标签：mysql双主互备
MySQL双主互备即两台MySQL服务器同时是主服务器，而同时又是对方的从服务器，这样可以分担主服务器的一部分写请求，因为如果是单主模型的话数据写入只能写入在一台MySQL服务器，而双主模型则可同时写在两台服务器上，有效加快了写入的速度，而且还能提供数据的备份功能。
环境如下：
server1：CentOS 6.5 x86_64 mariadb 10.0.10 IP:192.168.10.204
server2：CentOS 6.5 x86_64 mariadb 10.0.10 IP:192.168.10.205
一：服务器的my.cnf配置：
Server1:my.cnf全部配置如下：
[root@node4 ~]# grep -v "#" /etc/mysql/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 256M
max_allowed_packet = 1M
table_open_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 16M
thread_concurrency = 4
datadir = /data/mydata
innodb_file_per_table = ON #每一条事物完成后就写入二进制
log-bin=/data/binlogs/master-bin #二进制日志目录
binlog_format=mixed
server-id = 100 #两台服务器的server-id绝不可以相同
auto_increment_increment=2 # 定义每次增长间隔为2即步长，起始值为1步长为2表示每次增长就加2,1、3、5、7、9，用于和从服务器区分值
auto_increment_offset=1 # 定义主键自动增长起始值
skip_slave_start #跳过slave备份线程，即服务启东时候不自动打开
relay_log = /data/relaylogs/relay-bin #中继日志路径
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeou
server2 my.cnf全部配置：
[root@node5 ~]# grep -v "#" /etc/mysql/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
[mysqld]
port = 3306
socket = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 256M
max_allowed_packet = 1M
table_open_cache = 256
sort_buffer_size = 1M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 16M
thread_concurrency = 4
innodb_file_per_table = ON
datadir = /data/mydata
log-bin=/data/binlogs/master-bin
binlog_format=mixed
server-id = 4
auto_increment_increment=2
auto_increment_offset=2
skip_slave_start
relay_log = /data/relaylogs/relay-bin
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[myisamchk]
key_buffer_size = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
然后启动mysqld服务
二：授权复制并启动复制：
1、server1：
mysql> grant replication slave,file on *.* to ‘tom‘@‘192.168.%.%‘ identified by ‘123456‘;
mysql> flush privileges;
2、server2：
mysql> grant replication slave,file on *.* to ‘tom‘@‘192.168.%.%‘ identified by ‘123456‘;
mysql> flush privileges;
3、在各个server指向对方当主服务器：
server1：
mysql> CHANGE MASTER TO MASTER_HOST=‘192.168.10.205‘,MASTER_USER=‘tom‘,MASTER_PASSWORD=‘123456‘,MASTER_LOG_FILE=‘master-bin.000004‘,MASTER_LOG_POS=1160;
注：MASTER_LOG_FILE=‘master-bin.000004‘,MASTER_LOG_POS=1160; 是对方主服务器192.168.10.205查看show master status得知
server2：
mysql> CHANGE MASTER TO MASTER_HOST=‘192.168.10.204‘,MASTER_USER=‘tom‘,MASTER_PASSWORD=‘123456‘,MASTER_LOG_FILE=‘master-bin.000003‘,MASTER_LOG_POS=526;
注：MASTER_LOG_FILE=‘master-bin.000004‘,MASTER_LOG_POS=1160; 是对方主服务器192.168.10.204查看show master status得知
4、启动slave线程：
server1：
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
server2：
mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
5、查看状态：
serever1：
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.10.205
Master_User: tom
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000004
Read_Master_Log_Pos: 1160
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 536
Relay_Master_Log_File: master-bin.000004
Slave_IO_Running: Yes #
Slave_SQL_Running: Yes #此两个线程一定要启动
server2：
mysql>show slave status\G
***************************1. row ***************************
Slave_IO_State:Waiting for master to send event
Master_Host:192.168.10.204
Master_User:tom
Master_Port:3306
Connect_Retry:60
Master_Log_File:master-bin.000003
Read_Master_Log_Pos:843
Relay_Log_File:relay-bin.000002
Relay_Log_Pos:853
Relay_Master_Log_File:master-bin.000003
Slave_IO_Running:Yes
Slave_SQL_Running:Yes
6、在任意一个server创建库和表并插入内容差可能能否同步：
server1：
mysql> create database linux;
Query OK, 1 row affected (0.00 sec)
server2：
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| linux |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.04 sec)
mysql> use linux;
Database changed
mysql> create table t1 (id int);
Query OK, 0 rows affected (0.16 sec)
mysql> insert into t1 values (1),(2),(3);
Query OK, 3 rows affected (0.08 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from t1;
+------+
| id |
+------+
| 1 |
| 2 |
| 3 |
+------+
3 rows in set (0.00 sec)
server1：
mysql> insert into t1 values (4),(5),(6);
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from t1;
+------+
| id |
+------+
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 6 |
+------+
6 rows in set (0.00 sec)
本文出自 “Linux” 博客，请务必保留此出处http://zhangshijie.blog.51cto.com/806066/1606725
标签：mysql双主互备
原文地址：http://zhangshijie.blog.51cto.com/806066/1606725
