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！

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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

--查看参数是否生效
mysql> show variables like 'log_slave_updates';
+-------------------+-------+
| Variable_name     | Value |
+-------------------+-------+
| log_slave_updates | ON    |
+-------------------+-------+
1 row in set (0.00 sec)

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

--节点B，记录下二进制日志的文件和位置
mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 |      107 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 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;

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