linux配置虚拟ip实现主备双击高可用

背景：设置了虚拟ip指向两台服务器，但是没有配置虚拟网卡，虚拟ip10.249.134.227 分别指向 10.249.134.193，10.249.134.194，

使用HaVip结合keepalived实现主备双机高可用

转自HaVip结合keepalived实现主备双机高可用 (aliyun.com)

1.执行以下命令，主从服务器分别安装keepalived。

yum install keepalived

2、分别编辑keepalived配置文件 /etc/keepalived/keepalived.conf

编辑完成了分别执行systemctl start keepalived启动keepalived

主服务器

! Configuration File for keepalived
global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}
#vrrp_script checkhaproxy
#{
#    script "/etc/keepalived/do_sth.sh"
#    interval 5
#}
vrrp_instance VI_1 {
state MASTER           #设置ECS1实例为主实例
    interface eth0          #设置网卡名，本示例配置为eth0  
    virtual_router_id 51
    nopreempt              
#    preempt_delay 10
    priority 100             #设置优先级，数字越大，优先级越高，本示例配置主用实例优先级为100
    advert_int 1        
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    unicast_src_ip 10.249.134.193   #设置ECS实例的私网IP地址，本示例配置为192.168.0.209
    unicast_peer {
        10.249.134.194           #对端ECS实例的私网IP地址，本示例配置为192.168.0.210
    }
    virtual_ipaddress {
        10.249.134.227          #设置HaVip的IP地址，本示例配置为192.168.0.88 
    }
    notify_master "/etc/keepalived/notify_action.sh MASTER"
    notify_backup "/etc/keepalived/notify_action.sh BACKUP"
    notify_fault "/etc/keepalived/notify_action.sh FAULT"
    notify_stop "/etc/keepalived/notify_action.sh STOP"
    garp_master_delay 1
    garp_master_refresh 5

        track_interface {
                eth0                #设置ECS实例网卡名，本示例配置为eth0
        }
#    track_script {
#        checkhaproxy 
#    }
}

从服务器

! Configuration File for keepalived
global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}
#vrrp_script checkhaproxy
#{
#    script "/etc/keepalived/do_sth.sh"
#    interval 5
#}
vrrp_instance VI_1 {
state BACKUP           #设置ECS2实例为备用实例
    interface eth0          #设置网卡名，本示例配置为eth0  
    virtual_router_id 51
    nopreempt              
#    preempt_delay 10
    priority 10             #设置优先级，数字越大，优先级越高，本示例配置备用实例优先级为10
    advert_int 1        
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    unicast_src_ip 10.249.134.194   #设置ECS实例的私网IP地址，本示例配置为192.168.0.210
    unicast_peer {
        10.249.134.193           #对端ECS实例的私网IP地址，本示例配置为192.168.0.209
    }
    virtual_ipaddress {
        10.249.134.227         #设置HaVip的IP地址，本示例配置为192.168.0.88 
    }
    notify_master "/etc/keepalived/notify_action.sh MASTER"
    notify_backup "/etc/keepalived/notify_action.sh BACKUP"
    notify_fault "/etc/keepalived/notify_action.sh FAULT"
    notify_stop "/etc/keepalived/notify_action.sh STOP"
    garp_master_delay 1
    garp_master_refresh 5

        track_interface {
                eth0                #设置ECS实例网卡名，本示例配置为eth0
        }
#    track_script {
#        checkhaproxy 
#    }
}

注意点：eth0为本地网卡名称，可通过ifconfig查看