Mysql+keepalive高可用自動切換

Keepalive

Keepalived是HA cluster的一種實現方案，其以vrrp協議(Virtual Router Redundancy Protocol，即虛擬路由冗余協議)為實現基礎，在N台具有相同功能的路由器或服務器中選出一個master或多個backup，這些路由器或服務器會共用一個對外提供服務的VIP。在此HA cluster集群中，master主機會發送組播來跟backup主機進行通信確認雙方是否存活。當backup主機在指定的時間內沒有收到vrrp組播報文則認為master主機宕機了，此時就會在所有的backup主機中根據vrrp協議來選舉出新的master主機來保證服務的高可用性。

1、域名指向，域名只能指向一個固定IP，如果該IP綁定的機器宕機了，那么這個域名便無法訪問了；
2、數據庫服務指向，應用是通過一個固定的IP連接到數據庫，如果該IP宕機，也無法提供服務；

一般主要解決以上兩個問題，即keepalived+lvs+nginx和keepalive+mysql等等

keepalived主要有三個模塊，分別是ipvs wrapper、checkers和vrrp stack。

• ipvs wrapper模塊為keepalived的核心，負責主進程的啟動、維護以及全局配置文件的加載和解析。
• checkers負責健康檢查，包括常見的各種檢查方式。
• vrrp stack模塊是來實現VRRP協議的。
• IPVS wrapper 用來發送設定的規則到內核IPVS代碼。
• Netlink Reflector 用來設定 vrrp 的vip地址等。

 

---

1、安裝

keepalived源碼包下載地址：http://www.keepalived.org/download.html

說明文檔：https://www.keepalived.org/LVS-NAT-Keepalived-HOWTO.html

安裝環境

# yum install -y openssl-devel popt-devel  curl gcc  libnl3-devel net-snmp-devel  libnfnetlink-devel

下載安裝包，主機備機都要安裝

wget https://www.keepalived.org/software/keepalived-2.0.0.tar.gz 

解壓縮、編譯、安裝，過程中提示缺什么庫就安裝什么庫，然后再重新編譯安裝。

# tar -zxf keepalived-2.0.0.tar.gz 
# cd keepalived-2.0.0
#  ./configure --prefix=/usr/local/keepalived
# make && make install
# echo $?
0
#
# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
# cp ./keepalived/etc/init.d/keepalived /etc/init.d/
# mkdir /etc/keepalived
# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

---

2、配置

keepalived 只有一個配置文件 keepalived.conf，其中包含了三類配置區域。

• 全局配置 Global Configuration，包含了 global_defs（全局配置標識）、static_ipaddress（靜態地址）、static_routes（靜態路由） 區域配置項。

• VRRP 配置，包含了 vrrp_instance（VRRP 實例）、vrrp_sync_group（VRRP 同步組）、vrrp_script（VRRP 腳本） 、virtual_server 區域配置項。

  • vrrp_instance 用來定義對外提供服務的 VIP 區域及其相關屬性。
  • vrrp_rsync_group 用來定義 vrrp_intance 組，使得這個組內成員動作一致。例如兩個 vrrp_instance 同屬於一個 vrrp_rsync_group，那么其中一個vrrp_instance 發生故障切換時，另一個 vrrp_instance 也會跟着切換（即使這個 instance 沒有發生故障）

• vrrp_script 區域

  • 用來做健康檢查，當時檢查失敗時會將 vrrp_instance 的 priority 減少相應的值。
  • 首先在 vrrp_script 區域定義腳本名字和腳本執行的間隔和腳本執行的優先級變更。然后在實例 vrrp_instance 里面引用，有點類似腳本里面的函數引用一樣：先定義，后引用函數名。

 master

[root@nginx ~]# cat /etc/keepalived/keepalived.conf
global_defs {
    notification_email {                  #故障發生時給誰發郵件通知。
        root@localhost
        root@192.168.10.18
    }
    notification_email_from keepalived@localhost      #通知郵件的發出地址。
    smtp_server 127.0.0.1         #發現Email的smtp地址
    smtp_connect_timeout 30       #超時時間
    router_id node1               #運行keepalived的機器標識號，主從機必須不同
}

