_14_centos-relay-bin.000005
                Relay_Log_Pos: 568
        Relay_Master_Log_File: mysql-bin.000004
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: schneider
          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: 355
              Relay_Log_Space: 950
              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: 9a3346c4-d148-11e9-a4f1-525400857720
             Master_Info_File: /data/mysql/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:
           Master_TLS_Version:
1 row in set (0.00 sec)

　四、最后测试是否同步