四、主主（master-master）同步配置
1）172.16.71.132机器my.cnf
skip-name-resolve
server_id = 132
set-variable = key_buffer_size=512M
set-variable = table_cache=32
set-variable = sort_buffer_size=32M
set-variable = read_buffer_size=32M
set-variable = max_connections=2100
set-variable = log_slow_queries=/var/lib/mysql/log/mysql-slow.log
set-variable = log_bin=/var/lib/mysql/log/mysql-bin
set-variable = long_query_time=1
set-variable = thread_concurrency=16
set-variable = tmp_table_size=4000000000
set-variable = slave_skip_errors=all
#replicate-ignore-db=mysql
#replicate-ignore-db=test 发觉加上这个ignore选项后会导致mmm接管出现点小问题不知道为什么
log-slave-updates
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=1
进入mysql配置设置为从
mysql> change master to master_host='172.16.71.128';
mysql>change master to master_user='repl';
mysql>change master to master_password='ths';
mysql>start slave
主（master）服务器配置：
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'172.16.71.%' IDENTIFIED BY 'ths';
2）172.16.71.128机器my.cnf配置
skip-name-resolve
server_id = 1
set-variable = key_buffer_size=512M
set-variable = table_cache=32
set-variable = sort_buffer_size=32M
set-variable = read_buffer_size=32M
set-variable = max_connections=2100
set-variable = log_slow_queries=/var/lib/mysql/log/mysql-slow.log
set-variable = log_bin=/var/lib/mysql/log/mysql-bin
set-variable = long_query_time=1
set-variable = thread_concurrency=16
set-variable = tmp_table_size=4000000000
set-variable = slave_skip_errors=all
#replicate-ignore-db=mysql
#replicate-ignore-db=test
log-slave-updates
sync_binlog=1
auto_increment_increment=2
auto_increment_offset=2
进入mysql配置设置为从
mysql> change master to master_host='172.16.71.132';
mysql>change master to master_user='repl';
mysql>change master to master_password='ths';
mysql>start slave
主（master）服务器配置：
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'172.16.71.%' IDENTIFIED BY 'ths';
五、其它从(slave)服务器配置：
my.cnf配置
skip-name-resolve
server_id = 1
set-variable = key_buffer_size=512M
set-variable = table_cache=32
set-variable = sort_buffer_size=32M
set-variable = read_buffer_size=32M
set-variable = max_connections=2100
set-variable = log_slow_queries=/var/lib/mysql/log/mysql-slow.log
set-variable = log_bin=/var/lib/mysql/log/mysql-bin
set-variable = long_query_time=1
set-variable = thread_concurrency=16
set-variable = tmp_table_size=4000000000
set-variable = slave_skip_errors=all
mysql>change master to master_host='172.16.71.253';
mysql>change master to master_user='repl';
mysql>change master to master_password='ths'; mysql>change master to master_log_file=’mysql-bin.00001’;
mysql>change master to master_log_pos=128; mysql>start slave
或者在my.cnf加入
server-id=2
master-host=172.16.71.253
master-user=repl
master-password=ths
问题1：
两台机器互为对方的主，此时不能使用master的VIP作为该两机器的主，如果使用VIP作为master的话没有一台先起来作为vip机器的话些会导致monitor不能使用，日志如下：
2010/12/06 16:29:46 WARN db1 is not replicating from db2
2010/12/06 16:29:46 WARN db2 is not replicating from db1
问题2：
当/etc/mysql-mmm/mmm_mon.conf的auto_set_online 3时间设置为较长时，在瞬间关闭现有主，开启现未开启的备时，会导致monitor不能自动切换VIP导致mmm不可用，需要手工设置online状态，有时候甚至会导致monitor启动问题。为防止这情况发生可以把该时间设置短些，或者先让一其中的一台主起来后，再关闭另一台。
问题3：ERROR：Can't connect to monitor daemon
查看进程一般少了perl相关进程，莫名其妙的感觉，经多次尝试试验，一般都是在mysql那些拥有agent机器上的配置问题，还有monitor的auto_set_online时间设置
[root@localhost ~]# ps axu|grep mmm
root 3113 0.0 7.6 14000 8956 ? S 16:27 0:00 mmm_mond
root 3115 0.9 33.2 106440 38976 ? Sl 16:27 0:00 mmm_mond
root 3136 0.4 5.5 10388 6456 ? S 16:28 0:00 perl /usr/libexec/mysql-mmm/monitor/checker ping_ip
root 3140 0.4 6.5 15208 7640 ? S 16:28 0:00 perl /usr/libexec/mysql-mmm/monitor/checker mysql
root 3141 0.3 5.4 10388 6448 ? S 16:28 0:00 perl /usr/libexec/mysql-mmm/monitor/checker ping
root 3142 0.5 6.5 15208 7636 ? S 16:28 0:00 perl /usr/libexec/mysql-mmm/monitor/checker rep_backlog
root 3144 0.6 6.4 15208 7592 ? S 16:28 0:00 perl /usr/libexec/mysql-mmm/monitor/checker rep_threads
root 3148 0.0 0.5 3916 652 pts/0 R+ 16:28 0:00 grep mmm
六、其它补充资料
主从状态查看：
查看master的状态
SHOW MASTER STATUS;
Position不应为0
查看slave的状态
show slave status;
Slave_IO_Running | Slave_SQL_Running这两个字段 应为YES|YES.
show processlist;查看进程
slave start; #启动从复制
STOP SLAVE; #停止从复制
RESET MASTER; #重设master日志
RESET SLAVE;#重设slave日志
当Slave_IO_Running: 为No时，从服务器无法同步时操作下如
SLAVE STOP;#停止slave
CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=0;
#把master_log_file设置为从主show master status;得出来的日志名，POS设置为0
SLAVE START;#再次启用slave
Mysql普通主从配置（未使用mmm参考）
配置主从my.cnf文件：
skip-innodb
skip-name-resolve
server_id = 132
set-variable = key_buffer_size=512M
set-variable = table_cache=32
set-variable = sort_buffer_size=32M
set-variable = read_buffer_size=32M
set-variable = max_connections=2100
set-variable = log_slow_queries=/var/lib/mysql/log/mysql-slow.log
set-variable = log_bin=/var/lib/mysql/log/mysql-bin#从库这条语句注释掉
set-variable = long_query_time=1
set-variable = thread_concurrency=16
set-variable = tmp_table_size=4000000000
set-variable = slave_skip_errors=all
因为mysql版本不同在从服务器下开启了下面选项导致同步不能进行
replicate-ignore-db=mysql
replicate-do-db =test
http://liuyu.blog.51cto.com/183345/98867
http://mysql-mmm.org/mmm2:guide
http://wenku.baidu.com/view/947f0e160b4e767f5acfce37.html
http://blog.chinaunix.net/u3/93755/showart.php?id=2213538
本文转自 qwjhq 51CTO博客，原文链接:http://blog.51cto.com/bingdian/454147
