Apache+Tomcat+keepalived的负载均衡session复制及HA

marty001

1 Apache负载均衡
0、关闭防火墙（service iptables stop; chkconfig --level 35 iptables off），
   关闭selinux vi /etc/selinux/config   SELINUX=disabled
setenforce 0 生效
 
1、将mod_jk-1.2.31-httpd-2.2.x.so上传至/etc/httpd/modules目录下
 
 
2、
vi /etc/httpd/conf/httpd.conf
在Include conf.d/*.conf下
增加
Include /etc/httpd/conf/mod_jk.conf
 
配置
ServerName=192.168.1.X:80
 
3、
vi /etc/httpd/conf/mod_jk.conf
增加
 
LoadModule jk_module /etc/httpd/modules/mod_jk.so
 
JkWorkersFile /etc/httpd/conf/workers.properties
 
JkLogFile /etc/httpd/logs/mod_jk.log
 
JkLogLevel warn
 
JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"
 
JkMount /*.* controller 
 
4、
vi /etc/httpd/conf/workers.properties
增加
 
 
worker.list=controller
 
worker.tomcat1.port=8009
worker.tomcat1.host=192.168.1.152
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor=1 

worker.tomcat2.port=8009 
worker.tomcat2.host=192.168.1.155
worker.tomcat2.type=ajp13
worker.tomcat2.lbfactor=1 
 
worker.tomcat3.port=8009 
worker.tomcat3.host=192.168.1.156
worker.tomcat3.type=ajp13
worker.tomcat3.lbfactor=1 
 
worker.controller.type=lb 
worker.retries=3
worker.controller.balance_workers=tomcat1,tomcat2,tomcat3
 
worker.controller.sticky_session=false
2 Tomcat session复制
1、对于每一个server.xml
  <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">
 
2、在Engine标签内增加
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
 
 
3、在程序的web.xml的web-app结束前增加 <distributable/>
 
4、session复制需用组播，添加static route
vi /etc/sysconfig/network-scripts/route-eth0
增加
192.0.2.0/24 dev eth0 scope host
default via 192.0.2.1
192.168.2.0/24 via 192.168.13.1 dev eth0

service network restart
 
reboot 有效
 
3 HA（高可用性）keepalived配置
1、apache安装在105和106上
 
2、两台apache配置保持一致，除了httpd.conf的SERVERNAME配置的ip地址
 
3、两台机器分别安装keepalived
yum -y install keepalived
 
4、配置keepalived（105）
vi /etc/keepalived/keepalived.conf
========================================================
! Configuration File for keepalived
 
global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from admin@wisely.com
   smtp_server 192.168.1.0
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
 
vrrp_script chk_httpd {
    script "killall -0 httpd"
    interval 1
    weight -2
}
 
vrrp_instance httpd_1 {
    state MASTER
    interface eth0
    virtual_router_id 58
    priority 100           #priority 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1058
    }
    virtual_ipaddress {
    192.168.1.101           #vip
    }
    track_script {
    chk_httpd
    }
}
=========================================================
service keepalived start  #启动keepalived服务
chkconfig keepalived on
 
5、配置keepalived（106）
vi /etc/keepalived/keepalived.conf
=========================================================
! Configuration File for keepalived
 
global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from admin@wisely.com
   smtp_server 192.168.1.0
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
 
vrrp_script chk_httpd {
    script "killall -0 httpd"
    interval 1
    weight -2
}
 
vrrp_instance httpd_1 {
    state BACKUP
    interface eth0
    virtual_router_id 58
    priority 99            #priority 
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1058
    }
    virtual_ipaddress {
    192.168.1.101           #vip
    }
    track_script {
    chk_httpd
    }
}
========================================================
 
访问http://192.168.1.101
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