WARNING: new settings may not be used until builder is restarted

mcandre · February 13, 2025, 9:05pm

Why am I now seeing this annoying warning message every time I use buildx to create images?

WARNING: new settings may not be used until builder is restarted

What “new settings” are being used?

I stopped (there is no restart command) the builder. No change in behavior.

Restarted the Docker daemon. No change in behavior.

Pruned Docker. No change in behavior.

Example project:

meyay · February 14, 2025, 7:57am

If you feel this is a bug, you can raise an issue in the BuildKit GItHub repository: https://github.com/moby/buildkit/issues

rimelek · February 14, 2025, 8:41am

The error message is thrown by buildx

But the warning is in a function called “update”

github.com/docker/buildx

store/nodegroup.go

ef73c64d2


      
          			n.DriverOpts = do
          			needsRestart = true
          		}
          		if buildkitdConfigFile != "" {
          			for k, v := range files {
          				n.Files[k] = v
          			}
          			needsRestart = true
          		}
          		if needsRestart {
          			logrus.Warn("new settings may not be used until builder is restarted")
          		}
          
          		ng.Nodes[i] = n
          		return ng.validateDuplicates(endpoint, i)
          	}
          
          	if name == "" {
          		name = ng.nextNodeName()
          	}

So if the build process itself updates anything, it might not be a bug. And it would explain why restarting the builder doesn’t help.

mcandre · February 14, 2025, 3:39pm

Dunno if bug.

The phrasing of the message is confusing. I have no idea what action is expected of the user. All attempts to restart the builder have no effect.

rimelek · February 14, 2025, 9:04pm

What is the command you run before you see the warning?

system · February 24, 2025, 9:05pm

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WARNING: new settings may not be used until builder is restarted

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