Apache的负载均衡之mod_jk模块实现

          Apache的负载均衡之mod_jk模块实现

    先配置mod_jk的代理功能，

[root@org ~]# yum install -y httpd-devel

[root@org ~]# rpm -ql httpd-devel

/usr/sbin/apxs

apxs是httpd安装外部模块必备的

[root@org ~]# yum groupinstall"Development Tools" "Server Platform Development" -y //所需要的包组。

    编译安装需要的环境。

[root@org ~]# tar xftomcat-connectors-1.2.40-src.tar.gz

[root@org ~]# ls

a                            install.log              oracle

apache-tomcat-7.0.56.tar.gz  install.log.syslog       root20141030092112523.zip

apache-tomcat-8.0.20.tar.gz  jdk-8u31-linux-i586.rpm  tomcat-connectors-1.2.40-src

b                            lamp                    tomcat-connectors-1.2.40-src.tar.gz

[root@org ~]# cd tomcat-connectors-1.2.40-src

[root@org tomcat-connectors-1.2.40-src]# ls

conf docs  HOWTO-RELEASE.txt  jkstatus LICENSE  native  NOTICE README.txt  support  tools xdocs

[root@org tomcat-connectors-1.2.40-src]# cdnative/

[root@org native]# ls

aclocal.m4 apache-2.0    BUILDING.txt  configure    docs  Makefile.am  netscape   scripts     TODO.txt

apache-1.3 buildconf.sh  common        configure.ac  iis  Makefile.in  README.txt  STATUS.txt

[root@org native]# ./configure--with-apxs=/usr/sbin/apxs

[root@org native]# make && makeinstall

              。

              。

              。

----------------------------------------------------------------------

chmod 755/usr/lib64/httpd/modules/mod_jk.so

Please be sure to arrange/etc/httpd/conf/httpd.conf...

make[1]: Leaving directory`/root/tomcat-connectors-1.2.40-src/native/apache-2.0‘

make[1]: Entering directory`/root/tomcat-connectors-1.2.40-src/native‘

make[2]: Entering directory`/root/tomcat-connectors-1.2.40-src/native‘

make[2]: Nothing to be done for`install-exec-am‘.

make[2]: Nothing to be done for`install-data-am‘.

make[2]: Leaving directory`/root/tomcat-connectors-1.2.40-src/native‘

make[1]: Leaving directory`/root/tomcat-connectors-1.2.40-src/native‘

[root@org ~]# cd /etc/httpd

[root@org httpd]# ls

conf conf.d  logs  modules run

[root@org httpd]# cd conf.d/

[root@org conf.d]# ls

php.conf README  welcome.conf

[root@org conf.d]# vim mod_jk.conf

# Load the mod_jk

LoadModule jk_module  modules/mod_jk.so

JkWorkersFile  /etc/httpd/conf.d/workers.properties

JkLogFile logs/mod_jk.log

JkLogLevel debug

JkMount /*  TomcatA

JkMount /status/  statA

~                                    

[root@org conf.d]# vim/etc/httpd/conf.d/workers.properties

worker.list = TomcatA,statA

worker.TomcatA.port=8009

worker.TomcatA.host=192.168.1.116

worker.TomcatA.type=ajp13

worker.TomcatA.lbfactor=1

worker.statA.type = status

[root@org conf.d]# httpd -t

Syntax OK

[root@org conf.d]# service httpd restart

Stopping httpd:                                           [  OK  ]

Starting httpd:                                            [ OK  ]

[root@org conf.d]#

    至此，一个基于mod_jk模块与后端名为TomcatA的worker通信的配置已经完成，重启httpd服务即可生效。

    还有状态信息  

要实现负载均衡，至少需要两个tomcat还在本机上操作，配置另一个版本的tomcat,配置完成之后访问http://192.168.1.116:9080

   mod_jk可直接支持负载均衡，需要启用一个特殊型的worker：lb。

[root@org conf.d]# vim mod_jk.conf

 #Load the mod_jk

LoadModule jk_module  modules/mod_jk.so

JkWorkersFile  /etc/httpd/conf.d/workers.properties

JkLogFile logs/mod_jk.log

JkLogLevel debug

JkMount /*  lbcluster1

JkMount /status/  statA

~                      

[root@org conf.d]# vim workers.properties

worker.list = lbcluster1,statA

worker.TomcatA.port=8009

worker.TomcatA.host=192.168.1.116

worker.TomcatA.type=ajp13

worker.TomcatA.lbfactor=1

worker.TomcatB.port=9009

worker.TomcatB.host=192.168.1.116

worker.TomcatB.type=ajp13

worker.TomcatB.lbfactor=1

worker.lbcluster1.type = lb

sorker.lbcluster1.sticky_session = 0

worker.lbcluster1.balance_workers =TomcatA, TomcatB

worker.statA.type = status

~                                                                                                          

[root@org conf.d]# httpd -t

Syntax OK

[root@org bin]# service httpd restart

Stopping httpd:                                           [  OK  ]

Starting httpd:                                           [  OK  ]

[root@org bin]#

    到此mod_jk实现负载均衡就配置好了，测试如下。

    访问http://192.168.1.116

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