Tag: ubuntu

Rootless Docker: Run Without Root

Run Docker containers without root privileges — here's the security difference, the install steps, and the gotchas nobody tells you about.

Adding Extra Swap to Linux

Out of RAM and no time to reimage? Add swap via a file on any partition using mkswap, swapon, and fstab — done in under 5 minutes.

Remove all old installed but unused kernels

Old kernels pile up in /boot and eat disk space — safely remove unused kernels on Ubuntu and Debian with apt and dpkg.

Optimize Ubuntu Logs: btmp Log Rotation

btmp logs failed logins and grows forever on internet-facing servers. Set up logrotate to keep it under control before your disk fills up.

Switch Ubuntu to Hardware Enablement (HWE)

The Ubuntu HWE kernel brings newer hardware support to LTS releases — how to switch from generic to HWE and what you gain.

Ubuntu Debian packages have been kept back error

Packages have been kept back during apt upgrade — what it means, why it happens, and how to safely install or hold those packages.

Update a Single Package Using APT

Update one package with apt without upgrading everything else — the exact flag, version pinning, held package handling, and the apt vs apt-get distinction that trips people up.

UFW Basics: Setting Up Your Linux Firewall

UFW makes iptables manageable — allow and deny rules, app profiles, default policies, and the 5-minute setup for any new Linux server.

User and Group Management in Linux

Create, modify, and delete users and groups on Linux — useradd, usermod, groupadd, sudo access, and /etc/passwd explained.

Set the Timezone in Ubuntu with timedatectl

Set, verify, and sync your timezone in Ubuntu using timedatectl — one command to fix the clock on a newly provisioned server.

Install docker on Ubuntu/Debian

The official, no-nonsense way to install Docker Engine on Ubuntu and Debian — repository setup, key import, and one command to verify it works.

Ubuntu & Bash tutorial & basic utilities

Essential bash utilities for Ubuntu newcomers — file management, text processing, process control, and the commands you'll type every day.