keepalived实现Tomcat服务双机热备

1. 规划

1.1服务器环境规划

负载服务器master及WEB服务器1真实IP：10.10.195.53

负载服务器backup及WEB服务器2真实IP：10.10.195.190

负载服务器虚拟ip：10.10.195.212

1.2 软件环境规划

操作系统：Red Hat Enterprise Linux Server release 5.6 (Tikanga)

keepalived：keepalived-1.2.19

Java：jdk-1.7.0_79

Tomcat：apache-tomcat-7.0.64

2. 负载服务器配置

这里只叙述如何安装配置keepalived，至于java以及tomcat的安装及配置，这里不赘述。

2.1 安装keepalived

[~]tar -zxvf keepalived-1.2.19.tar.gz  
[~] cd keepalived-1.2.19  
[keepalived-1.2.19] ./configure --prefix=/usr/local/keepalived --disable-fwmark  
#(如果直接输入./configure有可能报错：configure:error: No SO_MARK declaration in headers)  
[keepalived-1.2.19] make  
[keepalived-1.2.19] make install

2.2 配置keepalived服务

[keepalived-1.2.19] cp /usr/local/keepalived/sbin/keepalived /usr/sbin/  
[keepalived-1.2.19] cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/  
[keepalived-1.2.19] cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/  
[keepalived-1.2.19] mkdir /etc/keepalived  
[keepalived-1.2.19] cp /usr/local/keepalived/etc/keepalived/keepalived.conf/etc/keepalived/  
[keepalived-1.2.19] chkconfig --add keepalived  
[keepalived-1.2.19] chkconfig keepalived on

重启/启动/关闭/查看状态keepalived

service keepalived restart

service keepalived start

service keepalived stop

service keepalived status

2.3 配置keepalived.conf文件

[~]mv /etc/keepalived/keepalived.conf/etc/keepalived/keepalived.conf.bak  
[~]vi /etc/keepalived//keepalived.conf

主备机的keepalived.conf文件大致相同，只是注意红色标注的地方。

主机配置：

global_defs {  
   router_id NodeA  
}  
vrrp_script chk_http_port {  
   script "/opt/tomcat.pid"  
   interval 5  
   weight 2  
}  
vrrp_instance VI_1 {  
   state MASTER  
   interface eth0  
   virtual_router_id 52  
   priority 150  
   advert_int 1  

   authentication {  
       auth_type PASS  
       auth_pass 1111  
    }  

   track_script {  
       chk_http_port  
    }  

   virtual_ipaddress {  
       10.10.195.212  
    }  
}

备机配置：

global_defs {  
   router_id NodeB  
}  
vrrp_script chk_http_port {  
   script "/opt/tomcat.pid"  
   interval 5  
   weight 2  
}  
vrrp_instance VI_1 {  
   state BACKUP  
   interface eth0  
   virtual_router_id 52  
   priority 100  
   advert_int 1  

   authentication {  
       auth_type PASS  
       auth_pass 1111  
    }  

   track_script {  
       chk_http_port  
    }  

   virtual_ipaddress {  
       10.10.195.212  
    }  
}

2.4配置/opt/tomcat.pid

#!/bin/bash  
#description: check tomcat service anddecide whether stop the keepalived or not  
#edited by zzh: 2015-10-14  

CATALINA_HOME=/users/shr/apache-tomcat-7.0.64  
JAVA_HOME=/users/shr/util/JavaDir/jdk  
export CATALINA_HOME  
export JAVA_HOME  

ps ax --width=1000 | grep"org.apache.catalina.startup.Bootstrap start" | grep -v"grep" | awk '{printf $1 " "}' | wc | awk '{print $2}' >tomcat_process_count.txt  
read line < tomcat_process_count.txt  

start_tomcat=$CATALINA_HOME/bin/startup.sh  

if [ ${line} -lt 1 ]  
then  
       echo -n "===Starting tomcat===:"  
       ${start_tomcat}  
       # :sudo service tomcat start  
       echo "===tomcat start ok.==="  
       sleep 3  

       # check the tomcat status.  
       ps ax --width=1000 | grep "org.apache.catalina.startup.Bootstrapstart" | grep -v "grep" | awk '{printf $1 " "}' | wc |awk '{print $2}' > tomcat_process_count.txt  
       read line2 < tomcat_process_count.txt  
       if [ ${line2} -lt 1 ]  
       then  
                sudo service keepalived stop  
       fi  
fi  
rm tomcat_process_count.txt  
#shell end.

