配置keepalived实现haproxy高可用

架构

192.168.153.18  |  haproxy01,keepalived主
192.168.153.18  |  haproxy02,keepalived备

安装haproxy

两台机器都需要安装

yum install -y haproxy
haproxy -v

启动：

systemctl start haproxy
systemctl enable  haproxy
systemctl status   haproxy

安装keepalived

两台机器都需要安装

yum install keepalived -y

配置keepalived实现高可用

1. 主配置文件：

cat /etc/keepalived/keepalived.conf
global_defs {
   router_id  haproxy01
}
vrrp_script chk_haproxy_proxy {
    script "/etc/keepalived/check_haproxy.sh"
    interval 2
    weight 2
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.153.254
    }
    track_script {
        chk_haproxy_proxy
    }
}

2. 备配置文件：

cat /etc/keepalived/keepalived.conf
global_defs {
   router_id haproxy02
}
vrrp_script chk_haproxy_proxy {
    script "/etc/keepalived/check_haproxy.sh"
    interval 2
    weight 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.153.254
    }
    track_script {
        chk_haproxy_proxy
    }
}

3. 检察haproxy存活的脚本如下：

cat /etc/keepalived/check_haproxy.sh
#!/bin/bash

a=$(systemctl is-active haproxy)
if [  $a  != active ]
then
  systemctl stop keepalived
fi

chmod 755 /etc/keepalived/check_haproxy.sh

4. 启动keepalived

systemctl start keepalived
systemctl enable  keepalived
systemctl status  keepalived

测试

正常情况下两台机器的haproxy与keepalived都正常启动，且vip在haproxy01上：


之后我们关闭haproxy01的haproxy服务

systemctl stop haproxy

观察到vip已经漂移到了haproxy02上：

此时故障转移测试成功。