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Month: May 2016

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

Download Kali Linux OpenStack KVM qcow2 image by tuxfixer.com

May 20, 2016March 23, 2022

Kali Linux (formerly known as BackTrack Linux) is an open-source, Debian-based Linux distribution designed for advanced Penetration Testing and Security Auditing. Kali Linux contains dozens of tools targeted towards various information security tasks, such as Penetration Testing, Security Research, Computer […]

Grzegorz Juszczak Cloud Computing, OpenStack / KVM Images

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

Scan Remote Host for Open Ports using nmap Port Scanner

May 12, 2016July 26, 2016 No Comments

nmap (Network Mapper) is an open source tool for network exploration and security auditing and a powerfull port scanner. It can be used locally on localhost as netstat alternative, but it’s main use case is to scan remote hosts for […]

Grzegorz Juszczak Linux, Security

Linux cp mv overwrite without prompt (disable interactive mode)

May 10, 2016May 10, 2016 1 Comment

Some Linux distributions (for example: RedHat) have aliases configured in the system, especially for root user, which modify basic command line operations like: cp, mv by adding “-i” parameter to prevent user from accidental overwriting or deleting files (interactive mode). […]

Grzegorz Juszczak Bash, Linux

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

OpenStack: Create Instance Snapshot to backup or migrate Instance

May 2, 2016May 2, 2016 No Comments

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 […]

Grzegorz Juszczak Cloud Computing, Virtualization

Kali Linux VPS with discount

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