Keepalievd的安装配置跟切换模拟
2.1安装环境介绍目前打算在192.168.6.243和192.168.6.244这两台机器上安装Keepalived（首先需要先安装好MySQL，配置好Master-Master主主复制），虚拟IP（VIP）是192.168.6.252，在一台机器上的MySQL出现故障后，VIP自动地漂移到另外一台机器上。查看下192.168.6.243的环境：OS： Linuxmds-Master
2.1安装环境介绍
目前打算在192.168.6.243和192.168.6.244这两台机器上安装Keepalived（首先需要先安装好MySQL，配置好Master-Master主主复制），虚拟IP（VIP）是192.168.6.252，在一台机器上的MySQL出现故障后，VIP自动地漂移到另外一台机器上。
查看下192.168.6.243的环境：
OS： Linuxmds-Master 2.6.18-238.el5 #1 SMP Sun Dec 19 14:22:44 EST 2010 x86_64 x86_64x86_64 GNU/Linux
CPU：8*Intel(R)Xeon(R) CPU E5506 @ 2.13GHz
Mem：32G
Keepalived的相关信息：
Version：1.2.1（注意：不要使用最新版本1.2.2，编译有错误）
下载地址：http://www.keepalived.org/download.html
MySQL的相关信息
Version：5.1.47+XtraDB
MySQL_Install_Dictory： /usr/local/mysql
MySQL_Config_File：/home/mysql/mysq/my1.cnf
2.2安装过程
2.1解压keepalived-1.2.1.tar.gz
[mysql@mds-Master tool]$ cd /home/wangwei/tools
[mysql@mds-Master tool]$ tar xvzf keepalived-1.2.1.tar.gz
2.2编译
[wangwei@mds-Masterkeepalived-1.2.1]$./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-238.el5-x86_64
编译出错
configure: error:
!!! OpenSSLis not properly installed on your system. !!!
!!! Can notinclude OpenSSL headers files. !!!
说明系统中没有安装OpenSSL
那就安装下OpenSS:L吧，出错
[mysql@mds-Master tool]# yum install openssl-devel
Loaded plugins: rhnplugin, security
This system is not registered with RHN
原因是linux没有在红帽网络上注册，所以无法下载上面的软件包，替代方案可以使用centos（使用中国科技大学的源 http://mirror.centos.org），具体如何配置我就不写了。
配置完毕后，使用yum安装openssl-devel：
[root@mds-Master tools]# yum install openssl-devel
Dependency Installed:
e2fsprogs-devel.x86_64 0:1.39-23.el5_5.1 keyutils-libs-devel.x86_64 0:1.2-1.el5 krb5-devel.x86_64 0:1.6.1-55.el5_6.2
libselinux-devel.x86_64 0:1.33.4-5.7.el5 libsepol-devel.x86_64 0:1.15.2-3.el5 zlib-devel.x86_64 0:1.2.3-3
Complete
再次编译
[root@mds-Master keepalived-1.2.1]#./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18-238.el5-x86_64
编译后的信息如下：
Keepalived configuration
------------------------
Keepalived version : 1.2.1
Compiler : gcc
Compiler flags : -g -O2 -DETHERTYPE_IPV6=0x86dd
Extra Lib : -lpopt -lssl -lcrypto
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
Use VRRP Framework : Yes
Use Debug flags : No
Keepalived的安装路径为：/usr/local/keepalived，--with-kernel-dir表示指定Linux的内核位置，因为Keepalived是建立在LVS之上的（Linux2.4内核以后，已经完全内置了LVS的各个功能模块，无需给内核打任何补丁，可以直接使用LVS提供的各种功能，关于LVS是什么东东？可以百度之，也算是国人对Linux的一大贡献，LVS的作者是毕业国防科技大学的章文嵩博士，现就职于淘宝网）。
2.3执行make 操作
[root@mds-Master keepalived-1.2.1]# make
Make complete
make[1]: Leaving directory`/home/wangwei/tools/keepalived-1.2.1/genhash'
Make complete
2.4执行make install 操作
[root@mds-Masterkeepalived-1.2.1]# make install
make -C keepalived install
。。。。。。。。。。。。。。。。
install -m 644 ../doc/man/man1/genhash.1 /usr/local/keepalived/share/man/man1
make[1]: Leaving directory`/home/wangwei/tools/keepalived-1.2.1/genhash'
这样的话，安装就告一段落了，在192.168.6.243上也安装同样版本的Keepalived。
2.5查看安装路径的文件
