Keepalived 双网络(内外网)故障同步漂移主备模式

Posted by Sunday on 2018-08-13

前言

在生产环境当中，内网与公网都是独立分开的，因此内网和公网不用同步漂移，例如：Keepalived+LVS-DR、Keepalived+Nginx、Keepalived+HAProxy 都无需同步漂移。

注：Keepalived+LVS-NAT模式除外。

架构图

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    +------+              +--------+
    |Client|     >>>      |Internet|
    +------+              +--------+
                              /\
                  +-----------------------+
                  | 公网VIP1:172.16.20.91 |
                  +-----------------------+
                      /                \
+--------------------------+      +-------------------------+
|公网VIP:Master  (eth2)    |<---->|公网VIP:BACKUP  (eth2)    |
|公网:172.16.20.101(eth2)  |      |公网:172.16.20.102(eth2)  |                  
|--------------------------|多播IP|--------------------------| 
|KA+Lvs/Nginx/HAProxy      |      |KA+Lvs/Nginx/HAProxy     |
|内网VIP:Master  (eth1)    |      |内网VIP:BACKUP  (eth1)    |
|内网:192.168.10.101 (eth1)|<---->|内网:192.168.10.102 (eth1)|
+-----------------------+      +----------------------------+
                     \                /
                  +-----------------------+
                  |内网VIP1:192.168.10.91  |
                  +-----------------------+
                           \/
                     +------------+
                     | APP Server |
                     +------------+

keepalived配置

Master配置

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global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka101
   vrrp_mcast_group4 224.0.0.111
}

vrrp_sync_group VG_1 {
    group {
        Extranet_1
        Intranet_1
    }
}

vrrp_instance Extranet_1 {
    state MASTER
    interface eth0
    virtual_router_id 171
    priority 100
    advert_int 1    
    authentication {
        auth_type PASS
        auth_pass sunday0
    }
    virtual_ipaddress {
        172.16.20.91/16
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance Intranet_1 {
    state MASTER
    interface eth1
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass sunday1
    }
    virtual_ipaddress {
        192.168.10.91
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

Backup配置

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global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka102
   vrrp_mcast_group4 224.0.0.111
}

vrrp_sync_group VG_1 {
    group {
        Extranet_1
        Intranet_1
    }
}

vrrp_instance Extranet_1 {
    state BACKUP
    interface eth0
    virtual_router_id 171
    priority 100
    advert_int 1    
    authentication {
        auth_type PASS
        auth_pass sunday0
    }
    virtual_ipaddress {
        172.16.20.91/16
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
vrrp_instance Intranet_1 {
    state BACKUP
    interface eth1
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass sunday1
    }
    virtual_ipaddress {
        192.168.10.91
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

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Aug 13 18:31:38 node1 Keepalived_vrrp[1133]: Opening file '/etc/keepalived/keepalived.conf'.
Aug 13 18:31:38 node1 Keepalived_vrrp[1133]: Unknown keyword 'dynamic_interfaces'
Aug 13 18:31:38 node1 Keepalived_vrrp[1133]: WARNING - default user 'keepalived_script' for script execution does not exist - please create.
Aug 13 18:31:38 node1 Keepalived_vrrp[1133]: (Intranet_1): Cannot find an IP address to use for interface eth1
Aug 13 18:31:39 node1 Keepalived[1131]: Keepalived_vrrp exited with permanent error CONFIG. Terminating
解决：ifconfig eth1 172.16.20.101/16 up
eth1配置IP，因为如果接口没有IP，keepalived将以FAULT状态启动，keepalived 2.0.5以上版本,只需将dynamic_interfaces添加到global_defs即可

https://serverfault.com/questions/918642/start-keepalived-without-ip-on-interface

https://renwole.com/archives/1097

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