Hey team having some troubles running docker tasks in a dock

Question

Hey team having some troubles running docker tasks in a docker agent on windows dind

Brad · Answer

I m trying to mount the docker socket without any luck I ve tried basically every combination I can think of for ` volume var run docker sock`

Brad · Answer

Starting docker agent with `prefect agent docker start volume var run docker sock` then running a flow with some docker tasks

Brad · Answer

Errors are typically one of two issues ```docker errors APIError 500 Server Error for Internal Server Error b var run docker sock EXTRA string=is not a valid Windows path ``` or ```docker errors APIError 500 Server Error for Internal Server Error b mount denied nthe source path var run docker sock var run docker sock var run docker sock var run docker sock rw ntoo many colons ```

Anna Geller · Answer

This is hard I think < Kevin Kho> may help you later since he s been trying to do something with the docker sock recently Are you sure mounting the sock is necessary I think it would be much easier to start a local agent instead of a docker agent because then your Docker tasks will spin up everything as containers anyway and this way you can avoid running docker in docker and having to deal with the docker socket

Brad · Answer

Good point < Anna Geller> the reason for the docker agent is so I can palm off the run environment to my docker images

Kevin Kho · Answer

Uhh I cannot laughing This is hard So I can say based on <https github com PrefectHQ prefect issues 4947|this> archived issue that ` v var run docker sock var run docker sock` reportedly works That seems close to what you tried and I am just wondering if it s something to do with Windows here You are running Docker on Windows

Brad · Answer

yeah running docker on windpws

Kevin Kho · Answer

Yeah it really seems windows just doesn t like how the path is handled

Brad · Answer

According to various SO posts ` volume var run docker sock var run docker sock` should work

Brad · Answer

but then it fails the prefect volume parsing I believe just trying to rerun it again

Kevin Kho · Answer

Ah I see you mean on the agent I can understand if it fails on the agent code level after you set this

Brad · Answer

yep

Brad · Answer

so the error is this guy ```docker errors APIError 500 Server Error for <http+docker localnpipe v1 41 containers create name=awesome nyala> Internal Server Error b mount denied nthe source path var run docker sock var run docker sock var run docker sock var run docker sock rw ntoo many colons ```

Brad · Answer

if I try and run with just the host volume `prefect agent docker start volume var run docker sock` then I get ```<http+docker localnpipe v1 41 containers create name=mottled mole> Internal Server Error b var run docker sock EXTRA string=is not a valid Windows path ```

Kevin Kho · Answer

I think this would require changes to the Docker Agent code to get working

Brad · Answer

Yep sounds like it I ll raise an issue

Brad · Answer

Brad · Answer

Potential fix <https github com PrefectHQ prefect pull 5657 >

Kevin Kho · Answer

Nice We ll see what they say