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HomeDatabaseMysql TutorialMySQL互为主从双配置_MySQL

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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”
 

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