MySQL的MMM高可用架构测试(2)

ip 127.0.0.1
pid_path /var/run/mmm_mond.pid
bin_path /usr/lib/mysql-mmm/
status_path /var/lib/misc/mmm_mond.status
ping_ips 192.168.9.157, 192.168.9.158,192.168.9.254
</monitor>
<host default>
monitor_user mmm_monitor
monitor_password RepMonitor
</host>
debug 0
 
------------------------[4] mmm_agent.conf  ——————–
include mmm_common.conf
this db1 #在DB1上就写成这样，DB2上就写成this db2，写错了，将有一台DB的mysql-mmm-agent开不起来！切记！
 
查看状态：
[root@Proxy ~]# mmm_control show
db1(192.168.9.157) master/ONLINE. Roles: reader(192.168.9.156), writer(192.168.9.154)
db2(192.168.9.158) master/ONLINE. Roles: reader(192.168.9.155)
[root@Proxy ~]# mmm_control checks
db2 ping [last change: 2012/02/03 14:04:41] OK
db2 mysql [last change: 2012/02/03 14:04:41] OK
db2 rep_threads [last change: 2012/02/03 14:04:41] OK
db2 rep_backlog [last change: 2012/02/03 14:04:41] OK: Backlog is null
db1 ping [last change: 2012/02/03 14:04:41] OK
db1 mysql [last change: 2012/02/03 14:04:41] OK
db1 rep_threads [last change: 2012/02/03 14:04:41] OK
db1 rep_backlog [last change: 2012/02/03 14:04:41] OK: Backlog is null
[root@Proxy ~]# mmm_control mode
ACTIVE
 
模拟宕机切换：
随便找一个客户端，执行写操作:
@client[root@mysql-1 ~]# vi /usr/local/mysql/binlog/inserting-into-db.sh
#!/bin/bash
while true;
do
mysql -ufbdb_user -pJc7ech-fB-me -h192.168.9.154 --database= fbdb -e "insert into test values(null);"
sleep 1 ;
done;
[root@mysql-1 ~]# ./inserting-into-db.sh &
 
可以看到两个db中的binlog显示的server id都是1，也就是说当前情况下db1是作为写库。
停止db1
[root@fbfldb01 ~]# /etc/init.d/mysqld stop
Shutting down MySQL.. SUCCESS!
立即恢复DB1后proxy上查看mmm集群状态
 
检查mmmDB1的日志：
[root@fbfldb01 binlog]# tail -f /var/log/mysql-mmm/mmm_agentd.log
2012/02/03 17:46:10 FATAL Couldn't allow writes: ERROR: Can't connect to MySQL (host = 192.168.9.157:3306, user = mmm_agent)! Lost connection to MySQL server at 'reading initial communication packet', system error: 111
2012/02/03 17:46:13 INFO We have some new roles added or old rules deleted!
2012/02/03 17:46:13 INFO Deleted: reader(192.168.9.156), writer(192.168.9.154)
2012/02/03 17:46:13 FATAL Couldn't deny writes: ERROR: Can't connect to MySQL (host = 192.168.9.157:3306, user = mmm_agent)! Lost connection to MySQL server at 'reading initial communication packet', system error: 111
2012/02/03 17:59:48 INFO We have some new roles added or old rules deleted!
2012/02/03 17:59:48 INFO Added: reader(192.168.9.155)
2012/02/03 18:01:12 INFO We have some new roles added or old rules deleted!
 
从日志可以看出，db1停止之后，mmm提示connect error，由于当前的写库是db1，于是mmm认为db2上的数据已经不能和db1保持一致了，故把db2的读角色(reader)迁移到db1上。 变成了：