Home  >  Article  >  Database  >  MySQL互为主从双配置_MySQL

MySQL互为主从双配置_MySQL

WBOY
WBOYOriginal
2016-06-01 13:44:54920browse

bitsCN.com

1)        A , B 两台 mysql 服务器
一、服务器参数,编辑 /etc/my.cnf

[A 服务器 ]
server-id = 1
binlog-do-db = test
binlog-ignore-db = mysql
replicate-do-db = test
replicate-ignore-db = mysql
master-host     =   192.168.255.195
master-user     =   repl
master-password =   repl
master-port     =  3306
master-connect-retry = 10
sync-binlog = 1
log-bin=mysql-bin

[B 服务器 ]
server-id = 2
binlog-do-db = test
binlog-ignore-db = mysql
replicate-do-db = test
replicate-ignore-db = mysql
master-host     =   192.168.255.194
master-user     =   repl
master-password =   repl
master-port     =  3306
master-connect-retry = 10
sync-binlog = 1
log-bin=mysql-bin
 
2)        在 A 和 B 上进行数据库操作
A/B: Slave stop;
A/B: Reset master;
A: grant replication slave on *.* to repl@192.168.255.194 identified by 'repl';
B: grant replication slave on *.* to repl@192.168.255.195 identified by 'repl';
A/B: show master status;
A: change master to master_host='192.168.255.194',master_user='repl',master_password='repl',master_port=3306,master_log_file='mysql-bin.000001',master_log_pos=98;(log 根据 master status)
B:
change master to master_host='192.168.255.195',master_user='repl',master_password='repl',master_port=3306,master_log_file='mysql-bin.000006',master_log_pos=98; (log 根据 master status)
A/B: slave start;
A/B: show slave status/G;( 查看同步状态 )
看到如下状态就表示同步成功
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Seconds_Behind_Master: 0
 
3)        测试数据库同步,在 A 的 test 库里增加表,在 B 的 test 库里删除表
Use test ;
A:Create table username (id int(15));
查看 B 中是否有 username 这个表
B: drop table username
查看 A 中是否已经删除 usernam 这个表
A/B : show slave status/G;( 再次查看同步状态,如果没问题就表示成功 )
 
4)        互为同步配置实例
1. A B 互为主从同步 test, 不同步 mysql :
两个数据库配置中均设置: binlog-do-db=test, binlog-ignore-db=mysql , replicate-do-db=test , replicate-ignore-db=mysql
2. A B 互为主从只同步 test ,不同步其他数据库,新创建的也不会同步
两个数据库配置中均设置: binlog-do-db=test , replicate-do-db=test
3. A B 互为主从不同步 mysql, 同步其他数据库,譬如创建的新数据库也会同步
两个数据库配置中均设置: binlog-ignore-db=mysql , replicate-ignore-db=mysql
4. A B 互为主从同步所有数据库,包括新建的数据库
两个数据库配置中均不设置上述四项
 
5) 实现自动同步的 shell 脚本
1.        增加 super 和 replication client on 权限
grant super  on *.* to repl@192.168.255.194 identified by 'repl';
grant replication client on *.* to repl@192.168.255.194 identified by 'repl';
 
2.       自动同步脚本 autosync.sh
#!/bin/bash
while true
do
status=`/usr/bin/mysql -uroot -e "show slave status/G;"|grep Slave_SQL_Running|cut -f2 -d":"|sed 's/ //'`
if [ $status != "Yes" ]
then
A=`/usr/bin/mysql -urepl -prepl -h192.168.255.194 -e "show master status"|grep mysql-bin|awk '{print $2}'`
/usr/bin/mysql -uroot -e "slave stop"
/usr/bin/mysql -uroot -e "change master to master_host='192.168.255.194',master_user='repl',master_password='repl',master_port=3306,
master_log_file='mysql-bin.000001',master_log_pos=$A"
/usr/bin/mysql -uroot -e "slave start"
fi
sleep 10
done
 
3.       后台执行
nohup ./autosync.sh >/dev/null 2>&1 &

作者“duanjiangong”
 

bitsCN.com
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn