[SOLVED] How to make alive nohup process?

Issue

I am using the nohup command with Python and Flask for background process. After I close the terminal it is working fine but after 1 or 2 days the process stops. Can someone tell me how to keep the background process running? I am using below command:

screen
space
nohup python -m flask run --cert local.crt --key local.key --host=0.0.0.0 --port=443 &
ctrl+a+d

Solution

Let's assume all your Flask code resides in the folder /home/abc_user/flask_app.

Steps

1. Create a file flask-server.service in /etc/systemd/system.

    [Unit]
    Description=Flask server
    After=network.target
   
    [Service]
    User=abc_user
    Group=abc_user
    WorkingDirectory=/home/abc_user/flask_app
    ExecStart=python -m flask run --cert local.crt --key local.key --host=0.0.0.0 --port=443
    Restart=always
   
    [Install]
    WantedBy=multi-user.target
   

2. Run sudo systemctl daemon-reload.

3. Start the service using systemctl start flask-server.service.

4. Check that it has started by systemctl status flask-server.service. Status should say "running".

5. If you want your flask server to auto-start after reboots, run systemctl enable flask-server.service

Some common operations

1. Check current status - systemctl status flask-server.service
2. Start the service - systemctl start flask-server.service
3. Stop the service - systemctl stop flask-server.service
4. Check logs - journalctl -u flask-server.service
5. Stream logs - journalctl -f -u flask-server.service
6. Check logs in past 1 hour - journalctl -u flask-server.service --since "1 hour ago"

Answered By - Amit Singh

Answer Checked By - Gilberto Lyons (WPSolving Admin)