安装 Keepalived

安装环境

[root@node1 ~]# cat /etc/redhat-release
CentOS Linux release 7.1.1503 (Core) 

[root@node1 ~]# cat /proc/version 
Linux version 3.10.0-229.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.2 20140120 (Red Hat 4.8.2-16) (GCC) ) #1 SMP Fri Mar 6 11:36:42 UTC 2015

主机IP

10.0.0.20  MASTER
10.0.0.21  BACKUP

安装

[root@node1 ~]# yum -y install keepalived

查看版本

[root@node1 ~]# keepalived -v

配置 10.0.0.20 

[root@node1 ~]# vim /etc/keepalived/keepalived.conf 

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id WEB  #集群名称，相同集群名称必须相同
}

vrrp_instance VI_1 {
    state MASTER  #主从设置，这里设置为主
    interface eth0
    virtual_router_id 51
    priority 150  #定义访问优先级，数值越大优先级越高
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.0.0.30   #置虚拟IP，需在相同网段
    }
}

 配置 10.0.0.21

[root@node4 ~]# vim /etc/keepalived/keepalived.conf 

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id WEB   #集群名称，必须和web01设置相同
}

vrrp_instance VI_1 {
    state BACKUP   #主从设置，这里设置为从
    interface eth0
    virtual_router_id 51
    priority 100   #定义访问优先级，从要比主的数值小
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.0.0.30  #设置虚拟IP，必须相同
    }
}

重启服务查看10.0.0.20网卡上是否有 10.0.0.30 IP

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:e6:36:7b brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.22/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 10.0.0.30/32 scope global eth0

而此是10.0.0.21的网卡上是没有10.0.0.30 IP

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:15:ba:84 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.23/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever

可以关闭10.0.0.20 的keepalived 服务，查看IP是否转移到了10.0.0.21上

10.0.0.20 上已经没有了10.0.0.30

[root@node1 ~]# systemctl stop  keepalived

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:e6:36:7b brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.22/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever

查看10.0.0.21

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:15:ba:84 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.23/24 brd 10.0.0.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet 10.0.0.30/32 scope global eth0
       valid_lft forever preferred_lft forever

此时10.0.0.30 已经转移到了 10.0.0.21上