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Add retry on image push 5xx errors - #2043
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Some registries can be flaky and return intermittent 5xx errors. This change allows those errors to be retried, similarly to network-level errors. Note that this needs the upstream containerd fix containerd/containerd#5276 to work reliably. This was tested with a registry that was modified to return 504 on every other manifest PUT. Without the change, exports to the registry fail every other attempt. With the change and the related containerd change, exports to the registry always succeed. Signed-off-by: Aaron Lehmann <alehmann@netflix.com>
aaronlehmann
commented
Mar 27, 2021
| images.ChildrenHandler(provider), | ||
| filterHandler, | ||
| retryhandler.New(remotes.FetchHandler(ingester, &localFetcher{provider}), nil), | ||
| retryhandler.New(remotes.FetchHandler(ingester, &localFetcher{provider}), func(_ []byte) {}), |
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Passing nil to retryhandler.New would cause panics if the retry handler tried to log something.
aaronlehmann
commented
Mar 27, 2021
| func LoggerFromContext(ctx context.Context) func([]byte) { | ||
| return func(dt []byte) { | ||
| pw, _, _ := progress.FromContext(ctx) | ||
| defer pw.Close() |
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I found that the client was getting "context cancelled" errors reading status if and only if the retry handler logged anything. It was a bit hard to track down the cause, but it looks like this missing Close kept the status stream open after the build was complete and led to a timeout.
tonistiigi
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Mar 29, 2021
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Some registries can be flaky and return intermittent 5xx errors. This
change allows those errors to be retried, similarly to network-level
errors.
Note that this needs the upstream containerd fix
containerd/containerd#5276 to work reliably.
This was tested with a registry that was modified to return 504 on every
other manifest PUT. Without the change, exports to the registry fail
every other attempt. With the change and the related containerd change,
exports to the registry always succeed.
Signed-off-by: Aaron Lehmann alehmann@netflix.com