A brief introduction to nginx configuration and parameters

Summary: nginx basic configuration and parameter description

#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 maximum number of connections
events {
#epoll It is a method of multiplexing IO (I/O Multiplexing).
# It is only used for linux2.6 and above kernels. It 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
# After setting the reverse In the case of proxy, max_clients = worker_processes * worker_connections / 4 Why
# Why should the reverse proxy above be divided by 4? It should be said to be an empirical value
# According to the above conditions, Nginx Server can handle it under normal circumstances The maximum number of connections is: 4 * 8000 = 32000
# The setting of the worker_connections value is related to the physical memory size
# Because concurrency is subject to IO constraints, the value of max_clients must be less than the maximum number of files that the system can open
# And 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 number of file handles that can be opened by a VPS with 360M of memory:
# $ 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 that when the operating system can Within the acceptable range
# Therefore, the value of worker_connections needs to be set appropriately based on the number of worker_processes processes and the maximum total number of files that the system can open
# so that the total number of concurrent concurrencies is 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 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;

#The sendfile instruction specifies whether nginx calls the sendfile function (zero copy mode) to output the file.
#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 and reduce the system uptime.
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 to port 80
listen 80;
#Define using www.nginx.cn to access
server_name www.nginx.cn;

#Define the default of the server 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 homepage index file
index index.php index.html index.htm;

}

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

#Static files, nginx handles them by itself
location ~ ^/(images|javascript| js|css|flash|media|static)/ {

#Expiration is 30 days, static files are not updated very much, the expiration can be set larger,
#If it is updated frequently, it can be set 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;
}

#Access to .htxxx files is prohibited
location ~ /.ht {
deny all;
}

}
}

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