MySQL 5.5级联复制配置的示例分析

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这篇文章主要介绍 MySQL 5.5 级联复制配置的示例分析，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

如下图，A 节点是 B 节点的 Master，B 节点是 C 节点的 Master
A – B – C

在已有的 A – B 复制环境中，添加级联 slave 节点 C
– 各节点 IP 如下
A 192.168.78.141
B 192.168.78.137
C 192.168.78.135

A – B 复制配置流程，请参考文章
http://blog.itpub.net/26506993/viewspace-2091601/

– 在节点 B 上，增加下面参数后，重启 MySQL 数据库服务
–log-slave-updates

通常，在 Mysql 复制环境中，slave 节点不会将从主节点接收的数据更新写入到它的二进制日志中。这个参数将会使 SQL 线程在应用日志的时候将相关变更记录到它自己的二进制日志中。

[root@localhost 5505]# vim /mysql_data/cnf/my.cnf
[mysqld]
# Replication
log-slave-updates

– 节点 B，重启 Mysql 服务
[root@localhost bin]# /data/bin/mysqladmin -usystem -p Mysql#2015 shutdown
160502 19:36:01 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
[1]+ Done /data/bin/mysqld_safe –defaults-file=/mysql_data/cnf/my.cnf
[root@localhost bin]# /data/bin/mysqld_safe –defaults-file=/mysql_data/cnf/my.cnf
[1] 57552
[root@localhost bin]# 160502 19:36:13 mysqld_safe Logging to /mysql_log/err.log .
160502 19:36:13 mysqld_safe Starting mysqld daemon with databases from /mysql_data/5505

– 节点 B，停止 sql_thread 线程
mysql stop slave sql_thread;
Query OK, 0 rows affected (0.03 sec)

– 配置 B – C 的复制环境

– 在 C 节点，安装好 Mysql 数据库软件

– 创建数据文件目录
[root@localhost 70005]# mkdir -p /mysql_data/70005

– 创建配置文件的目录
[root@localhost 70005]# mkdir -p /mysql_data/cnf/

– 创建日志文件所在目录
[root@localhost ~]# mkdir -p /mysql_log/binlog
[root@localhost ~]# mkdir -p /mysql_log/innodb
[root@localhost ~]# chown -R mysql.mysql /mysql_log/

– 在 B 节点，使用 Xtrabackup 创建完整备份
[root@localhost percona-xtrabackup-2.4.2-Linux-x86_64]# ./bin/innobackupex –defaults-file=/mysql_data/cnf/my.cnf –stream=tar /tmp –user system –password Mysql#2015 | gzip –
/backup/xtra_fullbackup_20160503.tar.gz

– 拷贝备份和配置文件到 C 节点
[root@localhost backup]# scp /backup/xtra_fullbackup_20160503.tar.gz root@192.168.78.135:/backup/20160503
[root@localhost percona-xtrabackup-2.4.2-Linux-x86_64]# scp /mysql_data/cnf/my.cnf root@192.168.78.135:/mysql_data/cnf/

–C 节点，解压备份到数据文件目录
[root@localhost 5505]# tar xivfz /backup/20160503/xtra_fullbackup_20160503.tar.gz -C /mysql_data/70005
[root@localhost ~]# chown -R mysql.mysql /mysql_data/

– 在 C 节点上面需要安装 Xtraback，可参看文章
http://blog.itpub.net/26506993/viewspace-2087734/
http://blog.itpub.net/26506993/viewspace-2088737/

– 节点 C，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/70005
…..
InnoDB: Log scan progressed past the checkpoint lsn 68409356
InnoDB: Doing recovery: scanned up to log sequence number 68409365 (0%)
InnoDB: Doing recovery: scanned up to log sequence number 68409365 (0%)
InnoDB: Database was not shutdown normally!
InnoDB: Starting crash recovery.
InnoDB: xtrabackup: Last MySQL binlog file position 823, file name /mysql_log/binlog/mysql-bin.000002
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 68409365
xtrabackup: starting shutdown with innodb_fast_shutdown = 1
InnoDB: FTS optimize thread exiting.
InnoDB: Starting shutdown…
InnoDB: Shutdown completed; log sequence number 68409384
160502 20:41:13 completed OK!

– 节点 B，在 Master 节点 B 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)

– 节点 C，配置 Slave 节点 C 的配置文件
[root@localhost bin]# vim /mysql_data/cnf/my.cnf
# Log
server-id = 50005
log-bin = /mysql_log/binlog/product-node3-mysql-bin
relay-log = /mysql_log/binlog/product-node3-relay-bin
relay-log-index = /mysql_log/binlog/product-node3-relay-index
binlog_cache_size = 32M
max_binlog_cache_size = 512M
max_binlog_size = 512M
binlog_format = MIXED

– 节点 C，启动 Slave 节点的 Mysql 服务
[root@localhost bin]# /software/bin/mysqld_safe –defaults-file=/mysql_data/cnf/my.cnf

– 节点 C，配置 Slave 节点复制环境
– 节点 C，在 Slave 节点执行 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.000005 ,
– master_log_pos=107;

– 节点 C，启动应用线程
mysql start slave;

– 节点 C，查看应用状态
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.000005
Read_Master_Log_Pos: 107
Relay_Log_File: product-node3-relay-bin.000002
Relay_Log_Pos: 253
Relay_Master_Log_File: mysql-bin.000005
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

– 启动节点 B 的 SQL 线程
mysql start slave sql_thread;

以上是“MySQL 5.5 级联复制配置的示例分析”这篇文章的所有内容，感谢各位的阅读！希望分享的内容对大家有帮助，更多相关知识，欢迎关注丸趣 TV 行业资讯频道！

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