Hey #Mastodon users running online servers,
I have a question:

Is auto-ban IP for 24h systematically if they call well known ports without any service provided (FTP / SMB / ...) a good way to limit port scanners efficiency?

#network #web #SystemAdministration

Hello #Mastodon! First post here.

I've been developing mend: a Zsh-native recovery tool for #ArchLinux. It maps terminal exit codes to the Arch Wiki using #fzf.

v0.4.0 is live. Short demo video attached. (1/2)

#Linux #OpenSource #Zsh #TUI #SystemAdministration #AUR #Mend

#Linux security best practice: Create system user accounts for services that can’t be used for login: `useradd -r -s /sbin/nologin servicename`

🔗 Learn more in my course: https://monospacementor.com/courses/linsys-1/

#Linux #SystemAdministration #SysAdmin

TIL (at 3 am): Upgrading Dovecot is not fun when the behavior changes a lot. Took several hours to get it running identical to before. But at least I could remove some old configuration parts.

Ever struggled to explain “Linux fragmentation” to non‑tech friends? 🚗💨

You’re chatting with friends, family, or a non‑technical manager and the question lands:

“Why are we using Red Hat at work when my friend uses Ubuntu at home? Aren’t they both just Linux? Why is this so complicated?”

Explaining a modular, kernel‑based world to someone used to one neat product (macOS, Windows, iOS) can feel like explaining car mechanics at a dinner party.

So how do you make it click?

Here’s an analogy I’ve used for years that usually gets an instant “Aha!” from non‑tech people.

Engine vs. Vehicle

🔧 Kernel = Engine
The Linux kernel is the engine: the core machinery that actually makes things run. It’s powerful and reliable – but an engine alone doesn’t get you anywhere.

🚗 Distro = Vehicle
A distribution (distro) is the whole vehicle built around that engine: body, seats, dashboard, storage, tools. It’s the engine plus everything else you need to actually use it, assembled for a particular purpose.

And just like in real life, we don’t pick a vehicle because of the paint job; we pick it because of what we need it to do.

Everyday Examples
To pull it out of the “enterprise IT” bubble, I frame it with everyday roles.

🚛 The Commercial Truck (Server) – RHEL, Debian
A big truck that hauls heavy loads non‑stop. Not designed for comfort or looks, just for doing the job, reliably, for years. That’s your server: often no GUI, older but proven components, maximum stability.

🚙 The Daily Driver (Workstation) – Fedora, Ubuntu LTS
Your normal car: comfortable, up‑to‑date, good enough for commuting, shopping, road trips. That’s a developer or desktop distro: modern tools, stable enough for everyday work and testing.

🛠️ The Specialist Van (Niche Distros) – Kali Linux

A van packed with custom tools for a single trade – like a locksmith’s or electrician’s van. You don’t use it for everything; you use it when you need that specific toolkit. That’s a security‑focused distro.

So is this “fragmentation”?
“They all share the same core engine, but the ‘vehicles’ are customized for different jobs. Servers, laptops, and security toolkits all run Linux – just tuned differently.”

Same engine, different roles:
• long‑running servers,
• everyday work machines,
• highly specialized tools.

Your Turn

How do you explain the “many Linuxes” problem to people who aren’t in IT – friends at a bar, parents, or colleagues from non‑tech teams?

Drop your best analogies and stories below 👇

#Linux #OpenSource #DevOps #SystemAdministration #CloudComputing #TechCommunication #EverydayTech

An introduction to SSH

https://negativepid.blog/an-introduction-to-ssh/

#SSH #secureShell #IT #sysAdmin #systemAdministration #commandLine #Cybersecurity #cyberattacks #cyberThreats #onlineSecurity #negativepid

Easy way to kickstart a runbook: Log actions with “history | tail -20 | tee file.md” to capture recent commands, then add explanations.

🔗 Learn more in my course: https://monospacementor.com/courses/linsys-1/

#Linux #SystemAdministration #SysAdmin

Linux tip: Use “ss -tuln” to check for open ports. Filter specific port numbers by adding “| grep :80”, for example.

🔗 Learn more in my course: https://monospacementor.com/courses/linsys-1/

#Linux #SystemAdministration #SysAdmin

If you want to raise your shell scripts to a new level, give this a try! It'll give useful feedback on the style of your shell code and on possible issues with it.

https://www.shellcheck.net/

PS: Know when to switch to a proper programming language.

#Linux #SysAdmin #SystemAdministration