Finding events in an Ubuntu server’s logs starts with a way to collect and search them. The ELK stack is a log-analysis system that uses Elasticsearch to search indexed documents, with other components for processing events and exploring the results. I’ll show you how to install the three packages from Elastic’s signed APT repository and
install elk stack on Ubuntu Read More »
A game file on Linux still needs software that can run the system it came from. RetroArch provides menus and shared settings for emulator modules called cores, and each core runs content for a particular system. This guide shows how to install RetroArch from Flathub and use a core to load game content. TL;DR Install
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A download script may need to use a particular type of IP address each time it runs. Wget can restrict a request to IPv4 or IPv6, or try one family first while leaving the other available. This article shows how to check both families and choose between a one-request option and a setting that applies
wget ipv4: Force Wget to Use IPv4 or IPv6 Read More »
A backup file needs to stay readable to you while its contents remain protected from someone who finds the copy. GPG is a command-line program that creates a passphrase-protected file you can decrypt later. This article shows how to encrypt a file and restore it under a chosen name. It also explains what to check
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Before updating a Java application on Linux, identify which Log4j version it uses. Apache Log4j is a Java logging library that an application can include as a dependency. I’ll show you how to check package records and a JAR manifest, then update the package or application dependency that owns the copy. TL;DR: Check Log4j in
How to Check and Update Your Log4J Version on Linux? Read More »
A new person who needs to sign in needs an account on the Linux system first. The adduser and useradd commands create accounts, and useradd can create a home directory when you request one. I’ll show how to create and verify an account, then add supplementary group access without replacing existing memberships. TL;DR: Add a
Add User Linux: Create Accounts and Set Access Read More »
A Snap app from the Snap Store needs snapd available and running on your Linux system before you can install it. Snap is an application package, and snapd is the background service that manages Snap installations. I’ll show you how to set up snapd for your distribution, then install an app. TL;DR Install snapd for
Install Snap on Linux: snapd and Apps Read More »
A hostname change can leave your Ubuntu computer using an earlier address. Ubuntu’s systemd-resolved service can store DNS answers in a local cache, and resolvectl can clear that cache. I’ll show how to check which resolver is active and flush systemd-resolved’s local cache. TL;DR On Ubuntu using systemd-resolved, run sudo resolvectl flush-caches to clear its
Clear DNS Cache on Ubuntu Read More »
You have Windows and want to add openSUSE without setting up a traditional dual-boot system. WSL 2 runs Linux alongside Windows in a managed virtual machine, and openSUSE provides the Linux environment. This guide walks through installing openSUSE with WSL and checking its WSL version. TL;DR Install WSL from an elevated PowerShell window, find the
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A new Windows setup may leave you looking for a way to use Ubuntu without replacing Windows. WSL runs Linux distributions alongside Windows, and Ubuntu is one distribution you can install there. I’ll show you how to install WSL with Ubuntu and check which WSL version the distribution uses. TL;DR On a supported Windows build,
WSL Ubuntu Install: Set Up Ubuntu on Windows Read More »