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/>

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