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---
upgrade:
- |
The default for ``[glance] num_retries`` has changed from ``0`` to ``3``.
The option controls how many times to retry a Glance API call in response
to a HTTP connection failure. When deploying Glance behind HAproxy it is
possible for a response to arrive just after the HAproxy idle time. As a
result, an exception will be raised when the connection is closed resulting
in a failed request. By increasing the default value, Nova can be more
resilient to this scenario were HAproxy is misconfigured by retrying the
request.
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