Tagged “ubuntu”

What Is tmux? A Beginner's Guide to Keeping SSH Sessions AliveWhat is tmux and how does it work? A tmux guide from scratch: sessions, windows and panes, the prefix key, detach and attach, tmux.conf and a cheat sheet. Infrastructure 2026-10-09 8 min How to Create a systemd Service on Linux (Unit File Guide)Create a systemd service on Linux: write a unit file with User, WorkingDirectory, Restart and EnvironmentFile, enable it and read logs with journalctl. Infrastructure 2026-10-09 8 min rsync Command in Linux: Copy and Sync Files Between ServersThe rsync command in Linux with examples: -avzh, the trailing slash rule, dry-run, the risks of --delete, exclude, custom SSH ports and resuming transfers. Infrastructure 2026-10-09 8 min Linux Server Monitoring: What to Watch and Which Tools to UseLinux server monitoring made simple: what to watch (CPU, load average, memory, disk, services), built-in tools, Netdata, and a cron health-check script. Infrastructure 2026-10-09 9 min Linux Server Disk Full? How to Find and Free Up SpaceLinux server disk full? Find the culprit with df, du and ncdu, then fix deleted-but-open files, logs, the journal, apt, Docker, inodes and alerting. Infrastructure 2026-10-09 8 min Essential Linux Commands for Server AdministrationEssential Linux commands for managing an Ubuntu server, grouped by task, with real examples and a cheat sheet of the 25 you will use every day. Infrastructure 2026-10-09 8 min How to Install Docker on Ubuntu 24.04 (Docker Engine)How to install Docker on Ubuntu 24.04 from the official repository: post-install steps, hello-world test, docker.io vs. docker-ce, and full uninstall. Infrastructure 2026-10-09 7 min Free SSL Certificate with Let's Encrypt and Certbot on UbuntuGet a free SSL certificate from Let's Encrypt with Certbot on Ubuntu for Nginx or Apache, for .ir or any domain: auto-renewal, wildcards and common errors. Infrastructure 2026-10-09 8 min Cron Jobs in Linux: Crontab Syntax Explained (and systemd Timers)How cron jobs work in Linux: the five crontab time fields with examples, /etc/cron.d, environment pitfalls, logging, flock and systemd timers. Infrastructure 2026-10-09 9 min Ubuntu 24.04 Server Hardening: The First Hour, Step by StepUbuntu 24.04 server hardening in the first hour: a non-root user, SSH key-only login, ufw, automatic security updates, fail2ban and time sync. Infrastructure 2026-10-04 9 min