3. 日志查看

3.1 正常启动

输入tail -f /var/log/messages查看启动keepalived日志：

（MASTER：10.10.195.53）

Sep 29 15:49:16 shr Keepalived[5536]:Starting Keepalived v1.2.19 (09/21,2015)  
Sep 29 15:49:16 shrKeepalived_healthcheckers[5538]: Netlink reflector reports IP 10.10.195.53added  
Sep 29 15:49:16 shrKeepalived_healthcheckers[5538]: Netlink reflector reports IP 10.10.195.53added  
Sep 29 15:49:16 shrKeepalived_healthcheckers[5538]: Registering Kernel netlink reflector  
Sep 29 15:49:16 shrKeepalived_healthcheckers[5538]: Registering Kernel netlink command channel  
Sep 29 15:49:16 shrKeepalived_healthcheckers[5538]: Opening file'/etc/keepalived/keepalived.conf'.  
Sep 29 15:49:16 shrKeepalived_healthcheckers[5538]: Configuration is using : 6572 Bytes  
Sep 29 15:49:16 shr Keepalived[5537]:Starting Healthcheck child process, pid=5538  
Sep 29 15:49:16 shr Keepalived_healthcheckers[5538]:Using LinkWatch kernel netlink reflector...  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:Netlink reflector reports IP 10.10.195.53 added  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:Netlink reflector reports IP 10.10.195.53 added  
Sep 29 15:49:16 shr Keepalived[5537]:Starting VRRP child process, pid=5539  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:Registering Kernel netlink reflector  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:Registering Kernel netlink command channel  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:Registering gratuitous ARP shared channel  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:Opening file '/etc/keepalived/keepalived.conf'.  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:Configuration is using : 36541 Bytes  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:Using LinkWatch kernel netlink reflector...  
Sep 29 15:49:16 shr Keepalived_vrrp[5539]:VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]  
Sep 29 15:49:17 shr Keepalived_vrrp[5539]:VRRP_Instance(VI_1) Transition to MASTER STATE  
Sep 29 15:49:17 shr Keepalived_vrrp[5539]:VRRP_Instance(VI_1) Received lower prio advert, forcing new election  
Sep 29 15:49:18 shr Keepalived_vrrp[5539]:VRRP_Instance(VI_1) Entering MASTER STATE  
Sep 29 15:49:18 shr Keepalived_vrrp[5539]:VRRP_Instance(VI_1) setting protocol VIPs.  
Sep 29 15:49:18 shr Keepalived_vrrp[5539]:VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.10.195.212  
Sep 29 15:49:18 shr Keepalived_vrrp[5539]:Netlink reflector reports IP 10.10.195.212 added  
Sep 29 15:49:18 shrKeepalived_healthcheckers[5538]: Netlink reflector reports IP 10.10.195.212added  
Sep 29 15:49:23 shr Keepalived_vrrp[5539]:VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 10.10.195.212

(BACKUP:10.10.195.190)

