详解Nginx HTTP负载均衡和反向代理配置

  [root@data conf]# vim nginx.conf   user www www;   worker_processes 10;       error_log /var/log/nginx/nginx_error.log;       pid    logs/nginx.pid;       worker_rlimit_nofile 65535   events {     use epoll;     worker_connections 65535;   }       http {     include    mime.types;     default_type application/octet-stream;          server_names_hash_bucket_size 128;     client_header_buffer_size 32k;     large_client_header_buffers 4 32k;     sendfile    on;     tcp_nopush   on;         keepalive_timeout 65;     fastcgi_connect_timeout 300;     fastcgi_send_timeout 300;     fastcgi_read_timeout 300;     fastcgi_buffer_size 64k;     fastcgi_buffers 4 64k;     fastcgi_busy_buffers_size 128k;     fastcgi_temp_file_write_size 128k;         gzip on;     gzip_min_length 1k;     gzip_buffers   4 16k;     gzip_http_version 1.0;     gzip_comp_level 2;     gzip_types    text/plain application/x-javascript text/css application/xml;     gzip_vary on;         client_max_body_size 300m;  #允许客户端请求的最大单个文件字节数     client_body_buffer_size 128k; #缓冲区代理缓冲用户端请求的最大字节数     proxy_connect_timeout 600;  #跟后端服务器连接超时时间，发起握手等候响应超时时间     proxy_read_timeout  600;  #连接成功后，等候后端服务器响应时间，在后端排队中等候     proxy_send_timeout 600; #后端服务器数据回传时间，就是在规定时间内后端服务器必须传完所有数     proxy_buffer_size 16k; #代理请求缓存区，这个缓存区间会保存用户的信息以供nginx进行规则处理，一般只要能保存下头信息即可     proxy_buffers 4 32k; #同上，告诉nginx保存单个用的几个Buffer最大用多大空间     proxy_busy_buffers_size 54k; #如果系统很忙可以申请用的几个更大的proxy_buffer     proxy_temp_file_write_size 64k; #缓存临时文件大小         upstream php_server_pool {     server 192.168.1.100:80 weight=4 max_fails=2 fail_timeout=30s;     server 192.168.1.101:80 weight=4 max_fails=2 fail_timeout=30s;     server 192.168.1.102:80 weight=4 max_fails=2 fail_timeout=30s;   }     upstream message_server_pool {     server 192.168.1.103:3245;     server 192.168.1.104:3245 down;   }     upstream bbs_server_pool {     server 192.168.1.105:80 weight=4 max_fails=2 fail_timeout=30s;     server 192.168.1.106:80 weight=4 max_fails=2 fail_timeout=30s;     server 192.168.1.107:80 weight=4 max_fails=2 fail_timeout=30s;     server 192.168.1.108:80 weight=4 max_fails=2 fail_timeout=30s;   }   #第一个虚拟主机，反向代理php_server_pool这组服务器     server {       listen    80;       server_name www.chlinux.net;       access_log /var/log/nginx/www.chlinux.net_access.log main;       location / {   #如果后端服务器返回502、504、执行超时等错误，自动将请求转发到upstream负载均衡池中的另一台服务器，实现故障转移。      proxy_next_upstream http_502 http_504 error timeout invalid_header;      proxy_pass http://php_server_pool;      proxy_set_header Host www.chlinux.net;      proxy_set_header X-Forwarded-For $remote_addr;       }     }   #第二个虚拟主机     server {       listen    80;       server_name bbs.chlinux.net;       access_log /var/log/nginx/www.chlinux.net_access.log main;   #访问http://bbs.chlinux.net/message/***地址，反向代理message_server_pool这组服务器       location /message/ {        proxy_pass http://message_server_pool;        proxy_set_header Host $host;       }     #访问除了/message/之外的http://bbs.chlinux.net/***地址，反向代理php_server_pool这组服务器     location /message/ {        proxy_pass http://bbs_server_pool;        proxy_set_header Host $host;      proxy_set_header X-Forwarded-For $remote_addr;       }        }   #第三个虚拟主机     server {       listen    80;       server_name forum.chlinux.net;       access_log /var/log/nginx/www.chlinux.net_access.log main;       location / {            proxy_next_upstream http_502 http_504 error timeout invalid_header;        proxy_pass http://php_server_pool;        proxy_set_header Host www.chlinux.net;        proxy_set_header X-Forwarded-For $remote_addr;       }     }   }