[root@mds-Master ~]# ls -lh /usr/local/keepalived/
total 16K
drwxr-xr-x 2 root root 4.0K Jul 5 08:54 bin
drwxr-xr-x 5 root root 4.0K Jul 5 08:54 etc
drwxr-xr-x 2 root root 4.0K Jul 5 08:54 sbin
drwxr-xr-x 3 root root 4.0K Jul 5 08:54 share
2.6查看帮助
[root@mds-Master ~]#/usr/local/keepalived/sbin/keepalived --help
Keepalived v1.2.1 (07/04,2011)
Usage:
/usr/local/keepalived/sbin/keepalived
/usr/local/keepalived/sbin/keepalived -n
/usr/local/keepalived/sbin/keepalived -f keepalived.conf
/usr/local/keepalived/sbin/keepalived -d
/usr/local/keepalived/sbin/keepalived -h
/usr/local/keepalived/sbin/keepalived-v
。。。。。。。。
可见版本是1.2.1，显示也很正常
2.7创建配置文件
[root@mds-Master ~]# more/etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
wei.wang@99bill.com
}
notification_email_from wei.wang@99bill.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MySQL-HA
}
vrrp_instance VI_1 {
state Backup #两台配置此处均是Backup
interface eth0 #VIP绑定在那块网卡上
smtp_alert #开启邮件报警
virtual_router_id 51
priority 100 #优先级，另一台改为90
advert_int1 #发送广播信息的间隔时间，单位秒
preempt #抢占，只在优先级高的机器上设置即可，优先级低的机器不设置
authentication {
auth_typePASS
auth_pass1111
}
virtual_ipaddress {
192.168.6.252 #VIP
}
}
virtual_server 192.168.6.252 4321 {
delay_loop 2 #每个2秒检查一次real_server状态
lb_algo wrr #LVS算法
lb_kind DR #LVS模式
persistence_timeout 60 #会话保持时间
protocol TCP
real_server 192.168.6.243 4321 {
weight 3
notify_down"/etc/keepalived/shutdown_keepalived.sh" #检测到服务down后执行的脚本
TCP_CHECK {
connect_timeout 10 #连接超时时间
nb_get_retry 3 #重连次数
delay_before_retry #重连间隔时间
connect_port 4321 #健康检查端口
}
}
}
global_defs ：全局定义，
notification_email：指定Keepalived在发生事件（如：自动切换），需要发送Email到的对象，可以为多个地址
notification_email_from：邮件发送者
smtp_server ：发送邮件的邮件服务器，如果本地有开启sendmail的话，可以采用127.0.0.1
vrrp_instance VI_1 ：VRRP实例配置，包含了主从状态、VIP、权重等
virtual_server： 虚拟主机，包含了虚拟主机的IP+Port，实际主机的IP+Port，以及检查实际主机的IP+Port异常后的操作等
lb_algo：LVS中的负载均衡调度算法
lb_kind：LVS中的负载均衡转发规则，一般包括DR,NAT,TUN3种，DR是效率最好的一种规则，直接路由转发
[root@mds-Master ~]# /etc/init.d/sendmail status
sendmail (pid 31476) is running...
You have new mail in /var/spool/mail/root
[mysql@mds-Master tool]$ more/etc/keepalived/shutdown_keepalived.sh
#!/bin/sh
pkill keepalived
就是检查到MySQL宕机后，自动杀死Keepalived进程，那么另外一台机器上的Keepalived进程在接受广播信息超时后，自动接管VIP，进入到Master状态
上图是Keepalived自动发送的邮件，这个很好，可对Keepalived的状态变更自动监控
2.8启动Keepalived
[root@mds-Master ~]#/usr/local/keepalived/sbin/keepalived -D
默认情况下，Keepalived的配置文件是/etc/keepalived/keepalived.conf
查看日志文件，Keepalived默认的日志文件是/var/log/messages
[root@mds-Master ~]# tail -10 /var/log/messages
Jul 11 17:26:10 mds-Master Keepalived_vrrp:Registering Kernel netlink reflector
Jul 11 17:26:10 mds-Master Keepalived_vrrp:Registering Kernel netlink command channel
Jul 11 17:26:10 mds-Master Keepalived_vrrp:Registering gratutious ARP shared channel
Jul 11 17:26:10 mds-Master Keepalived_vrrp: Openingfile '/etc/keepalived/keepalived.conf'.
