Update garbage-collection.md#24312
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Using the filter suggested by the docs causing error in Docker 29.2.1 preventing GC from working. Appending double equals (==) fix the problem. Mar 09 14:39:58 gitRunner04 dockerd[1238772]: time="2026-03-09T14:39:58.005793998+07:00" level=error msg="gc error: filters: parse error: [type==source.local,type >|=|< exec.cachemount,type=source.git.checkout]: unsupported operator \"=\": invalid argument\nfailed to parse prune filters [type==source.local,type=exec.cachemount,type=source.git.checkout]\ngithub.com/moby/buildkit/cache.(*cacheManager).prune\n\t/root/rpmbuild/BUILD/src/engine/vendor/github.com/moby/buildkit/cache/manager.go:1039\ngithub.com/moby/buildkit/cache.(*cacheManager).Prune\n\t/root/rpmbuild/BUILD/src/engine/vendor/github.com/moby/buildkit/cache/manager.go:1019\ngithub.com/moby/buildkit/worker/base.(*Worker).Prune\n\t/root/rpmbuild/BUILD/src/engine/vendor/github.com/moby/buildkit/worker/base/worker.go:507\ngithub.com/moby/buildkit/control.(*Controller).gc.func2\n\t/root/rpmbuild/BUILD/src/engine/vendor/github.com/moby/buildkit/control/control.go:656\ngolang.org/x/sync/errgroup.(*Group).Go.func1\n\t/root/rpmbuild/BUILD/src/engine/vendor/golang.org/x/sync/errgroup/errgroup.go:93\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1693"
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Did you set this policy in daemon.json or buildkitd.toml? The format for these filter opts is, confusingly, slightly different. Daemon.json uses a single This particular example is just meant to show what the gc policies resolve to in the daemon.json format, for the default builder GC configuration in Docker Desktop. |
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I set the policy in the On mine I ended up using mixed sign like below to get the garbage collection running, Maybe the root cause happen somewhere inside the docker's code, but in the mean time it's necessary to update the docs so people know how to make the garbage collection working. |
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Using the filter suggested by the docs causing error in Docker 29.2.1 preventing GC from working.
Docs: https://docs.docker.com/build/cache/garbage-collection/#docker-daemon-configuration-file
Solution:
type=source.local,type==exec.cachemount,type==source.git.checkoutRelated error log:
Mar 09 14:39:58 gitRunner04 dockerd[1238772]: time="2026-03-09T14:39:58.005793998+07:00" level=error msg="gc error: filters: parse error: [type==source.local,type >|=|< exec.cachemount,type=source.git.checkout]: unsupported operator "=": invalid argument\nfailed to parse prune filters [type==source.local,type=exec.cachemount,type=source.git.checkout]\ngithub.com/moby/buildkit/cache.(*cacheManager).prune\n\t/root/rpmbuild/BUILD/src/engine/vendor/github.com/moby/buildkit/cache/manager.go:1039\ngithub.com/moby/buildkit/cache.(*cacheManager).Prune\n\t/root/rpmbuild/BUILD/src/engine/vendor/github.com/moby/buildkit/cache/manager.go:1019\ngithub.com/moby/buildkit/worker/base.(*Worker).Prune\n\t/root/rpmbuild/BUILD/src/engine/vendor/github.com/moby/buildkit/worker/base/worker.go:507\ngithub.com/moby/buildkit/control.(*Controller).gc.func2\n\t/root/rpmbuild/BUILD/src/engine/vendor/github.com/moby/buildkit/control/control.go:656\ngolang.org/x/sync/errgroup.(*Group).Go.func1\n\t/root/rpmbuild/BUILD/src/engine/vendor/golang.org/x/sync/errgroup/errgroup.go:93\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1693"
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