In this post, I want to show you something about a productivity trick on the server-side. I will discuss the systemd package on Linux systems. First of all, is a software package included in Linux operating systems. systemd It is created by the init process and takes 1 as the process id (PID). systemd services are started automatically and can be managed by root users. With the command, systemd services can be started ( ) and stopped ( ), applications that have changed configuration files can be re-read and restarted ( ), the status of the process can be obtained (status), and its activation can be controlled after the system restarts ( enable/disable). For more information, see the manual page. sytemctl start stop reload $ man systemctl is a very easy-to-use framework software for creating simple APIs. To add it to your script file, it is sufficient to download the flask module and include it on the page, and create an app object to create your routes. Then the script below can be used. Flask microframework pip3 import flask
app = flask.Flask(__name__)
app.config["DEBUG"] = True

@app.route('/', methods=['GET'])
def function_one():
return "<div style=\"   display: flex;justify-content: center;align-items: center;height: 100%;border: 3px solid green;  \" ><p>Hello sir, It seems to work properly.Here is<span style=\"font-size:50px; color:white; background-color:red\"> / </span></p> </div>"

@app.route('/users', methods=['GET'])
def function_two():
return "<div style=\"   display: flex;justify-content: center;align-items: center;height: 100%;border: 3px solid green;  \" ><p>Hello sir, It seems to work properly.Here is<span style=\"font-size:50px; color:white; background-color:green\"> /users</span> </p> </div>"

@app.route('/products', methods=['GET'])
def function_three():
return "<div style=\"   display: flex;justify-content: center;align-items: center;height: 100%;border: 3px solid green;  \" ><p>Hello sir, It seems to work properly.Here is<span style=\"font-size:50px; color:white; background-color:blue\"> /products </span></p> </div>"

app.run() By default, it starts working on the . To change port or host, you can give a new host and port with . localhost:5000 port app.run(host='ip_addr',port='port' ) After the script is saved as , it can be converted to a systemd service by writing the systemd service. app.py When a flask application is run with python, it is raised on the " ". There are different options for the API to be raised in the "Production" environment. You can learn from the Flask manual page. development server Check out flask  Deployment options Depending on the operating system, or  Let's open it in editor. This path may differ depending on the distro. To find out where other services are, e.g. for MariaDB service, sudo vi /lib/systemd/system/myFlaskApp.service nano $ locate mariadb If there is no output, use the command and try again. services can also be found under Or you can create such a directory under the directory. updatedb /usr/lib/systemd/system/… /usr Open the file and add the following lines /lib/systemd/system/myFlaskApp.service [Unit]
Description=My flask API service
[Install]
WantedBy=multi-user.target
[Service]
Type=simple
User=$USER
PermissionsStartOnly=true
ExecStart=/usr/bin/python3 /your/path/app.py
Restart=on-failure
TimeoutSec=600 Note: Here we set . This indicates that we only want it to restart when the exit code is not 0. We can also add and lines instead. It makes it reboot in any case. Restart=on-failure Restart=always RestartSec=1 You can add a config file with . sudo vi /etc/init/myFlaskApp.config description "MyFlaskApp"
start on stopped rc RUNLEVEL=[2345]
respawn
exec python3 /your/path/app.py Then, command following  command on Linux terminal. $ sudo systemctl start myFlaskApp You can start the service with this command. Make sure it is in the state with . active(running) systemctl status This method can be useful for developments made on the cloud service, but it is recommended to use the options above in terms of both performance and manageability in the production environment. deployment This service runs in the background without user intervention. It takes a as can be seen with . If a modular API structure is created and the route operation and other operations are isolated from each other, this method may be useful in situations where no modifications to this file are required. In this way, we can call it “life hacking”. pid sytemctl status First published here

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