nova: dhcp_release command not found on RHEL6

[Sumit Sengupta]

nova-network log has error on RHEL6.x where it tries to execute dhcp_release command and fails. Do we have any setting which has to be disabled which should have been done during installation? I think this works on Ubuntu so is there any replacement for this command on RHEL6?

2012-03-30 08:56:16 ERROR nova.rpc.amqp [req-5a94ee87-fc3b-4d1b-a27c-e66991003f3a 6fc59f8248214624aec0d82556abe66f df42460ef5f74eb9bf5f12dedd6d08c1] Exception during message handling
(nova.rpc.amqp): TRACE: Traceback (most recent call last):
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/rpc/amqp.py", line 252, in _process_data
(nova.rpc.amqp): TRACE: rval = node_func(context=ctxt, **node_args)
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/network/manager.py", line 258, in wrapped
(nova.rpc.amqp): TRACE: return func(self, context, *args, **kwargs)
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/network/manager.py", line 372, in deallocate_for_instance
(nova.rpc.amqp): TRACE: super(FloatingIP, self).deallocate_for_instance(context, **kwargs)
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/network/manager.py", line 258, in wrapped
(nova.rpc.amqp): TRACE: return func(self, context, *args, **kwargs)
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/network/manager.py", line 927, in deallocate_for_instance
(nova.rpc.amqp): TRACE: **kwargs)
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/network/manager.py", line 248, in deallocate_fixed_ip
(nova.rpc.amqp): TRACE: address)
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/network/manager.py", line 1218, in deallocate_fixed_ip
(nova.rpc.amqp): TRACE: self.driver.release_dhcp(dev, address, vif['address'])
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/network/linux_net.py", line 634, in release_dhcp
(nova.rpc.amqp): TRACE: utils.execute('dhcp_release', dev, address, mac_address, run_as_root=True)
(nova.rpc.amqp): TRACE: File "/home/mymachine/openstack/nova/app/nova/utils.py", line 242, in execute
(nova.rpc.amqp): TRACE: cmd=' '.join(cmd))
(nova.rpc.amqp): TRACE: ProcessExecutionError: Unexpected error while running command.
(nova.rpc.amqp): TRACE: Command: sudo dhcp_release br100 10.0.0.2 fa:16:3e:76:b8:89
(nova.rpc.amqp): TRACE: Exit code: 1
(nova.rpc.amqp): TRACE: Stdout: ''
(nova.rpc.amqp): TRACE: Stderr: 'sudo: dhcp_release: command not found\n'
(nova.rpc.amqp): TRACE:

[yong sheng gong (gongysh)]

please see https://bugs.launchpad.net/nova/+bug/953712

[Sumit Sengupta (sumit-sngpt)]

Thanks for the link.

This looks like incorporated in Fedora latest release but not yet in RHEL6.x(https://bugzilla.redhat.com/show_bug.cgi?id=788485). At this point of time since its missing on RHEL, is it possible to disable "force_dhcp_release" option from Nova? I mean what would be the side affect, if any? Just curious.

Thanks!

[yong sheng gong (gongysh)]

force_dhcp_release=false

----------------------------------------------------------------------------------------------------------------------------------------
Yong Sheng Gong(龚永生)
Advisory Software Engineer
Cloud Development and Cloud Solution Integration
China Systems & Technology Lab
Mobile: [phone]
Skype: gong_ys2004
Email:<email address hidden>
Address: Ring Building, No. 28, ZhongGuanCun Software Park, No.8 Dong Bei
Wang West Road, Haidian District Beijing P.R.China 100193
地址: 北京市海淀区东北旺西路8号中关村软件园28号楼环宇大厦 邮政编码：100193

From: Sumit Sengupta <email address hidden>
To: Yong Sheng Gong/China/IBM@IBMCN
Date: 04/02/2012 03:16 PM
Subject: [Bug 970893] Re: nova: dhcp_release command not found on RHEL6
Sent by: <email address hidden>

Thanks for the link.

This looks like incorporated in Fedora latest release but not yet in
RHEL6.x(https://bugzilla.redhat.com/show_bug.cgi?id=788485). At this
point of time since its missing on RHEL, is it possible to disable
"force_dhcp_release" option from Nova? I mean what would be the side
affect, if any? Just curious.

Thanks!

