Ask Your Question

Alen Komljen's profile - activity

2016-01-28 02:36:29 -0500 answered a question Glance metadata when using boot from volume option

This is a bug in Icehouse release:

2016-01-28 02:31:33 -0500 received badge  Famous Question (source)
2016-01-28 02:31:17 -0500 commented answer Ceph Cache Tiering Error error listing images

I was facing the same issue, however I tried to start a VM from volume and get permission denied error, so it was easy to find a problem.

2016-01-27 05:29:38 -0500 commented question Ceph Cache Tiering Error error listing images

You tried to restart glance-registry service?

2016-01-27 02:52:03 -0500 commented question Ceph Cache Tiering Error error listing images

There is not any specific configuration to make this working as I know, so you probably configured something wrong on Ceph side. Which commands you are using on Ceph for this?

2016-01-26 05:32:19 -0500 commented answer How to know cinder version release from CLI?

This command will only get cinder client version.

2016-01-26 05:30:58 -0500 answered a question How to know cinder version release from CLI?

Cinder has multiple services, if installed correctly they should be all same versions:

To get version number from CLI:

cinder-api --version
cinder-volume --version

To match version number with name you can use this as a reference:

Now how to check if there is an update available, depends on your distro and repo which you are using.

2016-01-25 11:18:37 -0500 answered a question Switching from VNC to SPICE console

To rebuild instance xml file you could reboot hard the instance with following command:

nova reboot --hard VM_NAME

I can confirm that this works for OpenStack Icehouse release.

2015-03-06 12:49:24 -0500 received badge  Nice Answer (source)
2014-12-11 16:21:09 -0500 received badge  Notable Question (source)
2014-12-11 16:21:09 -0500 received badge  Popular Question (source)
2014-08-13 01:55:02 -0500 received badge  Nice Answer (source)
2014-06-18 04:37:48 -0500 received badge  Nice Answer (source)
2014-06-17 05:13:23 -0500 commented answer nova-manage db sync: "...No module named rabbit.." and much more

That is because rabbit module for rpc_backend didn't exists before Icehouse release.

2014-06-16 03:35:38 -0500 commented question install lbaas fwaas vpnaas on production neutron

Here is the guide I used to setup those on test environment:

2014-06-16 02:37:30 -0500 commented question nova-manage db sync: "...No module named rabbit.." and much more

Which version of OpenStack you are trying to install, Havana or Icehouse?

2014-06-16 01:59:06 -0500 received badge  Necromancer (source)
2014-06-15 09:47:08 -0500 answered a question What causes 'Namespace' object has no attribute 'volume' restoring a Cinder backup?

There is bug opened for that: and fix which is merged into python-cinderclient package:

However it isn't available in latest Havana release (Ubuntu precise), so you can just apply it manually by changing (/usr/share/pyshared/cinderclient/v1/

815    -    if args.volume:
816    -        volume_id = utils.find_volume(cs, args.volume).id

815    +    if args.volume_id:
816    +        volume_id = utils.find_volume(cs, args.volume_id).id

If you are using v2 API apply same patch in /usr/share/pyshared/cinderclient/v2/

This should resolve error message you got.

2014-02-04 20:38:19 -0500 received badge  Good Answer (source)
2014-01-01 08:51:18 -0500 received badge  Nice Answer (source)
2013-10-24 20:08:21 -0500 received badge  Necromancer (source)
2013-10-10 09:45:00 -0500 commented answer Floating IP pool not visible as admin

Remove all floating IPs, then create pool: nova-manage floating create --ip_range= --pool=nova --interface=eth0. Then try: nova floating-ip-create nova

2013-10-04 01:56:45 -0500 answered a question Cannot see object store work space on dashboard

You need swift or other object storage backend first. Then to see object store in horizon dashboard you need to create service and endpoint in keystone which will point to it. E.g:

keystone service-create --name swift --type object-store --description Swift
keystone endpoint-create --region RegionOne --service-id <id> --publicurl --internalurl --adminurl
2013-10-03 08:26:39 -0500 answered a question How VM image created from tiny flavor works?

It will use default size defined in image. E.g If you download Ubuntu image, add it to glance and launch instance using same image with tiny flavor, your VM will have 2GB of / disk space.

2013-09-25 02:24:09 -0500 answered a question Is it possible to have compute nodes send traffic through their public interface in a flat network?

It is possible to avoid a bottleneck of the controller node by using multi host networking and deploying nova-network service on each compute node. That means each compute node will act like a gateway to their VMs. More information about high availability options here:

This doesn't mean that your VMs will communicate through public interface as they will use same bridge for communication with other VMs in cluster. The only difference is avoiding SPOF on controller node.

2013-09-23 03:53:53 -0500 answered a question fixed_range='' results in critical error when starting nova-network

The fixed_range option is deprecated in Grizzly release and should be set to fixed_range=''. You said that you are using Folsom, so it must be set to work correctly.

2013-09-21 09:29:52 -0500 received badge  Good Answer (source)
2013-09-21 07:49:35 -0500 received badge  Nice Answer (source)
2013-09-21 05:26:07 -0500 answered a question nova network means you can only assign 252 ip addresses?

Nova network can work with any number of IPs. It is using default /24 mask if you don't specify network_size parameter as far as I can remember.


nova-manage network create --fixed_range_v4=
                           --num_networks=1 --label=private
2013-09-14 11:25:59 -0500 answered a question Floating IP pool not visible as admin

When you created floating ip range you didn't specified desired pool. However default pool is nova, so to grab floating ip address you need to specify pool: nova floating-ip-create nova

2013-09-14 11:22:26 -0500 received badge  Enthusiast
2013-09-11 08:00:28 -0500 received badge  Guru (source)
2013-09-05 20:13:12 -0500 received badge  Good Answer (source)
2013-08-13 08:01:39 -0500 commented answer High-level Storage Question

Yes you are right, you can use Ceph as OpenStack backend, not Swift. I just wanted to say that Ceph has Swift compatible API and because of that you can use any Swift client with Ceph, including Horizon dashboard for object store.

2013-08-06 11:23:35 -0500 received badge  Nice Answer (source)
2013-08-06 09:29:40 -0500 answered a question How can I install the latest version of Swift on Ubuntu Precise?

Swift is a part of OpenStack so you need to add cloud archive for grizzly release to get latest version of it:

apt-get install -y ubuntu-cloud-keyring
echo "deb precise-updates/grizzly main" >> /etc/apt/sources.list.d/cloud-archive.list
apt-get update

After that you should get: 1.8.0-0ubuntu1.2~cloud0

2013-08-03 15:52:17 -0500 received badge  Good Answer (source)
2013-08-01 10:22:04 -0500 received badge  Nice Answer (source)
2013-08-01 07:02:03 -0500 answered a question how do you use commands ?

There is no list option there. You can just run:

nova-manage version

To see list of supported subcommands e.g for network you can run:

nova-manage network -h
2013-07-31 01:56:26 -0500 answered a question High-level Storage Question

Yes, Ceph can act as a backend for Swift, Cinder and Glance. Here I posted link for OpenStack and Ceph integration:

2013-07-30 03:37:00 -0500 commented answer Is cinder necessary to be installed for ceph?

Something like that, because you will use Ceph backend storage through Cinder. Cinder must be installed and configured for Ceph, but it will not store any volumes on that host and it doesn't need to be high h/w, as you said.

2013-07-29 03:20:46 -0500 commented question glance unknown accept header ?

Are you using ceph as backend etorage?

2013-07-29 03:17:12 -0500 answered a question Is cinder necessary to be installed for ceph?

Yes, here I wrote what needs to be done to integrate OpenStack and Ceph: