Docs don't explain how to manage insecure private registry

[Zeks]

Wanted to manage a registry attached to a running instance of microk8s. Couldn't figure out how to make any command work other than ls Everything else returned various errors.

For example:
reg tags http://192.168.1.59:32000/imagename produces "invalid reference format"
reg manifest -f -k 192.168.1.59:32000/imagename produces "missing signature key"
etc... without any information to help narrow down and resolve the problems reg apparently sees.

[Zeks]

I think I have figured it out, but error messages could explain what could be the problem in more detail probably. Problem is: someone who needs to figure it out for the first time has no idea what is the correct reference format or what "signature key" refers to

[Zeks]

May I suggest displaying valid command examples in the error message?

[ravingrhino]

What was the solution you found?