keepalived服务挂了怎么办

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mob64ca13fc5fb6 2025-01-30 21:48:39

文章标签 keepalived服务挂了怎么办网络后端运维 IP 文章分类 运维

上篇博客介绍了lvs，前面提到lvs是基于tcp4层，不具备健康检查功能，对于前端的访问，lvs不管后端服务状态，直接把请求扔给后端。如果后端服务不可用，lvs仍然会把访问请求扔给不可用的后端，对于高可用服务来说，无疑是不可接受的。keepalive为lvs应运而生，keepalive可对后端的服务进行健康检查，还可以对提供高可用的lvs（主备节点）健康检查，出现故障时，自动切换。但keepalive的使用又不只局限用于lvs。它能对服务健康检查，从而实现服务高可用。

keepalive是基于vrrp协议在linux主机上以守护进程方式，根据配置文件实现健康检查。

再说，VRRP是一种选择协议，它可以把一个虚拟路由器的责任动态分配到局域网上的VRRP路由器中的一台。控制虚拟路由器IP地址的VRRP路由器称为主路由器，它负责转发数据包到这些虚拟IP地址。一旦主路由器不可用，这种选择过程就提供了动态的故障转移机制，这就允许虚拟路由器的IP地址可以作为终端主机的默认第一跳路由器。

keepalive通过组播，单播等方式（自定义），实现keepalive主备推选。工作模式分为抢占和非抢占（通过参数nopreempt来控制）。

抢占模式：主服务正常工作时，虚拟IP会在主上，备不提供服务，当主服务优先级低于备的时候，备会自动抢占虚拟IP，这时，主不提供服务，备提供服务。也就是说，工作在抢占模式下，不分主备，只管优先级。

非抢占模式：当keepalive启动后，主始终是主，不管主备优先级，只有主不提供服务时，备才接管虚拟IP，提供服务。

keepalive正常工作需要注意的

1、主机的主机名，各节点之间能通过主机名解析

2、各节点之间的时间需要保持一致

3、iptables与selinux

keepalive配置文件：/etc/keepalived/keepalived.conf

分3个部分：

global configuration

keepalive配置段：vrrpd configuration

lvs配置段：lvs configuration

配置keepalive需要注意：

1、各个节点之间，尽量能通过主机解析

2、各个节点之后的时间，尽量保持一致

3、关闭iptables和selinux，免得带来影响

首先实现keepalive+nginx高可用，一主一备

正常情况下，只有其中一主可以对外工作，主down掉时，备顶替主对外提供服务

10.0.0.50的keepalive配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalive@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_mcast_group4  224.0.0.18
}
vrrp_script chk_down {   #用于关闭keepalive服务
    script "[[ -f /etc/keepalived/down ]]&& exit 1 ||exit 0"
    interval 1
    weight -2
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 199
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.100
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}

10.0.0.51的keepalive配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
    root@localhost
   }
   notification_email_from keepalive@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_mcast_group4  224.0.0.18
}
vrrp_script chk_down {
    script "[[ -f /etc/keepalived/down ]]&& exit 1||exit 0"
    interval 1
    weight -2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 199
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.100
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}

重启服务后，效果如下

[root@lvs1 ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c6:0c:57 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.50/24 brd 10.0.0.255 scope global eth0
    inet 172.20.0.100/32 scope global eth0   #已经在10.0.0.50上得到VIP了
    inet6 fe80::20c:29ff:fec6:c57/64 scope link 
       valid_lft forever preferred_lft forever
###远程主机上curl一下vip
[root@centos6-tes3 ~]# curl 172.20.0.100
this is web from IP 50
[root@centos6-tes3 ~]# curl 172.20.0.100
this is web from IP 50  #能够得到访问到

down掉10.0.0.50上的keepalive服务

[root@lvs1 keepalived]# touch down
[root@lvs1 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c6:0c:57 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.50/24 brd 10.0.0.255 scope global eth0
    inet6 fe80::20c:29ff:fec6:c57/64 scope link 
       valid_lft forever preferred_lft forever
#已经没有vip地址，去远程主机上curl下
[root@centos6-tes3 ~]# curl 172.20.0.100
this is web from IP 51
[root@centos6-tes3 ~]# curl 172.20.0.100
this is web from IP 51    #转移到10.0.0.51上面去了

keepalive+nginx 双主模型

10.0.0.50keepalive配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalive@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_mcast_group4  224.0.0.18
}
vrrp_script chk_down {
    script "[[ -f /etc/keepalived/down ]]&& exit 1 ||exit 0"
    interval 1
    weight -2
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 199
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.100
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}
vrrp_instance VI_2 {
    state BACKUP
    interface eth0
    virtual_router_id 200
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.101
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}

10.0.0.51keepalive配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
    root@localhost
   }
   notification_email_from keepalive@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_mcast_group4  224.0.0.18
}
vrrp_script chk_down {
    script "[[ -f /etc/keepalived/down ]]&& exit 1||exit 0"
    interval 1
    weight -2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 199
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.100
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}
vrrp_instance VI_2 {
    state MASTER
    interface eth0
    virtual_router_id 200
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.101
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}

