为什么要启用gtid?
master端和slave端有延迟
##设置gtid
master slave1 slave2
root@mysql1 \~\]# vim /etc/my.cnf \[root@mysql1 \~\]# cat /etc/my.cnf \[mysqld
datadir=/data/mysql
socket=/data/mysql/mysql.sock
symbolic-links=0
log-bin=mysql-bin
server-id=1
slow_query_log=on
gtid_mode=on
enforce-gtid-consistency=on
root@mysql1 \~\]# /etc/init.d/mysqld restart Shutting down MySQL........ SUCCESS! Starting MySQL........... SUCCESS! \[root@mysql3 \~\]# vim /etc/my.cnf \[root@mysql3 \~\]# cat /etc/my.cnf \[mysqld
datadir=/data/mysql
socket=/data/mysql/mysql.sock
symbolic-links=0
server_id=3
gtid_mode=on
enforce-gtid-consistency=on
root@mysql3 \~\]# systemctl restart mysqld Failed to restart mysqld.service: Unit not found. \[root@mysql3 \~\]# /etc/init.d/mysqld restart Shutting down MySQL.. SUCCESS! Starting MySQL..... SUCCESS! 把slave1也重启一下 \[root@mysql2 \~\]# /etc/init.d/mysqld restart Shutting down MySQL... SUCCESS! Starting MySQL......... SUCCESS! # #看一下master的日志 \[root@mysql1 \~\]# mysql -uroot -predhat 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) mysql\> exit; Bye \[root@mysql1 \~\]# **mysqlbinlog -vv /data/mysql/mysql-bin.000002** /\*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=1\*/; /\*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0\*/; DELIMITER /\*!\*/; # at 4 #240827 11:39:36 server id 1 end_log_pos 123 CRC32 0x1aa93b7f Start: binlog v 4, server v 5.7.44-log created 240827 11:39:36 at startup # Warning: this binlog is either in use or was not closed properly. ROLLBACK/\*!\*/; BINLOG ' eErNZg8BAAAAdwAAAHsAAAABAAQANS43LjQ0LWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAB4Ss1mEzgNAAgAEgAEBAQEEgAAXwAEGggAAAAICAgCAAAACgoKKioAEjQA AX87qRo= '/\*!\*/; # at 123 #240827 11:39:36 server id 1 end_log_pos 154 CRC32 0x7a75cfb5 Previous-GTIDs # \[empty
SET @@SESSION.GTID_NEXT= 'AUTOMATIC'/* added by mysqlbinlog */ /*!*/;
DELIMITER ; #说明已经开启了
End of log file
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;
#重新设定slave：
#1. 在所有从slave上关掉slave
mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)
#2.
mysql> change master to
-> master_host='172.25.254.6',
-> master_user='repl',
-> master_password='redhat',
-> master_auto_position=1
-> ;
Query OK, 0 rows affected, 2 warnings (0.03 sec)
mysql> start slave;
Query OK, 0 rows affected (0.08 sec)
mysql> SHOW SLAVE STATUS\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.25.254.6
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 154 #自动识别到了
Relay_Log_File: mysql2-relay-bin.000002
Relay_Log_Pos: 367
Relay_Master_Log_File: mysql-bin.000002
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
.....略
#slave2也同上，只不过遇到点问题
root@mysql3 \~\]# mysql -uroot -predhat mysql\> stop slave; Query OK, 0 rows affected (0.00 sec) mysql\> change master to -\> master_host='172.25.254.6', -\> master_user='repl', -\> master_password='redhat', -\> master_auto_position=1 -\> ; Query OK, 0 rows affected, 2 warnings (0.01 sec) mysql\> start slave; Query OK, 0 rows affected (0.00 sec) mysql\> SHOW SLAVE STATUS\\G; \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* 1. row \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* Slave_IO_State: Connecting to master Master_Host: 172.25.254.6 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: **Read_Master_Log_Pos: 4** Relay_Log_File: mysql3-relay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: **Slave_IO_Running: Connecting #出现问题，连不上io Slave_SQL_Running: Yes** ...略 mysql\> exit; Bye ##解决 \[root@mysql3 \~\]# ps aux \| grep mysqld root 57157 0.0 0.0 113412 1588 pts/2 S 11:38 0:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/data/mysql --pid-file=/data/mysql/mysql3.pid mysql 57322 0.1 9.1 1144772 170096 pts/2 Sl 11:38 0:07 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=mysql3.err --pid-file=/data/mysql/mysql3.pid --socket=/data/mysql/mysql.sock root 58302 0.0 0.0 112808 968 pts/2 S+ 13:18 0:00 grep --color=auto mysqld \[root@mysql3 \~\]# kill 57322 \[root@mysql3 \~\]# ps aux \| grep mysqld root 58309 0.0 0.0 112808 968 pts/2 R+ 13:19 0:00 grep --color=auto mysqld \[root@mysql3 \~\]# /etc/init.d/mysqld restart ERROR! MySQL server PID file could not be found! Starting MySQL. SUCCESS! \[root@mysql3 \~\]# mysql -uroot -predhat mysql\> show slave status\\G; \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* 1. row \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* Slave_IO_State: Waiting for master to send event Master_Host: 172.25.254.6 Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 **Read_Master_Log_Pos: 154** Relay_Log_File: mysql3-relay-bin.000004 Relay_Log_Pos: 367 Relay_Master_Log_File: mysql-bin.000002 **Slave_IO_Running: Yes Slave_SQL_Running: Yes** ...略 gtid就做好了，用全局的id来对日志就行回放