Sep 29 15:46:25 server1 Keepalived[18218]:Starting Keepalived v1.2.19 (09/25,2015)  
Sep 29 15:46:25 server1Keepalived_healthcheckers[18220]: Netlink reflector reports IP 10.10.195.190added  
Sep 29 15:46:25 server1Keepalived_healthcheckers[18220]: Netlink reflector reports IP 10.10.195.190added  
Sep 29 15:46:25 server1Keepalived_healthcheckers[18220]: Registering Kernel netlink reflector  
Sep 29 15:46:25 server1Keepalived_healthcheckers[18220]: Registering Kernel netlink command channel  
Sep 29 15:46:25 server1 Keepalived_healthcheckers[18220]:Opening file '/etc/keepalived/keepalived.conf'.  
Sep 29 15:46:25 server1Keepalived_healthcheckers[18220]: Configuration is using : 6682 Bytes  
Sep 29 15:46:25 server1 Keepalived[18219]:Starting Healthcheck child process, pid=18220  
Sep 29 15:46:25 server1 Keepalived[18219]:Starting VRRP child process, pid=18221  
Sep 29 15:46:25 server1Keepalived_vrrp[18221]: Netlink reflector reports IP 10.10.195.190 added  
Sep 29 15:46:25 server1Keepalived_vrrp[18221]: Netlink reflector reports IP 10.10.195.190 added  
Sep 29 15:46:25 server1Keepalived_healthcheckers[18220]: Using LinkWatch kernel netlink reflector...  
Sep 29 15:46:25 server1Keepalived_vrrp[18221]: Registering Kernel netlink reflector  
Sep 29 15:46:25 server1Keepalived_vrrp[18221]: Registering Kernel netlink command channel  
Sep 29 15:46:25 server1Keepalived_vrrp[18221]: Registering gratuitous ARP shared channel  
Sep 29 15:46:25 server1Keepalived_vrrp[18221]: Opening file '/etc/keepalived/keepalived.conf'.  
Sep 29 15:46:25 server1 Keepalived_vrrp[18221]:Configuration is using : 36651 Bytes  
Sep 29 15:46:25 server1Keepalived_vrrp[18221]: Using LinkWatch kernel netlink reflector...  
Sep 29 15:46:25 server1Keepalived_vrrp[18221]: VRRP_Instance(VI_1) Entering BACKUP STATE  
Sep 29 15:46:25 server1 Keepalived_vrrp[18221]:VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]

3.2 主备切换

l  当在主机（MASTER：10.10.195.53）中输入 sudoservice keepalived stop，此时就会进行主备切换，主机切换成备机。

主机（MASTER：10.10.195.53）输出如下

Oct 14 13:25:09 shr Keepalived_vrrp[26683]:VRRP_Instance(VI_1) sending 0 priority  
Oct 14 13:25:09 shr Keepalived_vrrp[26683]:VRRP_Instance(VI_1) removing protocol VIPs.  
Oct 14 13:25:09 shrKeepalived_healthcheckers[26682]: Netlink reflector reports IP 10.10.195.212removed  
Oct 14 13:25:09 shr Keepalived[26681]:Stopping Keepalived v1.2.19 (09/21,2015)

备机(BACKUP:10.10.195.190)输出如下

Oct 14 13:19:58 server1Keepalived_vrrp[30890]: VRRP_Instance(VI_1) Transition to MASTER STATE  
Oct 14 13:19:59 server1Keepalived_vrrp[30890]: VRRP_Instance(VI_1) Entering MASTER STATE  
Oct 14 13:19:59 server1Keepalived_vrrp[30890]: VRRP_Instance(VI_1) setting protocol VIPs.  
Oct 14 13:19:59 server1Keepalived_vrrp[30890]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for10.10.195.212  
Oct 14 13:19:59 server1 Keepalived_healthcheckers[30889]:Netlink reflector reports IP 10.10.195.212 added  
Oct 14 13:19:59 server1Keepalived_vrrp[30890]: Netlink reflector reports IP 10.10.195.212 added  
Oct 14 13:20:04 server1Keepalived_vrrp[30890]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for10.10.195.212

l  当在主机（MASTER：10.10.195.53）中输入sudoservice keepalived start,此时就会切换成主机。备机(BACKUP:10.10.195.190)输出如下信息：

Oct 14 13:25:11 server1Keepalived_vrrp[30890]: VRRP_Instance(VI_1) Received higher prio advert  
Oct 14 13:25:11 server1Keepalived_vrrp[30890]: VRRP_Instance(VI_1) Entering BACKUP STATE  
Oct 14 13:25:11 server1Keepalived_vrrp[30890]: VRRP_Instance(VI_1) removing protocol VIPs.  
Oct 14 13:25:11 server1Keepalived_healthcheckers[30889]: Netlink reflector reports IP 10.10.195.212removed  
Oct 14 13:25:11 server1Keepalived_vrrp[30890]: Netlink reflector reports IP 10.10.195.212 removed

4. 查看虚拟ip

可以通过ip add show命令查看添加的虚拟ip：

[shr@shr bin]$ip add show  
1: lo: <LOOPBACK,UP,LOWER_UP> mtu16436 qdisc noqueue  
   link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00  
   inet 127.0.0.1/8 scope host lo  
2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000  
   link/ether 00:0c:29:6b:f2:a8 brd ff:ff:ff:ff:ff:ff  
   inet 10.10.195.53/24 brd 10.10.195.255 scope global eth0  
   inet 10.10.195.212/32scope global eth0

