Hi There I m wondering exactly how the Prefect Docker Agent

Question

Hi There I m wondering exactly how the Prefect Docker Agent calls docker run I have a `CMD` in my dockerfile and it seems to not be executing That makes me think it is being overwritten Maybe I have to provide an `ENTRYPOINT` intead

Kevin Kho · Answer

The Docker Agent gets the image you supplied and adds commands on top to `prefect execute flow run` I think you want an entrypoint though

Leo Kacenjar · Answer

Ok that makes sense It would need to pass in flow details I hadn t thought about that Thanks

Kevin Kho · Answer

Wait what are you trying to do

Leo Kacenjar · Answer

I m trying to make sure a database is started

Leo Kacenjar · Answer

Which is proving to be challening

Leo Kacenjar · Answer

My dockerfile has a line like ```ENTRYPOINT sudo service mariadb start amp amp bash```

Leo Kacenjar · Answer

And that seems to be causing prefect cloud to hang

Leo Kacenjar · Answer

Locally that ensures the db is running and seems to work Is there a different way I should tackle that

Leo Kacenjar · Answer

Seems like that is usually handled in a `CMD` or `ENTRYPOINT` keyword

Kevin Kho · Answer

i believe ENTRYPOINTS should run but how about if you tried it as a system call inside the Flow

Leo Kacenjar · Answer

Ok I ll give it a shot

Anna Geller · Answer

There are many things you should examine 1 When you run `sudo` you re accessing a different Prefect home directory with different settings 2 Your Prefect Dockerfile should ideally use a Prefect base image and keep the entrypoint from there You should run your maria DB service in a separate container If you need an 3 The Docker agent itself should ideally rather than a container