** Bug watch added: Red Hat Bugzilla #788485
   https://bugzilla.redhat.com/show_bug.cgi?id=788485

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https://bugs.launchpad.net/bugs/970893

Title:
  nova: dhcp_release command not found on RHEL6

Status in OpenStack Compute (Nova):
  New

Bug description:
  nova-network log has error on RHEL6.x where it tries to execute
  dhcp_release command and fails. Do we have any setting which has to be
  disabled which should have been done during installation? I think this
  works on Ubuntu so is there any replacement for this command on RHEL6?

  2012-03-30 08:56:16 ERROR nova.rpc.amqp
[req-5a94ee87-fc3b-4d1b-a27c-e66991003f3a 6fc59f8248214624aec0d82556abe66f
df42460ef5f74eb9bf5f12dedd6d08c1] Exception during message handling
  (nova.rpc.amqp): TRACE: Traceback (most recent call last):
  (nova.rpc.amqp): TRACE: File
"/home/mymachine/openstack/nova/app/nova/rpc/amqp.py", line 252, in
_process_data
  (nova.rpc.amqp): TRACE: rval = node_func(context=ctxt, **node_args)
  (nova.rpc.amqp): TRACE: File
"/home/mymachine/openstack/nova/app/nova/network/manager.py", line 258, in
wrapped
  (nova.rpc.amqp): TRACE: return func(self, context, *args, **kwargs)
  (nova.rpc.amqp): TRACE: File
"/home/mymachine/openstack/nova/app/nova/network/manager.py", line 372, in
deallocate_for_instance
  (nova.rpc.amqp): TRACE: super(FloatingIP, self).deallocate_for_instance
(context, **kwargs)
  (nova.rpc.amqp): TRACE: File
"/home/mymachine/openstack/nova/app/nova/network/manager.py", line 258, in
wrapped
  (nova.rpc.amqp): TRACE: return func(self, context, *args, **kwargs)
  (nova.rpc.amqp): TRACE: File
"/home/mymachine/openstack/nova/app/nova/network/manager.py", line 927, in
deallocate_for_instance
  (nova.rpc.amqp): TRACE: **kwargs)
  (nova.rpc.amqp): TRACE: File
"/home/mymachine/openstack/nova/app/nova/network/manager.py", line 248, in
deallocate_fixed_ip
  (nova.rpc.amqp): TRACE: address)
  (nova.rpc.amqp): TRACE: File
"/home/mymachine/opens...

[Sumit Sengupta (sumit-sngpt)]

Since the command dhcp_release not yet available for RHEL so currently running nova with flag "force_dhcp_release=false" but not sure how it affect when I use multi-hosts system.

[Vish Ishaya (vishvananda)]

If force_dhcp_release is False, your ips will return to thepool after timeout after fixed_ip_disassocate_timeout seconds:

# fixed_ip_disassociate_timeout=600

currently set to 10 minutes. As long as you have a largish pool of fixed ips and you aren't launching and terminating too rapidly you should be fine.

[Russell Bryant (russellb)]

I marked this as "Invalid", but just because it's not a problem in nova. If you'd like to follow up on this becoming available in RHEL or EPEL, the Fedora Cloud SIG mailing list would be a good place to ask https://lists.fedoraproject.org/mailman/listinfo/cloud

[Xuecheng Li (lixuecheng8903)]

My BoolOpt to the force_dhcp_release is True,
On the RHEL6.3, I just install a tool named dnsmasq-utils
[root@controler nova]# rpm -ql dnsmasq-utils
/usr/bin/dhcp_lease_time
/usr/bin/dhcp_release
/usr/share/man/man1/dhcp_lease_time.1.gz
/usr/share/man/man1/dhcp_release.1.gz

Now the Command "dhcp_release" present . May be this can help you!

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/36660

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/36660
Committed: http://github.com/openstack/nova/commit/8c5d132f2f1e8bebd8f167b46d5155134bd6a78c
Submitter: Jenkins
Branch: master

commit 8c5d132f2f1e8bebd8f167b46d5155134bd6a78c
Author: Joe Gordon <email address hidden>
Date: Thu Jul 11 10:31:51 2013 +0100

    Change force_dhcp_release default to True

    Historically it was was false because it requires the dnsmasq binary
    'dhcp_release' which was not present in all distros.

    Related to bug 970893

    DocImpact

    Change-Id: I4975d85a66fb930d6a56900dd569cec2a1874439