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Add tip about error message in registry cache (#3874)

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Jim Galasyn 2017-07-12 11:59:00 -07:00 committed by John Mulhausen
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docs/recipes/mirror.md
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@ -103,6 +103,11 @@ to make the change persistent.
Save the file and restart Docker for the change to take effect.
> **Tip**: If you see a message in the log that reads,
> `error statting local store, serving from upstream: unknown blob`, this isn't
> an error in cache functionality. Instead, it's an informational message
> telling you that the file doesn't exist yet in the local cache.
## Use case: the China registry mirror
The URL of the registry mirror for China is `registry.docker-cn.com`. You can