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keepalived 多节点配置方法

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keepalived 多节点配置方法

准备3台主机

server hostname ip
keepalived s1 172.20.27.10
keepalived s2 172.20.27.11
keepalived s3 172.20.27.12

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

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