vrrp_instance VI_1 {
    state MASTER               #可以是 MASTER 或 BACKUP，不過當其他節點 keepalived 啟動時
                               #會將 Priority（優先級）比較大的節點選舉為 MASTER，因此該項其實沒有實質用途。
    interface eth1             #本機物理網卡，節點固有 IP（非 VIP）的網卡，用來發 VRRP 包。
    lvs_sync_daemon_inteface eth1    #綁定 lvs syncd 的網卡。
    virtual_router_id 151            #虛擬路由，主從機必需一致。設置 VRID，取值在 0-255 之間，用來區分多個 instance 的 VRRP 組播
                                     #（同一網段中 virtual_router_id 的值不能重復，否則會出錯）。
                                     #將決定多播的 MAC 地址
    priority 100          #用來選舉 master，要成為 master，這個選項的值最好高於其他機器 50 個點，
                          #該項取值范圍是 1-255（在此范圍之外會被識別成默認值 100）。
    advert_int 5          #發 VRRP 包的時間間隔，即多久進行一次 master 選舉（可以認為是健康查檢時間間隔，默認為 1 秒）。
    authentication {       #認證區域，保持master和backup一致
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {          #VIP（虛擬 IP 地址），隨着 state 的變化而增加刪除，
                                 #當 state 為 master 的時候就添加，當 state 為 backup 的時候刪除，
                                 #主要由優先級來決定的，和 state 設置的值沒有多大關系，可以設置多個 IP 地址。
        192.168.100.100 dev eth1   
    }
}

virtual_server 192.168.100.100 3306 {           #LVS配置，VIP
    delay_loop 6                                #服務輪詢的時間間隔
    lb_algo wrr                                 #LVS 調度算法
    lb_kind DR　　　　　　　　　　　　　　　　　　　　 #LVS 集群算法
    persistence_timeout 60                       #同一IP的鏈接50秒內被分配到同一台realserver
    protocol TCP                                 #用TCP協議檢查realserver狀態
    real_server 192.168.10.18 3306 {        #實際服務器的IP和端口
        weight 100
        notify_down /data/sh/mysql.sh
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 3306
        }
    }

}
[root@nginx ~]# 

backup

[root@mysql ~]# 
[root@mysql ~]# cat /etc/keepalived/keepalived.conf
global_defs {
    notification_email {
        root@localhost
        root@192.168.10.18
    }
    notification_email_from keepalived@localhost
    smtp_server 127.0.0.1
    smtp_connect_timeout 30
    router_id node2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth1
    lvs_sync_daemon_inteface eth1
    virtual_router_id 151
    priority 90
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.100.100 dev eth1
    }
}

virtual_server 192.168.100.100 3306 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 60
    protocol TCP
    real_server 192.168.10.23 3306 {
        weight 100
        notify_down /data/sh/mysql.sh
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 3306
        }
    }

}
[root@mysql ~]# 

在兩端/data/sh/mysql.sh建立關閉keepalived的腳本

[root@mysql ~]# cat /data/sh/mysql.sh 
pkill keepalived
[root@mysql ~]# 

---

3、啟動

master和backup都啟動keepalived服務

[root@nginx ~]# service keepalived start
Starting keepalived:                                       [  OK  ]
[root@nginx ~]# 
[root@nginx ~]# ps -ef | grep keep 
root     127942      1  0 12:27 ?        00:00:00 keepalived -D
root     127944 127942  0 12:27 ?        00:00:00 keepalived -D
root     127945 127942  0 12:27 ?        00:00:00 keepalived -D
root     130062 130014  0 14:27 pts/0    00:00:00 grep keep
[root@nginx ~]# 
[root@nginx ~]# 
[root@nginx ~]# netstat -lantup | grep keep
[root@nginx ~]# 

