#下载keepalived
./configure --prefix=/usr/local
Make && make install

Atlas主安装keepalived

Atlas备安装keepalived

Atlas1  Keepalived.conf文件如下:

! Configuration File for keepalived

global_defs {

}

#自定义vrrp脚本
vrrp_script chk_port {
script /etc/keepalived/atlas.sh
#60秒检查一次
    interval 60
}

vrrp_instance VI_1 {
    #指定节点状态
    state BACKUP
    #制定绑定的网卡
    interface eth0
    #vrrp 组ID,同一组内必须相同
    virtual_router_id 51
    #优先权,值大优先级大
    priority 100
    #组播信息发送间隔
    advert_int 1
    #禁止抢占
    nopreempt
    #验证信息，两节点设置相同
    authentication {
        auth_type PASS
        auth_pass 99989
    }
    track_script {
        chk_port
    }
    #虚拟IP，两节点设置相同
virtual_ipaddress {
#虚拟IP 申请
        192.168.0.221/24 dev eth0
    }
    ##扩展
    #notify_master /etc/keepalived/m.sh
    #notify_backup /etc/keepalived/b.sh
}

10秒检查一次，如果3次Atlas都是关闭,停止keepalived服务,vip切换
#!/bin/bash
v_port=3100
v_j=0
for ((i=0; i<3; i++)); do
        #检测端口是否存在,用端口 或者 用进程
        v_num=`netstat -npl | grep $v_port | grep mysql-proxy | wc -l`
        v_mysql_proxy_num=`ps -C mysql-proxy --no-header |wc -l`
        #端口不在，进程不在，关闭keepalived,切换VIP
        if [ "$v_num" == "0" -a "$v_mysql_proxy_num" == "0" ]
        then
                v_j=`expr $v_j + 1`
        fi
        sleep 10
done

if [ "$v_j" == "3" ]
then 
        killall keepalived
fi

! Configuration File for keepalived

global_defs {

}

#自定义vrrp脚本
vrrp_script chk_port {
    script /etc/keepalived/atlas.sh
    interval 60
}

vrrp_instance VI_1 {
    #指定节点状态
    state BACKUP
    #制定绑定的网卡
    interface eth0
    #vrrp 组ID,同一组内必须相同
    virtual_router_id 51
    #优先权,值大优先级大
    priority 100
    #组播信息发送间隔
    advert_int 1
    #禁止抢占
    nopreempt
    #验证信息，两节点设置相同
    authentication {
        auth_type PASS
        auth_pass 99989
    }
    track_script {
        chk_port
    }
    #虚拟IP，两节点设置相同
    virtual_ipaddress {
        192.168.0.221/24 dev eth0
    }
    ##扩展
    #notify_master /etc/keepalived/m.sh
    #notify_backup /etc/keepalived/b.sh
}

10秒检查一次，如果3次Atlas都是关闭,停止keepalived服务,vip切换
#!/bin/bash
v_port=3100
v_j=0
for ((i=0; i<3; i++)); do
        #检测端口是否存在,用端口 或者 用进程
        v_num=`netstat -npl | grep $v_port | grep mysql-proxy | wc -l`
        v_mysql_proxy_num=`ps -C mysql-proxy --no-header |wc -l`
        #端口不在，进程不在，关闭keepalived,切换VIP
        if [ "$v_num" == "0" -a "$v_mysql_proxy_num" == "0" ]
        then
                v_j=`expr $v_j + 1`
        fi
        sleep 10
done

if [ "$v_j" == "3" ]
then 
        killall keepalived
fi

Atlas1,Atlas2 keepalived配置相同,BACKUP-BACKUP
三次扫描3100端口,如果不存在,关闭keepalived。VIP切换,注意目前Atlas主，从之间端口不一致。
主从端口最好一致，端口不一致,jdbc failover控制，不知道会不会出问题.

发生vip切换，需要查找原因，keepalived关闭后，需要手动启动,启动后不会占vip。

连接池暂不考虑haproxy,如果性能出问题，最先在数据库，而不是中间件