Tagged “linux”

How to Fix 502 Bad Gateway in Nginx with PHP-FPMFix 502 Bad Gateway in Nginx with PHP-FPM: read error.log, fix socket path and permissions, pm.max_children, timeouts, header buffers and nginx -t. Infrastructure 2026-10-10 9 min What Is a VPS? VPS vs. Shared vs. Dedicated HostingWhat is a VPS, what is it used for, and how does it compare with shared hosting and a dedicated server? Find out which one fits your website or app. Infrastructure 2026-10-09 8 min 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 How to Create SSH Keys and Connect to a Server (Windows & Linux)Generate SSH keys (ed25519) on Windows, Linux and macOS, copy them to a server, use ~/.ssh/config, add a key to GitHub and fix common SSH errors. 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 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 Bash Scripting Basics: Automate Repetitive Tasks on LinuxBash scripting basics for Linux: shebang, set -euo pipefail, quoting, arguments, conditionals, loops, functions, exit codes, logging and shellcheck. 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