[root@mysql ~]# /etc/init.d/keepalived restart
Stopping keepalived:                                       [  OK  ]
Starting keepalived:                                       [  OK  ]
[root@mysql ~]# ps -ef | grep keep
root      49218      1  0 12:01 ?        00:00:00 keepalived -D
root      49220  49218  0 12:01 ?        00:00:00 keepalived -D
root      49221  49218  0 12:01 ?        00:00:00 keepalived -D
root      49223  48581  0 12:01 pts/3    00:00:00 grep keep
[root@mysql ~]# 
[root@mysql ~]# netstat -lantup | grep keep
tcp        0      1 192.168.10.23:58138         192.168.33.23:3306          SYN_SENT    49220/keepalived    
[root@mysql ~]# 

查看兩端的虛擬IP啟動情況，系統日志

Master端

[root@nginx ~]# 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: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:69:6e:c1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.18/24 brd 192.168.10.255 scope global eth1
   inet 192.168.100.100/32 scope global eth1
    inet6 fe80::20c:29ff:fe69:6ec1/64 scope link 
       valid_lft forever preferred_lft forever
[root@nginx ~]#

虛擬IP：192.168.100.100已經成功啟動

[root@nginx ~]# tail -fn 10 /var/log/messages6
Sep 20 15:13:22 nginx Keepalived_healthcheckers[419]: TCP connection to [192.168.10.18]:tcp:3306 success.
Sep 20 15:13:32 nginx Keepalived_vrrp[420]: (VI_1) Entering MASTER STATE
Sep 20 15:13:32 nginx Keepalived_vrrp[420]: (VI_1) setting protocol VIPs.
Sep 20 15:13:32 nginx Keepalived_vrrp[420]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:13:32 nginx Keepalived_vrrp[420]: (VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.100.100
Sep 20 15:13:32 nginx Keepalived_vrrp[420]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:13:32 nginx Keepalived_vrrp[420]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:13:32 nginx Keepalived_vrrp[420]: Sending gratuitous ARP on eth1 for 192.168.100.100

說明已經成功作為MASTER啟動，且發送ARP包傳輸

backup端

[root@mysql ~]# tail -fn 10 /var/log/messages
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: WARNING - default user 'keepalived_script' for script execution does not exist - please create.
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: Unknown keyword 'nb_get_retry'
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: Please add a #! shebang to script /data/sh/mysql.sh
Sep 20 15:25:37 mysql Keepalived_vrrp[52340]: (VI_1) removing protocol VIPs.
Sep 20 15:25:37 mysql Keepalived_vrrp[52340]: (VI_1) Entering BACKUP STATE (init)
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: SECURITY VIOLATION - check scripts are being executed but script_security not enabled.
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: Gained quorum 1+0=1 <= 100 for VS [192.168.100.100]:tcp:3306
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: Activating healthchecker for service [192.168.10.23]:tcp:3306 for VS [192.168.100.100]:tcp:3306
Sep 20 15:25:37 mysql Keepalived_vrrp[52340]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(8,9)]
Sep 20 15:25:43 mysql Keepalived_healthcheckers[52339]: TCP connection to [192.168.10.23]:tcp:3306 success.

 (VI_1) Entering BACKUP STATE (init)已作為backup機啟用

[root@mysql ~]# 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: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ad:ad:54 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.23/24 brd 192.168.10.255 scope global eth1
    inet6 fe80::20c:29ff:fead:ad54/64 scope link 
       valid_lft forever preferred_lft forever
[root@mysql ~]#

backup的IP情況

---

 

