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参考:http://www.cnblogs.com/lengfo/p/4260363.html
近期为CAS-SSO准备搭建Session共享,小编研究了下基于Nginx负载均衡,分布式Tomcat+Redis 存储Session,实现分布式Tomcat的Session共享,for window下~~~不要问我为什么window下(linux的资源太多了~~~)
原理:
首先,sessionID的产生,当用户发起请求时,web服务器将产生一个sessionID返回给用户,由浏览器cookie记录该sessionID,下次再请求,浏览器将cookie记录的sessionID一并发给web服务器,web服务器判断请求头中含有sessionID,则不再新建sessionID,也说明该用户已登录or已访问.........
注:浏览器发送的请求中有个Host字段,标记请求的目标服务器,即使访问的应用是相同的,但由于不同的目标请求服务器,产生并返回的sessionID肯定不一样的....所以这里必须有负载均衡器,如Nginx or Haproxy来做转发,确保请求的目标服务器都指向负载均衡那台,然后通过cookie=sessionID,发送给web服务器,获取对应的session内容。
其次,采用Redis做session缓存服务器,将原本tomcat自身存储的session,转移存储到redis缓存服务器上,实现分布式的tomcat共享session。
1.下载Nginx for winow(linux的请无视)
2.下载tomcat7
3.下载redis for window64 只有64bit,不要问为什么没有32位(linux的请无视)
4.下载tomcat7依赖redis 必须的jar tomcat-redis-session-manager-1.2-tomcat-7.jar、jedis-2.1.0.jar、commons-pool-1.6.jar 注意版本必须配对..jedis-2.1对应commons-pool-1.6;
详见附件
5.配置nginx.conf,红色部分为新增修改地方
#user nobody;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
#采用轮询方式,配置对应的tomcat访问,“site”可以自定义
upstream site {
server 10.89.113.112:8080 weight=1;
server 10.92.2.23:8091 weight=1;
}
include mime.types;
default_type application/octet-stream;
#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
server {
listen 80;
#server_name 用于访问Nginx的url,可以用域名如“www.xxx.com” 自定义
server_name 10.89.113.184;
#charset koi8-r;
#access_log logs/host.access.log main;
#指定web上下文
location /web-one {
#root html;
#index index.html index.htm index.jsp;
#proxy_pass "site"必须同upstream 配置的名称一致
proxy_pass http://site;
#proxy_set_header X-Real-IP $remote_addr;
#client_max_body_size 100m;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}
2.配置redis.windows.conf ,搜索maxheap 并新增maxheap 1024000000,可以写bat启动脚本startup.bat
redis-server redis.windows.conf
3.新建web-app,修改index.jsp,新增打印sessionId,用于判断是否session共享成功
<html>
<body>
<h2>Hello World!! web-one-tomcat.1 </h2>
SessionID:<%=session.getId()%>
</body>
</html>
4. 将tomcat7依赖的redis 相关的jar tomcat-redis-session-manager-1.2-tomcat-7.jar、jedis-2.1.0.jar、commons- pool-1.6.jar copyto “lib”文件夹下
5.修改“conf”文件夹下的context.xml,将原先的<Manager>内容注释掉;新增以下内容
<!--redis config-->
<Valve className="com.radiadesign.catalina.session.RedisSessionHandlerValve" />
<!-- host: optional: defaults to "localhost" -->
<!-- port: optional: defaults to "6379" -->
<!-- database: optional: defaults to "0" -->
<!-- maxInactiveInterval:optional: defaults to "60" (in seconds) -->
<Manager className="com.radiadesign.catalina.session.RedisSessionManager"
host="10.89.113.112" <!-- host: optional: defaults to "localhost" -->
port="6379" <!-- port: optional: defaults to "6379" -->
database="0"<!-- database: optional: defaults to "0" -->
maxInactiveInterval="180" /> <!-- maxInactiveInterval:optional: defaults to "60" (in seconds) -->
6.依次按照,启动redis、tocmat、nginx~~
7.访问http://10.89.113.184/web-one <---nginx所配置的访问地址,将自动负载路由到不同的tomcat上,根据现实出相同的sessionID,实现session间共享; |
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