Linux Labs

Navigation: find a file in a tree Search an unfamiliar directory tree for a file by name and record its path. First steps ~10 min not started

First steps ~10 min not started

Finish a project skeleton Directories and files on top of a skeleton a colleague started, without losing their work. First steps ~12 min not started

First steps ~12 min not started

Copy and move files Backup copies of configs, a new name for the notes and a directory move — cp and mv. First steps ~12 min not started

First steps ~12 min not started

Tidy up a directory Clear out what a build left behind and put the files in their places without losing the working data. First steps ~15 min not started

First steps ~15 min not started

View and search inside files The end of a nightly log, its error lines and their count, each in its own file: tail and grep. First steps ~15 min not started

First steps ~15 min not started

Count the errors in the logs A summary of the night's error codes from the shop logs: a pipeline into a file, the command's errors into another one, the history appended. First steps ~20 min not started

First steps ~20 min not started

Command not found User deploy suddenly cannot find even ls. Give the commands back so the fix survives a new login. First steps ~15 min not started

First steps ~15 min not started

Wrong file permissions The app service won't start after moving to a new server. Find where it is denied access and fix the permissions without opening anything extra. Users, permissions, and processes ~15 min not started

Users, permissions, and processes ~15 min not started

Grant sudo to a user The new administrator deploy needs sudo rights. Set up access the proper, safe way. Users, permissions, and processes ~10 min not started

Users, permissions, and processes ~10 min not started

Suspend a user account An employee is handing over their work. Block password and key logins to their account while keeping its data and running process. Users, permissions, and processes ~20 min not started

Users, permissions, and processes ~20 min not started

Upgrade a package without losing its setting Release 2.0-1 of a training reporter is approved and its archives are on the machine. Upgrade the program and its dependency without losing the local setting or the note. Packages, services, and logs ~25 min not started

Packages, services, and logs ~25 min not started

Service doesn't come up after reboot After a planned reboot the demo-web service did not come back by itself. Make sure the next reboot does not take it down. Packages, services, and logs ~10 min not started

Packages, services, and logs ~10 min not started

Fix nginx The nginx site stopped opening after yesterday's work. Find the cause and bring the site back. Packages, services, and logs ~15 min not started

Packages, services, and logs ~15 min not started

Cron job isn't running A job in root's schedule should mark a file every minute, but the file never appears. Find out why and make cron write it. Packages, services, and logs ~15 min not started

Packages, services, and logs ~15 min not started

Netplan: restore the link to the neighbour The training interface lab0 is up, yet the neighbour 192.0.2.1 does not answer. Find the cause and fix the persistent network configuration without touching anything else. Networking ~25 min not started

Networking ~25 min not started

Internal names do not resolve The name app.internal does not resolve, although the DNS server runs on this very machine. Find out why the system does not ask it and fix that. Networking ~15 min not started

Networking ~15 min not started

Root partition is full A service stopped saving data: the disk is full. Find what took the space and free it without touching the service's data. Storage ~15 min not started

Storage ~15 min not started