4、測試

當Master的MySQL服務意外掛掉后，會自動啟用backup的Mysql繼續為系統提供支持。

[root@nginx ~]# service mysqld stop
Stopping mysqld:                                           [  OK  ]
[root@nginx ~]# 
[root@nginx ~]# 
[root@nginx ~]# 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: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:69:6e:c1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.18/24 brd 192.168.10.255 scope global eth1
    inet6 fe80::20c:29ff:fe69:6ec1/64 scope link 
       valid_lft forever preferred_lft forever
[root@nginx ~]# 
[root@nginx ~]# 
[root@nginx ~]# 
[root@nginx ~]# tail -fn 10 /var/log/messages
Sep 20 15:36:44 nginx Keepalived_healthcheckers[419]: Error processing RCPT cmd on SMTP server [127.0.0.1]:25. SMTP status code = 501
Sep 20 15:36:44 nginx Keepalived_healthcheckers[419]: Can not read data from remote SMTP server [127.0.0.1]:25.
Sep 20 15:36:44 nginx Keepalived[417]: Stopping
Sep 20 15:36:44 nginx kernel: IPVS: __ip_vs_del_service: enter
Sep 20 15:36:44 nginx Keepalived_vrrp[420]: (VI_1) sent 0 priority
Sep 20 15:36:44 nginx Keepalived_vrrp[420]: (VI_1) removing protocol VIPs.
Sep 20 15:36:44 nginx Keepalived_healthcheckers[419]: Shutting down service [192.168.10.18]:tcp:3306 from VS [192.168.100.100]:tcp:3306
Sep 20 15:36:44 nginx Keepalived_healthcheckers[419]: Stopped
Sep 20 15:36:45 nginx Keepalived_vrrp[420]: Stopped
Sep 20 15:36:45 nginx Keepalived[417]: Stopped Keepalived v2.0.0 (05/27,2018)
^C
[root@nginx ~]# ps -ef  | grep keep
root       1127 130014  0 15:40 pts/0    00:00:00 grep keep
[root@nginx ~]# 

Master 測試關閉mysql服務，虛擬IP停止發送ARP包，keepalived服務終止

[root@mysql ~]# 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: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ad:ad:54 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.23/24 brd 192.168.10.255 scope global eth1
    inet 192.168.100.100/32 scope global eth1
    inet6 fe80::20c:29ff:fead:ad54/64 scope link 
       valid_lft forever preferred_lft forever
[root@mysql ~]# 
[root@mysql ~]# tail -fn 20 /var/log/messages
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: SECURITY VIOLATION - check scripts are being executed but script_security not enabled.
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: Gained quorum 1+0=1 <= 100 for VS [192.168.100.100]:tcp:3306
Sep 20 15:25:37 mysql Keepalived_healthcheckers[52339]: Activating healthchecker for service [192.168.10.23]:tcp:3306 for VS [192.168.100.100]:tcp:3306
Sep 20 15:25:37 mysql Keepalived_vrrp[52340]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(8,9)]
Sep 20 15:25:43 mysql Keepalived_healthcheckers[52339]: TCP connection to [192.168.10.23]:tcp:3306 success.
Sep 20 15:36:44 mysql Keepalived_vrrp[52340]: (VI_1) Backup received priority 0 advertisement
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: (VI_1) Entering MASTER STATE
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: (VI_1) setting protocol VIPs.
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: (VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: (VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
ps^C
[root@mysql ~]# 
[root@mysql ~]# ps -ef | grep keepalived
root      52337      1  0 15:25 ?        00:00:00 keepalived -D
root      52339  52337  0 15:25 ?        00:00:00 keepalived -D
root      52340  52337  0 15:25 ?        00:00:00 keepalived -D
root      52760  51101  0 15:42 pts/0    00:00:00 grep keepalived
[root@mysql ~]# 

(VI_1) Entering MASTER STATE，backup機成為Master，繼續為系統提供mysql服務，測試成功。
重啟Master主機的mysql服務后，Master主機重新成為master，備機重新成為備機

