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MySQL 5.5 主主复制搭建过程是怎样的，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
– 节点 1 IP 192.168.78.141 PORT 3306
– 节点 2 IP 192.168.78.137 PORT 5505
– 配置节点 1 到节点 2 的复制
– 编辑节点 1 的配置文件
[root@localhost install]# vim /etc/my.cnf
# Log
server-id = 100
log-bin = /log/binlog/mysql-bin
– 在节点 2 安装好 MySQL 软件，安装流程可以参考源码安装文章
http://blog.itpub.net/26506993/viewspace-2072859/
– 在节点 1，使用 Xtrabackup 创建完整备份
关于 Xtrabackup，可参考
http://blog.itpub.net/26506993/viewspace-2087734/
http://blog.itpub.net/26506993/viewspace-2088737/
[root@localhost backup]# /install/percona/percona-xtrabackup-2.4.2-Linux-x86_64/bin/innobackupex –defaults-file=/etc/my.cnf –stream=tar /tmp –user system –password Mysql#2015 | gzip –
/backup/xtra/xtra_fullbackup_20160501.tar.gz
– 拷贝备份到节点 2
[root@localhost backup]# scp /backup/xtra/xtra_fullbackup_20160501.tar.gz root@192.168.78.137:/backup/20160501
解压备份到数据文件目录
[root@localhost 5505]# tar xivfz xtra_fullbackup_20160501.tar.gz -C /mysql_data/5505
在节点 2 上面需要安装 Xtraback
– 使用 Xtrabackup 准备数据、应用日志，使数据文件达到一致性的状态
[root@localhost bin]# ./innobackupex –defaults-file=/mysql_data/cnf/my.cnf –apply-log /mysql_data/5505
…..
InnoDB: Doing recovery: scanned up to log sequence number 68405269 (0%)
InnoDB: Doing recovery: scanned up to log sequence number 68405269 (0%)
InnoDB: Database was not shutdown normally!
InnoDB: Starting crash recovery.
InnoDB: xtrabackup: Last MySQL binlog file position 414, file name /log/binlog/mysql-bin.000012
InnoDB: Removed temporary tablespace data file: ibtmp1
InnoDB: Creating shared tablespace for temporary tables
InnoDB: Setting file ./ibtmp1 size to 12 MB. Physically writing the file full; Please wait …
InnoDB: File ./ibtmp1 size is now 12 MB.
InnoDB: 96 redo rollback segment(s) found. 1 redo rollback segment(s) are active.
InnoDB: 32 non-redo rollback segment(s) are active.
InnoDB: 5.7.11 started; log sequence number 68405269
xtrabackup: starting shutdown with innodb_fast_shutdown = 1
InnoDB: FTS optimize thread exiting.
InnoDB: Starting shutdown…
InnoDB: Shutdown completed; log sequence number 68405621
160430 23:51:25 completed OK!
