nginx负载均衡配置

 

nginx.conf

user  www www;

worker_processes 1;

error_log  /home/wwwlogs/nginx_error.log  crit;

pid        /usr/local/nginx/logs/nginx.pid;

#Specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 51200;

events
    {
        use epoll;
        worker_connections 51200;
    }

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 60;

        tcp_nodelay on;

        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 256k;

        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;

        #limit_zone  crawler  $binary_remote_addr  10m;
        upstream webapp.dev {
            server 182.92.165.121:8080;
        }
server
    {
        listen       80;
        server_name www.dearho.com;
        index index.html index.htm index.php;
        root  /home/wwwroot;

        
        location /   
        {   
            proxy_next_upstream http_502 http_504 error timeout invalid_header;   
            proxy_redirect          off;
            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://webapp.dev;   

        }
        location /status {
            stub_status on;
            access_log   off;
        }
        
        
        
    }
include vhost/*.conf;
}

 

 

一、负载均衡不是nginx独有，著名鼎鼎的apache也有，但性能可能不如nginx。

二、多台服务器提供服务，但域名只解析到主服务器，而真正的服务器IP不会被ping下即可获得，增加一定安全性。

 

三、upstream里的IP不一定是内网，外网IP也可以。不过经典的案例是，局域网中某台IP暴露在外网下，域名直接解析到此IP。然后又这台主服务器转发到内网服务器IP中。

四、某台服务器宕机、不会影响网站正常运行，Nginx不会把请求转发到已宕机的IP上