OpenStack: Create Instance Snapshot to backup or migrate Instance

openstack: create instance snapshot to migrate or restore instance
OpenStack Snapshots can be utilized to backup Instance before some critical changes are made on Instance OS or to migrate Instance to the new OpenStack Cloud.
In this tutorial we will create snapshot from existing Instance to launch it in different Cloud, but you can also create snapshot just to backup the Instance and restore it’s state later in the same Cloud, if needed.
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Convert qcow2 to raw image and raw to qcow2 image

qemu-img is a QEMU disk image utility, which allows us to create, convert and modify images offline. It can handle all image formats supported by QEMU (including qcow2 and raw image format).
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Edit qcow2 or raw image files offline using virt-edit

Sometimes I need to edit files inside qcow2 or raw image, but for some reason I don’t want to launch the image in KVM or in Openstack cloud. The image can be edited offline using virt-edit tool.
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How to Install Docker on Fedora 23

Docker is a software which automates the deployment of applications inside Linux containers, by providing an additional layer of abstraction. This guarantees that it will always run the same, regardless of the environment it is running in. Docker uses the resource isolation features of the Linux kernel such as cgroups and kernel namespaces to allow independent containers to run within a single Linux instance, avoiding the overhead of starting and maintaining virtual machines.

In this tutorial we will setup and launch Docker software on Fedora 23 (64-bit) release.

Prerequisites for Docker installation on Fedora release:
Fedora version: Fedora 22 (64-bit) or higher
kernel version: 3.10 or higher
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Install OpenStack on KVM – How To Configure KVM for OpenStack

Typical OpenStack cloud setup consists of more than one node (usually one Controller node and several Compute nodes), which requires lot of physical computers / servers available to perform the installation. This complicates the situation, especially if we need to test OpenStack on many nodes. Fortunately we can use Linux KVM (Kernel-based Virtual Machine) to create OpenStack on virtual nodes and avoid problems with obtaining physical hardware.

In this tutorial we will show you how to install OpenStack on KVM on Fedora 21 based hypervisor. We will run Openstack installation on two KVM based virtual nodes (Controller and Compute).

The most important part in configuring KVM for OpenStack installation is network setup, we also need to secure some resources (VCPUs, RAM, disk space) on KVM Hypervisor to create two virtual nodes.

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