nginx 做反向代理

1、Nginx的常用配置大家可以去搜一下，有很多优秀的博客，我这篇文章要实现的需求是：

　　a.根据访问的域名不同，跳转到不同的项目（html首页，80端口）

　　b.拦截访问中所有带有api的请求，转发到后端的不同服务器中（Tomcat项目，任意端口）

2、下面是Nginx的nginx.conf配置文件

user root root;
worker_processes  1;
#worker_cpu_affinity 1;
worker_rlimit_nofile 60000;
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

pid        /var/run/nginx.pid;


events {
    use epoll;
    worker_connections  60000;
}


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;
    client_max_body_size 50m;
    sendfile on;
    tcp_nopush on;
    keepalive_timeout 120;
    server_tokens off;
    tcp_nodelay on;

    #ws
#        map $http_upgrade $connection_upgrade {
#        default upgrade;
#        ''      close;
#    }
    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 Compression
    gzip on;
    gzip_buffers 16 8k;
    gzip_comp_level 6;
    gzip_http_version 1.1;
    gzip_min_length 256;
    gzip_proxied any;
    gzip_vary on;
    gzip_types
        text/xml application/xml application/atom+xml application/rss+xml application/xhtml+xml image/svg+xml
        text/javascript application/javascript application/x-javascript
        text/x-json application/json application/x-web-app-manifest+json
        text/css text/plain text/x-component
        font/opentype application/x-font-ttf application/vnd.ms-fontobject
        image/x-icon;
    gzip_disable  "msie6";

    #If you have a lot of static files to serve through Nginx then caching of the files' metadata (not the actual files' contents) can save 
some latency.
    open_file_cache max=1000 inactive=20s;
    open_file_cache_valid 30s;
    open_file_cache_min_uses 2;
    open_file_cache_errors on;



        access_log off;
        include vhost/*.conf;
}

所有自定义的配置 都在vhost文件夹下面

3、现在贴出两个vhost文件夹下面的自定义配置

server {
    listen 80;
    server_name dev.hr.static.baidu.com;

    location ~ .*.(gif|jpg|jpeg|png|bmp|swf|flv|ico|js|css|html|woff2|woff)$ {
        root /deploy/www/baidu-www/web-hr;
        add_header Access-Control-Allow-Origin *;
        add_header Access-Control-Allow-Headers X-Requested-With;
        add_header Access-Control-Allow-Methods GET,POST,OPTIONS;
    }
}

server {
    listen 80;
    server_name dev.am.static.baidu.com;

    location ~ .*.(gif|jpg|jpeg|png|bmp|swf|flv|ico|js|css|html|woff2|woff)$ {
        root /deploy/www/baidu-www/web-am;
        add_header Access-Control-Allow-Origin *;
        add_header Access-Control-Allow-Headers X-Requested-With;
        add_header Access-Control-Allow-Methods GET,POST,OPTIONS;
    }
}

这个是监听80端口，注意server_name，这个服务名跟你访问的host要一致才可以实现，如果你要进入到hr的首页，那么你在浏览器的输入是dev.hr.static.baidu.com，这样才能正常访问到你指定的页面

server {
        listen 80;
        server_name am.dev.baidu.com;
        access_log logs/am.baidu.com_nginx.log combined;
        index index.html index.jsp index.php;

location ^~ /api {
        proxy_pass  http://127.0.0.1:8081/;#需要代理的地址
        include proxy.conf;
        }

location ^~ / {
        root /deploy/www/baidu-www/web-am/;
        }
}

这个是需要转发的后端服务，这个路径后面可以带项目名，同样也需要注意server——name

下面是反向proxy.conf的配置

表示使nginx阻止HTTP应答代码为400或者更高的应答
#proxy_intercept_errors  on;
proxy_redirect          off;
#以下三行，目的是将代理服务器收到的用户的信息传到真实服务器上
#后端的Web服务器可以通过X-Forwarded-For获取用户真实IP
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Ssl on;
proxy_set_header Accept-Encoding '';
proxy_set_header Referer $http_referer;
proxy_set_header Cookie $http_cookie;

#允许客户端请求的最大单文件字节数
client_max_body_size 10m;
#缓冲区代理缓冲用户端请求的最大字节数
client_body_buffer_size 128k;
#nginx跟后端服务器连接超时时间(代理连接超时)
proxy_connect_timeout 300;
#连接成功后，后端服务器响应时间(代理接收超时)
proxy_read_timeout 900;
#设置代理服务器（nginx）保存用户头信息的缓冲区大小
proxy_buffer_size 32k;
#proxy_buffers缓冲区，网页平均在32k以下的话，这样设置
proxy_buffers 4 64k;
#高负荷下缓冲大小（proxy_buffers*2）
proxy_busy_buffers_size 128k;
#设定缓存文件夹大小，大于这个值，将从upstream服务器传
proxy_temp_file_write_size 64k;

proxy_send_timeout 900;

proxy_hide_header Vary;

最后附上Nginx的重启命令

进入到Nginx的安装目录下的sbin目录，执行./nginx -t 检查Nginx的配置文件是否正确；执行./nginx -s reload 重启服务