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[Chuck Short <chuck.short@xxxxxxxxxxxxx>]

** Changed in: nova (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/861504

Title:
  nova-compute-lxc limited by available nbd devices to 16 instances

Status in OpenStack Compute (Nova):
  Fix Released
Status in “nova” package in Ubuntu:
  Fix Released

Bug description:
  nova has 'FLAGS.max_nbd_devices' :
     flags.DEFINE_integer('max_nbd_devices', 16,
                       'maximum number of possible nbd devices')

  However, 
  a.) that doesn't really tell you why you care about this number, even though it effectively limits the number of lxc instances you can run at a single time, as each one uses a nbd device.
  b.) it does not modify in any way the number that the system can allocate.
     Ie, we would need to change the module parameter 'nbds_max' to nbd.ko.

  Perhaps nova-compute-lxc should install a file into /etc/modprobe.d that increases number, ie:
   # /etc/modprobe.d/nova-compute-lxc.conf
   options nbd  nbds_max=256

  And also set the FLAGS.max_nbd_devices in its nova-compute.conf.

  
  Note, one sucky thing, is that without killing or at least stopping all instances, you wouldn't be able to change the module parameter to increase this number.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: nova-compute-lxc 2011.3-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-12.19-server 3.0.4
  Uname: Linux 3.0.0-12-server x86_64
  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  Date: Wed Sep 28 11:14:28 2011
  NovaConf: Error: [Errno 13] Permission denied: '/etc/nova/nova.conf'
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: nova
  UpgradeStatus: No upgrade log present (probably fresh install)

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