Add tip about error message in registry cache (#3874)
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@ -103,6 +103,11 @@ to make the change persistent.
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Save the file and restart Docker for the change to take effect.
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> **Tip**: If you see a message in the log that reads,
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> `error statting local store, serving from upstream: unknown blob`, this isn't
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> an error in cache functionality. Instead, it's an informational message
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> telling you that the file doesn't exist yet in the local cache.
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## Use case: the China registry mirror
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The URL of the registry mirror for China is `registry.docker-cn.com`. You can
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