memcached服务搭建及session共享

t4fewq · 发表于 2014-9-25 13:42:17

memcached+session共享

目标：客户端通过nginx代理访问tomcat服务器，两台tomcat服务器共用memcached服务器，访问的sessionid存放在memcached服务器中，一台做主服务器，一台做备用服务器，当主服务器宕机，启用备用备用服务器
环境准备：
nginx服务器：192.168.1.1
两台基于tomcat的服务器：192.168.1.2  192.168.1.3
两台memcached服务器：192.168.1.4  192.168.1.5
安装gcc*开发环境

1.配置memcached服务（另一台做相同的配置）
首先安装依赖库
下载libevent-2.0版本的和memcached-1.4版本的
[iyunv@www memceached-package]# tar -zxf libevent-2.0.15-stable.tar.gz
[iyunv@www memceached-package]# cd libevent-2.0.15-stable
[iyunv@www libevent-2.0.15-stable]# ./configure && make && make install
安装memcached源码包
[iyunv@www memceached-package]# tar -zxf memcached-1.4.5.tar.gz
[iyunv@www memceached-package]# cd memcached-1.4.5
[iyunv@www memcached-1.4.5]# ./configure && make && make install
由于依赖包安装的路径不能被系统读取到，所以写一个配置文件让系统能够识别安装的路径
[iyunv@www memcached-1.4.5]# vim /etc/ld.so.conf.d/libevent.conf
/usr/local/lib/
重新加载配置文件
[iyunv@www memcached-1.4.5]# ldconfig /etc/ld.so.conf.d/libevent.conf
查看memcached帮助
[iyunv@www memcached-1.4.5]# /usr/local/bin/memcached -h
启动服务
[iyunv@www memcached-1.4.5]# /usr/local/bin/memcached -u root -m 100M -n 10 -f 2 -d -vvv
查看端口号是否启动成功
[iyunv@www memcached-1.4.5]# netstat -anput | grep 11211
本机测试能否存取
[iyunv@www memcached-1.4.5]# telnet 192.168.1.4 11211
Trying 192.168.1.4...
Connected to 192.168.1.4 (192.168.1.4).
Escape character is '^]'.
set name 0 180 3 //将key（name） value（jim）存入
jim
STORED
get name  // 取出name的值
VALUE name 0 3
jim
END
quit
Connection closed by foreign host.
服务能实现正常的存取功能，结束！

2.配置tomcat服务器（另一个做相同的配置，jsp改变一下以示区别）

下载 jdk-6u27-linux-i586.bin apache-tomcat-6.0.32.tar.gz
首先安装JDK
[iyunv@localhost memcached+session-package]# chmod +x jdk-6u27-linux-i586.bin
[iyunv@localhost memcached+session-package]# ./jdk-6u27-linux-i586.bin
[iyunv@localhost memcached+session-package]# cp jdk1.6.0_27/ /usr/local/jdk

导入环境变量
[iyunv@localhost memcached+session-package]# vim /etc/bashrc
文件末尾添加
export JRE_HOME=/usr/local/jdk
export JAVA_BIN=/usr/local/jdk/bin
export PATH=$JRE_HOME/bin:$PATH
export  CLASSPATH=.:$JRE_HOME/lib/dt.jar:$JRE_HOME/lib/tools.jar
export  JRE_HOME  JAVA_BIN  PATH CLASSPATH

重新加载配置文件
[iyunv@localhost memcached+session-package]# source /etc/bashrc
[iyunv@localhost ~]# java -version
java version "1.6.0_27"

安装tomcat
[iyunv@localhost memcached+session-package]# tar -zxf apache-tomcat-6.0.32.tar.gz
[iyunv@localhost memcached+session-package]# cp apache-tomcat-6.0.32 /usr/local/tomcat
[iyunv@localhost memcached+session-package]# /usr/local/tomcat/bin/startup.sh

查看端口是否启动
[iyunv@localhost memcached+session-package]# netstat -anput | grep 8080
tcp       0    0 :::8080                   :::*                      LISTEN    18162/java

访问主页
[iyunv@localhost ~]# elinks --dump 192.168.1.2:8080

添加一个jsp的动态网页
[iyunv@localhost ~]# vim /usr/local/tomcat/webapps/ROOT/test.jsp
<html>
      <body bgcolor="green">
         <center>
            <%=  request.getSession().getId()  %>
            <h1>tomcatA 43</h1>
         </center>
      </body>
</html>
[iyunv@localhost ~]# elinks --dump 192.168.1.2:8080/test.jsp
                  8CD662E4983B212941DEFE18F0907EE4-memA

                                 tomcatB 43
tomcat服务器已经能成功访问！

3.添加tomcat连接memcached的接口

下载以下包
kryo-1.04.jar                      memcached-session-manager-tc6-1.5.1.jar
kryo-serializers-0.9.jar          minlog-1.2.jar
memcached-2.5.jar                   msm-kryo-serializer-1.5.1.jar
memcached-session-manager-1.5.1.jar  reflectasm-1.01.jar

将以上所有包复制到tomcat的库目录中
[iyunv@localhost session]# cp * /usr/local/tomcat/lib/

修改tomcat的配置文件
[iyunv@localhost session]# vim /usr/local/tomcat/conf/context.xml
在<Context>  </Context>添加指明memcached两个主机的IP地址及端口号和备用memcached服务器
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
memcachedNodes="memA:192.168.1.4:11211 memB:192.168.1.5:11211"
failoverNodes="memB"
requestUrilgnorePattern=".*\(ico|png|gif|jpg|css|js)$"
transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory"
/>

重启tomcat使配置生效
[iyunv@localhost session]# /usr/local/tomcat/bin/shutdown.sh
[iyunv@localhost session]# /usr/local/tomcat/bin/startup.sh

4.配置nginx服务器
修改配置文件
[iyunv@localhost ~]# vim /usr/local/nginx/conf/nginx.conf
worker_processes  1;
events {
worker_connections  1024;
}
http {
include    mime.types;
default_type  application/octet-stream;
sendfile       on;
keepalive_timeout  65;
upstream  "webgroup"  {
         server 192.168.1.2:8080;
         server 192.168.1.3:8080;
   }
server {
      listen    80;
      server_name  localhost;
      location / {
         # root html;
         # index  index.html index.htm;
         proxy_pass  http://webgroup;
      }
      error_page 500 502 503 504  /50x.html;
      location = /50x.html {
         root html;
      }
}
}
重新启动nginx服务
[iyunv@localhost ~]# /usr/local/nginx/sbin/nginx -s stop
[iyunv@localhost ~]# /usr/local/nginx/sbin/nginx

5.客户端测试

浏览器测试
http://192.168.1.1/test.jsp
刷新网页发现sessionid不变，证明memcached已经生效

将主memcached服务器关闭，测试备用服务器
[iyunv@www ~]# ifconfig eth0 | head -2
eth0    Link encap:Ethernet  HWaddr 00:0C:29:FD:5B:B1
      inet addr:192.168.118.3  Bcast:192.168.118.255  Mask:255.255.255.0
[iyunv@www ~]# netstat -anput | grep 11211
tcp       0    0 0.0.0.0:11211             0.0.0.0:*                LISTEN    7775/memcached
[iyunv@www ~]# pkill -9 memcached
[iyunv@www ~]# netstat -anput | grep 11211

客户端再测试
http://192.168.1.1/test.jsp
刷新网页发现sessionid不变，证明备用memcached已经生效

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