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3 solid self-review tips for sysadmins
Self-reviews are tough. These three tips will help you to get credit for all those great solutions you implemented this year.
Anthony Critelli Mon, 2/15/2021 at 8:43pm
Tips for your self-review

Photo by Min An from Pexels

At every job I’ve held, the general opinion about self-reviews tends to fall into one of two categories. Either employees view them as arduous and frustrating or they simply don’t care about them. However, I believe that a well-written self-review can help you accelerate your career, whether your goal is a raise, a promotion, or merely some well-deserved recognition for your efforts. In this article, I’ll discuss my approach to performance reviews. While there is no one-size-fits-all strategy, this approach has served me well through several organizations and positions.

Topics:   Linux   Career  
How the oc debug command works in OpenShift
Try a new way to connect to and debug your Red Hat OpenShift Container Platform cluster nodes.
Kedar Vijay Kulkarni Wed, 2/17/2021 at 12:40am
Butterfly with code matrix background

Image by Dr StClaire from Pixabay

If you have used relatively recent versions of OpenShift, you must have come across the oc debug command (or you can check this man page). One of the interesting things about the new OpenShift is that it suggests not to use SSH directly (you can see this in sshd_config on the nodes because they have PermitRootLogin no set on them). So if you were to run oc debug node/node_name, it will create a pod for you and drop you in the shell (TTY) of this pod.

Topics:   Linux   Openshift  
How to use the sipcalc Linux command line tool
The sipcalc command prevents hard CIDR calculations and helps your fellow sysadmins adhere to the CIDR house rules.
khess Wed, 2/10/2021 at 6:13pm
How to use the sipcalc command line tool in Linux
Photo by cottonbro from Pexels

The only network numbers I can keep in my head are now and always have been a Class C network with a 24-bit netmask, such as I know there are 254 usable host addresses available with a broadcast address of, a gateway/router address of or (depending on who's running the network), and a human-readable netmask of That's my standard network. After all, 254 hosts are enough for any subnet, right? Wrong.

6 resources and 3 tips to help you enter the world of Linux containers
Here are some tips, ideas, and resources to help you develop your container vocabulary and start working with this useful technology.
Joerg Kastning Mon, 2/15/2021 at 10:56pm
How to enter the world of Linux containers
Photo by Skitterphoto from Pexels

This year I started becoming familiar with Linux kernel namespaces, rootless containers, and the toolchain around Podman. In this article, I share my first experiences with beginners as well as developers, product managers, and solution architects so you all get to know how it feels to be a newbie to the container world.

Topics:   Linux   Linux Administration   Containers  
Sharing supplemental groups with Podman containers
Rootless Podman containers can introduce challenges when trying to share resources between the host and containers. Find out how supplemental groups can help.
Dan Walsh Tue, 2/16/2021 at 11:53pm
Colorful cubes

Image by lisa runnels from Pixabay

Rootless Podman containers is a really cool feature that allows users to run almost all containers in their home directory without requiring any additional privileges.

Rootless containers take advantage of the user namespace, as I explained in this blog.

Topics:   Linux   Containers  
Using Irssi inside a Linux tmux session
If you like IRC, you'll love the Irssi client, especially when coupled with an always-open tmux session.
Peter Gervase Mon, 2/8/2021 at 11:00pm
Using irssi inside a tmux session
Photo by Christina Morillo from Pexels

If you're already somewhat familiar with tmux and Irssi, feel free to just refer to the basic steps in the TL;DR section below. For more details and options, check out the more in-depth configuration steps farther down the page.

Topics:   Linux   Command line utilities  
Resilient sysadmin: 5 tips for success in a remote work environment
Here are five in-the-trenches tips on how to cope with your work from home life.
tcarriga Sun, 2/14/2021 at 1:30pm
5 tips for success in a remote work environment
Photo by Keira Burton from Pexels

I'm sitting here one month into 2021 and I was thinking about the challenges that we faced in 2020 and how resilient the tech industry has been. The industry is nothing without the people who do the work. So that got me thinking, "How are people doing?"

Topics:   Linux Administration   Career  
Move your Linux from legacy BIOS to UEFI in place with minimal downtime
This article describes a complete procedure for moving to UEFI.
Vincent Cojot Tue, 2/2/2021 at 3:38pm
Hand erasing

Photo by cottonbro from Pexels

I don't know about you but I don't like to reinstall my operating system. I find it a complete waste of my time for something that should just update in place. Some people, often using other platforms, prefer a good once-a-year wipe and reinstall to regain the original speed of their systems. I just don't subscribe to this point of view. There are many ways to maintain a system and I usually prefer some investigative debugging rather than wiping and hoping for the best.

Topics:   Linux   Hardware   Systems Architecture  
A how-to guide for your first remote Red Hat certification exam
Remote work and remote training are the new paradigms. Here's how to prepare for a remote certification exam.
Joseph Tejal Mon, 2/8/2021 at 10:23pm
A variety of tools, hammer, drill, plyers, wrench, etc on a table top

Image by picjumbo from Pixabay

The challenges of the past year have enabled us to do things differently, including the way one learns through online training and testing your skills through certification exams. These self-growth initiatives continue to help you further advance your knowledge and careers as sysadmins. These opportunities also positively impact your organizations.

Topics:   Linux   Career  
How to create a TLS/SSL certificate with a Cert-Manager Operator on OpenShift
Use cert-manager to deploy certificates to your OpenStack or Kubernetes environment.
Bryant Son Thu, 2/11/2021 at 4:10pm
How to create a TLS/SSL certificate with a Cert-Manager Operator on OpenShift

Photo by Tea Oebel from Pexels

cert-manager builds on top of Kubernetes, introducing certificate authorities and certificates as first-class resource types in the Kubernetes API. This feature makes it possible to provide Certificates as a Service to developers working within your Kubernetes cluster.

cert-manager is an open source project based on Apache License 2.0 provided by Jetstack. Since cert-manager is an open source application, it has its own GitHub page.

Topics:   Linux   Openshift