System & Network Admin

In Working with Postgres types I showed an example of a materialized view that depends on a typed set-returning function. Because Postgres knows about that dependency, it won’t allow DROP FUN…

broot is a utility that gives an overview of a directory, and much much more. It's free and open source software.

If you’ve ever spent ages waiting for an Ansible playbook to get through a bunch of tasks so yours can be tested, then this article is for you. Ansible can be pretty tedious to debug and obsc…

Slack's Secret STDERR Messages

Streamline SSH with two very specific SSH tools: ssh-agent and the SSH config files.

The Linux kernel is turning 30 this year! If you're like us, that's a big deal and we are celebrating Linux this week with a couple of special posts. Today we start with a roundup of responses from around the community answering "What Linux kernel module can you not live without? And, why?" Let's hear what these 10 enthusiasts have to say. I guess some kernel developers will run away screaming when they hear my answer. Still, I list here two of the most controversial modules:

The number one problem, according to the security company's latest report, is organizations using out-of-date, unsupported operating systems and programs.

Create and deploy reproducible infrastructure with CDKTF

The stat command, included in the GNU coreutils package, provides a variety of metadata, including file size, inode location, access permissions and SELinux context, and creation and modification times, about files and filesystems. It's a convenient way to gather information that you usually need several different commands to acquire.

Get right into tmux with a gentle learning curve. We go through managing panes, windows, and sessions in this blog post.

CAA is a type of DNS record that allows site owners to specify which Certificate Authorities (CAs) are allowed to issue certificates containing their domain names. It was standardized in 2013 by RFC 6844 to allow a CA “reduce the risk of unintended certificate mis-issue.” By default, every public CA is allowed to issue certificates for any domain name in the public DNS, provided they validate control of that domain name.

A Certification Authority Authorization (CAA) record is used to specify which certificate authorities (CAs) are allowed to issue certificates for a domain.

I discussed about certificates in 10g WebGate expiry after 365 days and fix is to re-configure WebGate that will generate new certificate for one year (To change duration of certificate update default_days in $WEBGATE_HOME/oblix/tools/openssl/ openssl.cnf ) Certificates for WebGates are stored in file with PEM extension. You can open PEM file to view validity of certificate using opensssl as shown below openssl […]

Computer users tend to amass a lot of data over the years, whether it's important personal projects, digital photos, videos, music, or code repositories. While hard drives tend to be pretty big these days, sometimes you have to step back and take stock of what you're actually storing on your drives.

Grav is an easy to use, yet powerful, open source flat-file CMS

802.1X has little relevance over time.  As distributed work becomes widespread, laptops and smartphones will not connect to campus or branch networks operated by IT departments. Home broa…

This step-by-step guide explains how you can enable an Ubuntu remote desktop so that you can access and control it remotely.

Computers are good at automation, but not everyone knows how to make automation work. It's a real luxury, though, to be able to schedule a task for a computer at a specific time and then forget about it. Maybe you have a file to upload or download at a specific time, or you need to process a batch of files that don't yet exist but are guaranteed to exist by a certain time or a setting that needs monitoring, or maybe you just need a friendly reminder to pick up bread and butter on the way home from work.

learn basic automation with puppeteer, javascript. Learn how to click element, how to find element, how to type and how to select element.

In which I hope to become a better shell citizen. But probably won't.