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。

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--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，欢迎关注创新互联行业资讯频道，感谢各位的阅读！

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