Explanation of Nginx. conf parameters in Nginx

# Which user is used to start nginx before the user is followed by the group
User www;

# Number of processes that nginx is working on
Worker_processes 2;

# [Debug | info | notice | warn | error | crit] location of the error log
Error_log/var/htdocs/logs/nginx_error.log crit;

# Process number saving file
Pid/usr/local/nginx. pid;
# Maximum file descriptor? To be further organized.
Worker_rlimit_nofile 51200;

Events
{
# Use [kqueue | rtsig | epoll |/dev/poll | select | poll];
Use epoll; # use epoll (linux2.6 high-performance mode)
Worker_connections 51200; # maximum number of connections of each process (maximum connection = number of connections x number of processes)
}

Http
{
# File extension and file type ing table
Include mime. types;

# Default file type
Default_type application/octet-stream;

# Log file format
Log_format main '$ remote_addr-$ remote_user [$ time_local] $ request'
'"$ Status" $ body_bytes_sent "$ http_referer "'
'"$ Http_user_agent" "$ http_x_forwarded_for "';

Log_format download '$ remote_addr-$ remote_user [$ time_local]'
'"$ Request" $ status $ bytes_sent'
'"$ Http_referer" "$ http_user_agent "'
'"$ Http_range" "$ sent_http_content_range "';

# Default encoding
Charset gb2312, UTF-8;

Server_names_hash_bucket_size 128;
# Enable the efficient file transfer mode
Sendfile on;
# The following two options are used to prevent network congestion www.111cn.net reference http:// I .cn.yahoo.com/nesta2001zhang/blog/p_104/
Tcp_nopush on;
Tcp_nodelay on;

# Long link timeout
Keepalive_timeout 300;

# Fastcgi connection timeout time. The following can be understood literally, so I will not explain it.
Fastcgi_connect_timeout 300;
Fastcgi_send_timeout 300;
Fastcgi_read_timeout 300;
Fastcgi_buffer_size 128 k;
Fastcgi_buffers' 4 256 k;
Fastcgi_busy_buffers_size 256 k;
Fastcgi_temp_file_write_size 256 k;
Fastcgi_temp_path/dev/shm;

# Enable gzip compression
Gzip on;
# Minimum compressed file size
Gzip_min_length 1 k;
# Compression buffer
Gzip_buffers 4 8 k;
# Compressed version (1.1 by default, 1.0 is used for the front-end squid2.5)
Gzip_http_version 1.1;
# Compression type. text/html is already included by default, so you don't need to write any more below. Of course, if you write it, there will be no problem, but there will be a warn
Gzip_types text/plain application/x-javascript text/css text/html text/javascript application/xml;
# Error page
Error_page 404 http://www.111cn.net;
Error_page 403 http://111cn.net;
# Size limit of uploaded files
Client_max_body_size 20 m;
# Set request delay
Client_header_buffer_size 16 k;
Large_client_header_buffers 4 64 k;
# Set the server list of server load balancer
# If four independent php-cgi processes (eight sub-processes in each group) are initiated on the same machine ), the performance should be inferior to that of one group of php-cgi processes (32 sub-processes). Because of one group of processes, the PHP binary file cache of eaccelerator is shared, and the hit rate of one group of processes is high.
# But the advantage is that if a group of php is suspended, other ports can be taken over. It seems that the probability of a 502 error has been greatly reduced, or I haven't met
Upstream mysvr {
# The weigth parameter indicates the weight. A higher weight indicates a higher probability of being assigned.
# Enable port 3128 for Squid on the local machine
Server 192.168.8.1: 3128 weight = 5;
Server 192.168.8.2: 80 weight = 1;
Server 192.168.8.3: 80 weight = 6;
}
# Configure the VM below
Server
{
Listen 80;
Server_name www.52crack.com;
Index index.html Index.html index.htm index. php;
Root/var/htdocs/52 crack;
If (-d $ request_filename)
{
Rewrite ^/(. *) ([^/]) $ http: // $ host/$1 $2/permanent;
}
# Set access logs for the current virtual host
Access_log logs/www.52crack.com. access. log main;

Location ~ . *. Php? $
{
Fcinclude GI. conf;
Fastcgi_pass 127.0.0.1: 9000;
Fastcgi_index index. php;
}
# If you access/img/*,/js/*,/css/* resources, you can directly retrieve the local file without passing squid
# This method is not recommended if there are many files, because the squid cache works better.
Location ~ ^/(Img | js | css )/{
Root/var/htdocs/52 crack;
Expires 24 h;
}

# Enable server load balancer "/"
Location /{
Proxy_pass http: // 127.0.0.1;
Proxy_redirect off;
Proxy_set_header Host $ host;
Proxy_set_header X-Real-IP $ remote_addr;
Proxy_set_header X-Forwarded-For $ proxy_add_x_forwarded_for;
Client_max_body_size 10 m;
Client_body_buffer_size 128 k;
Proxy_connect_timeout 90;
Proxy_send_timeout 90;
Proxy_read_timeout 90;
Proxy_buffer_size 4 k;
Proxy_buffers 4 32 k;
Proxy_busy_buffers_size 64 k;

Proxy_temp_file_write_size 64 k;
}

# Set the address for viewing Nginx status
Location/NginxStatus {
Stub_status on;
Access_log on;
Auth_basic "NginxStatus ";
Auth_basic_user_file conf/htpasswd;
}
}
}
# Why do we need to configure kernel. shmmax to 134217728?
# Is it not possible by default? How did you calculate this number?
# Zhang banquet reply
# Because eaccelerator. shm_size = "128 & Prime; is configured in php. ini, the shared memory size that eaccelerator can use is 128 MB.
#134217728 bytes/1024/1024 = 128 MB
# In Linux, the maximum memory usage of a single process is limited by the number (in bytes) set in/proc/sys/kernel/shmmax ), for example, the shmmax value of CentOS and Redhat is 33554432 bytes (33554432 bytes/1024/1024 = 32 MB) by default ).
# Temporarily change the value:
# Echo bytes>/proc/sys/kernel/shmmax
# The value is automatically restored every time the system is restarted. If you want to change it permanently, you can modify the/etc/sysctl. conf file and set it:
# Kernel. shmmax = number of bytes
# If your eaccelerator uses the default 32 m shared memory, you can leave this value unchanged.