yum install -y wget make gcc openssl-devel popt-devel

wget https://www.keepalived.org/software/keepalived-2.0.18.tar.gz

tar zxvf keepalived-2.0.18

cd keepalived-2.0.18

 ./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 /keepalived-2.0.18/keepalived/etc/init.d/keepalived  /etc/init.d

mkdir -p /etc/keepalived/

cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

chmod +x /etc/init.d/keepalived

vi /etc/keepalived/keepalived.conf

global_defs {

    router_id LVS_DEVEL

}

vrrp_script chk_haproxy {

    script "/etc/keepalived/chk.sh"                      //检查haproxy的脚本

    interval 2                                           //每两秒检查一次

}

vrrp_instance VI_1 {

    state MASTER                                        //定义为MASTER节点

    nopreempt                                           //开启不抢占

    interface eth0

    virtual_router_id 51

    priority 100                                        //开启了不抢占，所以此处优先级必须高于另一台

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass abcd

    }

    virtual_ipaddress {

        172.17.0.21                                 //配置VIP  当前DOCKER IP：172.17.0.20

    }
    track_script {
        chk_haproxy                                    //调用检查脚本
    }

    notify_backup "/etc/init.d/haproxy restart"    //KA 启动Haproxy

    notify_fault "/etc/init.d/haproxy stop"

}

5.chk.sh文件：

vi /etc/keepalived/chk.sh

#!/bin/bash
#
if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then
       /etc/init.d/keepalived stop
fi

chmod +x /etc/keepalived/chk.sh

service keepalived start

参考：https://www.cnblogs.com/tae44/p/4717334.html  https://www.cnblogs.com/kgdxpr/p/3325788.html