nginx_负载均衡配置

2017-09-16
nginx 目前用的比较多了，官网 https://nginx.org/
nginx 常用命令

nginx 启动
nginx -c /etc/nginx/nginx.conf 指定配置文件启动
nginx -s stop 关闭
nginx -t 检测配置文件
nginx -s reload 重载配置文件
配置文件nginx.conf例子参考

   user  webuser;
#worker进程数，通常设置等同于CPU数量，auto为自动检测
worker_processes  auto;
#worker进程打开最大文件数，可CPU*10000设置
worker_rlimit_nofile 100000;
#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;
   #告诉nginx收到一个新链接通知后接受尽可能多的链接
    multi_accept on;
   #设置用于复用客户端线程的轮训方法
   use epoll;
}
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"';
   
    #设置nginx是否存储访问日志，关闭这个可以让读取磁盘IO操作更快
    #access_log  logs/access.log  main;
    #优化磁盘IO设置，指定nginx是否调用sendfile函数来输出文件，普通应用设为on，下载等磁盘IO高的应用，可设为off
    sendfile        off;
    #tcp_nopush     on;
    #keepalive_timeout  0;
    keepalive_timeout  30;
    #设置用户保存各种key的共享内存的参数，5m指的是5兆
    limit_conn_zone $binary_remote_addr zone=addr:5m;
    #为给定的key设置最大的连接数，这里的key是addr，设定的值是100，就是说允许每一个IP地址最多同时打开100个连接
    limit_conn addr 100;
    #gzip  on;
    #gzip_disable "MSIE [1-6]."; 
    #开发缓存的同时也指定了缓存文件的最大数量，20s如果文件没有请求则删除缓存
    open_file_cache max=100000 inactive=20s;
    #指多长时间检查一次缓存的有效信息
    open_file_cache_valid 60s;
    #文件缓存最小的访问次数，只有访问超过5次的才会被缓存
    open_file_cache_min_uses 5;
    #当搜索一个文件时是否缓存错误信息
    open_file_cache_errors on;
    #允许客户端请求的最大单文件字节数
    client_max_body_size 20m;
    #冲区代理缓冲用户端请求的最大字节数
    client_header_buffer_size 32k;
   
    upstream local_host{  
        #指定轮询权重，weight和访问比率成正比，用于后端服务器性能不均的情况。
        server 127.0.0.1:8181 weight=1;  
        server 127.0.0.1:8182 weight=1;   
        #每个请求按访问ip的hash结果分配，这样每个访客固定访问一个后端服务器，可以解决session的问题。
        #ip_hash;  
    }  
    server {
        listen       80;
        server_name  www.web.cn;
        charset UTF-8;
        #access_log  logs/host.access.log  main;
		#网站1
        location /myweb1/{
			#真实ip穿透
            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_pass http://www.web.cn:9001;
        }
        #网站2
        location /myweb2/{
           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_pass http://www.web.cn:9002;
        }
        #接口
        location /web/api{
           proxy_set_header Host $host;
           proxy_set_header X-Real-IP $remote_addr;
           proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		   #负载均衡
           proxy_pass http://local_host;
		   #关闭日志
           access_log off;
        }
        #静态图片
        location /bqms/static/api/ {
             root /home/webapps/image/;
             index  index.html index.htm;
             expires 90d;
             access_log off;
        }
        location  / {
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            root   html;
            index  index.html index.htm;
 
        }
        #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;
        }
        # 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;
    #    }
    #}
}
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