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 # 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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