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Questions tagged [openstack]

OpenStack is a collection of open source projects that enables an open, scalable cloud infrastructure. The core of OpenStack is meant to provide consistent APIs and interfaces to a variety of potential back-ends.

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57 votes
4 answers
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Relationship between Vagrant, Docker, Chef and OpenStack (or similar products)?

I am a web developer, but I am also interested in a few administrative tasks. Hence, the new move from pure administration to dev-ops comes handy for me. Anyway, I have some problems to put a few ...
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16 votes
4 answers
35k views

Turn off strict checking of ssh keys

Each user creates and destroys 15+ VM's per day. The VM's are created in the company's internal OpenStack cloud. Every time a new vm is assigned an ip address which has previously been handed out, ...
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  • 1,665
14 votes
2 answers
2k views

How to setup an NFS server that caches a network share?

User data is stored on two fairly large (>1 PB) OpenStack Swift storage clusters. Let them be Cluster A and Cluster B. In addition, there are several PoPs that need to interact with that data. ...
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11 votes
2 answers
11k views

Why does OpenStack distinguish images from snapshots?

Usually, https://serverfault.com/a/268727/126950: snapshot = an exact capture of what a volume looked like at a particular moment in time, including all it's data. image = a total snapshot of a ...
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9 votes
6 answers
55k views

libvirt network error - no 'default' network device found

My original purpose is to create centos image for openstack. Although I did directly with kvm, still wondering about error. Was using this manual for my task. After this command: # virt-install --...
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  • 1,444
9 votes
1 answer
9k views

Vagrant (Virtualbox) host-only multiple node networking issue

I'm trying to use a multi-VM vagrant environment as a testbed for deploying OpenStack, and I've run into a networking problem with trying to communicate from one VM, to a VM-inside-of-a-VM. I have ...
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7 votes
2 answers
15k views

Monitor VM's resources (CPU, RAM etc)

I'm testing Openstack and i'd like to know how can i find out about resource utilization inside instances (Virtual Machines). Openstack uses kvm, qemu and libvirt in my testing environment. Is there ...
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  • 223
6 votes
1 answer
13k views

Does OpenStack make sense for a home server? [closed]

I currently have a home server (HP N40L) running FreeNAS to provide my home with a few basic things like a file server, media streaming, and a few virtualized apps + a windows XP virtual desktop. It ...
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  • 239
6 votes
1 answer
6k views

Why does host swap out VMs when there are 16GB of buffer cache and swappiness = 0? [duplicate]

I have a desktop running Ubuntu Quantal using OpenStack Folsom on an Intel i5 with 32 GB RAM and 2 GB swap. I'm running 7 VMs each sized like a EC2 m1.small, so 1.7 GB RAM each. I'm using KVM. As I ...
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6 votes
2 answers
3k views

Packets only get forwarded when tcpdump running on bridge

I ran into the oddest thing when trying to debug a networking issue with OpenStack. I was doing a ping test between virtual machines. The ICMP request packets only made it to the destination host if I ...
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6 votes
4 answers
15k views

OpenStack: Can I convert a volume into an image?

I am trying to figure out the path of least resistance in OpenStack to get from a live CD to a disk image that can be used for deploying new guest instances. If you boot an OpenStack instance from a ...
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  • 40.3k
6 votes
2 answers
619 views

What is reasonable storage failover time that most OS (VM) can tolerate?

I have a GlusterFS 2 node 2 replica setup. I am planning to use it as OpenStack instance store, in which the VM disk image is stored. From my tests, if the GlusterFS node which the hypervisor ...
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  • 953
6 votes
2 answers
2k views

Are DNAT and REDIRECT equivalent when applied to locally destined traffic?

In setting up our OpenStack environment, I ran into a problem that was preventing instances from contacting a server running on the host. The metadata service (which exposes an HTTP API) runs on port ...
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  • 40.3k
6 votes
1 answer
9k views

What is the difference between OpenStack, CloudFoundry and Stackato?

I'm quite new to all this *aaS thing, and currently I'm trying to wrap my head around concepts and how things basically work. What puzzles me quite a bit at the moment is the difference between a ...
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5 votes
5 answers
14k views

QCOW2 virtual size lowering

I'm trying to get the virtual size of a qcow2 container down so that it can fit in a openstack flavor with 10GB disk. root@node-10:~# qemu-img info zztop.qcow image: zztop.qcow file format: qcow2 ...
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5 votes
2 answers
5k views

Why can't Openstack VM reach itself via it's Floating IP?

