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How To Fix the CryptographyDeprecationWarning When Running Docker-Compose with Snap on Ubuntu

Ubuntu 16

In this article, we will guide you through the process of addressing the CryptographyDeprecationWarning that you may encounter when running docker-compose with Snap on Ubuntu. This warning typically appears due to Python 3.6 no longer being supported, which can cause issues for certain applications.

Quick Answer

To fix the CryptographyDeprecationWarning when running docker-compose with Snap on Ubuntu, you can try reinstalling docker-compose using pip or creating an alias to silence the warning. However, there is currently no official fix available, so it is recommended to monitor the official Docker documentation and the Docker snap GitHub repository for updates.

Understanding the Issue

When running docker-compose with the Docker snap on Ubuntu, you may encounter a warning message similar to the following:

/usr/lib/python3/dist-packages/secretstorage/dhcrypto.py:15: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
 from cryptography.utils import int_from_bytes
/usr/lib/python3/dist-packages/secretstorage/util.py:19: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
 from cryptography.utils import int_from_bytes

This warning is due to the fact that Python 3.6 is no longer being supported, and the cryptography module is using a function that has been deprecated.

Possible Solutions

There are a few possible solutions to this issue. We will outline them below.

Reinstalling docker-compose using pip

One possible solution is to reinstall docker-compose using pip, the Python package installer. This can be done with the following command:

pip install docker-compose

This command installs the docker-compose package using pip. However, this solution may not be applicable if pip is not available on your system.

Creating an Alias to Silence the Warning

Another solution is to create an alias to silence the warning. This can be done with the following command:

alias docker-compose="docker-compose 2>/dev/null"

This command creates an alias for docker-compose that redirects standard error (file descriptor 2) to /dev/null, effectively silencing the warning. However, this approach may hide other errors and is not a permanent fix.

Awaiting Official Updates

Unfortunately, there is currently no information available on how to fix the warning directly within the Docker snap. The best course of action at this time is to monitor the official Docker documentation and the Docker snap GitHub repository for any updates or announcements regarding this issue.

Conclusion

In this article, we have covered the CryptographyDeprecationWarning that may appear when running docker-compose with the Docker snap on Ubuntu. We have also outlined a few possible solutions to this issue. While there is currently no official fix for this warning, we recommend monitoring the official Docker documentation and the Docker snap GitHub repository for updates.

How can I check if Python 3.6 is installed on my Ubuntu system?

You can check if Python 3.6 is installed on your Ubuntu system by running the following command in your terminal: python3.6 --version. If Python 3.6 is installed, it will display the version number. If it is not installed, you will receive an error message.

Is it necessary to fix the `CryptographyDeprecationWarning` warning?

While the CryptographyDeprecationWarning warning can be ignored and the application may still function properly, it is generally recommended to address the warning. Ignoring the warning may lead to compatibility issues in the future as newer versions of Python and cryptography modules are released. It is best to keep your software up to date and resolve any deprecation warnings.

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