Nginx 作为目前最流行的开源反向代理 HTTP Server,实现资源缓存、web server 负载均衡等功能,Tomcat 提供动态 web 内容,redis 提供高效缓存构成一个完美 web 站点组合,但必须借助 redis-session-manager-tomcat.jar 包才能实现 session 共享。session-manager 负责会话管理,commons-pool 是共享池,jedis 是连接 redis 组件,三者协调共享,缺一不可。
特别注意:redis-session-manager-tomcat.jar 是通过 maven 打包而成,与 context.xml 内容相对应,commons-pool.jar jedis.jar 版本要求严格,千万不能轻视。
架构图
实验环境
IP Roles port
station11192.168.1.11 nginx centos6.8 端口:80 版本:1.10.2
station11192.168.1.11 redis 2.4.10 端口:6379
station12192.168.1.12 tomcatA centos6.8 端口:8080
station13192.168.1.13 tomcatB centos6.8 端口:8080 版本:Jdk:1.8.0_91 Tomcat: 7.0.75
Station11 安装 redis
[root@station11 ~]# yum -y install redis
redis-2.4.10-1.el6.x86_64
[root@station11 ~]# mkdir -pv /data/redis
[root@station11 ~]# chown -R redis.root /data/redis
[root@station11 ~]# vim /etc/redis.conf
- daemonize yes
- bind 192.168.1.11
- logfile /var/log/redis/redis.log
- dir /data/redis
- requirepass redhat
[root@station11 ~]# echo vm.overcommit_memory=1 >> /etc/sysctl.conf
[root@station11 ~]# sysctl vm.overcommit_memory=1
[root@station11 ~]# chown redis.root /var/log/redis/redis.log
[root@station11 ~]#service redis start
[root@station11 ~]# netstat -nutlp | grep redis
- tcp 0 0 192.168.1.11:6379 0.0.0.0:* LISTEN 3568/redis-server
[root@station11 ~]# redis-cli -h 192.168.1.11 -p 6379 -a redhat
- redis 192.168.1.11:6379> select 0
- OK
[root@station12 ~]# ls
apache-tomcat-7.0.75.tar.gz jdk-8u91-linux-x64.tar.gz
[root@station12 ~]# tar zxvf jdk-8u91-linux-x64.tar.gz -C /usr/local/
[root@station12 ~]# ln -sv /usr/local/jdk1.8.0_91/ /usr/local/java
[root@station12 ~]# cat > /etc/profile.d/java.sh << EOF
- JAVA_HOME=/usr/local/java/
- JRE_HOME=/usr/local/java/
- PATH=$JAVA_HOME/bin:$PATH
- export JAVA_HOME JRE_HOME PATH
- EOF
[root@station12 ~]# java -version
- java version "1.8.0_91"
- Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
- Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)
[root@station12 ~]# tar zxvf apache-tomcat-7.0.75.tar.gz -C /usr/local/
[root@station12 ~]# ln -sv /usr/local/apache-tomcat-7.0.75/ /usr/local/tomcat
[root@station12 ~]# cat > /etc/profile.d/tomcat.sh << EOF
- export CATALINA_HOME=/usr/local/tomcat
- export PATH=$CATALINA_HOME/bin:$PATH
- EOF
[root@station12 ~]#. /etc/profile.d/tomcat.sh
[root@station12 ~]# catalina.sh version
- Using CATALINA_BASE: /usr/local/tomcat
- Using CATALINA_HOME: /usr/local/tomcat
- Using CATALINA_TMPDIR: /usr/local/tomcat/temp
- Using JRE_HOME: /usr/local/java/
- Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar
- Server version: Apache Tomcat/7.0.75
- Server built: Jan 18 2017 20:54:42 UTC
- Server number: 7.0.75.0
- OS Name: Linux
- OS Version: 2.6.32-642.el6.x86_64
- Architecture: amd64
- JVM Version: 1.8.0_91-b14
- JVM Vendor: Oracle Corporation
[root@station12 ~]#vim /etc/init.d/tomcat
- #!/bin/sh
- # Tomcat init script for Linux.
- #
- # chkconfig: 2345 96 14
- # description: The Apache Tomcat servlet/JSP container.
