Nginx+tomcat+redis集羣共享session實現負載均衡

 

1.nginx是一款輕量級兼備高性能的Http和反向代理服務器。所謂反向代理就是指用戶發起訪問請求,由代理服務器接受,而後將請求轉發給正式服務器,而且將正式服務器處理完的數據返回給客戶單,此時代理服務器就表現爲一個服務器。php

進入nginx的安裝目錄後,輸入相關命令,一個窗口一閃而過,在任務管理器中能夠找到它的進程。html

瀏覽器輸入localhost,能夠看到nginx的歡迎頁面!java

 

修改nginx的配置文件,nginx

       worker_processes:工做進程個數,web

       worker_connections:單個進程最大鏈接數,redis

       server:每個server至關於一個代理服務器,瀏覽器

       listern:監聽端口,默認80,tomcat

       server_name:當前服務的域名,能夠有多個,用空格分割,服務器

       location:表示匹配的路徑,配置/ 表示全部請求都被匹配到這裏,session

       index:當沒有指定主頁時,默認會選擇這個指定的文件,可多個,空格分割 ,

        proxy_pass:請求轉向自定義的服務器列表,

       upstream name{} :服務器集羣名稱    

  1. 而後再cmd中輸入命令nginx -s reload重啓nginx;
  2. 部署三個Tomcat,分別修改server.xml 和context.xml

server.xml依次修改 Server的port爲8005,8006,8007 ,Connector的port爲8081 8082 8083,8009 8010 8011

 

context.xml增長

 

 

 並在webapps\ROOT下增長session.jsp ,加上標記tomcat 1 tomcat 2 tomcat 3

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>shared session</title>
</head>
<body>
    <br>session id=<%=session.getId()%>
    <br>tomcat 1
</body>
</html>

將以下幾個jar包複製到${TOMCAT_HOME}/lib下

tomcat-redis-session-manager-VERSION.jar 
jedis-2.5.2.jar 
commons-pool2-2.2.jar

3.修改Ngnix的配置文件增長負載均衡配置
#user  nobody;
#nginx進程數,建議設置爲等於CPU總核心數
worker_processes  4;

error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#進程pid文件
pid        logs/nginx.pid;


events {
    worker_connections  65535;
}


http {
    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;
	
	upstream mt.com {
		#upstream的負載均衡,weight是權重,可根據機器配置定義權重.weight參數表示權值,權值越高被分配的概率越大.
		server 127.0.0.1:8081 weight=1;
		server 127.0.0.1:8082 weight=2;
		server 127.0.0.1:8083 weight=3;
	}

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            #root   html;
            index  index.html index.htm;
			proxy_pass http://mt.com;
			proxy_set_header X-Real-IP $remote_addr;
			#容許客戶端請求的最大單文件字節數
			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;
    #    }
    #}

}

 

 4.啓動redis,tomcat1,tomcat2,tomcat3 訪問localhost/session.jsp且不斷刷新

能夠看到每次刷新均可能訪問不一樣的tomcat,實現了負載均衡,並且session都是一致的,保證了session的一致性

 

 

 

原文參照: https://www.cnblogs.com/zhrxidian/p/5432886.html

      https://www.cnblogs.com/linjiqin/p/5761281.html

      http://blog.csdn.net/lipc_/article/details/52766884

      https://www.cnblogs.com/machanghai/p/5956195.html

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