Docker agent cannot communicate with a Prefect Server Postgres database instance running locally on a host VM

[anna_geller]

If all of the above explanations didn’t help, please share:

• how did you define your Server start-up command,
• your Docker agent full startup command,
• and your flow definition (incl. your DockerRun) so that I can try to reproduce it.

Also note that the Docker agent itself shouldn’t be created within a container, but rather a local process:

Can I run a Docker agent in a container?

In general, the Docker agent is supposed to run in a local process (rather than in a docker container), and this local process is a layer between Prefect backend and a Docker Daemon. This agent polls the API for new flow runs, and if there are new scheduled runs, it then creates new flow runs and deploys those as Docker containers on the same machine as the agent. When the Docker agent is running within a container itself (rather than a local process), your flow runs end up deployed as contain…