Jul 11 17:26:10 mds-Master Keepalived_vrrp:Configuration is using : 63222 Bytes
Jul 11 17:26:10 mds-Master Keepalived_vrrp: UsingLinkWatch kernel netlink reflector...
Jul 11 17:26:10 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Entering Backup STATE
Jul 11 17:26:10 mds-Master Keepalived_vrrp: VRRPsockpool: [ifindex(2), proto(112), fd(11,12)]
Jul 11 17:26:11 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) forcing a new Master election
Jul 11 17:26:12 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Transition to Master STATE
Jul 11 17:26:13 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Entering Master STATE
Jul 11 17:26:13 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) setting protocol VIPs.
Jul 11 17:26:13 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.6.252
至此，Keepalived的安装配置告一段落了。
2.9 Keepalived在RHEL 6.2中的特别之处
Keepalived在RHEL 6.2中，不会自动的加载ipvs模块，可以通过下面命令来确认是否已经加载：
lsmod|grep ip_vs
所以按照上述方式安装后，日志文件(默认是:/var/log/messages)中出现以下报警信息，“Keepalived_healthcheckers:IPVS: Can't initialize ipvs: Protocol not available”，ipvs称之为IP 虚拟服务器（IP Virtual Server），主要是运行在LVS下的提供负载平衡功能的一种技术，而实际上，我们使用的keepalived并没有使用负载均衡的功能，只是使用虚拟IP自动漂移的部分，所以呢，即便是没有找到，keepalived也是正常运转的，不影响正常使用。
这样，我们就需要手工加载ipvs模块，命令如下：
modprobeip_vs
modprobeip_vs_wrr
再重启keepalived即可，即下面的两条命令：
Sh/etc/keepalived/shutdown_keepalived.sh --关闭
/usr/local/keepalived/sbin/keepalived -D --启动
再次观察日志文件，可以看到，上述的报警信息就再也没有出现了。
2.Keepalived之模拟测试
3.1测试VIP是否可用
在启动192.168.6.243和192.168.6.244两台机器上的Keepalived后（正常与否，需要检查日志文件/var/log/messages）,，利用MySQL的客户端连接之，看是否可用登陆
下面我就在192.168.6.49这台机器上，远程登陆192.168.6.252:4321（虚拟IP+虚拟端口），看是否可以正常登陆之
[root@mrs_test ~]# hostname -i
192.168.6.49
[root@mrs_test ~]# mysql -h192.168.6.252 -P4321-uwangwei -ptianma
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 295
Server version: 5.1.47-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clearthe buffer.
mysql> status
--------------
mysql Ver14.14 Distrib 5.1.33, for pc-linux-gnu (i686) using readline 5.1
Connection id: 295
Current database:
Current user: wangwei@192.168.6.49
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.1.47-log Source distribution
Protocol version: 10
Connection: 192.168.6.252 via TCP/IP
Server characterset: utf8
Db characterset: utf8
Client characterset: latin1
Conn. characterset: latin1
TCP port: 4321
Uptime: 10 min 32 sec
Threads: 2 Questions: 10 Slow queries:0 Opens: 14 Flush tables: 1 Open tables: 8 Queries per second avg: 0.15
--------------
mysql>
可见一切才正常，可以正常登陆之
3.2模拟MySQL挂掉
下面我们模拟MySQL挂掉后，看VIP是否会自动地被另外一台机器接管。
3.2.1 查看192.168.6.243上的Keepalived日志
[root@mds-Master ~]# tail -10 /var/log/messages
Jul 12 10:26:24 mds-Master Keepalived_vrrp: RemoteSMTP server [127.0.0.1:25] connected.
