Detailed explanation of nginx basic configuration and parameters

This article explains in detail the basic configuration and parameters of nginx

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;

#WorkingModeand maximum number of connections

events {

#epoll is a method of multiplexing IO (I/O Multiplexing),

#Only used for linux2.6 or above kernel, 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 concurrent connections is The product of worker_processes and worker_connections

# That is, max_clients = worker_processes * worker_connections

# When a 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 empirical 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 the worker_connections value is related to the physical memory size

# Because concurrency is restricted 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 can be opened by the system is 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 file handles that can be opened by a VPS with 360M of memory. What is the number:

# $ cat /proc/sys/fs/file-max

# Output 34336

# 32000

# Therefore, the value of worker_connections needs to be determined based on the number of worker_processes processes and the maximum total number of files that the system can open. Set it appropriately

# Make the total number of concurrencies 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 concurrencies may deviate from the actual number, 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 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;

#sendfile directive specifies whether nginx calls sendfile function (zero copy method ) to output files,

#For ordinary applications, it must be set to on,

#If it is used for disk IO heavy load applications such as downloading, it can be set to off,

#To balance the disk and network I/O processing speed, reduce the system uptime.

sendfile on;

#tcp_nopush on;

#Connection timeout time

#keepalive_timeout 0;

keepalive_timeout 65;

tcp_nodelay on;

#Turn on gzipCompression

gzip on;

gzip_disable "MSIE [1-6].";

#Set request buffer

client_header_buffer_size 128k;

large_client_header_buffers 4 128k;

#SettingsVirtual hostConfiguration

server {

#Listening port 80

            listen     80;

        #Define using www.nginx.cn to visit

                                                                                                                                                                    to    Define the default website root directory location of

service

root html;

#Set the access log of this virtual host

access_log logs/nginx. access.log main;

        #Default request

        location / {

                           . .php index.html index.htm;

} # Define the error 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)/ {

                                                            #Expired for 30 days, static files are not very updated, 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;

}

#No access to .htxxx files

Location ~ /.ht {

deny all;

}

}

}

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