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Category: Virtualization

Install Nextcloud with Docker on Debian 10 Buster

April 23, 2019November 26, 2019 14 Comments

Nextcloud is a lightweight, open-source StaaS (Storage as a Service) platform, written i PHP and JavaScript, which provides file sync, file sharing and creative collaboration services. The software can be installed on local hardware as a perfect alternative for commercial […]

Grzegorz Juszczak Linux, Storage, Virtualization

Enable UEFI for QEMU KVM on Fedora

May 31, 2018June 2, 2018 No Comments

UEFI (Unified Extensible Firmware Interface) has become a successfull successor of an outworn and obsolete BIOS firmware. Emulating UEFI based hardware on KVM/QEMU Virtual Machine is possible thanks to so called OVMF (Open Virtual Machine Firmware), which comes from EDK2 […]

Grzegorz Juszczak Linux, Virtualization

How to configure Docker Proxy on CentOS 7, RHEL 7

May 25, 2018May 25, 2018 1 Comment

How to enable Proxy for Docker engine with or without authentication on CentOS 7, Red Hat Enterprise Linux 7?

Grzegorz Juszczak Linux, Virtualization

OpenStack Pike VLAN and Flat network based installation using Packstack

December 30, 2017January 25, 2018 5 Comments

In previous articles regarding OpenStack RDO installations we presented OpenStack deployments using Packstack automated installer script, which still required some post-installation networking configuration to be performed in order to accomplish whole deployment. This time we will try to prepare Packstack […]

Grzegorz Juszczak Cloud Computing, Virtualization

How to find qbr,qvo interfaces of the particular Instance in OpenStack

November 20, 2017November 22, 2017 No Comments

OpenStack networking topology is pretty complicated structure, even with it’s, let’s say, default configuration based on OVS (OpenVSwitch), not even mentioning about additional overlays, like OpenDaylight or Nuage. If you are troubleshooting network issues in regard to a particular Instance […]

Grzegorz Juszczak Cloud Computing, Virtualization

How to Install VirtualBox 5.1 on Fedora 23 from RPMs

November 17, 2016November 23, 2016 No Comments

Oracle VM VirtualBox is a flexible open-source hypervisor for x86 computers from Oracle Corporation initially developed by Innotek GmbH. It runs on many platforms including: Linux, Windows, Solaris, providing great virtualization environment to run multiple VMs at a time. In […]

Grzegorz Juszczak Linux, Virtualization

Install and Configure KVM (Bridge Net Interface) on CentOS 7 / RHEL 7

July 1, 2016April 6, 2022 28 Comments

KVM (Kernel-based Virtual Machine) is a virtualization infrastructure for the Linux which requires a processor with hardware virtualization extension to be able to host guest sytems. KVM is convenient solution to test and try different operating systems if you don’t […]

Grzegorz Juszczak Linux, Virtualization

How to shrink OpenStack qcow2 image using qemu-img

May 24, 2016November 22, 2019 No Comments

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. During image conversion the empty sectors […]

Grzegorz Juszczak Cloud Computing, Virtualization

virt-what: Check if your remote server runs in virtual environment

May 13, 2016May 13, 2016 No Comments

Have you ever wondered if the server you bought at the hosting provider is in fact a dedicated server or just a VPS and what is the underlying virtualization environment your server runs on? virt-what provides us the ability to […]

Grzegorz Juszczak Linux, Virtualization

Configure OpenStack Instance at boot using cloud-init and user data

May 3, 2016December 23, 2018 3 Comments

The administration of the large-scale production cloud environments requires the management of dozens of customer’s virtual servers (OpenStack Instances) in the cloud on the daily basis. Manual configuration of the multiple newly created Instances in the OpenStack cloud at a […]

Grzegorz Juszczak Cloud Computing, Virtualization

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