keepalived 非抢占模式

淩亂°似流年 2022-01-11 09:25 257阅读 0赞

# keepalived 非抢占模式 #

抢占模式为当keepalived的某台机器挂了之后VIP漂移到了备节点，当主节点恢复后主动将VIP再次抢回，keepalived默认工作在抢占模式下，而非抢占模式则是当主节挂了再次起来后不再抢回VIP。此处需要注意非抢占模式的keepalived其工作机制必须都为BACKUP，并且开启nopreempt选项.

## 实现keepalived 非抢占模式 ##

准备主机2台

<table> 
 <thead> 
  <tr> 
   <th style="text-align:left;">server</th> 
   <th style="text-align:left;">host</th> 
   <th style="text-align:left;">ip</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td style="text-align:left;">keepalived</td> 
   <td style="text-align:left;">s1</td> 
   <td style="text-align:left;">172.20.27.10</td> 
  </tr> 
  <tr> 
   <td style="text-align:left;">keepalived</td> 
   <td style="text-align:left;">s2</td> 
   <td style="text-align:left;">172.20.27.11</td> 
  </tr> 
 </tbody> 
</table>

--------------------

### s1节点配置 ###

修改配置文件

[root@s1 ~]# vim /etc/keepalived/keepalived.conf 
    global_defs {
       notification_email {
            root@mylinuxops.com
       }
       notification_email_from root@mylinuxops.com
       smtp_server 127.0.0.1
       smtp_connect_timeout 30
       router_id s1.mylinuxops.com
       vrrp_skip_check_adv_addr
       vrrp_strict
       vrrp_iptables
       vrrp_garp_interval 0
       vrrp_gna_interval 0
    }
    
    vrrp_instance VI_1 {
        state BACKUP
        interface ens33
        virtual_router_id 27
        priority 100
        advert_int 2
        nopreempt
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
            172.20.27.100 dev ens33 label ens33:0
        }
    }

重启服务

[root@s1 ~]# systemctl restart keepalived

## s2 节点操作 ##

修改配置文件

[root@s2 ~]# vim /etc/keepalived/keepalived.conf 
    global_defs {
       notification_email {
            root@mylinuxops.com
       }
       notification_email_from root@mylinuxops.com
       smtp_server 127.0.0.1
       smtp_connect_timeout 30
       router_id s2.mylinuxops.com
       vrrp_skip_check_adv_addr
       vrrp_strict
       vrrp_iptables
       vrrp_garp_interval 0
       vrrp_gna_interval 0
    }
    
    vrrp_instance VI_1 {
        state BACKUP
        interface ens33
        virtual_router_id 27
        priority 80
        advert_int 2
        nopreempt
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
            172.20.27.100 dev ens33 label ens33:0
        }

重启服务

[root@s2 ~]# systemctl restart keepalived

## 测试 ##

查看当前vip所在位置

[root@s1 ~]# ifconfig
    ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.20.27.10  netmask 255.255.0.0  broadcast 172.20.255.255
            inet6 fe80::20c:29ff:fec5:123c  prefixlen 64  scopeid 0x20<link>
            ether 00:0c:29:c5:12:3c  txqueuelen 1000  (Ethernet)
            RX packets 71851  bytes 5769380 (5.5 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 30175  bytes 7417306 (7.0 MiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.20.27.100  netmask 255.255.255.255  broadcast 0.0.0.0
            ether 00:0c:29:c5:12:3c  txqueuelen 1000  (Ethernet)
    
    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
            inet 127.0.0.1  netmask 255.0.0.0
            inet6 ::1  prefixlen 128  scopeid 0x10<host>
            loop  txqueuelen 1000  (Local Loopback)
            RX packets 2  bytes 140 (140.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 2  bytes 140 (140.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

当前VIP在s1节点上，当s1节点挂了之后再次查看

[root@s1 ~]# systemctl stop keepalived

VIP已经迁移至s2节点

[root@s2 ~]# ifconfig
    ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.20.27.11  netmask 255.255.0.0  broadcast 172.20.255.255
            inet6 fe80::20c:29ff:fe4d:1ce3  prefixlen 64  scopeid 0x20<link>
            ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)
            RX packets 61298  bytes 5145141 (4.9 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 793  bytes 69325 (67.7 KiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.20.27.100  netmask 255.255.255.255  broadcast 0.0.0.0
            ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)
    
    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
            inet 127.0.0.1  netmask 255.0.0.0
            inet6 ::1  prefixlen 128  scopeid 0x10<host>
            loop  txqueuelen 1000  (Local Loopback)
            RX packets 6  bytes 482 (482.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 6  bytes 482 (482.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

此时再次启动s1节点查看vip是否抢回

[root@s1 ~]# systemctl start keepalived
    [root@s1 ~]# ifconfig
    ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.20.27.10  netmask 255.255.0.0  broadcast 172.20.255.255
            inet6 fe80::20c:29ff:fec5:123c  prefixlen 64  scopeid 0x20<link>
            ether 00:0c:29:c5:12:3c  txqueuelen 1000  (Ethernet)
            RX packets 76211  bytes 6139923 (5.8 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 30392  bytes 7436214 (7.0 MiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
            inet 127.0.0.1  netmask 255.0.0.0
            inet6 ::1  prefixlen 128  scopeid 0x10<host>
            loop  txqueuelen 1000  (Local Loopback)
            RX packets 2  bytes 140 (140.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 2  bytes 140 (140.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    #没有VIP

查看s2节点

[root@s2 ~]# ifconfig
    ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.20.27.11  netmask 255.255.0.0  broadcast 172.20.255.255
            inet6 fe80::20c:29ff:fe4d:1ce3  prefixlen 64  scopeid 0x20<link>
            ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)
            RX packets 63311  bytes 5316040 (5.0 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 877  bytes 75815 (74.0 KiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    ens33:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.20.27.100  netmask 255.255.255.255  broadcast 0.0.0.0
            ether 00:0c:29:4d:1c:e3  txqueuelen 1000  (Ethernet)
    
    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
            inet 127.0.0.1  netmask 255.0.0.0
            inet6 ::1  prefixlen 128  scopeid 0x10<host>
            loop  txqueuelen 1000  (Local Loopback)
            RX packets 6  bytes 482 (482.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 6  bytes 482 (482.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

vip依旧在s2节点上。

转载于:https://blog.51cto.com/11886307/2406620