Deploy the library management system project

Deployment preparation

To deploy a book management project you will use the following software

• nginx
• uWSGI
• CentOS7
• Deploying the Book Management Project File
• virtualenv
• supervisor

WEDNESDAY

Python web server development uses WSGI protocol (Web Server Gateway Interface)

The python web project will generate a wsgi.py file by default to determine the application module.

uWSGI is used in the production environment, which implements all the interfaces of WSGI, and is written in C language, which is a very efficient web server.

uWSGI is a full-featured HTTP server that implements WSGI protocol, uwsgi protocol, http protocol, etc. All it has to do is convert the HTTP protocol into a network protocol supported by the language. For example, the HTTP protocol is converted into the WSGI protocol, so that Python can use it directly.

Nginx

Nginx is used for its reverse proxy function, and the project will be deployed online through Django+uWSGI+Nginx.

CentOS

1. Package the project CRM folder and compress the file

2. Upload files to Centos server through xftp, scp, lrzsz, etc.

Linux usage tips

1. Use software such as xshell or iTerm to operate your linxu with multiple terminals, so that when debugging uwsgi, nginx, and project code, you can avoid switching directories back and forth and improve work efficiency.

2. Note that the configuration file of the linux software has been modified, and the service must be restarted to take effect.

Virtualenv

Build a clean, isolated python interpreter environment to prevent software dependencies, conflicts and other issues, it is recommended to use.

Supervisor

Supervisor (http://supervisord.org/) is a client/server service developed in Python. It is a process management tool under Linux/Unix systems and does not support Windows systems. It can easily monitor, start, stop, and restart one or more processes. For a process managed by Supervisor, when a process is accidentally killed, supervisort will automatically restart the process after monitoring the death of the process.

start deployment

1. Familiar with linux operation

Linux basic command operations, omit.....

2. Installation of python3 interpreter

Reference blog: https://www.cnblogs.com/tiger666/articles/10312522.html

3. Configuration of virtualenvwrapper tool to solve virtual environment problems

#Confirm the virtualenvwrapper configuration in the ~/.bashrc configuration file 
WORKON_HOME=~/ Envs
VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--no-site-packages'
VIRTUALENVWRAPPER_PYTHON=/opt/python36/bin/python3
source /opt/python36/bin/virtualenvwrapper.sh

#Create and activate a virtual environment for the book management system project 
mkvirtualenv book_manage_env

4. Install and configure the MariaDB database, create database data, and migrate the data imported into the library management system

(1) Install and start the MariaDB database

Under CentOS7, MariaDB is the mysql database, but the package name is different

#Use yum to download and install mariadb 
yum install MariaDB-server MariaDB-client - y

#Start mariadb server 
systemctl start mysql

(2) Connect and authorize root user remote access

#Use the client to link the mysql server 
mysql -uroot -p log in to mariadb on linux

#Note 1, linux database, you need to set remote link permissions for the root user, the password is qishi3q 
grant all privileges on *.* to root@ ' % ' identified by ' qishi3q ' ;
 #Authorize all permissions, in all libraries, All tables are for the root user on all hosts, and the set permission password is qishi3q #Refresh 
the authorization table 
flush privileges;

Note 2, linux firewall and selinux should be closed, otherwise windows to link linux port 3306 may be rejected

(3) Import the data of the library management project

On the linux server, mysql, import the data of the library management system

# 1. The export and import of mysql data 
This command is typed in linux/ windows
mysqldump -u root -p --all-databases >  book_manage.dump  

# 2. Upload this data file to the linux database

# 3. In mysql of linux, import this data file (you need to specify the database in the dump file: use szday58) 
mysql -u root -p < /opt/ book_manage.dump #Or
 enter mysql to enter the database, use the command: 
source / opt/book_manage.dump

5. Enter the virtual environment and run the project

The test uses linux's python interpreter to run the project and switch to running in the project (note that the module problem of the interpreter must be solved to run the project normally)

# 127.0.0.1 can't be used, it can only be accessed locally. If everyone can access it, you must use 0.0.0.0 
python3 manage.py runserver 0.0.0.0:8000

Then you can access it through IP plus port. If this IP is my cloud server IP, then when we go to the interview, we can take this project and show it to the interviewer on the computer. It’s so compelling~

Easter egg : Now there is a problem. We can only access the project through 10.0.0.7:8000, but this is not the case for websites on the public Internet . For example, Luffy Academy is accessed through a domain name. We can also resolve the Luffy Academy. The website server IP can also be accessed through the address, but the port is not added later, because the default is to use port 80

Although we can directly change the port to 80, there is no problem, then the problem is: 

1 django uses the wsgiref stand-alone module by default to run the web interface, and the performance will be relatively low. How to solve it?

uwsgi + django + nginx

2 What should we do if we want to run another project to provide external services? The server has only one port 80, how to solve it

nginx + uwsgi + django + supervisor

-Complete the installation and configuration of nginx, understand how to configure nginx.conf

-Complete the uWSGI command learning, use uWSGI to start the knight project, support multi-process

-Complete nginx to process the static files of the book management project

-Final effect

Visit port 80 of nginx and you can find it Book management page, and ensure that the static file page is normal