Download Scientific Linux OpenStack KVM qcow2 image by tuxfixer.com

Download Scientific Linux OpenStack KVM qcow2 image by tuxfixer.com
Scientific Linux is a Fermilab sponsored, stable, scalable, and extensible operating system for scientific computing based on Red Hat Enterprise Linux. It has even been loaded onto systems at the International Space Station. Two most famous experiments to depend on Scientific Linux are the Collider Detector and DZero experiments at Fermilab and the Large Hadron Collider experiments at CERN.

Below you can find Scientific Linux OpenStack/KVM 64bit qcow2 image based on SL 7.2 (Nitrogen) x86_64 release:
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Download Trisquel Linux OpenStack KVM qcow2 image by tuxfixer.com

Download Trisquel GNU/Linux OpenStack KVM qcow2 image by tuxfixer.com
Trisquel GNU/Linux is an elegant and lightweight Linux distribution, derived from Ubuntu, which uses fully free software system without proprietary software or firmware. Trisquel uses modified kernel from Ubuntu distribution, with the non-free code removed and is listed by the Free Software Foundation as a distribution that contains only free software.

Below you can find Trisquel GNU/Linux OpenStack/KVM 64bit qcow2 image based on Trisquel Mini 7.0 x86_64 release:
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OpenStack Horizon Error: Unable to get network agents info

OpenStack Horizon Error: Unable to get network agents info
OpenStack Dashboard Error: Unable to get network agents info often seen in Horizon is a result of Neutron related problems.

Usually the problem is caused by neutron-service failure due to service operation time outs.

The below screenshot presents OpenStack Dashboard Error: Unable to get network agents info:

openstack error: unable to get network agents info
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Install and Configure OpenStack Mitaka with GlusterFS on CentOS 7

integrate openstack with glusterfs storage
OpenStack can use diffirent backend technologies for Cinder Volumes Service to create volumes for Instances running in cloud. The default and most common backend used for Cinder Service is LVM (Logical Volume Manager), but it has one basic disadventage – it’s slow and overloads the server which serves LVM (usually Controller), especially during volume operations like volume deletion. OpenStack supports other Cinder backend technologies, like GlusterFS which is more sophisticated and reliable solution, provides redundancy and does not occupy Controller’s resources, because it usually runs on separate dedicated servers.

In this tutorial we are going to deploy VLAN based OpenStack Mitaka on three CentOS 7 nodes (Controller, Network, Compute) using Packstack installer script and integrate it with already existing GlusterFS redundant storage based on two Gluster Peers.

openstack installation and integration with glusterfs
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OpenStack: Unable to Connect to Horizon Dashboard

Packstack Error: Command exceeded timeout
Pretty often after rebooting Controller node or powering it on after shutdown, the Horizon (OpenStack Dashboard) is not responding, but we know that it worked before reboot. This issue may be caused by httpd service (Apache), which entered failed state right after powering on the Controller node.

This results in browser’s connection problem to the Horizon:

chrome_unable to connect
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KVM OpenStack Error: /Stage[main]/Nova::Db::Sync/Exec[nova-db-sync]

Packstack Error: Command exceeded timeout
Few times during KVM based OpenStack (Mitaka, Newton) automated installations using packstack we encountered DB synchronization errors.

It turned out, that these installation errors appeared due to slow network and/or poor hardware performance of KVM virtualized hardware used to build OpenStack virtual nodes (Controller, Network, Compute).
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Download Arch Linux OpenStack KVM qcow2 image by tuxfixer.com

Download Arch Linux OpenStack qcow2 image
Arch Linux is a Linux distribution developed according to the KISS principle (“keep it simple, stupid”) as the general guideline, focuses on elegance, code correctness, minimalism and simplicity, which expects the user to make some effort to understand the system’s operation and configuration.

Below we have generated Arch Linux OpenStack / KVM 64bit qcow2 image based on Arch Linux 2016.06.01 Base x86_64 release:
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Download Manjaro Linux OpenStack KVM qcow2 image by tuxfixer.com

download manjaro linux openstack qcow2 image
Manjaro Linux is a lightweight Linux distribution based on Arch Linux and it’s package manager called pacman. Manjaro has recently become popular due to it’s simplicity and design to work fully out of the box.

We have generated Manjaro Linux OpenStack / KVM 64bit qcow2 image based on Manjaro Xfce x86_64 release:
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Download Linux Mint OpenStack KVM qcow2 image by tuxfixer.com

download linux mint openstack qcow2 image
Linux Mint is a community-driven Linux distribution based on Debian and Ubuntu that strives to be a “modern, elegant and comfortable operating system which is both powerful and easy to use.

Below you can find Linux Mint OpenStack / KVM 64bit qcow2 ready to use image based on Linux Mint 17.3 Rosa Xfce 64bit ISO image:
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How to shrink OpenStack qcow2 image using qemu-img

shrink openstack qcow2 image
If you transfer qcow2 images very frequently across OpenStack Clouds or between KVM and Openstack environments, they can quickly grow larger. Luckily qcow2 image size can be decreased to reasonable values using qemu-img tool. Below we present how to shrink Openstack/KVM qcow2 image.
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