nginx 配置文件解析

#user  nobody;
#工作进程数，一般设置为cpu核心数
worker_processes  4;
worker_rlimit_nofile 65535;

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

#pid        logs/nginx.pid;


events {
    #==最大连接数，一般设置为cpu*2048
    worker_connections  2048;
}


http {
    #文件扩展名与文件类型映射表 
    include       mime.types;

    #默认文件类型  
    default_type  application/octet-stream;

    #开启高效文件传输模式
    sendfile        on;

    #长连接超时时间，单位是秒
    keepalive_timeout  60;

    #配置日志格式
    log_format  main  escape=json '{ "time": "$year-$month-$day $hour:$minutes:$seconds", '
		'"request_id": "$request_id",'
		'"request": "$request",'
		'"remote_addr": "$remote_addr",'
		'"costime": "$request_time",'
		'"realtime": "$upstream_response_time",'
		'"status": $status,'
		'"x_forwarded": "$http_x_forwarded_for",'
		'"referer": "$http_referer",'
		'"upstr_addr": "$upstream_addr",'
		'"bytes":$body_bytes_sent,'
		'"body": "$request_body",'
		'"agent": "$http_user_agent" },';

    access_log  logs/$year-$month-$day-$hour-access.log  main;

    #启用Gzip压缩
    #gzip on;
    #gzip_min_length 1k;
    #gzip_comp_level 9;
    #gzip_types text/plain application/javascript application/x-javascript text/css application/xml text/javascript application/x-httpd-php image/jpeg image/gif image/png;
    #gzip_vary on;
    #gzip_disable "MSIE [1-6]\.";

    #服务器的集群  
    #服务器集群名字，windows需要修改hosts文件 
    upstream  localhost {  
        #服务器配置   weight是权重的意思，权重越大，分配的概率越大。  
        server	  127.0.0.1:8446 weight=1;
        server	  127.0.0.1:8447 weight=1;
        server	  127.0.0.1:8448 weight=1;
    }

    #当配置多个server节点时，默认server names的缓存区大小就不够了，需要手动设置大一点
    server_names_hash_bucket_size 512;

    #server表示虚拟主机可以理解为一个站点，可以配置多个server节点搭建多个站点
    #每一个请求进来确定使用哪个server由server_name确定
    server {
        listen       8445;
        server_name  localhost;

        #编码格式，避免url参数乱码
        charset utf-8;

        if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})") {
            set $year $1;
            set $month $2;
            set $day $3;
            set $hour $4;
            set $minutes $5;
            set $seconds $6;
        }

        proxy_set_header request_id $request_id;

        #location用来匹配同一域名下多个URI的访问规则
        #比如动态资源如何跳转，静态资源如何跳转等
        #location后面跟着的/代表匹配规则
        location / {
            #站点根目录，可以是相对路径，也可以是绝对路径
            root   html;

            #默认主页
            index  index.html index.htm;

            #转发后端站点地址，一般用于做软负载，轮询后端服务器
            proxy_pass http://localhost;
            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-Proto   $scheme;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}