keepalived 多节点配置方法

ゝ一世哀愁。 2024-03-27 10:13 28阅读 0赞

## keepalived 多节点配置方法 ##

> 准备3台主机

<table> 
 <thead> 
  <tr> 
   <th align="left">server</th> 
   <th align="left">hostname</th> 
   <th align="left">ip</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">keepalived</td> 
   <td align="left">s1</td> 
   <td align="left">172.20.27.10</td> 
  </tr> 
  <tr> 
   <td align="left">keepalived</td> 
   <td align="left">s2</td> 
   <td align="left">172.20.27.11</td> 
  </tr> 
  <tr> 
   <td align="left">keepalived</td> 
   <td align="left">s3</td> 
   <td align="left">172.20.27.12</td> 
  </tr> 
 </tbody> 
</table>

### S1节点配置 ###

1.修改配置文件

[root@s1 ~]# vim /etc/keepalived/keepalived.conf 
    ! Configuration File for keepalived
    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                #需要关闭让keepalived产生iptables规则
       vrrp_garp_interval 0
       vrrp_gna_interval 0
    }
    
    vrrp_instance VI_1 {
        state Master
        interface ens33				#需要注意网卡名称，不一定都是ens33
        virtual_router_id 27
        priority 100                #需要注意各个节点的优先级，当主机点挂了之后，其余的节点会根据，优先级的高低选举出，新的主机点。
        advert_int 2
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        unicast_src_ip 172.20.27.10    
        unicast_peer {
        172.20.27.11                #单播配置时需要将所有的节点都加入
        172.20.27.12
        }
        virtual_ipaddress {
            172.20.27.100 dev ens33 label ens33:0
        }
    
    }

2.启动服务

\[root@s1 ~\]*\# `systemctl start keepalived`*

### s2节点配置 ###

1.修改配置文件

[root@s2 ~]# vim /etc/keepalived/keepalived.conf 
    ! Configuration File for keepalived
    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_script check_nginx {
        script "/etc/keepalived/check_nginx.sh"
    }
    
    vrrp_instance VI_1 {
        state BACKUP
        interface ens33
        virtual_router_id 27
        priority 80
        advert_int 2
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        unicast_src_ip 172.20.27.11
        unicast_peer {
        172.20.27.10
        172.20.27.12
        }
        virtual_ipaddress {
            172.20.27.100 dev ens33 label ens33:0
        }
        track_script {
            check_nginx
        } 
    }

2.启动服务

\[root@s2 ~\]*\# `systemctl start keepalived`*

### s3节点配置 ###

1.修改配置文件

[root@s3 ~]# vim /etc/keepalived/keepalived.conf 
    
    ! Configuration File for keepalived
    
    global_defs {
       notification_email {
         root@mylinuxops.com
       }
       notification_email_from root@mylinuxops.com
       smtp_server 172.0.0.1
       smtp_connect_timeout 30
       router_id s3.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 50
        advert_int 2
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        unicast_src_ip 172.20.27.12
        unicast_peer {
        172.20.27.10
        172.20.27.11
        }
        virtual_ipaddress {
            172.20.27.100 dev ens33 label ens33:0
        }
    }

2.启动服务

\[root@s2 ~\]*\# `systemctl start keepalived`*

#### 测试 ####

查看当前VIP所在主机

[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 283462  bytes 22421914 (21.3 MiB)
            RX errors 0  dropped 12  overruns 0  frame 0
            TX packets 50515  bytes 9459257 (9.0 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

vip在s1主机上，当s1节点挂了之后，由于s2节点的优先级高于s3，所以s2获得了vip

[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 271011  bytes 21681786 (20.6 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 16217  bytes 1380138 (1.3 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:29:4d: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

当s2节点也挂了之后，s3节点获得vip

[root@s3 ~]# ifconfig
    ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 172.20.27.12  netmask 255.255.0.0  broadcast 172.20.255.255
            inet6 fe80::20c:29ff:fe99:608a  prefixlen 64  scopeid 0x20<link>
            ether 00:0c:29:99:60:8a  txqueuelen 1000  (Ethernet)
            RX packets 20519  bytes 1491603 (1.4 MiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 1775  bytes 215565 (210.5 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:29:99:60:8a  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 106  bytes 8744 (8.5 KiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 106  bytes 8744 (8.5 KiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0