nginx的学习--反向代理与负载均衡

最经用到nginx做反向代理和负载均衡，之前一直用的apache，同事说nginx比apache速度更快、占用内存更少等优点。今天就试着配置，折腾了大半天，终于搞定了，但是seesion共享还没有搞定。

部署了3个tomcat，分别在不同的服务器，用ngnix代理和负载，配置文件如下，主要是修改conf/nginx.conf文件：

#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 {
    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;
    

   #需要负载的服务器
    upstream test_server_pool{
  server 120.*.*.*:8080 weight=4 max_fails=2 fail_timeout=30s;
  server 127.0.0.1:8082 weight=4 max_fails=2 fail_timeout=30s;
  server 192.168.1.110:8080 weight=2 max_fails=2 fail_timeout=30s;
}
 
    server {
        listen       80;
        server_name  localhost;


        #charset koi8-r;


        #access_log  logs/host.access.log  main;


        location / {
            root   html;
            index  index.html index.htm;
        }

               #反向代理test_server_pool
location /yayi/{
  proxy_next_upstream http_502 http_504 error timeout invalid_header;
  proxy_pass http://test_server_pool/;
  proxy_cookie_path / /yayi/;
  proxy_set_header Host $host;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;


}

        #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;
    #    }
    #}


}

在这个过程遇到问题是一直代理不成功，找了很久原因发现是 proxy_pass http://test_server_pool/;少了“/”符号导致的