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Month: January 2016

OpenStack: How to Manually Delete Orphaned Neutron Port

January 30, 2016January 30, 2016 1 Comment

From time to time, especially during testing and automated script tenant deployment, my OpenStack cloud installation gets disordered. Situations when I am unable to delete neutron port in Horizon dashboard are pretty common phenomenon, this most likely leads to problem […]

Grzegorz Juszczak Cloud Computing

GlusterFS Storage Setup on Two CentOS 7 Servers and Client

January 25, 2016July 31, 2016 5 Comments

GlusterFS is a simple and easy to configure scalable network attached storage. GlusterFS is a distributed storage consisting of nodes (servers including storage bricks), which export their own local file system as a volume. Volumes can be mounted on client […]

Grzegorz Juszczak Linux, Storage

Convert qcow2 to raw image and raw to qcow2 image

January 24, 2016February 10, 2016 3 Comments

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).

Grzegorz Juszczak Linux, Virtualization

Edit qcow2 or raw image files offline using virt-edit

January 22, 2016February 10, 2016 1 Comment

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.

Grzegorz Juszczak Cloud Computing, Virtualization

Upgrade from Fedora 21 to Fedora 22 using DNF

January 3, 2016January 3, 2016 No Comments

Starting from Fedora release 21 (Twenty One), Fedora can be upgraded using DNF system upgrade, which is recommended upgrade method for Fedora 21 and later releases. DNF is a kind of successor for FedUp (FEDora UPgrader), which is now obsolete, […]

Grzegorz Juszczak Linux

How to Install Docker on Fedora 23

January 3, 2016February 11, 2016 No Comments

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 […]

Grzegorz Juszczak Linux, Virtualization

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