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Fixing ‘Unit gunicorn.service not found’ Error in Ubuntu 18.04

Ubuntu 11

In the world of web server management, encountering errors is a common occurrence. One such error that Ubuntu 18.04 users may come across is the “Unit gunicorn.service not found” error. This error typically occurs when you’re trying to start the Gunicorn service on system startup using the command sudo systemctl enable gunicorn.service. This command is supposed to create a symlink to the service file in the directory /etc/systemd/system/multi-user.target.wants/. However, if the gunicorn.service file is not found, you’re likely to encounter this error.

In this article, we’ll take a detailed look at how to resolve this issue.

Quick Answer

To fix the "Unit gunicorn.service not found" error in Ubuntu 18.04, you need to first check if the gunicorn.service file exists. If it doesn’t, you’ll need to create it by following the recommended formatting from the Gunicorn documentation. After creating the file, enable the gunicorn.service and gunicorn.socket, and start the gunicorn.socket. Finally, check the status of the service to ensure it’s running properly.

Checking if the gunicorn.service File Exists

The first step in resolving this issue is to check whether the gunicorn.service file exists. To do this, run the following command:

ls -lF /etc/systemd/system/gunicorn.*

This command will list the files in the directory /etc/systemd/system/ that start with gunicorn.. If the gunicorn.service file is present, you should see two files: gunicorn.socket and gunicorn.service. If the gunicorn.service file is missing, you need to create it.

Creating the gunicorn.service File

To create the gunicorn.service file, run the following command:

sudo nano /etc/systemd/system/gunicorn.service

This command will open the nano text editor with sudo privileges, allowing you to create a new file named gunicorn.service in the /etc/systemd/system/ directory.

In this file, you need to paste the recommended formatting from the Gunicorn documentation or your own version. Ensure to replace SERVER_USER with the appropriate username and MAIN_PROJECT_FOLDER and MAINAPPLICATION_FOLDER with the correct paths.

Enabling the gunicorn.service

After creating the gunicorn.service file, you need to enable the service. To do this, run the following command:

sudo systemctl enable gunicorn.service

This command creates a symlink to the gunicorn.service file in the /etc/systemd/system/multi-user.target.wants/ directory. This tells systemd to start the Gunicorn service at boot.

Checking the Status of the Service

To ensure that the service is running properly, you can check its status using the following command:

systemctl status gunicorn.service

This command displays the status of the gunicorn.service, including whether it’s active, inactive, or failed, along with the most recent log entries.

Enabling and Starting the gunicorn.socket

In addition to the gunicorn.service, you also need to enable and start the gunicorn.socket. To do this, run the following commands:

sudo systemctl enable gunicorn.socket
sudo systemctl start gunicorn.socket

The first command enables the gunicorn.socket at boot, while the second command starts the socket immediately.

If you encounter the error message “Unit gunicorn.socket is not loaded properly: Invalid argument,” you can check the unit files with the following command:

systemctl list-unit-files | grep gunicorn

This command lists all unit files and filters the results for gunicorn. If the gunicorn.socket file is listed, it means that it’s loaded properly.

By following these steps, you should be able to resolve the “Unit gunicorn.service not found” error in Ubuntu 18.04. Remember that managing web servers requires a good understanding of the system, so always ensure to understand what each command does before running it.

What is Gunicorn?

Gunicorn (short for Green Unicorn) is a Python Web Server Gateway Interface (WSGI) HTTP server. It is commonly used to serve Python web applications.

How can I check if the gunicorn.service file exists?

To check if the gunicorn.service file exists, you can run the command ls -lF /etc/systemd/system/gunicorn.*. This command will list the files in the directory /etc/systemd/system/ that start with gunicorn.. If the gunicorn.service file is present, you should see two files: gunicorn.socket and gunicorn.service.

How can I create the gunicorn.service file?

To create the gunicorn.service file, you can use the command sudo nano /etc/systemd/system/gunicorn.service. This will open the nano text editor with sudo privileges, allowing you to create a new file named gunicorn.service in the /etc/systemd/system/ directory.

How can I enable the gunicorn.service?

After creating the gunicorn.service file, you can enable the service by running the command sudo systemctl enable gunicorn.service. This command creates a symlink to the gunicorn.service file in the /etc/systemd/system/multi-user.target.wants/ directory, enabling the Gunicorn service to start at boot.

How can I check the status of the gunicorn.service?

To check the status of the gunicorn.service, you can use the command systemctl status gunicorn.service. This command displays the current status of the service, including whether it is active, inactive, or failed, along with the most recent log entries.

Do I need to enable and start the gunicorn.socket as well?

Yes, in addition to the gunicorn.service, you also need to enable and start the gunicorn.socket. You can do this by running the commands sudo systemctl enable gunicorn.socket and sudo systemctl start gunicorn.socket respectively. The first command enables the gunicorn.socket at boot, while the second command starts the socket immediately.

How can I check if the gunicorn.socket is loaded properly?

To check if the gunicorn.socket is loaded properly, you can use the command systemctl list-unit-files | grep gunicorn. This command lists all unit files and filters the results for gunicorn. If the gunicorn.socket file is listed, it means that it is loaded properly.

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