高可用keepalived的抢占式与非抢占式

1.两个节点都启动

#由于节点1的优先级高于节点2，所以VIP在节点1上面
[root@lb01 ~]# ip addr | grep 10.0.0.3
    inet 10.0.0.3/32 scope global eth0

[root@lb02 ~]# ip addr | grep 10.0.0.3

2.停止主节点

[root@lb01 ~]# systemctl stop keepalived

#节点2联系不上节点1，主动接管VIP
[root@lb02 ~]# ip addr | grep 10.0.0.3
    inet 10.0.0.3/32 scope global eth0

3.重新启动主节点

[root@lb01 ~]# systemctl start keepalived

#由于节点1的优先级高于节点2，所以恢复节点1之后，vip又漂回节点1
[root@lb01 ~]# ip addr | grep 10.0.0.3
    inet 10.0.0.3/32 scope global eth0

4.配置非抢占式

1）节点一修改

[root@lb01 ~]# vim /etc/keepalived/keepalived.conf 
... ...
vrrp_instance VI_1 {
    state BACKUP
    nopreempt
    ......
}

[root@lb01 ~]# systemctl restart keepalived

2）节点2修改

[root@lb02 ~]# vim /etc/keepalived/keepalived.conf 
... ...
vrrp_instance VI_1 {
    state BACKUP
    nopreempt
    ......
}

[root@lb02 ~]# systemctl restart keepalived

3）配置注意事项

1.两台机器节点状态都要改成 BACKUP
2.两个节点都要加上 nopreempt
3.优先级不需要改变

5.访问页面测试

#配置hosts
10.0.0.3 linux.blog.com

#访问页面
http://linux.blog.com/

#节点测试
[root@lb01 ~]# ip addr | grep 10.0.0.3
    inet 10.0.0.3/32 scope global eth0
#访问网站，并且windows查看mac地址测试
C:Users11764>arp -a
    VIP                        VMAC
  10.0.0.3              00-0c-29-d7-bc-2c     动态
  10.0.0.4              00-0c-29-d7-bc-2c     动态
  10.0.0.5              00-0c-29-89-2f-10     动态
  
#关闭节点1keepalived
[root@lb01 ~]# systemctl stop keepalived.service
[root@lb02 ~]# ip addr | grep 10.0.0.3
    inet 10.0.0.3/32 scope global eth0
#访问网站，并且windows查看mac地址测试
C:Users11764>arp -a
    VIP                        VMAC
  10.0.0.3              00-0c-29-89-2f-10     动态
  10.0.0.4              00-0c-29-d7-bc-2c     动态
  10.0.0.5              00-0c-29-89-2f-10     动态