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2018-12-12 09:09:02 -0500 marked best answer Converted to raw, but format is now qcow2 ????

I downloaded an image in IMG format and converted it to QCOW2 using "qemu-img convert" command. When I wanna lunch an instance based on this QCOW2 image, I face with the following error:

Build of instance xxxxxxxxxx aborted: Image yyyyyyyyyyyyy is unacceptable: Converted to raw, but format is now qcow2

What's wrong?


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2017-02-20 15:40:21 -0500 asked a question Docker Live Migration

This question has been asked long time ago. OpenStack didn't support Docker live migration. I would like to know if any improvement has been done or any project is going on to address this issue

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2016-12-28 20:18:46 -0500 commented question OVS has high cpu usage, experiencing packet drops

I guess the problem is defining interface on OVS local port. The local port is connected to the ipstack of the machine on which OVS is running. So all the packets flows on the wrong route.

2016-12-28 09:28:44 -0500 answered a question Migration status of a VM

Use 'Virsh' for that.

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2016-12-25 10:23:34 -0500 edited question Is it wise to set up a sdn controller on an openstack VM

I'd like to create something like sdn on dmand in a private cloud. So anyone who has credential can connect to the cloud and set up her own sdn. Is it wise to put the sdn controller on a vm in a cloud IaaS like openstack? I mean I can prepare some images with sdn controller on them. Then anyone who is interested to create a sdn, lunch a vm based on those images (with sdn controller on them) and then set up her own sdn.

2016-12-24 13:31:29 -0500 answered a question how can i do a route from my desktop while i use linuxbridge?

I assume you have a management network, a network for VMs' traffic and an external or public network. This is a standard topology described in openstack docs. If you're gonna get connected from your desktop to any of your existing VMs, you need to do that through your external network. This external network (the physical one not the virtual one) is connected to your controller and your network node(s). So, if you can get your desktop connected to this external network, then you can easily access your VM's through your external network. In fact, you just create a bridge from your desktop to your external network and the openstack takes care of the rest (if your other configuration such as VNC is correct). Just do not forget to set desired configuration in your security group(s) in order to allow legitimate traffic reach your VMs from your desktop.

2016-12-23 10:43:07 -0500 commented answer Ovs as a router

Tricircle is a multi site openstack solution which is still in an experiment phase. What i did is just connecting a compute node to the old cluster through a router

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2016-12-22 11:56:33 -0500 commented answer Ovs as a router

When I use SDN controller, OVS would act as an data forwarding device only. I'm not using OVS as a stand alone switch. Migrating VM between two layer 3 domains is possible in openstack without hacking into the source code. This is something normally done in virtual datacenters.

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2016-12-21 11:08:16 -0500 commented question Ovs as a router

This is an experiment for the role of SDN in wm migration between two layer3 domains. This is why I need to do that in a way I explained. I know there are many easier way to do that but I have to do it as I explained before

2016-12-21 11:04:32 -0500 commented answer OvS, VXLAN, and live migration

my old cluster uses management network for migration. so I put router on my management network. However, when i checked, all VTEPs and VXLAN ports are configured on physical ports on vm network. Now I got confused which network i need to use for migration.

2016-12-21 11:02:25 -0500 commented answer OvS, VXLAN, and live migration

to perform live migration, i need VXLAN. Otherwise, live migration is not possible between two l3 domains

2016-12-21 11:01:36 -0500 commented answer OvS, VXLAN, and live migration

To clarify, I performed live migration in a L2 domain in my openstack cluster successfully. Now, I add another compute node to my old openstack cluster. However, this new compute node is connected to the old cluster via a router. Now my old cluster and new compute node are in two separate L3 domains

2016-12-21 10:56:46 -0500 commented answer Ovs as a router

For some reasons, I don't wanna use that solution. I want to use just one OVS bridge which is connected to a SDN controller with routing support. Then that OVS bridge is in charge of both ethernet ports and route traffic between them. I need help for implementing this solution

2016-12-21 10:54:00 -0500 commented answer Ovs as a router

another solution I tested is using two OVS bridges. Both bridges are connected to one controller. Each bridge is in charge of one ethernet port and I use ip forwarding in linux kernel to route between two OVS bridges

2016-12-21 10:51:27 -0500 commented answer Ovs as a router

Thanks for your answer. As I mentioned, I got my ovs bridge connected to a SDN controller which supports routing for my purpose. My problem is that how I can add those two ports to ovs bridge, because OVS can hold one of the port IPs at a time

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2016-12-20 23:42:01 -0500 commented answer OvS, VXLAN, and live migration

So you mean I need to use vm network for migration not the management?

2016-12-20 18:08:00 -0500 asked a question Ovs as a router

I need to connect two openstack clusters via a router. I use a pc with 3 Ethernet ports and install openvswitch on it. I created an ovs bridge, got it connected to a sdn controller using eth0. I also added the other two physical Ethernet ports to this bridge. Now my ovs bridge has 4 ports naming local, eth0, eth1 and eth2. I need to route traffic between eth1 and eth2. I also added some flow rules for default routing. I just don't know how to assign two ips addresses to the ovs bridge at the same time(for eth1 and eth2). Do I need to use two seperate ovs for each Ethernet port?

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2016-12-20 14:27:42 -0500 commented answer OvS, VXLAN, and live migration

For VXLAN we need to setup VTEPs on both sides. On my openstack, these VTEPs are configured on the OVS ports which is in control of physical Ethernets on 'vm network'

2016-12-19 21:28:52 -0500 asked a question OvS, VXLAN, and live migration


I have a 4-node openstack JUNO cluster (1 controller, 1 network and 2 computes). Live migration and vxlan has been configured on it successfully. I'm gonna add the third compute node through a virtual router (OVS and a controller) to the existing cluster for some live migration experiments over vxlan.

I wonder which network should be used for this? 'vm tarffic' network or 'management' network? Migration, by default, uses management network. However, when I check my ovs bridges on compute nodes I see vxlan ports has been set up on 'vm traffic' network not 'management' network.

I'd like to know where I need to put my virtual router to set up a vxlan tunnel for live vm migration between my new and those two old compute nodes?(migration over L3 networks)

Besides, i need to know wether enabling vxlan on my compute nodes will be enough or I need to enable vxlan interfaces on my virtual router (between my compute nodes) as well?


2016-12-07 12:25:30 -0500 commented answer How to connect two Openstack clusters? (multi-site configuration)

Thanks for the answer. If I do not mistake, you guys mean the only way a cloud data center, based on Openstack, can perform live migration between its sites is to set up the whole data center based on Openstack cells. Otherwise, no inter-site live migration is possible even if VXLAN or GRE is used

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2016-12-05 20:38:50 -0500 commented answer How to connect two Openstack clusters? (multi-site configuration)

Thanks for your answer, but I'm more of a technical help for multi-site implementation rather than a high level explanation of regions and cells; Some sort of 'How To Do' stuff, or maybe a technical tutorial.

2016-12-05 19:03:43 -0500 edited question How to connect two Openstack clusters? (multi-site configuration)


I have a four-node Openstack juno cluster consisting of 1 controller, 1 network, and 2 compute nodes. Besides, I also have another two-node openstack juno. I want to connect them together through a layer 3 networking device such as a router. In this way I can test vm migration through vxlan between two different openstack clusters (sites). However, I have no idea how to connect two different sites together. For example, do I need to connect them through their management network? If yes, any specific configuration in nova or neutron is required? I will be grateful for any kind of technical help.


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