yahoo-eng-team team mailing list archive

[Marc Koderer <marc@xxxxxxxxxxx>]

Public bug reported:

Description:
============
Due to overload situation in our storage one NFS mount went into stale mode.
All other mount points where accessible and working.
Deletion of a VM on this hypervisor was not possible since nova-compute wasn't reactive.

The agent was flagged as: 
> nova-manage service list
nova-compute   de4-2e-ff-0d-44-a4    nova    enabled    XXX   2017-05-16 11:49:00.577943

The nova-compute services scans over all attached volume paths (ephemeral and cinder).
In case of a single stale NFS mount will pause the whole agent.
With an inactive agent no operation are possible, even VM deletion. 

Steps to reproduce:
===================

1.) Boot a VM
2.) Attach a volume
3.) Make the NFS backend inaccessible (e.g. using a drop iptable rule)

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1691131

Title:
  NFS stale causes nova compute agent outage

Status in OpenStack Compute (nova):
  New

Bug description:
  Description:
  ============
  Due to overload situation in our storage one NFS mount went into stale mode.
  All other mount points where accessible and working.
  Deletion of a VM on this hypervisor was not possible since nova-compute wasn't reactive.

  The agent was flagged as: 
  > nova-manage service list
  nova-compute   de4-2e-ff-0d-44-a4    nova    enabled    XXX   2017-05-16 11:49:00.577943

  The nova-compute services scans over all attached volume paths (ephemeral and cinder).
  In case of a single stale NFS mount will pause the whole agent.
  With an inactive agent no operation are possible, even VM deletion. 

  Steps to reproduce:
  ===================

  1.) Boot a VM
  2.) Attach a volume
  3.) Make the NFS backend inaccessible (e.g. using a drop iptable rule)

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