[root@nginx ~]# 
[root@nginx ~]# service keepalived restasrt
Usage: /etc/init.d/keepalived {start|stop|reload|restart|condrestart|status}
[root@nginx ~]# service keepalived restart
Stopping keepalived:                                       [FAILED]
Starting keepalived:                                       [  OK  ]
[root@nginx ~]# 
[root@nginx ~]# 
[root@nginx ~]# 
[root@nginx ~]# tail -fn 10 /var/log/messages
Sep 20 15:44:35 nginx Keepalived_healthcheckers[1409]: Gained quorum 1+0=1 <= 100 for VS [192.168.100.100]:tcp:3306
Sep 20 15:44:35 nginx Keepalived_vrrp[1410]: Unknown keyword 'lvs_sync_daemon_inteface'
Sep 20 15:44:35 nginx Keepalived_vrrp[1410]: Assigned address 192.168.10.18 for interface eth1
Sep 20 15:44:35 nginx Keepalived_healthcheckers[1409]: Activating healthchecker for service [192.168.10.18]:tcp:3306 for VS [192.168.100.100]:tcp:3306
Sep 20 15:44:35 nginx Keepalived_vrrp[1410]: Assigned address fe80::20c:29ff:fe69:6ec1 for interface eth1
Sep 20 15:44:35 nginx Keepalived_vrrp[1410]: Registering gratuitous ARP shared channel
Sep 20 15:44:35 nginx Keepalived_vrrp[1410]: (VI_1) removing protocol VIPs.
Sep 20 15:44:35 nginx Keepalived_vrrp[1410]: (VI_1) Entering BACKUP STATE (init)
Sep 20 15:44:35 nginx Keepalived_vrrp[1410]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(8,9)]
Sep 20 15:44:36 nginx Keepalived_vrrp[1410]: (VI_1) received lower priority (90) advert from 192.168.10.23 - discarding
Sep 20 15:44:41 nginx Keepalived_vrrp[1410]: (VI_1) received lower priority (90) advert from 192.168.10.23 - discarding
Sep 20 15:44:41 nginx Keepalived_healthcheckers[1409]: TCP connection to [192.168.10.18]:tcp:3306 success.
Sep 20 15:44:46 nginx Keepalived_vrrp[1410]: (VI_1) received lower priority (90) advert from 192.168.10.23 - discarding
Sep 20 15:44:50 nginx Keepalived_vrrp[1410]: (VI_1) Entering MASTER STATE
Sep 20 15:44:50 nginx Keepalived_vrrp[1410]: (VI_1) setting protocol VIPs.
Sep 20 15:44:50 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:50 nginx Keepalived_vrrp[1410]: (VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.100.100
Sep 20 15:44:50 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:50 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:50 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:50 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:55 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:55 nginx Keepalived_vrrp[1410]: (VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.100.100
Sep 20 15:44:55 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:55 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:55 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:55 nginx Keepalived_vrrp[1410]: Sending gratuitous ARP on eth1 for 192.168.100.100
^C
[root@nginx ~]# 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: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:69:6e:c1 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.18/24 brd 192.168.10.255 scope global eth1
    inet 192.168.100.100/32 scope global eth1
    inet6 fe80::20c:29ff:fe69:6ec1/64 scope link 
       valid_lft forever preferred_lft forever
[root@nginx ~]# 

[root@mysql ~]# 
[root@mysql ~]# tail -fn 20 /var/log/messages
Sep 20 15:25:37 mysql Keepalived_vrrp[52340]: VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(8,9)]
Sep 20 15:25:43 mysql Keepalived_healthcheckers[52339]: TCP connection to [192.168.10.23]:tcp:3306 success.
Sep 20 15:36:44 mysql Keepalived_vrrp[52340]: (VI_1) Backup received priority 0 advertisement
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: (VI_1) Entering MASTER STATE
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: (VI_1) setting protocol VIPs.
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: (VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:45 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: (VI_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:36:50 mysql Keepalived_vrrp[52340]: Sending gratuitous ARP on eth1 for 192.168.100.100
Sep 20 15:44:50 mysql Keepalived_vrrp[52340]: (VI_1) Master received advert from 192.168.10.18 with higher priority 100, ours 90
Sep 20 15:44:50 mysql Keepalived_vrrp[52340]: (VI_1) Entering BACKUP STATE
Sep 20 15:44:50 mysql Keepalived_vrrp[52340]: (VI_1) removing protocol VIPs.
^C
[root@mysql ~]# 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: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:ad:ad:54 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.23/24 brd 192.168.10.255 scope global eth1
    inet6 fe80::20c:29ff:fead:ad54/64 scope link 
       valid_lft forever preferred_lft forever
[root@mysql ~]#