SSH key management basics
How SSH keys work and how to manage them: one ed25519 key per device, the permissions sshd demands, config Host blocks, and revoking a lost key.
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Manage multiple Linux servers: tools that work
SSH config, tmux, Ansible, Uptime Kuma, Zabbix and Webmin, ranked by how many servers you have: what each replaces, setup cost in minutes, the one gotcha.
What ports are and how Linux services listen
A port is how a server sorts incoming traffic to the right service. Learn to read what is listening with ss, and tell a local port from a public one.
Run a program as a systemd service on a VPS
A systemd service keeps your program running: start on boot, restart on crash, log to the journal. How to write one, add a timer, and harden it.
Linux vs Windows Server: which to run
A practical comparison of Linux and Windows Server: cost, footprint, remote management, web stacks, Active Directory, and when each is right.
Linux vs FreeBSD for servers
A fair comparison of Linux and FreeBSD as server systems: base design, licensing, packages, ZFS and jails, containers, and where each one wins.
Run services as an unprivileged user
Running a service as root turns one bug into full server access. Give each service its own unprivileged account, or let systemd do it with DynamicUser.