简介:
Mysql 的主从同步功能,这种解决方案是企业很常见的一种。常用于备份数据库,当客户端操作主库时,主库会产生binlog日志文件,
从库通过复制主库的binlog日志文件,然后解析成相应的 SQL 语句在从库执行,实现主从一致的效果。
这种解决方案只提供了日志的同步执行功能,而从库只能提供读操作,当主服务器发生故障时,必须手动处理故障转移,一般情况下的做法是将一台从服务器改为主服务器。
Master : 192.168.1.88
Slave : 192.168.1.80
一、配置 Master
[[email protected] ~]# vim /etc/my.cnf log-bin = mysql-bin # 开启 binlog 日志记录 server-id = 1 # 设置 id 号,此 ID 号全局唯一 [[email protected] ~]# service mysqld start [[email protected] ~]# netstat -anpt | grep 3306 # 检测 Mysql 是否启动成功 [[email protected] ~]# chkconfig --add mysqld [[email protected] ~]# chkconfig --level 35 mysqld on [[email protected] ~]# iptables -I INPUT -s 192.168.1.80 -p tcp --dport 3306 -j ACCEPT [[email protected] ~]# service iptables save
二、配置 Slave
[[email protected] ~]# vim /etc/my.cnf server-id = 2 # 设置 id 号,此 ID 号全局唯一 relay-log = mysql-relay-bin # 指定 relay-log 日志文件的命名格式 replicate-wild-ignore-table = mysql.% # 过滤不需要复制的表 replicate-wild-ignore-table = test.% replicate-wild-ignore-table = information_schema.% replicate-wild-ignore-table = performance_schema.% [[email protected] ~]# service mysqld start [[email protected] ~]# chkconfig --add mysqld [[email protected] ~]# chkconfig --level 35 mysqld on [[email protected] ~]# iptables -I INPUT -s 192.168.1.88 -p tcp --dport 3306 -j ACCEPT [[email protected] ~]# service iptables save
三、小插曲
四、Master 创建复制用户并授权
[[email protected] ~]# mysql -u root -p123456 mysql> grant replication slave on *.* to ‘rep1_user‘@‘192.168.1.80‘ identified by ‘rep1_passwd‘; mysql> show master status; +------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000008 | 324 | | | +------------------+----------+--------------+------------------+ 1 row in set (0.00 sec)
五、Slave 添加 Master 信息
[[email protected] ~]# mysql -u root -p123456 mysql> change master to -> master_host=‘192.168.1.88‘, -> master_user=‘rep1_user‘, -> master_password=‘rep1_passwd‘, -> master_log_file=‘mysql-bin.000008‘, -> master_log_pos=324; mysql> start slave; mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.1.88 Master_User: rep1_user Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000008 Read_Master_Log_Pos: 324 Relay_Log_File: mysql-relay-bin.000002 Relay_Log_Pos: 267 Relay_Master_Log_File: mysql-bin.000008 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: mysql.%,test.%,information_schema.%,performance_schema.% Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 324 Relay_Log_Space: 430 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 1 Master_UUID: b5e20203-86b5-11e4-b69c-000c29d099fa Master_Info_File: /usr/local/mysql/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: 1 row in set (0.00 sec)
## 重点关注:Slave_IO_Running 跟 Slave_SQL_Running 这两个主从复制线程,正常情况下这两项都为 YES !
## 还需要关注:Slave_IO_State、Master_Host、Master_Log_File、Read_Master_Log_Pos、Relay_Log_File、Relay_Log_Pos、Relay_Master_Log_File
## Replicate_Wild_Ignore_Table 这项可以看到同步过程中过滤了哪些库(表)。
附:
三、小插曲
## 在做主从同步前,主库已经有数据时,需要做以下处理。
mysql> flush tables with read lock; # 主库锁表操作,让数据库只能读,不能写
## 保留此终端,重新打开一个 tty ,如果关闭此终端则锁表失效。
[[email protected] ~]# cd /usr/local/ [[email protected] local]# tar zcf mysql.tar.gz mysql # 备份整个数据库 [[email protected] local]# rsync -a mysql.tar.gz 192.168.1.80:/usr/local/ # 将数据传到从库 [[email protected] local]# service mysqld stop # 关闭从库的 Mysql [[email protected] local]# mv mysql old.mysql # 将原有 mysql 目录改名 [[email protected] local]# tar zxf mysql.tar.gz # 解压出主库的 mysql 目录 [[email protected] local]# service mysqld restart # 重启主库 Mysql 服务 [[email protected] local]# service mysqld start # 启动从库 Mysql 服务
时间: 2024-10-10 17:41:49