– 在节点 1 数据库上面创建复制专用账户
mysql grant replication slave on *.* to repl @ 192.168.78.% identified by Mysql#2015
Query OK, 0 rows affected (0.04 sec)
– 配置节点 2 的配置文件
[root@localhost 5505]# vim /mysql_data/cnf/my.cnf
# Log
server-id = 200
log-bin = /mysql_log/binlog/mysql-bin
relay-log = /mysql_log/binlog/product-relay-bin
relay-log-index = /mysql_log/binlog/product-relay-index
binlog_cache_size = 32M
max_binlog_cache_size = 512M
max_binlog_size = 512M
binlog_format = MIXED
– 启动节点 2 的 Mysql 服务
[root@localhost bin]# /data/bin/mysqld_safe –defaults-file=/mysql_data/cnf/my.cnf
– 配置 Slave 节点复制环境
查询 Slave 节点连接 Master 节点的二进制文件和位置
使用 Xtrabackup 备份时，在 xtrabackup_binlog_info 文件中会保存这部分信息
[root@localhost 5505]# more xtrabackup_binlog_info
mysql-bin.000012 414
– 在节点 2 执行 CHANGE MASTER 语句
mysql change master to
– master_host= 192.168.78.141 ,
– master_port=3306,
– master_user= repl ,
– master_password= Mysql#2015 ,
– master_log_file= mysql-bin.000012 ,
– master_log_pos=414;
Query OK, 0 rows affected (0.13 sec)
– 启动应用线程
mysql start slave;
– 查看同步状态
mysql show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.78.141
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000013
Read_Master_Log_Pos: 341
Relay_Log_File: product-relay-bin.000003
Relay_Log_Pos: 487
Relay_Master_Log_File: mysql-bin.000013
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
– 搭建节点 2 到节点 1 的复制
– 在节店 1 的配置文件中，增加中继日志的设置
[root@localhost log]# vim /etc/my.cnf
relay-log = /log/binlog/product-relay-bin
relay-log-index = /log/binlog/product-relay-index
– 重启节点 1 的数据库
[root@localhost tmp]# /software/bin/mysqladmin -usystem -p system shutdown
160512 02:47:54 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
[1]+ Done /software/bin/mysqld_safe –defaults-file=/etc/my.cnf (wd: ~)
(wd now: /tmp)
[root@localhost tmp]# /software/bin/mysqld_safe –defaults-file=/etc/my.cnf
[1] 40246
[root@localhost tmp]# 160512 02:48:13 mysqld_safe Logging to /log/err.log .
160512 02:48:13 mysqld_safe Starting mysqld daemon with databases from /data
mysql show variables like relay_log%
+———————–+———————————+
| Variable_name | Value |
+———————–+———————————+
| relay_log | /log/binlog/product-relay-bin |
| relay_log_index | /log/binlog/product-relay-index |
| relay_log_info_file | relay-log.info |
| relay_log_purge | ON |
| relay_log_recovery | OFF |
| relay_log_space_limit | 0 |
+———————–+———————————+
6 rows in set (0.00 sec)
– 在节点 1 上面增加全局只读锁，如果应用只连接到一个节点，如节点 1，这一步可以忽略
mysql flush tables with read lock;
Query OK, 0 rows affected (0.00 sec)
– 查看节点 2 当前的日志名称和位置，用于下面在节点 1 的 change master to 命令
mysql show master status;
+——————+———-+————–+——————+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+——————+———-+————–+——————+
| mysql-bin.000006 | 14078491 | | |
+——————+———-+————–+——————+
1 row in set (0.00 sec)
– 在节点 1 执行 CHANGE MASTER 语句
mysql change master to
– master_host= 192.168.78.137 ,
– master_port=5505,
– master_user= repl ,
– master_password= Mysql#2015 ,
– master_log_file= mysql-bin.000006 ,
– master_log_pos=14078491;
Query OK, 0 rows affected (0.13 sec)
– 启动应用线程
mysql start slave;
– 节点 1 释放全局只读锁
mysql unlock tables;
Query OK, 0 rows affected (0.00 sec)
– 查看同步状态
mysql show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.78.137
Master_User: repl
Master_Port: 5505
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 14078491
Relay_Log_File: product-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
在两个节点的配置文件中增加序列的相关参数，以避免生成的序列相同而产生冲突
– 节点 1
节点 1 上序列从 1 开始，增长值为 2，即为奇数，如 1、3、5
## set this to server-id value
auto_increment_offset = 1
## set this to the number of mysql servers
auto_increment_increment = 2
– 节点 2
节点 2 上序列从 2 开始，增长值为 2，即为奇数，如 2、4、6
## set this to server-id value
auto_increment_offset = 2
## set this to the number of mysql servers
auto_increment_increment = 2
看完上述内容，你们掌握 MySQL 5.5 主主复制搭建过程是怎样的的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注丸趣 TV 行业资讯频道，感谢各位的阅读！
