tmpfs.tech · all tracks · RHEL / Red Hat

Lock Package Versions

RHEL / Red Hat · medium · solved in-browser (no VM needed) · 3 tiered hints

Write /etc/dnf/plugins/versionlock.list pinning two packages, each on its own line in the plugin's fully-qualified NAME-EPOCH:VERSION-RELEASE.ARCH form (the EPOCH and its colon are required): a kernel entry (e.g. kernel-0:5.14.0-362.el9.x86_64) and an nginx entry locked to version 1.20.1 (e.g. nginx-1:1.20.1-14.el9.x86_64). (Authored config, graded structurally — the engine isn't run here.)

▶ Start this challenge

Nobody has solved this one yet — be the first clear on the leaderboard.

How it works

Open the challenge and an in-page editor appears — write your answer and tmpfs.tech grades it server-side against the same checks a real box would run. No VM, no install, no signup needed to try.

More RHEL / Red Hat challenges

Red Hat-family specifics: rpm, dnf, SELinux and packaging.

• Author a dnf Repo Fileeasy · in-browser
• Count a package's fileseasy
• Find a file's owning packageeasy
• Installed package counteasy
• Kernel releaseeasy
• Legacy Network Sysconfigeasy · in-browser
• OS IDeasy
• Pin a Repo GPG Keyeasy · in-browser

See all RHEL / Red Hat challenges →

FAQ

Is it free? Yes — play as a guest, no signup required to start.

Do I need to install anything? No. Everything runs in your browser.

How is it graded? Automatically and deterministically — your work is checked against the exact rules the live box would apply.