keepalived配置tomcat主备
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准备工作
虚拟机vmware workstations
安装ubuntu系统15.04 64位系统
配置主节点
安装keepalived,ubuntu下安装和其他系统下安装还是有很有区别的!!!
下载http://www.keepalived.org/software/keepalived-1.2.22.tar.gz
cmd下指令
如果已经是超级管理员 可以不用加sudo切换
$ sudo apt-get install libpopt-dev
$ sudo apt-get install daemon
$ sudo tar zxfv keepalived-1.2.22.tar.gz
$ cd keepalived-1.2.22
$ ./configure --prefix=/usr/local/keepalived
$ make
$ sudo make install
$ sudo mkdir /etc/sysconfig
$ sudo cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
$ sudo cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
$ sudo cp /usr/local/keepalived/sbin/keepalived /sbin/
$ sudo mkdir /etc/keepalived
$ sudo cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
$ sudo vi /etc/keepalived/keepalived.conf
内容如下
! Configuration File for keepalivedglobal_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id LVS_DEVEL vrrp_skip_check_adv_addr vrrp_strict vrrp_garp_interval 0 vrrp_gna_interval 0}vrrp_script chk_tomcat{ script "/home/wm5920/keepalived-1.2.22/scripts/tomcat_check.sh" interval 2 timeout 2 fall 3}vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.186.251 } track_script { chk_tomcat }}
其中
chk_tomcat为检验tomcat存活脚本,内容如下
#!/bin/bash netstat -ant|grep 8080ALIVE=$?LOGFILE="/home/wm5920/keepalived-1.2.22/scripts/keepalived-check.log" echo "[CHECK]" >> $LOGFILEdate >> $LOGFILEif [ $ALIVE -eq 0 ]; then : echo "8080 is ok" >> $LOGFILE 2>&1 exit 0 else echo "8080 is down" >> $LOGFILE 2>&1 exit 1 fi
$?为上一个命令的结果
virtual_ipaddress为配置的虚拟ip(同一个网段的)
:wq (保存并退出)
$ sudo mkdir /var/lock/subsys (注:这个目录重启服务器后会消失,需要将其写道开机启动项中,如写到/etc/rc.local里)
$ service keepalived start
开机自启动
$ sudo vi /etc/rc.local
按a或i进入编辑模式
mkdir /var/lock/subsys
service keepalived start
按Esc键退出编辑模式
:wq (保存并退出)
$ sudo ip a (可以看到eth0多了个192.168.186.251的ip)
BACKUP服务器步骤同上,只需将/etc/keepalived/keepalived.conf里的MASTER改为BACKUP,priority改为50即可
BACKUP服务器ip a显示eth0没有多出192.168.186.251这个ip,等MASTER服务器宕后就会显示出来,当MASTER服务器正常后会自动消失
安装tomcat,在webapp下放ROOT文件夹,里面放index.html,内容为
欢迎 8080
配置备节点
克隆第一个虚拟机
完成后将keepalived.conf里的MASTER改为BACKUP即可,同时将index.html内容改成“”欢迎 backup 8080“”
测试结果
service keepalived start
./startup.sh
启动两个节点的keepalived和tomcat
在浏览器中输入
http://192.168.186.251:8080/
查看页面打印,出现
欢迎 8080
关闭主节点下tomcat
再次请求,出现
欢迎 backup 8080
再次启动主节点tomcat
又回到 欢迎 8080
cmd下也可以通过ip a观察虚拟ip飘来飘去。。。。。
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