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Sad Servers

This repository is a collection of troubleshooting notes for server issues encountered in real-world scenarios. It serves as a reference for developers and system administrators facing similar challenges.


Notes

# Title Tags
1 "Tukaani": XZ LZMA Library Compromised Shared Library
2 "Belo-Horizonte": A Java Enigma Java, Swapping
3 "Florence": Database Migration Hell Database, Migration, Nginx
4 "Constanta": Jumping Frog CTF, Hack, newgrp, SSH
5 "Roseau": Hack a Web Server Hack, Web Server
6 Batumi: Troubleshoot "A" cannot connect to "B" iptables, Postgres, Systemd
7 "Karakorum": WTFIT – What The Fun Is This? File Access Control, Web Server
8 Kihei: Surely Not Another Disk Space Scenario Disk, strace, LVM
9 "Jakarta": it's always DNS DNS, Name Service Switch
10 "Pokhara": SSH and other sshenanigans SSH, User Account
11 "Monaco": Disappearing Trick Environment Variable, Hack, Git
12 "Depok": Nginx with Brotli Nginx, Compression
13 "Moyogalpa": Security Snag. The Trials of Mary and John SSL, DNS, AppArmor
14 Bangalore: Envoy Panics Envoy, Health Check, Forward Proxy, Panic Mode
15 "Minneapolis with a Vengeance": Break a CSV file CSV, Data Processing, Scripting, Min Heap
16 Lisbon: etcd SSL cert troubles etcd, SSL, iptables
17 Tarifa: Between Two Seas Container, HAProxy, Nginx, Load Balancing
18 Melbourne: WSGI with Gunicorn Nginx, Gunicorn, HTTP Header
19 Warsaw: Prometheus can't scrape the webserver Prometheus, Metric, HTTP Method
20 Atrani: Modify a SQlite3 Database SQlite, Database, SQL
21 "Singara": Docker and Kubernetes web app not working. Kubernetes, k3s, Node Port Range
22 Bengaluru: Kubernetes StatefulSet least known characteristic Kubernetes, At Most Once sematic of StatefulSet
23 Helsingør: The first walls of postgres physical replication Postgres, Container, Replica
24 Buenos Aires: Kubernetes Pod Crashing Kubernetes, Role Based Access Control
25 "Bern": Docker web container can't connect to db container. Container, DNS
26 Salta: Docker container won't start. Container, Publishing ports
27 Manhattan: can't write data into database Disk, Systemd, Postgres, Database
28 Tokyo: can't serve web file iptables, File Permissions
29 Cape Town: Borked Nginx Nginx, Max Open File Descriptor Limits
30 "Hong-Kong": can't write data into database. Disk, Database, Postgres
31 Bilbao: Basic Kubernetes Problems Kubernetes, Scheduling
32 "Ivujivik": Parlez-vous Français? SQL, Data Processing, CSV
33 Bucharest: Connecting to Postgres Postgres, Database
34 "Manado": How much do you press? Compression
35 Geneva: Renew an SSL Certificate SSL, Reverse Proxy
36 Taipei: Come a-knocking Port Knocking
37 Tokamachi: Troubleshooting a Named Pipe Named Pipe, File Locking
38 Gitega: Find the Bad Git Commit Git
39 Saint John: what is writing to this log file? List Of Open File
40 Oaxaca: Close an Open File List Of Open File
41 Saskatoon: counting IPs Data Processing
42 Hanoi: Find the Multitasking Users Bash
43 Marrakech: Word Histogram Bash
44 "Bekasi": Supervisor is still around Environment Variable
45 Apia: Needle in a Haystack Diff, Checksum
46 Paris: Where is my webserver? Hack
47 Yokohama: Linux Users Working Together Bash, Append-Only File
48 Lhasa: Easy Math Scripting
49 Unimak Island: Fun with Mr Jason json, Data Processing
50 Bata: Find in /proc Data Processing
51 Minneapolis: Break a CSV file CSV, Data Processing
52 Venice: Am I in a container? Container
53 Saint Paul: Merge Many CSVs files CSV, Data Processing
54 "Rosario": Restore a MySQL database MySQL, Database, Backup
55 "Abaokoro": Restore MySQL Databases Spooked by a Ghost MySQL, Database, Backup
56 "Chennai": Pull a Rabbit from a Hat RabbitMQ, Environment Variables, Access Control
57 Bharuch: "Lost in Translation" Container, CPU Architecture, Emulator
58 "Quito": Control One Container from Another Container, Mount
59 "Budapest": User Creation Bash
60 "Tokelau": Delete from history Bash
61 "Zaragoza": Test changing critical files Mount
62 "Fukuoka": Forbidden Association Nginx
63 "Poznań": Helm Chart Issue in Kubernetes Helm, Kubernetes
64 "Bizerte": The Slow Application Performance, Redis, Cache
65 "Ruaka": Kubernetes pod in distress Kubernetes, Helm
66 "Campina Grande": Give me my cert, Vault Hashicorp Vault, PKI
67 Kampot: "A New Port" Nginx
68 "Kampala": Strange Script Error Dos2Unix
69 "Bondo: Split my pile! Disk, Inode
70 "Atlantis": Not found Multi-Stage Build, C library
71 "Amygdala": Do you have enough insight to see the secrets? Kubernetes, Vault
72 "Nuuk": More SSH Troubles SSH

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Master Linux & DevOps troubleshooting on live servers. Real Challenges. Real Infra. Real Skills.

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