Analysis of example code for installing nginx under linux

The linux system is centos 64-bit

Introduction

##1. Common methods of installing software on Linux

1. rpm (or pkg) installation, similar to the windows installation program, is a precompiled program.

1. is compiled with general parameters, and the configuration parameters are not optimal

   
   

2. The controllability is not strong, such as Customized installation of program-specific components

   
   

3. Usually there are complex dependencies between installation packages and the operation is complicated

   
   

4. Simple installation , low error probability

   
   

2. yum (or apt-get) installation, improved version of rpm, automatically download the installation package online, and automatically manage dependencies

3. Compile and install (the method is not very different among various Linux distributions)

1. It is highly controllable, and the parameters can be optimized according to the current system environment during config , customizable components and installation parameters

   
   

2. Easily error-prone and slightly more difficult

2. nginx compilation and installation

1. Check and install dependencies

yum -y install gcc pcre pcre-devel zlib zlib-devel openssl openssl-devel

2. configure

3. make && make install

The detailed steps are as follows

The first step: Download the corresponding version from (or wget to download directly on Linux with the command)

The second step: Unzip tar -zxvf nginx-1.9.9 .tar.gz

The third step: Set the configuration information./configure --prefix=/usr/local/nginx, or do not perform this step and directly configure the default configuration

The fourth step :

make compile (the process of make is to turn source code files written in various languages ​​into executable files and various library files)

make install (make install is to compile these Copy the executable files and library files to the appropriate place)

When configuring the information, that is, in the third step, an error occurred:

The error is: ./configure : error: the http rewrite module requires the pcre library.

Install pcre-devel to solve the problem

yum -y install pcre-devel

There may also be:

Error message: ./ configure: error: the http cache module requires md5 functions

from openssl library. You can either disable the module by using
--without-http-cache option, or install the openssl library into the system,
or build the openssl library statically from the source with nginx by using
--with-http_ssl_module --with-openssl= options.

Solution:

yum -y install openssl openssl-devel

Installation Then start and shut down nginx under linux:

Start operation

/usr/local/nginx/sbin/nginx (/usr/local/nginx/sbin/nginx -t Check whether the configuration information is correct)

Stop operation

Stop the operation by sending a signal to the nginx process (please refer to the linux article for what a signal is) Performed

Step 1: Query the nginx main process number

ps -ef | grep nginx
Find the master process in the process list, and its number is the main process number.

Step 2: Send signal

Stop nginx gracefully:
kill -quit main process number
Quickly stop nginx:
kill -term main process number
Force Stop nginx:
pkill -9 nginx

In addition, if the pid file storage path is configured in nginx.conf, the file will store the nginx main process number. If not specified, it will be placed in the nginx logs directory. Down. With the pid file, we do not need to query the main process number of nginx first, but directly send a signal to nginx. The command is as follows:

kill -Signal type '/usr/local/nginx/logs/nginx.pid'

Smooth restart

If you change the configuration, you need to restart nginx. Do you need to close nginx first and then open it? No, you can send a signal to nginx to restart smoothly.

Smooth restart command:

kill -hup Enter the name or process number file path
Or use

/usr/local/nginx/sbin/nginx -s reload

Note, after modifying the configuration file, it is best to check whether the modified configuration file is correct to avoid nginx errors after restarting, which will affect the stable operation of the server. The command to determine whether

nginx configuration is correct is as follows:

nginx -t -c /usr/local/nginx/conf/nginx.conf

or

/usr/local/nginx/sbin/nginx -t

as shown below:

Come down and configure the environment variables

Add in /etc/profile:

export nginx_home=/usr/local/nginx

export path=path: path:nginx_home/sbin

Save,

Execute source /etc/profile to make the configuration file take effect.

Execute nginx -v, you can see the version, indicating that nginx is installed successfully

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