实验结果

[root@lvs1 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c6:0c:57 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.50/24 brd 10.0.0.255 scope global eth0
    inet 172.20.0.100/32 scope global eth0
    inet6 fe80::20c:29ff:fec6:c57/64 scope link 
       valid_lft forever preferred_lft forever
[root@lvs2 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:97:67:2a brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.51/24 brd 10.0.0.255 scope global eth0
    inet 172.20.0.101/32 scope global eth0
    inet6 fe80::20c:29ff:fe97:672a/64 scope link 
       valid_lft forever preferred_lft forever
在远程主机curl一下172.20.0.100和172.20.0.101
[root@centos6-tes3 ~]# curl 172.20.0.100
this is web from IP 50
[root@centos6-tes3 ~]# curl 172.20.0.101
this is web from IP 51

down掉10.0.0.50的keepalive，测试VIP是否会转移

[root@lvs1 keepalived]# touch down
[root@lvs1 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c6:0c:57 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.50/24 brd 10.0.0.255 scope global eth0
    inet6 fe80::20c:29ff:fec6:c57/64 scope link 
       valid_lft forever preferred_lft forever
[root@lvs2 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:97:67:2a brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.51/24 brd 10.0.0.255 scope global eth0
    inet 172.20.0.101/32 scope global eth0
    inet 172.20.0.100/32 scope global eth0
    inet6 fe80::20c:29ff:fe97:672a/64 scope link 
       valid_lft forever preferred_lft forever     
远程主机上分别curl 172.20.0.100和172.20.0.101
[root@centos6-tes3 ~]# curl 172.20.0.100
this is web from IP 51
[root@centos6-tes3 ~]# curl 172.20.0.101
this is web from IP 51

在10.0.0.50上删掉down文件，测试172.20.0.100会不会转移回来

[root@lvs1 keepalived]# rm down 
rm: remove regular empty file `down'? y
[root@lvs1 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c6:0c:57 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.50/24 brd 10.0.0.255 scope global eth0
    inet 172.20.0.100/32 scope global eth0
    inet6 fe80::20c:29ff:fec6:c57/64 scope link 
       valid_lft forever preferred_lft forever
远程主机上curl 172.20.0.100
[root@centos6-tes3 ~]# curl 172.20.0.100
this is web from IP 50 
可以上实验实现了双主，负载。

keepalive+lvs实现双主负载

在keepalive上安装好lvs，以及把后端的web服务器配置好vip

web1，web2网络配置

echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore

在lo上配置ip别名

ifconfiglo:0 10.0.0.100/32 broadcast 10.0.0.100 up
ifconfiglo:1 10.0.0.101/32 broadcast 10.0.0.101 up

添加lo到网卡的路由

route add -host 10.0.0.100 dev lo:0
route add -host 10.0.0.101 dev lo:1

10.0.0.50keepalive配置

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalive@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_mcast_group4  224.0.0.18
   vrrp_mcast_group5  224.0.0.19
}
vrrp_script chk_down {
    script "[[ -f /etc/keepalived/down ]]&& exit 1 ||exit 0"
    interval 1
    weight -2
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 199
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.100/16 dev eth0 label eth0:0
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}
virtual_server 172.20.0.100 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
#   persistence_timeout 50
    protocol TCP

    real_server 10.0.0.91 80 {
    HTTP_GET {
        url {
            path /
            status_code 200
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
    real_server 10.0.0.92 80 {
    HTTP_GET {
        url {
            path /
            status_code 200
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
}
vrrp_instance VI_2 {
    state BACKUP
    interface eth0
    virtual_router_id 200
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.101/16 dev eth0 label eth0:1
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}

virtual_server 172.20.0.101 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
#   persistence_timeout 50
    protocol TCP

    real_server 10.0.0.91 80 {
    HTTP_GET {
        url {
            path /
            status_code 200
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
    real_server 10.0.0.92 80 {
    HTTP_GET {
        url {
            path /
            status_code 200
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
}

10.0.0.51keepalive配置文件

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from keepalive@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_mcast_group4  224.0.0.18
   vrrp_mcast_group5  224.0.0.19
}
vrrp_script chk_down {
    script "[[ -f /etc/keepalived/down ]]&& exit 1 ||exit 0"
    interval 1
    weight -2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 199
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.100/16 dev eth0 label eth0:0
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}
virtual_server 172.20.0.100 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
#   persistence_timeout 50
    protocol TCP

    real_server 10.0.0.91 80 {
    HTTP_GET {
        url {
            path /
            status_code 200
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
    real_server 10.0.0.92 80 {
    HTTP_GET {
        url {
            path /
            status_code 200
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
}
vrrp_instance VI_2 {
    state MASTER
    interface eth0
    virtual_router_id 200
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass c09060332be9bb06
    }
    virtual_ipaddress {
        172.20.0.101/16 dev eth0 label eth0:1
    }
    track_interface {
        eth0
    }
    track_script {
        chk_down
    }
}

virtual_server 172.20.0.101 80 {
    delay_loop 3
    lb_algo rr
    lb_kind DR
#   persistence_timeout 50
    protocol TCP

    real_server 10.0.0.91 80 {
    HTTP_GET {
        url {
            path /
            status_code 200
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
    real_server 10.0.0.92 80 {
    HTTP_GET {
        url {
            path /
            status_code 200
        }
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        }
    }
}

