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How to use Port Knocking on Ubuntu to hide the SSH port

You all know these old gangster films where a guy uses a knock sequence on a door to get in? Port Knocking is exactly...

Linux:Copy, change permissions and ownership of a file in a command

Today I came across a requirement to copy couple of files and change permissions to execute those files when writing some ansible playbooks. We...

Distribution Release: ClearOS 7.2.0

Devin Johnson has announced the release of ClearOS 7.2.0, the latest stable version of the project's CentOS-based distributions designed for servers: "ClearOS 7.2.0 final for all...

Ubuntu 16.04: Something to Get Excited About

It’s been quite some time since the Ubuntu faithful could be seriously excited about a release. With good reason. Over the past few years,...

Verifying the Integrity of Linux ISO Images

With the current fervor about compromised ISO images, lots of people (including me) are saying that you should always verify an ISO image after...

How to configure Nginx with free Let’s Encrypt SSL certificate on Debian or Ubuntu...

Let’s Encrypt is a free, automated, and open certificate authority for your website or any other projects. You can grab free TLS/SSL certificate including...

12 Linux dd, ddrescue and dcfldd command examples

The dd command stands for “data duplicator” and used for copying and converting data. It is very powerful low level utility of Linux which...

Set up DVR on RDO Mitaka Milestone 3 (CentOS 7.2)

Initial RDO Three Node system deployment ML2/OVS/VXLANController/Network node - 192.169.142.127 (nova && neutron services) Storage node - 192.169.142.157 (glance,cinder,swift services )Compute node - 192.169.142.137...

Making the Internet Safer, One Secure Site at a Time: Let’s Encrypt Hits 1...

Let’s Encrypt today issued its one millionth free certificate (at 9:04am GMT to be exact), just about 100 days after it released its beta version of...