I set up an OpenStack Folsom (2012.2) multi-node, single-network infrastructure. Everything runs fine, instances are running good on any compute node, private network works like a charm and all ...
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5 votes
1 answer
7k views

How to attach an interface to an instance with the openstack client?

According to the OpenStack docs the individual clients are deprecated in favor for the openstack client. The following individual clients are deprecated in favor of a common client. (source) So I ...
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  • 808
5 votes
1 answer
7k views

cloud-init does not grow the partition nor the filesystem

I am currenty preparing OpenStack-ready images of CentOS 7 and Ubuntu 14.04. For the "automation" I use Packer, which is provided by you with a JSON-template. Packer then starts the installation ...
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  • 51
5 votes
2 answers
4k views

OpenStack - assign security group to existing instance

I want to assign a security group to an existing instance. Is this possible?
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  • 405
5 votes
1 answer
697 views

Syncing / backup from S3 buckets to openstack swift containers

I need to backup/sync few hundred GB of files in S3 buckets to openstack swift containers. I have thousands of files in several S3 buckets I want to copy/sync over openstack swift containers but I ...
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  • 51
4 votes
5 answers
22k views

libvirtError that domain already exists, but virsh list doesn't show it

When I try to launch an instance with OpenStack, I get the following error in nova-compute.log: (nova.rpc): TRACE: libvirtError: operation failed: domain 'instance-0000000a' already exists with uuid ...
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4 votes
2 answers
17k views

What is the correct network configuration for a devStack VM (virtualbox)?

Usually when I setup a new Ubuntu VM, i keep the eth0 in NAT mode to get the internet & I add a eth1 interface in HostOnly mode so that I can ssh. But using this devStack guide : Running a Cloud ...
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  • 405
4 votes
2 answers
14k views

Extremely slow qemu storage performance with qcow2 images

I'm running some images using libvirt on a small Openstack cluster. Storage performance on these machines is extremely poor: my monitoring tool shows 100% utilisation (usually on writes but sometimes ...
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  • 533
4 votes
1 answer
4k views

Is OpenStack live migration possible without shared storage?

Like many people I am considering creating 'private cloud' using either OpenStack or VMware. VMware vMotion has a nice feature which allows Live Migration of VMs even without shared storage. I have ...
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4 votes
1 answer
15k views

Openstack: What the difference between nova migrate and nova evacuate?

On liberty, I've been searching for a way to "empty" a hypervisor from all its VMs. At the nova client docs, I've found the following commands related to this: nova evacuate : Evacuate ...
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4 votes
4 answers
5k views

Openstack: Is it possible to migrate an instance from a dead compute server to a live one?

I've got a cluster with 84 Openstack Essex compute nodes, one of which decided to pine for the fjords about 2 hours ago, with 8 running instances on it. The instances are all running off qcow2 disks ...
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  • 6,583
4 votes
1 answer
261 views

Is it possible to monitor how OpenStack is allocating virtual infrastructure on a physical one?

I've been wondering whether there's a tool for monitoring how OpenStack is using physical resources (cluster [cpus, ram], network [interfaces, switches]) for its virtual infrastructures? The virtual ...
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  • 91
4 votes
1 answer
2k views

How does OpenStack Glance work with Keystone and what exactly are these configuration options for?

I am configuring Glance to authenticate against Keystone. It works but I am unsure exactly how some of the authentication options interact. I started with the configuring glance documentation, but ...
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  • 40.3k
4 votes
5 answers
589 views

Migration between OpenStack and RackSpace cloud

So I am deploying a OpenStack private cloud in my business. As I understand from research the OpenStack project was created by RackSpace and that their own cloud platform uses OpenStack. So my ...
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4 votes
2 answers
1k views

Deploying Openstack without internet access

I have about a dozen rather beefy machines on a separate network. This network is not (will not be, cannot be) connected to the internet. I'd like to deploy Openstack on them so that they can be used ...
user avatar
4 votes
0 answers
178 views

Erase GPU memory

We have Nvidia GPU cards that can be used by different users in an OpenStack environment. A first user creates a VM with access to a GPU card, then deletes the VM when done. Another user then creates ...
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4 votes
1 answer
377 views

Windows port forwarding, local machine to server

I'm working on Windows 8. I'm trying to connect to an OpenStack cloud which is hosted on a remote server but has a public IP to the API. However, making API calls require calls to additional services ...
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4 votes
3 answers
14k views

Promiscuous mode in KVM

I have cloud system based on Openstack Icehouse-version. Now I want to test newer version of Openstack (Juno) inside my existing cloud. All hosts and guests use Ubuntu 14.04 as their OS. KVM is ...
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4 votes
1 answer
620 views

Automating Configuration of VMware's vSwitch (OpenStack/libvirt/Nova)

There's a lot of talk now about VMware integrating with OpenStack now. I've noticed that Nova network service is working with VMware's standard and vDS. Deploying a full OpenStack instance is not ...
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4 votes
0 answers
376 views

Mounting whole-disk filesystems in Windows 2008?

