Keepalived实现双机热备

Posted 2020-09-13 静小妞

一、主机从机都安装keepalived

1.安装

yum install -y keepalived

2.备份

cd /etc/keepalived
cp keepalived.conf keepalived.conf.back

二、主机配置并启动

1.创建配置文件

echo "! Configuration File for keepalived
#主机配置
global_defs {
#id,主从不同
   router_id LVS_DEVEL
}
 
vrrp_instance VI_1 {
#主机设置为MASTER 
    state MASTER
#网卡1
    interface eth0
#主从id要一样
    virtual_router_id 51
#主机权重高于从机
    priority 80
#广播时间,1秒
    advert_int 1
#配置主从要一样
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
#虚拟的ip,多个ip换行写即可
        192.168.1.237
    }
}
">./keepalived.conf

2.启动

keepalived -d -f /etc/keepalived/keepalived.conf

二、从机配置

1.创建配置文件

echo "! Configuration File for keepalived
#主机配置
global_defs {
#id,主从不同
   router_id LVS_DEVEL2
}
 
vrrp_instance VI_1 {
#从机设置为BACKUP 
    state BACKUP
#网卡1
    interface eth0
#主从id要一样
    virtual_router_id 51
#主机权重高于从机
    priority 20
#广播时间,1秒
    advert_int 1
#配置主从要一样
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
#虚拟的ip,多个ip换行写即可 主从一致
        192.168.1.237
    }
}
">./keepalived.conf

2.启动从机

keepalived -d -f /etc/keepalived/keepalived.conf

完成，访问192.168.1.237，其中一台机器断开在访问依然不会崩掉！注意2台机器的防火墙要关掉！