CODEWITHSUNDEEP
powershelldocker
stevenmiller
stevenmiller

Reputation: 413

Docker rmi: Error response from daemon: invalid reference format: repository name must be lowercase

I am attempting to cleanup a (Windows) build server we use with our containers.

My goal is to periodically remove everything that isn't a base image, and I am doing this by filtering on our private registry name. I am running into this weird error when I try to use PowerShell for this:

PS C:\> docker images | Select-String "azurecr" | % { docker rmi $_ }
Error response from daemon: invalid reference format: repository name must be lowercase
Error response from daemon: invalid reference format: repository name must be lowercase
Error response from daemon: invalid reference format: repository name must be lowercase
Error response from daemon: invalid reference format: repository name must be lowercase
Error response from daemon: invalid reference format: repository name must be lowercase

Screenshot 1

Here is me just running the Select-String filter on its own, which returns the images without issue:

docker images | Select-String "azurecr"

Screenshot 2

Despite what the error states, there are no uppercase characters in the registry or image name.

Also not working:

PS C:\> (docker images) -like '*azurecr*' | % { docker rmi $_ }
Error response from daemon: invalid reference format: repository name must be lowercase
Error response from daemon: invalid reference format: repository name must be lowercase
Error response from daemon: invalid reference format: repository name must be lowercase

Upvotes: 0

Views: 3099

Answers (1)

Ansgar Wiechers
Ansgar Wiechers

Reputation: 200273

Use the -like operator for filtering the docker images output. Not only is it more lightweight than Select-String, but the latter also produces MatchInfo objects rather than passing just the matched strings through, which might cause undesired behavior. Also, you cannot just pass the full lines to docker rmi. The command expects an image ID, so you need to extract that from the string.

(docker images) -like '*azurecr*' | ForEach-Object {
    $id = ($_ -split '\s+')[2]
    docker rmi $id
}

Upvotes: 3

Related Questions