mysql-mmm+amoeba+keepalived实现mysql高可用和读写分离（二）
?三、利用amoeba实现高可用下的读写分离1、关于amoeba的介绍和安装我这里不做介绍了，有什么问题我们再一起讨论。
2、Amoeba在mysql-mmm架构下的配置
配置的除了amoeba的监听IP外其他的均采用上面mmm分配的浮动IP，因为当出现故障后，浮动IP会自动分配到正常的server上。amoeba.xml的配置如下：
配置文件：
3、 启动amoeba
/usr/local/amoeba/bin/amoeba &
检验启动是否成功（使用的是默认的8066端口）：
# ps aux | grep amoeba
root 15390 0.2 21.7 411800 55684 pts/0 Sl Nov09 0:13 /usr/java/jdk1.6/bin/java -server -Xms256m -Xmx256m -Xss128k -Damoeba.home=/usr/local/amoeba -Dclassworlds.conf=/usr/local/amoeba/bin/amoeba.classworlds -classpath /usr/local/amoeba/lib/classworlds-1.0.jar org.codehaus.classworlds.Launcher
4、 测试
为了有权限，请在所有mysql-server上添加上面配置的用户名和密码，比如：
grant all on test.* to zhang@'192.168.1.%' identified by 'zhang123';
flush privileges;
测试的时候比较麻烦，因为如果把主从停掉来看效果的话，mmm会将该同步状态有问题的服务器设置成REPLICATION_FAIL并将该主机上的浮动IP移动到正常服务器，比如：我将server4停掉后，就出出现如下现象：
# mmm_control show
db1(192.168.1.161) master/ONLINE. Roles: reader(192.168.1.114), reader(192.168.1.115)
db2(192.168.1.162) master/ONLINE. Roles: reader(192.168.1.112), writer(192.168.1.113)
db3(192.168.1.164) slave/REPLICATION_FAIL. Roles:
db4(192.168.1.165) slave/ONLINE. Roles: reader(192.168.1.111)
暂时没想到很好的测试办法。读写分离测试没有问题。
最近手头没有空闲的机器来做压力测试。等有了机器了再对这个架构做下压力测试！
四、利用keepalived实现amoeba高可用
Keepalived简介：Keepalived是Linux下面实现VRRP 备份路由的高可靠性运行件。基于Keepalived设计的服务模式能够真正做到主服务器和备份服务器故障时IP瞬间无缝交接。从而提高系统的可用性
1、keepalived的安装（server6、server7上都要安装）：
wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz
tar zxvf keepalived-1.1.19.tar.gz
cd keepalived-1.1.19
./configure --prefix=/usr/local/keepalived
make
make install
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
mkdir /etc/keepalived
cd /etc/keepalived/
2、 keepalived的配置
配置server6的keepalived配置文件/etc/keepalived/keepalived.conf，内容如下：
bal_defs {
notification_email {
jimo291@gmail.com
}
notification_email_from jimo291@gmail.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id test1
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
smtp_alert
authentication {
auth_type PASS
auth_pass 123
}
virtual_ipaddress {
192.168.1.170
}
}
配置server6的keepalived配置文件/etc/keepalived/keepalived.conf，内容如下：
bal_defs {
notification_email {
jimo291@gmail.com
}
notification_email_from jimo291@gmail.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id test2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 80
advert_int 1
smtp_alert
authentication {
auth_type PASS
auth_pass 123
}
virtual_ipaddress {
192.168.1.170
}
}
3、keepalived的启动:
在server6、server7上执行如下命令启动：
/etc/rc.d/init.d/keepalived start
看看server6上是否绑定了虚拟IP192.168.1.170
# ip add | grep 192.168.1.170
inet 192.168.1.170/32 scope global eth0
可以看到已经成功绑定了192.168.1.170。
4、测试
停掉server6，看看虚拟IP192.168.1.170会不会自动切换到server7上。以及测试mysql -uroot -ppassword -h192.168.1.170登录，看看能否实现读写操作是否正常等等！
备注：最后记得将所有的启动命令都写到/etc/rc.local文件中去，实现开机启动！
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