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What could be causing the Docker image to fail to run, with the error message "django.db.utils.OperationalError could not translate host name 'postgres' to address: Name or service not known"?

asked 2023-01-28 11:00:00 +0000

djk gravatar image

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answered 2022-12-22 23:00:00 +0000

bukephalos gravatar image

The error message indicates that the Django app is unable to connect to the Postgres database because the hostname 'postgres' cannot be resolved to an IP address. This can be caused by several factors:

  1. The Postgres container is not running or not properly configured.
  2. The hostname 'postgres' is not defined in the Docker network or DNS resolver.
  3. The Django app is looking for the Postgres container on the wrong Docker network.
  4. There is a typo in the Docker Compose file, such as a misspelled container name or network name.
  5. The Docker network is not properly configured to allow communication between containers.

To resolve the issue, try the following steps:

  1. Ensure that the Postgres container is running and properly configured.
  2. Check that the hostname 'postgres' is defined in the Docker network by running the command "docker network inspect <network_name>". If it is not defined, add it to the "hosts" section of the Docker Compose file.
  3. Check that the Django app is looking for the Postgres container on the same Docker network by checking the "networks" section of the Docker Compose file.
  4. Double-check the Docker Compose file for typos in container and network names.
  5. Confirm that the Docker network is properly set up to allow communication between containers.
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Asked: 2023-01-28 11:00:00 +0000

Seen: 8 times

Last updated: Dec 22 '22