Jul 12 10:26:24 mds-Master Keepalived_vrrp: SMTPalert successfully sent.
Jul 12 10:26:25 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) forcing a new Master election
Jul 12 10:26:26 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Transition to Master STATE
Jul 12 10:26:27 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Entering Master STATE
Jul 12 10:26:27 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) setting protocol VIPs.
Jul 12 10:26:27 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.6.252
Jul 12 10:26:27 mds-Master Keepalived_vrrp: RemoteSMTP server [127.0.0.1:25] connected.
Jul 12 10:26:27 mds-Master Keepalived_vrrp: SMTPalert successfully sent.
Jul 12 10:26:32 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.6.252
可见192.168.6.243上的Keepalived是Master状态
3.2.2 查看192.168.6.244上的Keepalived日志
[root@mds-slave ~]# tail -10 /var/log/messages
Jul 12 10:26:40 mds-slave avahi-daemon[4968]:Registering new address record for 192.168.6.252 on eth0.
Jul 12 10:26:40 mds-slave avahi-daemon[4968]:Registering new address record for 192.168.6.244 on eth0.
Jul 12 10:26:40 mds-slave avahi-daemon[4968]:Registering HINFO record with values 'X86_64'/'LINUX'.
Jul 12 10:26:56 mds-slave Keepalived_vrrp:VRRP_Instance(VI_1) Received higher prio advert
Jul 12 10:26:56 mds-slave Keepalived_vrrp:VRRP_Instance(VI_1) Entering Backup STATE
Jul 12 10:26:56 mds-slave Keepalived_vrrp:VRRP_Instance(VI_1) removing protocol VIPs.
Jul 12 10:26:56 mds-slave Keepalived_vrrp: Netlinkreflector reports IP 192.168.6.244 removed
Jul 12 10:26:56 mds-slave Keepalived_healthcheckers:Netlink reflector reports IP 192.168.6.244 removed
Jul 12 10:26:56 mds-slave avahi-daemon[4968]:Server startup complete. Host name is mds-slave-51.local. Local service cookieis 479334863.
Jul 12 10:26:56 mds-slave avahi-daemon[4968]:Withdrawing address record for 192.168.6.252 on eth0.
可见192.168.6.243上的Keepalived处于Slave状态
3.2.3 关闭掉192.168.6.243上的MySQL
[mysql@mds-Master mysql]$ mysqladmin--defaults-file=my1.cnf -uroot -p99billshutdown
110712 10:50:16 mysqld_safe mysqld from pid file/home/mysql/mysql/mysql/mysqld.pid ended
[1]+ Done /usr/local/mysql/bin/mysqld_safe --defaults-file=my1.cnf
3.2.4 查看192.168.6.243上的Keepalived日志
[root@mds-Master ~]# tail -10 /var/log/messages
Jul 12 10:26:32 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.6.252
Jul 12 10:50:09 mds-MasterKeepalived_healthcheckers: TCP connection to [192.168.6.243:4321] failed !!!
Jul 12 10:50:09 mds-MasterKeepalived_healthcheckers: Removing service [192.168.6.243:4321] from VS[192.168.6.252:4321]
Jul 12 10:50:09 mds-MasterKeepalived_healthcheckers: Executing [/etc/keepalived/shutdown_keepalived.sh]for service [192.168.6.243:4321] in VS [192.168.6.252:4321]
Jul 12 10:50:09 mds-MasterKeepalived_healthcheckers: Lost quorum 1-0=1 > 0 for VS [192.168.6.252:4321]
Jul 12 10:50:09 mds-MasterKeepalived_healthcheckers: Remote SMTP server [127.0.0.1:25] connected.