I am booting a Windows instance in an OpenStack environment. OpenStack can use a "configuration drive" to pass information into the instance. This drive is formatted as a whole-disk MS-DOS ...
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  • 40.3k
3 votes
4 answers
5k views

Does nova support pxe boot?

I'm working on an OpenStack-based project. Now we need a virtual machine to boot from PXE. I cannot find any document about that. Does nova support PXE boot? If yes, how do I create a KVM image that ...
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  • 264
3 votes
1 answer
6k views

OpenStack soft reboot instance vs. sudo reboot

Is there any difference between performing an OpenStack soft reboot instance through the web interface Horizon and SSH into the instance and perform sudo reboot?
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3 votes
3 answers
4k views

GPU support on OpenStack/CloudStack

I'm wondering if anyone here has had success with any of the cloud orchestration layers using a GPU (preferably vGPU)? I've been able to get XenServer 6.2 to successfully see our nvidia GRID K1 card ...
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  • 141
3 votes
1 answer
9k views

How to make a linux VM working as a router

I have access to an openstack account where I can create Linux 14.04 VMs. I have created two network interfaces. "public-net" which is connected to the internet through a router "private-net" which ...
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  • 31
3 votes
1 answer
433 views

OpenStack "quantum" network manager and existing bridge/VLAN devices

The Quantum network manager included with recent versions of OpenStack does not support the --bridge and --bridge-interface arguments to the nova-list network create command. Short of writing a new ...
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  • 40.3k
3 votes
1 answer
4k views

How to convert VirtualBox VM to OpenStack?

I'm running OpenStack in Ubuntu Server 11.10 (installation did using devstack script), but I have some virtual machines that are already running using VirtualBox. How can I convert the VirtualBox ...
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3 votes
2 answers
4k views

Permission denied error when launching instance ("Could not open backing file")

Working with OpenStack, installed from packages available on Debian testing (buster). When I try to launch an instance, it fails after building with this message in nova-compute.log: Could not open ...
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  • 61
3 votes
1 answer
379 views

How to remove / add public network to a server in Rackspace API

I have a server in Rackspace API. I would like to use the nova command to remove the public network interface. I am using the command: nova virtual-interface-list <instance_id> and then ...
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3 votes
2 answers
2k views

Issue with creating an Windows 2008 virtualized image with QEMU

I'm trying to create a QEMU image of a 64-bit Windows 2008 Server install. It will be used on OpenStack as an instance. The virtualization environment (of QEMU) is being run from a VMware virtual ...
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  • 357
3 votes
3 answers
6k views

Cannot connect to Openstack Instance via horizon, but SSH works?

I've got an OpenStack deployment running inside a VM for testing purposes. My setup is as follows: Host Ubuntu x64 with Virtualbox -> Guest Ubuntu x64 with OpenStack -> Ubuntu X64 Server Test ...
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3 votes
3 answers
2k views

projects or packages to emulate a tape drive with a Amazon S3 or OpenStack Swift compatible backend?

I've got some data that is being backed up to tape via bacula, and at some point soon I am going to need to migrate to non-tape storage. Bacula supports to-disk archiving, but it occurred to me that ...
user avatar
  • 10.8k
3 votes
1 answer
311 views

Openstack redundant architecture on three servers

I would like to deploy an Openstack architecture on three (super)servers in a way that if one of server is down the Openstack infrastructure is still functionning. What is the best way to deploy ...
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  • 83
3 votes
1 answer
1k views

What's the point in limiting the number of security groups per tenant In OpenStack?

By default, a tenant (1) can only create 10 security groups (2). Is there any reason to keep this number so low? (1) http://docs.openstack.org/grizzly/openstack-compute/admin/content//users-and-...
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3 votes
1 answer
1k views

How Can I Update user-data on Openstack?

I have a bunch of openstack VMs running on Grizzly. I need to change their domain which is currently managed by cloud-init. How do I update the user-data?
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  • 24.5k
3 votes
1 answer
3k views

Ping responses to floating IPs do not reach the router (iptables/nat)

I'm running OpenStack, and I'm having trouble accessing my instances from floating IPs, from anywhere except the network controller node. I've got a Folsom deployment with FlatDHCP, not running multi-...
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