2.5 Admins 243: 0.5 Centuries

IPv4 addresses are worth an awful lot of money, the serious dangers of a seemingly sensible deepfake law, Microsoft is 50 years old, and our thoughts on antivirus on Linux and Windows.

https://2.5admins.com/2-5-admins-243/

With this spring's (or autumn's) #OpenBSD release creeping ever closer (see https://www.openbsd.org/77.html filling out in near real time), you can prepare for the event by by reading "You Have Installed OpenBSD. Now For The Daily Tasks." https://nxdomain.no/~peter/openbsd_installed_now_for_the_daily_tasks.html.

Enjoy #OpenBSD!

Firewalls function at various layers of the OSI model. Basic stateless firewalls work at layers 3 and 4, filtering traffic by IP address and port. In contrast, application-layer firewalls operate at layer 7, analyzing the actual content of the traffic to make filtering decisions

Here is an overview of firewalls across OSI layers #infosec #sysadmin

Find high-res pdf books with all my #cybersecurity related infographics at https://study-notes.org

Now updated version...

It was #DNS
in #ACME scripts
because systemd-timesyncd failed...

Hearing from more and more #sysadmin folks that the big mail providers are getting so bad that they're unwillingly reading #ryoms to set up their own mail systems.

Kind of a mixed blessing for me. What should I say? "I'm sorry you're going through this, but thanks for the money." "Told you so." "Welcome to suck less."

So I go with "good luck." Because none of us like this.

[Anubis] Utiliser la preuve de travail pour bloquer les robots https://www.journalduhacker.net/s/ew7xa9/anubis_utiliser_la_preuve_de_travail_pour https://www.pofilo.fr/post/2025/04/14-mise-en-place-anubis/ #autohébergement #sysadmin #git

Is there a FreeBSD-equivalent to systemd drop-in replacements for services?

The only way I can see at the moment is just by backing up the original /etc/rc.d/service file and creating a new one to replace it.

IT-Teams aufgepasst!
Mit #NinjaOne & #Chocolatey wird Softwareverteilung endlich flexibel:

Große Pakete? Kein Problem.

Eigene Repos mit BaGet? Easy.

Volle Kontrolle per PowerShell.

So automatisierst du Software-Rollouts auf Windows-Systemen effizient & smart:
https://www.marcogriep.de/posts/ninjaone-chocolatey-softwareverteilung-effizient-automatisieren/

Linux TUI (Text User Interface) software offers a user-friendly way to interact with applications directly from the terminal, using text-based menus and interfaces instead of a graphical desktop environment

Here are a categorized list of useful TUI software available on Linux #sysadmin #opensource

Find pdf books with all my #Linux related infographics at https://study-notes.org

Mettre en place un bac à sable kubernetes https://www.journalduhacker.net/s/wudd4p/mettre_en_place_un_bac_sable_kubernetes https://www.aukfood.fr/bac-a-sable-kubernetes-multi-node-avec-docker-desktop/ #conteneurs #sysadmin

After I started my first #IT job (and created my Digital Ocean VPS at that time) I decided to create kind of character card for myself, like in #RPG, for writing down my #sysadmin skill levels and progress. I did it in Postgres, probably because database container was one of first things I had on my VPS then.

I created slightly complex system of arbitrary skill and knowledge points, trying hard to not overestimate my skill levels. Like in standard games there are bigger gaps between higher levels and separate "overall sysadmin level" with own points, indirectly dependent on skills' levels' upgrades (and more directly on other kind of knowledge points). Many things are highly relative here as it is not possible to accurately describe own degree of knowledge in numbers. Also some kind of skills could have more "levels" (e.g. familiarity with more complex software learned gradually with time) than others. I have point scale for 10 levels now. And I am almost sure I wouldn't reach higher than 6-7 "overall sysadmin level" in my lifetime

I didn't update it since October 2023. Today I log in and tried to clean that mess. I feel I should make short paper notes about my progress frequently, like I was doing in previous job. Updates would be easier...

fingers got confused, how do I exit emacs? #sysadmin

I'm about to (finally) decommission my last bare metal server (for my personal use). It's a Dedibox I ordered (I had to dug in my mails) the 12th of July 2017.

It served me good, it never failed me. It has always rebooted.

You've been a good server, sd-126200 .

I hate the days when porn spammers hit the #fediverse. I know they only do it because it works. Which means, in a way, I hate that portion of #fedi which, probably unintentionally, rewards porn spammers.

But let me give a shoutout of #THANKS to all the #moderators and #sysadmin whose sweat and tears keep #ActivityPub the wonderful place it is.

#ThankYou. Always.

#linux #sysadmin #backups

Whenever you are working with system critical files always remember to create a backup of said files.

Or you'll end up doing one of two things:

1. Regenerating/editing the files as they were before
2. Reinstalling your system

Stay safe.

A subshell is a child shell process created by enclosing commands in parentheses () or by running a script on Linux. A subshell allows enclosed commands to run in isolation from the parent shell environment #sysadmin #devops

Find high-res pdf books with all my #linux related infographics at https://study-notes.org

It's been a while since I've run VMs locally, what is the best option in 2025 for a Windows 10/11 PC?

Is VMware Player/Workstation even a viable option after the Broadcom acquisition and them selling off their EUC department to Omnissa?