Super-detailed analysis of Nginx configuration files – data organization

#Run user
 user nobody;
 #Start the process, usually set to be equal to the number of cpu
 worker_processes 1;

 #Global error log and PID file
 #error_log logs/error.log;
 #error_log logs/error.log notice;
 #error_log logs/error.log info;

 #pid logs/nginx.pid;

 #Working mode and connection limit
 events {
     #epoll is a way of multiplexing IO (I/O Multiplexing),
     #Only used for kernels above linux2.6, which can greatly improve the performance of nginx
     use epoll;

     #The maximum number of concurrent connections for a single background worker process
     worker_connections 1024;

     # The total number of concurrency is the product of worker_processes and worker_connections
     # ie max_clients = worker_processes * worker_connections
     # When reverse proxy is set, max_clients = worker_processes * worker_connections / 4 why
     # Why should the above reverse proxy be divided by 4, it should be said to be an experience value
     # According to the above conditions, the maximum number of connections that Nginx Server can handle under normal circumstances is: 4 * 8000 = 32000
     # The setting of worker_connections value is related to the size of physical memory
     # Because concurrency is bound by IO, the value of max_clients must be less than the maximum number of files that the system can open
     # The maximum number of files that the system can open is directly proportional to the memory size. Generally, the number of files that can be opened on a machine with 1GB of memory is about 100,000
     # Let's take a look at the number of file handles that a VPS with 360M memory can open:
     # $ cat /proc/sys/fs/file-max
     # output 34336
     # 32000 <34336, that is, the total number of concurrent connections is less than the total number of file handles that the system can open, so it is within the range that the operating system can bear
     # Therefore, the value of worker_connections needs to be set appropriately according to the number of worker_processes and the maximum total number of files that the system can open
     # Make the total number of concurrency less than the maximum number of files that the operating system can open
     # The essence is to configure according to the physical CPU and memory of the host
     # Of course, the theoretical total number of concurrency may deviate from the actual one, because the host has other working processes that need to consume system resources.
     # ulimit -SHn 65535

 }


 http {
     #Set the mime type, the type is defined by the mime.type file
     include mime.types;
     default_type application/octet-stream;
     #Set the log format
     log_format main '$remote_addr - $remote_user [$time_local] "$request"'
                       '$status $body_bytes_sent "$http_referer"'
                       '"$http_user_agent" "$http_x_forwarded_for"';

     access_log logs/access.log main;

     The #sendfile directive specifies whether nginx calls the sendfile function (zero copy mode) to output files,
     #For common applications, it must be set to on,
     #If it is used for downloading and other application disk IO heavy load applications, it can be set to off,
     #To balance the processing speed of disk and network I/O, reduce the uptime of the system.
     sendfile on;
     #tcp_nopush on;

     #Connection timeout
     #keepalive_timeout 0;
     keepalive_timeout 65;
     tcp_nodelay on;

     #Enable gzip compression
     gzip on;
     gzip_disable "MSIE [1-6].";

     #Set request buffer
     client_header_buffer_size 128k;
     large_client_header_buffers 4 128k;


     #Set virtual host configuration
     server {
         #Listen on port 80
         listen 80;
         #Define use www.nginx.cn to access
         server_name www.nginx.cn;

         #Define the server's default website root directory location
         root html;

         #Set the access log of this virtual host
         access_log logs/nginx.access.log main;

         #default request
         location / {
            
             #Define the name of the home page index file
             index index.php index.html index.htm;

         }

         # Define the error message page
         error_page 500 502 503 504 /50x.html;
         location = /50x.html {
         }

         #Static file, nginx handles it by itself
         location ~ ^/(images|Javascript|js|css|flash|media|static)/ {
            
             #Expires 30 days, static files are not updated very much, the expiration can be set larger,
             #If you update frequently, you can set it smaller.
             expires 30d;
         }

         #PHP script requests are all forwarded to FastCGI for processing. Use FastCGI default configuration.
         location~.php${
             fastcgi_pass 127.0.0.1:9000;
             fastcgi_index index.php;
             fastcgi_param SCRIPT_FILENAME $document_root $fastcgi_script_name;
             include fastcgi_params;
         }

         # Disable access to .htxxx files
             location ~/.ht {
             deny all;
         }

     }
 }