tomcat session会话保持实验-之Nginx+tomcat+memcached
实验要求
1、nginx+tomcat 负载均衡
2、memcached 会话保持
实验拓扑
![wKioL1ijJdSjYRE5AAApeDFoBAw207.jpg]( "QQ截图20170214230651.jpg")
ip网络规划
Nginxnode2:172.16.76.20
tomcatAnode3:172.16.76.30 memcached
tomcatBnode4:172.16.76.40 memcached
基础配置
node2
[root@node2~]# yum install nginx –y
node3
[root@node3~]# yum install tomcat –y
[root@node3~]# cd /var/lib/tomcat/webapps/
[root@node3 webapps]# mkdir -pv test/{claess,lib,WEB-INF
[root@node3 webapps]#vim test/index.jsp
<%@ page language="java" %>
<html>
<head><title>TomcatA</title></head>
<body>
<h1><fontcolor="red">TomcatA.linuxinfo.top</font></h1>
<tablealign="centre" border="1">
<tr>
<td>SessionID</td>
<%session.setAttribute("linuxinfo.top","linuxinfo.top");%>
<td><%=session.getId() %></td>
</tr>
<tr>
<td>Createdon</td>
<td><%=session.getCreationTime() %></td>
</tr>
</table>
</body>
</html>
[root@node3 ~]# systemctl restart tomcat
![wKioL1ijJn2SluBwAABCZegxhxc688.jpg]( "QQ截图20170208224857.jpg")
node4
[root@node4~]# yum install tomcat –y
[root@node4~]# cd /var/lib/tomcat/webapps/
[root@node4 webapps]# mkdir -pv test/{claess,lib,WEB-INF
[root@node4 webapps]#vim test/index.jsp
<%@ page language="java" %>
<html>
<head><title>TomcatB</title></head>
<body>
<h1><font color="blue">TomcatA.linuxinfo.top</font></h1>
<tablealign="centre" border="1">
<tr>
<td>SessionID</td>
<%session.setAttribute("linuxinfo.top","linuxinfo.top");%>
<td><%=session.getId() %></td>
</tr>
<tr>
<td>Createdon</td>
<td><%=session.getCreationTime() %></td>
</tr>
</table>
</body>
</html>
[root@node4 ~]# systemctl restart tomcat
![wKioL1ijJmCh34WEAABC-A4JPwM971.jpg]( "QQ截图20170208224907.jpg")
Nginx配置
root@node2~]# cat /etc/nginx/nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
http {
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status$body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
upstream tomcatser { #服务器组配置负载均衡
server172.16.76.30:8080;
server172.16.76.40:8080;
# ip_hash
}
access_log /var/log/nginx/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
include/etc/nginx/conf.d/*.conf;
server {
listen 80default_server;
listen [::]:80 default_server;
server_name _;
root /usr/share/nginx/html;
# Load configurationfiles for the default server block.
include/etc/nginx/default.d/*.conf;
#location 代理至后端服务器组；负载均衡
location / {
proxy_pass http://tomcatser;
location ~* (\.jsp|do)${
proxy_passhttp://tomcatser;
}
}
error_page 404 /404.html;
location =/40x.html {
}
error_page 500 502 503504 /50x.html;
location =/50x.html {
}
}
[root@node2 ~]# systemctlrestart nginx
memcached
下载如下jar文件至各tomcat节点的tomcat安装目录下的lib目录中，其中的${version}要换成你所需要的版本号，tc${6,7,8}要换成与tomcat版本相同的版本号。
memcached-session-manager-${version}.jar
memcached-session-manager-tc${6,7,8}-${version}.jar
spymemcached-${version}.jar
msm-javolution-serializer-${version}.jar
javolution-${version}.jar
本实验所用jar包已上传（仅供实验版本），各位可以去下面链接下载：
http://down.51cto.com/3363989
或者到官方下载（这个应该被。。。）
memcached-session-manager项目地址，https://code.google.com/archive/p/memcached-session-manager/downloads
本实验环境版本如下：
[root@node3~]# tomcat version
Server version: Apache Tomcat/7.0.69
Server built: Nov 6 201601:55:51 UTC
Server number: 7.0.69.0
OS Name: Linux
OS Version: 3.10.0-327.el7.x86_64
Architecture: amd64
JVM Version: 1.8.0_121-b13
JVM Vendor: OracleCorporation
安装memcached
[root@node3~]# yum install memcached –y
[root@node4~]# yum install memcached -y
tomcat
ndoe3
1、[root@node3 ~]# vim /etc/tomcat/server.xml
分别在两个tomcat上的某host上定义一个用于测试的context容器，并在其中创建一个会话管理器，如下所示：
<Context path="/test"docBase="/usr/local/tomcat/webapps/test"reloadable="true">
<ManagerclassName="de.javakaffee.web.msm.MemcachedBackupSessionManager"
memcachedNodes="n1:172.16.100.9:11211,n2:172.16.100.10:11211"
failoverNodes="n1"
requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$" transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"/>
</Context>
2、 在<Engine name="Catalina"defaultHost="localhost"> 中添加jvmRoute="TomcatA"即
<Enginename="Catalina" defaultHost="localhost"jvmRoute="TomcatA">
#tomcatB主机 则将此修改为tomcatB
node4：
1、 将node3 tomcat配置文件server.xml拷贝一份至本机；
[root@node4~]# cd /etc/tomcat/
[root@node4 tomcat]# scp172.16.76.30:/etc/tomcat/server.xml .
2、注：修改 <Engine> 中jvmRoute=TomcatB；
重启所有服务
[root@node2~]# systemctl restart nginx
[root@node3~]# systemctl restart tomcat
[root@node3~]# systemctl restart memcached
[root@node4~]# systemctl restart tomcat
[root@node4~]# systemctl restart memcached
测试
![wKioL1ijJUuiZ0AGAARkU2dAPcU543.gif]( "tomcat-session-memcached.gif")
至此实验完成；访问172.16.76.20/test/实现nginx负载均衡同时利用memcached实现保持会话；
