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

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 {

     [e-mail]

     [e-mail]

     [e-mail]

   }

   notification_email_from [e-mail]

   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 {

     [e-mail]

     [e-mail]

     [e-mail]

   }

   notification_email_from [e-mail]

   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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