- # JAVA_OPTS='-Xms64m -Xmx128m'
- #-Xms64m指的是java虚拟机启动时占用的内存为64M -Xmx128m指的是java虚拟机最大能使用的内存为128M;
- JAVA_HOME=/usr/local/java
- CATALINA_HOME=/usr/local/tomcat
- export JAVA_HOME CATALINA_HOME
- case $1 in
- start)
- exec $CATALINA_HOME/bin/catalina.sh start ;;
- stop)
- exec $CATALINA_HOME/bin/catalina.sh stop;;
- restart)
- $CATALINA_HOME/bin/catalina.sh stop
- sleep 2
- exec $CATALINA_HOME/bin/catalina.sh start ;;
- *)
- echo "Usage: `basename $0` {start|stop|restart}"
- exit 1
- ;;
- esac
[root@station12 ~]# chmod +x /etc/init.d/tomcat
[root@station12 ~]# chkconfig --add tomcat
[root@station12 tomcat]# service tomcat start
[root@station12 tomcat]# netstat -nutlp | grep java
- tcp 0 0 ::ffff:127.0.0.1:8005 :::* LISTEN 1977/java
- tcp 0 0 :::8009 :::* LISTEN 1977/java
- tcp 0 0 :::8080 :::* LISTEN 1977/java
[root@station12 ~]# cd /usr/local/tomcat
[root@station12 tomcat]# vim webapps/ROOT/test.jsp
- <%@ page language="java" %>
- <html>
- <head>
- <title>
- Tomcat12
- </title>
- </head>
- <body>
- <h1>
- <font color="red">
- www.xuefeng.com
- </font>
- </h1>
- <table align="centre" border="1">
- <tr>
- <td>
- Session ID
- </td>
- <% session.setAttribute( "www.xuefeng.com", "www.xuefeng.com"); %>
- <td>
- <%= session.getId() %>
- </td>
- </tr>
- <tr>
- <td>
- Created on
- </td>
- <td>
- <%= session.getCreationTime() %>
- </td>
- </tr>
- </table>
- </body>
- </html>
station13 相同安装 jdk 和 tomcat
更改主机名和颜色
[root@station12~]# cp commons-pool2-2.4.2.jar jedis-2.8.1.jar tomcat-redis-session-manage-tomcat7.jar/usr/local/tomcat/lib/
[root@station12conf]# vim context.xml
- <ValveclassName="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve"
- />
- 注意空格+ />
- <ManagerclassName="com.orangefunction.tomcat.redissessions.RedisSessionManager"
- host="192.168.1.11" port="6379" database="0" password="redhat"
- />
- 注意没有空格+ />
[root@station12conf]# vim server.xml
- 注销端口8009行
- <!-- <Connector port="8009"protocol="AJP/1.3" redirectPort="8443" /> -->
- autoDeploytrue改false
- <Host name="localhost" appBase="webapps"
- unpackWARs="true"autoDeploy="false">
[root@station12tomcat]# service tomcat restart
[root@station12tomcat]# tail -f /logs/catalina.out
- Feb 05,2017 6:28:42 PM com.orangefunction.tomcat.redissessions.RedisSessionManager startInternal
- INFO:Attached to RedisSessionHandlerValve
- Feb 05,2017 6:28:42 PM com.orangefunction.tomcat.redissessions.RedisSessionManager initializeSerializer
- INFO:Attempting to use serializer:com.orangefunction.tomcat.redissessions.JavaSerializer
- Feb 05,2017 6:28:42 PM com.orangefunction.tomcat.redissessions.RedisSessionManagerstartInternal
- INFO:Will expire sessions after 1800 seconds
[root@station13~]# cp commons-pool2-2.4.2.jar jedis-2.8.1.jar tomcat-redis-session-manage-tomcat7.jar/usr/local/tomcat/lib/
[root@station13conf]# rm -f context.xml server.xml
[root@station13conf]# scp 192.168.1.12:/usr/local/tomcat/conf/{context.xml,server.xml} .
[root@station13conf]# service tomcat restart
[root@station12tomcat]# redis-cli -h 192.168.1.11 -p 6379 -a redhat
redis192.168.1.11:6379> keys *
- 1)"8530FAC0B67966A27E80D6D589D93E5A"
- 2)"09AD4D396865B1954F644D150F8A6A85"
- 可以看到2个独立会话ID已经存放在redis中
Station11 最后安装 nginx
[root@station11~]# yum -y install nginx
nginx.x86_640:1.10.2-1.el6
[root@station11nginx]# mv /etc/nginx/conf.d/default.conf /etc/nginx/conf.d/default.conf.0
[root@station11~]# vim /etc/nginx/nginx.conf
- 在http 段中添加
- upstream backend {
- server 192.168.1.12:8080;
- server 192.168.1.13:8080;
- }
- server {
- location / {
- proxy_pass http://backend;
- proxy_redirect off;
- proxy_set_header Host $host;
- proxy_set_header X-Real-IP $remote_addr;
- proxy_set_headerX-Forworded-For $proxy_add_x_forwarded_for;
- }
- }
[root@station11~]# service nginx start
刷新 192.168.1.11/test.jsp 会看到 sessionID 保持不变,但 tititle 主机名和网页内 head 域名一直在变,说明内容来自后端 2 台主机。但 3 者的 sessionID 不同。
来源: http://www.bubuko.com/infodetail-1962709.html