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（amoeba、amoeba2上都要安装）：
yum -y install kernel-devel openssl-devel popt-devel gcc
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amoeba的keepalived配置文件/etc/keepalived/keepalived.conf，内容如下： bal_defs {
notification_email {
test@test.com.cn
}
notification_email_from test@test.com.cn
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 {
192.168.121.170
}
}
配置amoeba的keepalived配置文件/etc/keepalived/keepalived.conf，内容如下： bal_defs {
notification_email {
test@test.com.cn
}
notification_email_from test@test.com.cn
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 {
192.168.121.170
}
}
3、keepalived的启动: 在amoeba、amoeba2上执行如下命令启动： /etc/rc.d/init.d/keepalived start 看看amoeba上是否绑定了虚拟IP192.168.121.170 # ip add | grep 192.168.121.170
inet 192.168.1.170/32 scope global eth0
可以看到已经成功绑定了192.168.121.170。
4、测试 停掉amoeba2，看看虚拟IP192.168.121.170会不会自动切换到amoeba2上。以及测试mysql -uroot -ppassword -h192.168.121.170登录，看看能否实现读写操作是否正常等等！
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