tomcat + keepalived 实现主备高可用
tomacat7+ keepalived 高可用集群配置服务器环境规划
node1： 10.10.3.16 app01
node2： 10.10.3.17 app02
vip：
软件环境规划
操作系统：oracle linux6.84.1.12-37.4.1.el6uek.x86_64
keepalived：keepalived-1.3.5
Java：jdk-1.7.0_80
Tomcat：apache-tomcat-7.0.81
配置要求：
tomcat主从，只有一台机器提供服务，另一台standby
安装keepalived（两台机器都需要安装）
1、准备：
yum install openssl-devel libnl3-devel ipset-devel iptables-devel libnfnetlink-devel
wget http://www.keepalived.org/software/keepalived-1.3.5.tar.gz
2、安装
tar zxf keepalived-1.3.5.tar.gz
cd keepalived-1.3.5
./configure --prefix=/usr/local/keepalived --with-init=SYSV--不指定的话，默认不生成RECL6的启动脚本
make && make install
3、准备脚本配置文件:
# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
# cp -p /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
# mkdir /etc/keepalived
# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
# chkconfig --add keepalived
# chkconfig --list keepalived
# chkconfigkeepalived on
# chmod +x /etc/init.d/keepalived
****以上部分，在两台机器上的操作完全相同
4、调整keepalived配置文件
node1
# vim /etc/keepalived/keepalived.conf
global_defs {
notification_email {
root@localhost
}
notification_email_from root@localhost
smtp_server 127.0.0.1
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_http_port {
script "/opt/tomcat.pid"
interval 1
weight -2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_interface {
eth0
}
track_script {
chk_httpp_port
}
virtual_ipaddress {
10.10.3.200
}
}
node2
# vim /etc/keepalived/keepalived.conf
global_defs {
notification_email {
root@localhost
}
notification_email_from root@localhost
smtp_server 127.0.0.1
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_http_port {
script "/opt/tomcat.pid"
interval 1
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99 #此处不同,要低于master
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_interface {
eth0
}
track_script {
chk_httpp_port
}
virtual_ipaddress {
10.10.3.200
}
}
5、在两台机器上编辑监控脚本
# vim /opt/tomcat.pid
#!/bin/bash
# keepalived for tomcat
# edited by sky: 2017-09-12
PS_NUM=`ps -C java --no-headers |wc -l`
if [ $PS_NUM -eq 0 ]; then
/etc/init.d/keepalived stop
fi
6、在两台机器上编写tomcat启动脚本（相同）
vim /etc/init.d/tomcat
#!/bin/bash
#chkconfig: 2345 10 90
#description: Starts and Stops the tomcatdaemon
#edited by sky: 2017-09-12
CATALINA_HOME=/app/tomcat
JAVA_HOME=/usr/local/jdk1.7.0_80
export CATALINA_HOMEJAVA_HOME
start_tomcat=$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_NUM=`ps -C java --no-headers | wc -l`
if [ $PS_NUM -gt 0 ]
then
echo-e "tomcat ( pid = `ps -C java --no-headers |awk '{print $1}'`) is running...\n"
else
echo "tomcat is stopped"
fi
}
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
stop
sleep 1
start
;;
status)
status
;;
*)
echo "Usage:$0 {start|stop|restart|status}"
exit 1
esac
exit 0
# shell end.
7、在两台机器上分别启动tomcat和keepalived
service tomcat start
service keepalived start
测试：
可关闭master上的tomcat， 则可以看到vip会漂移到backup服务器， 启动master的tomcat服务器，然后再重启keepalived，则vip会自动漂移到master
8、检查日志：
tail -f /var/log/messages
9、检查vip是否在主服务器上
ifconfig
10、vip切换及恢复原则：
1、切换：master服务器的tomcat服务停止，则master上的keepalived会自动停止， vip漂移到backup服务器
2、恢复： master服务器修复完毕后， 请分别启动tomcat和keepalived，则vip会自动漂移到master服务器
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