keepalived 多节点设置

keepalived 多节点设置

目的： 进一步提高keepalived 可用性

设计：有3台keepalived 服务器 192.168.1.106 192.168.1.107 192.168.1.108。vip 是192.168.1.249

效果：只要有一台keepalive 运行正常。vip 就可以访问

server	hostname	ip
keepalived	z6	192.168.1.106
keepalived	z7	192.168.1.107
keepalived	z8	192.168.1.108

z6：

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 50
    nopreempt
    priority 60
    advert_int 1
    unicast_src_ip 192.168.1.106
    unicast_peer {
        192.168.1.107
        192.168.1.108
    }
    authentication {
        auth_type PASS
        auth_pass 1111qwer

    }
    virtual_ipaddress {
        192.168.7.249/24  dev eth0 label eth0:1
    }
}

z7:

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 50
    priority 70
    advert_int 1
    nopreempt
    unicast_src_ip 192.168.1.107
    unicast_peer {
        192.168.1.106
        192.168.1.108
    }

    authentication {
        auth_type PASS
        auth_pass 1111qwer

    }
    virtual_ipaddress {
        192.168.7.249/24  dev eth0 label eth0:1
    }
}

z8:

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 50
    priority 80
    advert_int 1
    nopreempt
    unicast_src_ip 192.168.1.108
    unicast_peer {
        192.168.1.106
        192.168.1.107
    }

    authentication {
        auth_type PASS
        auth_pass 1111qwer

    }
    virtual_ipaddress {
        192.168.7.249/24  dev eth0 label eth0:1
    }
}

非抢占模式 默认 是谁先开启vip 运行在哪台机器上的。如果发生故障转移，再比较priority

我这里先开启的先开启是z8

验证：

当停止z8 时 vip 会跑在z7 上

Mar 24 16:52:48 z7 Keepalived_vrrp[1200]: VRRP_Instance(VI_1) Entering BACKUP STATE
Mar 24 16:56:02 z7 Keepalived_vrrp[1200]: VRRP_Instance(VI_1) Transition to MASTER STATE
Mar 24 16:56:03 z7 Keepalived_vrrp[1200]: VRRP_Instance(VI_1) Entering MASTER STATE

当停止z7 上 vip 会运行在 z6 上

Mar 24 16:55:44 z6 systemd[1]: Started Keepalive Daemon (LVS and VRRP).
Mar 24 16:55:44 z6 Keepalived_healthcheckers[1138]: Opening file '/etc/keepalived/keepalived.conf'.
Mar 24 16:55:44 z6 Keepalived_vrrp[1139]: Registering Kernel netlink reflector
Mar 24 16:55:44 z6 Keepalived_vrrp[1139]: Registering Kernel netlink command channel
Mar 24 16:55:44 z6 Keepalived_vrrp[1139]: Registering gratuitous ARP shared channel
Mar 24 16:55:44 z6 Keepalived_vrrp[1139]: Opening file '/etc/keepalived/keepalived.conf'.
Mar 24 16:55:44 z6 Keepalived_vrrp[1139]: Using LinkWatch kernel netlink reflector...
Mar 24 16:55:44 z6 Keepalived_vrrp[1139]: VRRP_Instance(VI_1) Entering BACKUP STATE
Mar 24 16:56:43 z6 Keepalived_vrrp[1139]: VRRP_Instance(VI_1) Transition to MASTER STATE
Mar 24 16:56:44 z6 Keepalived_vrrp[1139]: VRRP_Instance(VI_1) Entering MASTER STATE

然后把z7、z8重启 ，当停止z6 ，vip 会运行在z8 上

Mar 24 17:10:09 z8 systemd[1]: Started Keepalive Daemon (LVS and VRRP).
Mar 24 17:10:09 z8 Keepalived[1736]: Starting VRRP child process, pid=1738
Mar 24 17:10:09 z8 Keepalived_healthcheckers[1737]: Opening file '/etc/keepalived/keepalived.conf'.
Mar 24 17:10:09 z8 Keepalived_vrrp[1738]: Registering Kernel netlink reflector
Mar 24 17:10:09 z8 Keepalived_vrrp[1738]: Registering Kernel netlink command channel
Mar 24 17:10:09 z8 Keepalived_vrrp[1738]: Registering gratuitous ARP shared channel
Mar 24 17:10:09 z8 Keepalived_vrrp[1738]: Opening file '/etc/keepalived/keepalived.conf'.
Mar 24 17:10:09 z8 Keepalived_vrrp[1738]: Using LinkWatch kernel netlink reflector...
Mar 24 17:10:09 z8 Keepalived_vrrp[1738]: VRRP_Instance(VI_1) Entering BACKUP STATE
Mar 24 17:11:08 z8 Keepalived_vrrp[1738]: VRRP_Instance(VI_1) Transition to MASTER STATE
Mar 24 17:11:09 z8 Keepalived_vrrp[1738]: VRRP_Instance(VI_1) Entering MASTER STATE