Troubleshooting Scenarios

apache bash caddy csv disk volumes dns docker etcd git gunicorn hack haproxy java json kubernetes mysql nginx postgres rabbitmq sql ssh ssl supervisord
realistic / interviews new pro

Easy

# Name Time Type
1 "Saint John": what is writing to this log file? 10 m Fix No Registration
2 "Saskatoon": counting IPs. 15 m Do
3 "The Command Line Murders" 20 m Do No Registration
4 "Taipei": Come a-knocking 15 m Hack
5 "Resumable Server": Linux Upskill Challenge 30 m Do
6 "Lhasa": Easy Math 15 m Do
7 "Bucharest": Connecting to Postgres 10 m Fix
8 "Bilbao": Basic Kubernetes Problems 10 m Fix
9 "Apia": Needle in a Haystack 20 m Do Pro
10 "Gitega": Find the Bad Git Commit 15 m Do Pro
11 "Minneapolis": Break a CSV file 10 m Do
12 "Saint Paul": Merge Many CSVs files 15 m Do
13 "Bata": Find in /proc 10 m Do
14 "Geneva": Renew an SSL Certificate 10 m Fix
15 Linux Server Review - Guided Learning 30 m Do
16 "Tokamachi": Troubleshooting a Named Pipe 15 m Fix New
17 "Yokohama": Linux Users Working Together 15 m Fix New

Medium

# Name Time Type
18 "Manhattan": can't write data into database. 20 m Fix No Registration
19 "Tokyo": can't serve web file 15 m Fix
20 "Cape Town": Borked Nginx 15 m Fix
21 "Salta": Docker container won't start. 15 m Fix
22 "Venice": Am I in a container? 15 m Do
23 "Oaxaca": Close an Open File 15 m Fix
24 "Melbourne": WSGI with Gunicorn 20 m Fix Pro
25 "Lisbon": etcd SSL cert troubles 20 m Fix
26 "Kihei": Surely Not Another Disk Space Scenario 30 m Fix
27 "Unimak Island": Fun with Mr Jason 15 m Do Pro
28 "Ivujivik": Parlez-vous Français? 20 m Do Pro
29 "Paris": Where is my webserver? 15 m Hack
30 "Buenos Aires": Kubernetes Pod Crashing 20 m Fix
31 "Tarifa": Between Two Seas 20 m Fix Pro
32 "Marrakech": Word Histogram 20 m Do
33 "Rosario": Restore a MySQL database 15 m Fix
34 "Abaokoro": Restore MySQL Databases Spooked by a Ghost 20 m Fix Pro
35 "Poznań": Helm Chart Issue in Kubernetes 15 m Fix Pro
36 "Manado": How much do you press? 30 m Do Pro
37 "Warsaw": Prometheus can't scrape the webserver 30 m Fix Pro
38 "Moyogalpa": Security Snag. The Trials of Mary and John 30 m Fix
39 "Helsingør": The first walls of postgres physical replication 20 m Fix
40 "Bekasi": Supervisor is still around 20 m Fix
41 "Depok": Nginx with Brotli 15 m Fix Pro
42 "Tukaani": XZ LZMA Library Compromised 15 m Fix Pro
43 "Atrani": Modify a SQlite3 Database 15 m Fix Pro
44 "Minneapolis with a Vengeance": Break a CSV file 20 m Do
45 "Hanoi": Find the Multitasking Users 15 m Do Pro
46 "Batumi": Troubleshoot "A" cannot connect to "B" 20 m Fix
47 "Bengaluru": Kubernetes StatefulSet least known characteristic 15 m Fix New

Hard

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# Name Time Type
48 "Jakarta": it's always DNS. 20 m Fix No Registration
49 "Bern": Docker web container can't connect to db container. 20 m Fix
50 "Karakorum": WTFIT – What The Fun Is This? 20 m Fix Pro
51 "Singara": Docker and Kubernetes web app not working. 20 m Fix
52 "Hong-Kong": can't write data into database. 20 m Fix
53 "Pokhara": SSH and other sshenanigans 30 m Fix Pro
54 "Roseau": Hack a Web Server 30 m Hack
55 "Belo-Horizonte": A Java Enigma 20 m Fix Pro
56 "Chennai": Pull a Rabbit from a Hat 30 m Fix Pro
57 "Monaco": Disappearing Trick 30 m Hack
58 "Florence": Database Migration Hell 30 m Fix Pro

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Updated: 2025-02-19 00:36 UTC – 1b1bc7c