Jul 12 10:50:09 mds-Master Keepalived: Terminatingon signal
Jul 12 10:50:09 mds-Master Keepalived_vrrp:Terminating VRRP child process on signal
Jul 12 10:50:09 mds-Master Keepalived: StoppingKeepalived v1.2.1 (07/04,2011)
Jul 12 10:50:09 mds-MasterKeepalived_healthcheckers: Terminating Healthchecker child process on signal
可见192.168.6.243上的Keepalived对实际服务器进行了健康检查，失败之，触发脚本/etc/keepalived/shutdown_keepalived.sh的执行，发送报警邮件
3.2.5 查看192.168.6.243上的Keepalived进程
[root@mds-Master ~]# ps aux |grep keep
root 20370 0.0 0.0 61188 768 pts/4 S+ 10:54 0:00 grep keep
Keepalived进程已经不存在
3.2.6 查看192.168.6.244上的Keepalived日志
[root@mds-slave ~]# tail -10 /var/log/messages
Jul 12 10:52:38 mds-slave avahi-daemon[4968]:Registering new address record for 192.168.6.252 on eth0.
Jul 12 10:52:38 mds-slave avahi-daemon[4968]:Registering new address record for 192.168.6.244 on eth0.
Jul 12 10:52:38 mds-slave avahi-daemon[4968]:Registering HINFO record with values 'X86_64'/'LINUX'.
Jul 12 10:52:58 mds-slave avahi-daemon[4968]:Withdrawing address record for fe80::baac:6fff:fe15:bf64 on eth0.
Jul 12 10:52:58 mds-slave avahi-daemon[4968]:Withdrawing address record for 192.168.6.244 on eth0.
Jul 12 10:52:58 mds-slave avahi-daemon[4968]:Registering new address record for fe80::baac:6fff:fe15:bf64 on eth0.
Jul 12 10:52:58 mds-slave avahi-daemon[4968]:Registering new address record for 192.168.6.252 on eth0.
Jul 12 10:52:58 mds-slave avahi-daemon[4968]:Registering new address record for 192.168.6.244 on eth0.
Jul 12 10:52:58 mds-slave avahi-daemon[4968]:Registering HINFO record with values 'X86_64'/'LINUX'.
可见192.168.6.243自动接管了192.168.6.252的管理
3.2.7 测试VIP是否可用
[root@mrs_test ~]# hostname -i
192.168.6.49
[root@mrs_test ~]# mysql -h192.168.6.252 -P4321-uwangwei -ptianma
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 293927
Server version: 5.1.47-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clearthe buffer.
mysql> status
--------------
mysql Ver14.14 Distrib 5.1.33, for pc-linux-gnu (i686) using readline 5.1
Connection id: 293927
Current database:
Current user: wangwei@192.168.6.49
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.1.47-log Source distribution
Protocol version: 10
Connection: 192.168.6.252 via TCP/IP
Server characterset: utf8
Db characterset: utf8
Client characterset: latin1
Conn. characterset: latin1
TCP port: 4321
Uptime: 6 days 19 hours 13 min 2 sec
Threads: 2 Questions: 1645 Slow queries:0 Opens: 175 Flush tables: 1 Open tables: 62 Queries per second avg: 0.2
--------------
mysql>
可见VIP+虚拟Port依然可以正常访问，这时候实际服务器是MySQL-192.168.6.243
3.2.8 启动192.168.6.243上的MySQL
[mysql@mds-Master mysql]$ /usr/local/mysql/bin/mysqld_safe --defaults-file=my1.cnf &
[1] 20374
[mysql@mds-Master mysql]$ 110712 10:55:06mysqld_safe Logging to '/home/mysql/mysql/mysql/mysqld.log'.
110712 10:55:06 mysqld_safe Starting mysqld daemonwith databases from /home/mysql/mysql/mysql
3.2.9 启动192.168.6.243上的Keepalived
[root@mds-Master ~]#/usr/local/keepalived/sbin/keepalived -D
3.2.10 查看192.168.6.243上的Keepalived日志
[root@mds-Master ~]# tail -10 /var/log/messages
Jul 12 10:55:47 mds-Master Keepalived_vrrp: RemoteSMTP server [127.0.0.1:25] connected.
Jul 12 10:55:48 mds-Master Keepalived_vrrp: SMTPalert successfully sent.
Jul 12 10:55:48 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) forcing a new Master election
Jul 12 10:55:49 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Transition to Master STATE
Jul 12 10:55:50 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Entering Master STATE
Jul 12 10:55:50 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) setting protocol VIPs.