停掉keepalive，重启network，清理掉ipvs规则，最后再启动keepalive服务

service keepalived start
ipvsadm -C
service network restart
service keepalived start

在10.0.0.50和10.0.0.51上面分别查看ip和ipvs规则

[root@lvs1 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c6:0c:57 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.50/24 brd 10.0.0.255 scope global eth0
    inet 172.20.0.100/16 scope global eth0:0
    inet6 fe80::20c:29ff:fec6:c57/64 scope link 
       valid_lft forever preferred_lft forever
[root@lvs1 keepalived]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.20.0.100:80 rr
  -> 10.0.0.91:80                 Route   1      0          0         
  -> 10.0.0.92:80                 Route   1      0          0         
TCP  172.20.0.101:80 rr
  -> 10.0.0.91:80                 Route   1      0          0         
  -> 10.0.0.92:80                 Route   1      0          0         
[root@lvs2 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:97:67:2a brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.51/24 brd 10.0.0.255 scope global eth0
    inet 172.20.0.101/16 scope global eth0:1
    inet6 fe80::20c:29ff:fe97:672a/64 scope link 
       valid_lft forever preferred_lft forever
[root@lvs2 keepalived]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.20.0.100:80 rr
  -> 10.0.0.91:80                 Route   1      0          0         
  -> 10.0.0.92:80                 Route   1      0          0         
TCP  172.20.0.101:80 rr
  -> 10.0.0.91:80                 Route   1      0          0         
  -> 10.0.0.92:80                 Route   1      0          0

每个lvs节点都有一个VIP，再通过远程主机curl每个vip，是否能负载均衡

[root@centos6-tes3 ~]# curl 172.20.0.100
this is 92 page
[root@centos6-tes3 ~]# curl 172.20.0.100
this is 91 page
[root@centos6-tes3 ~]# curl 172.20.0.100
this is 92 page
[root@centos6-tes3 ~]# curl 172.20.0.101
this is 92 page
[root@centos6-tes3 ~]# curl 172.20.0.101
this is 91 page

最后down掉10.0.0.50，测试所有的VIP是否都转移到10.0.0.51,且两个VIP都能均衡

[root@lvs1 keepalived]# touch down #down 10.0.0.50的keepalive服务
[root@lvs1 keepalived]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c6:0c:57 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.50/24 brd 10.0.0.255 scope global eth0
    inet6 fe80::20c:29ff:fec6:c57/64 scope link 
       valid_lft forever preferred_lft forever
[root@lvs1 keepalived]# ipvsadm -L -n  #但是ipvs的规则不会清除
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.20.0.100:80 rr
  -> 10.0.0.91:80                 Route   1      0          0         
  -> 10.0.0.92:80                 Route   1      0          0         
TCP  172.20.0.101:80 rr
  -> 10.0.0.91:80                 Route   1      0          0         
  -> 10.0.0.92:80                 Route   1      0          0  
[root@lvs2 keepalived]# ip addr  #查看VIP全部都转移到10.0.0.51这台上面来了。
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:97:67:2a brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.51/24 brd 10.0.0.255 scope global eth0
    inet 172.20.0.101/16 scope global eth0:1
    inet 172.20.0.100/16 scope global secondary eth0:0
    inet6 fe80::20c:29ff:fe97:672a/64 scope link 
       valid_lft forever preferred_lft forever
[root@lvs2 keepalived]# ipvsadm -L -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.20.0.100:80 rr
  -> 10.0.0.91:80                 Route   1      0          0         
  -> 10.0.0.92:80                 Route   1      0          0         
TCP  172.20.0.101:80 rr
  -> 10.0.0.91:80                 Route   1      0          0         
  -> 10.0.0.92:80                 Route   1      0          0  
在远程主机curl测试2个vip是否可以使用，且能负载
[root@centos6-tes3 ~]# curl 172.20.0.100
this is 92 page
[root@centos6-tes3 ~]# curl 172.20.0.100
this is 91 page
[root@centos6-tes3 ~]# curl 172.20.0.101
this is 92 page
[root@centos6-tes3 ~]# curl 172.20.0.101
this is 91 page

一切正常，说明通过2个VIP，可以实现双主+双备，同时实现负载和冗余的目的

转载于:https://blog.51cto.com/iznowow/1703825

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