ironic/releasenotes/notes/persist-redfish-sessions-d521a0846fa45c40.yaml
Ilya Etingof 8a64d03dc0 Reuse Redfish sessions
Fixes redfish hardware type to cache and reuse `Sushy` objects
when talking to BMC. Prior to this fix redfish hardware type
never reused authenticated HTTP sessions (tokens) e.g. effectively
created new HTTP session on every BMC call. That may have led
sometimes to session pool exhaustion with some BMC implementations.

To properly terminate authenticated session, sushy has to make
an explicit DELETE call against BMC Redfish Session API. As of this
commit, sushy does not do that so that ironic could still exhaust
BMC sessions. However, the likelihood of running out of BMC sessions
seems to be lower with this fix considering lesser frequency of
new sessions creation.

The proper fix would be to make sushy terminating authenticated
session with BMC on `Sushy` object deallocation.

Change-Id: I18ea013fd6e07c98b8c47d95772d3129132cdc53
Story: 2003813
Task: 26566
2018-10-26 16:20:45 +02:00

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YAML

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fixes:
- |
Fixes ``redfish`` hardware type to reuse HTTP session tokens when
talking to BMC using session authentication. Prior to this fix ``redfish``
hardware type never tried to reuse session token given out by BMC during
previous connection what may sometimes lead to session pool exhaustion
with some BMC implementations.