Jul 12 10:55:50 mds-Master Keepalived_vrrp:VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.6.252
Jul 12 10:55:50 mds-Master Keepalived_vrrp: RemoteSMTP server [127.0.0.1:25] connected.
Jul 12 10:55:50 mds-Master Keepalived_vrrp: SMTPalert successfully sent.
Jul 12 10:55:55 mds-Master Keepalived_vrrp: VRRP_Instance(VI_1)Sending gratuitous ARPs on eth0 for 192.168.6.252
可见192.168.6.243重新进入Master状态，这里需要注意的是：配置文件中我配置的是抢占式，如果是不抢占的话，192.168.6.243重启后会进入Slave状态，不会发生Master的抢占。
! Configuration File for keepalived
global_defs {
notification_email {
haiying.sun@99bill.com
qian.pan@99bill.com
13918456836@139.com
}
notification_email_from mysql@account.99bill.com
smtp_server 172.16.80.103
smtp_connect_timeout 30
router_id MySQL-MDS-HA
}
vrrp_instance VI_2 {
state Backup
interface bond0
smtp_alert
virtual_router_id 61
priority 80
advert_int 1
# preempt
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.6.231 #VIP
}
}
virtual_server 192.168.6.231 3306 {
delay_loop 2
lb_algo wrr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.6.203 3306 {
weight 3
notify_down "/etc/keepalived/shutdown_keepalived.sh"
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry
connect_port 3306
}
}
}
###################################################################
os 6.2 以上有个模块自动加载
lsmod|grep ip_vs
modprobe ip_vs
modprobe ip_vs_wrr
###################################################################
sh /etc/keepalived/shutdown_keepalived.sh
1、 启动keepalived
/usr/local/keepalived/sbin/keepalived -D
改变日志目录
/usr/local/keepalived/sbin/keepalived -d -D -S 0
修改文件vi /etc/rsyslog.conf（RHEL 6.2中rsyslog服务对应的配置文件为/etc/rsyslog.conf），添加一行，添加最后的结果如下：
# Save boot messages also to boot.log
local7.* /var/log/boot.log
# keepalived -S 0
local0.* /var/log/keepalived.log
其中/var/log/keepalived.log这个文件就是我们自定义的文件。
再重启一下syslog服务（在RHEL 6.2中，syslog的服务名已经名为rsyslog）
/etc/init.d/rsyslog restart3.2.11 查看192.168.6.244上的Keepalived日志
[root@mds-slave ~]# tail -10 /var/log/messages
Jul 12 10:56:18 mds-slave avahi-daemon[4968]:Registering new address record for 192.168.6.252 on eth0.
Jul 12 10:56:18 mds-slave avahi-daemon[4968]:Registering new address record for 192.168.6.244 on eth0.
Jul 12 10:56:18 mds-slave avahi-daemon[4968]: RegisteringHINFO record with values 'X86_64'/'LINUX'.
Jul 12 10:56:19 mds-slave Keepalived_vrrp:VRRP_Instance(VI_1) Received higher prio advert
Jul 12 10:56:19 mds-slave Keepalived_vrrp:VRRP_Instance(VI_1) Entering Backup STATE
Jul 12 10:56:19 mds-slave Keepalived_vrrp:VRRP_Instance(VI_1) removing protocol VIPs.
Jul 12 10:56:19 mds-slave Keepalived_vrrp: Netlinkreflector reports IP 192.168.6.244 removed
Jul 12 10:56:19 mds-slave avahi-daemon[4968]:Withdrawing address record for 192.168.6.252 on eth0.
Jul 12 10:56:19 mds-slaveKeepalived_healthcheckers: Netlink reflector reports IP 192.168.6.244 removed
Jul 12 10:56:20 mds-slave avahi-daemon[4968]:Server startup complete. Host name is mds-slave-81.local. Local service cookieis 479334863.
可见192.168.6.243自动的进入Slave状态
3.3模拟Keepalvied挂掉
其实3.2中已经包含了3.3（模拟Keepalived挂掉）这种的场景，这里就不再叙述，详见3.2
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