5. 常见错误

5. 1常见错误一：

/var/log/messages has thousands of errorslike this:  

Jun 28 09:18:32 rust Keepalived_vrrp:receive an invalid ip number count  
associated with VRID!  
Jun 28 09:18:32 rust Keepalived_vrrp: bogusVRRP packet received on eth0 !!!  
Jun 28 09:18:32 rust Keepalived_vrrp:VRRP_Instance(VI_1) Dropping received  
VRRP packet...  

The backup director starts up, but doesn'tlisten on the virtual addresses  
at all. Its /var/log/messages has thousands of errors like this:  

Jun 28 06:25:05 stye Keepalived_vrrp:receive an invalid ip number count  
associated with VRID!  
Jun 28 06:25:05 stye Keepalived_vrrp: bogusVRRP packet received on eth0 !!!  
Jun 28 06:25:05 stye Keepalived_vrrp:VRRP_Instance(VI_1) ignoring received  
advertisment...

解决方法：

改变配置文件/etc/keepalived/keepalived.conf中virtual_router_id为另一个值即可。

（changed the vrid to another number and it worked fine）.

5.2 常见错误二：

主机执行到VRRP_Instance(VI_1) Entering BACKUP STATE之后没有执行VRRP_Instance(VI_1)setting protocol VIPs。

解决方法：

可能是配置文件keepalived.conf中{左边没有空格。

附

linux添加tomcat服务

在/etc/init.d中输入 sudo vim tomcat

脚本具体内容如下：

#!/bin/bash  
#chkconfig: 2345 10 90  
#description: Starts and Stops the tomcatdaemon  
#edited by ZZH: 2015-10-14  

CATALINA_HOME=/users/shr/apache-tomcat-7.0.64  
JAVA_HOME=/users/shr/util/JavaDir/jdk  
export CATALINA_HOME  
export JAVA_HOME  

start_tomcat=$CATALINA_HOME/bin/startup.sh  
stop_tomcat=$CATALINA_HOME/bin/shutdown.sh  

if [ ! -f $CATALINA_HOME/bin/catalina.sh ]  
then  
         echo"===Tomcat is not available.==="  
         exit  
fi  

start()  
{  
         echo-n "===Starting tomcat===:"  
         ${start_tomcat}  
         echo"===tomcat start ok.==="  
}  

stop()  
{  
         echo-n "===Shutting down tomcat===:"  
         ${stop_tomcat}  
         echo"===tomcat stop ok.==="  
}  

status()  
{  
         ps ax --width=1000 | grep"org.apache.catalina.startup.Bootstrap start" | grep -v"grep" | awk '{printf $1 " "}' | wc | awk '{print $2}'> tomcat_process_count.txt  
         readline < tomcat_process_count.txt  
         rmtomcat_process_count.txt  
         if[ $line -gt 0 ]  
                   then  
                            echo-n "tomcat ( pid = "  
                            ps ax --width=1000 | grep"org.apache.catalina.startup.Bootstrap start" | grep -v"grep" | awk '{printf $1 " "}' | awk '{print $1}'> tomcat_process_pid.txt  
                            readpid < tomcat_process_pid.txt  
                            rmtomcat_process_pid.txt  
                            echo-n $pid  
                            echo-n ") is running..."  
                            echo  
                   else  
                            echo"tomcat is stopped"  
         fi  
}  

case "$1" in  
         start)  
                   start  
                   ;;  
         stop)  
                   stop  
                   ;;  
         restart)  
                   stop  
                   sleep1  
                   start  
                   ;;  
         status)  
                   status  
                   ;;  
         *)  
                   echo"Usage:$0 {start|stop|restart}"  
                   exit1  
esac  

exit 0  
# shell end.

在终端输入:

sudo chmod 755 tomcat  
sudo chkconfig --add tomcat

tomcat 启动 service tomcatstart

tomcat 关闭 service tomcatstop

tomcat 重启 service tomcatrestart

tomcat状态查看 service tomcatstatus