Error resolving own hostname when using Docker Compose

[danfarinoeyecue]

We are using a Docker Compose based Codespace and are occasionally getting errors like unable to resolve host 7430bc41-1f8a-4586-bb06-50ee2022cf07: Temporary failure in name resolution.

It looks like Codespaces is telling Docker to set the hostname and to add a /etc/hosts entry for that hostname. I see this in the file /workspaces/.codespaces/shared/merged_devcontainer.json, in the runArgs section:

"--hostname",
 "codespaces_1fdb40",
 "--add-host",
 "codespaces_1fdb40:127.0.0.1",

This issue seems to say that runArgs is not used for Docker Compose devcontainer workspaces.

This is not a blocker for us: I added a hard-coded hostname to the first service in my docker-compose.yml file, and added echo "127.0.0.1 $(hostname)" | sudo tee -a /etc/hosts to a script that is run by postStartCommand in devcontainer.json.

If there is a more conventional way to solve this, please let me know. Thanks!