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 < 34336, That is, the total number of concurrent connections is less than the total number of file handles that the system can open, which is within the range that the operating system can bear

# 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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