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tasks.md

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+# Practice Exam - Betriebssysteme und Netzwerke
+
+## Exam Information
+
+- **Duration:** 45 minutes
+- **Tasks:** 5 problems to diagnose and fix
+- **Allowed:** 1x A4 cheat sheet (front and back)
+
+---
+
+## Scenario
+
+You are a system administrator for a company. Multiple services on the server have stopped working after a colleague made some changes. Your task is to diagnose and fix all issues.
+
+---
+
+## Task 1: Company Portal Unreachable
+
+**Service:** http://company.local
+
+**Problem:** The company portal website is not loading. Users report seeing an error page or the page won't load at all.
+
+**Expected Result:** The website should display "Company Portal" with "Status: Online"
+
+**Test Command:**
+```bash
+curl http://company.local
+```
+
+**Category:** Web Server Configuration
+
+---
+
+## Task 2: Online Shop Shows 403 Forbidden
+
+**Service:** http://shop.local
+
+**Problem:** The online shop returns a "403 Forbidden" error when accessed.
+
+**Expected Result:** The website should display "Online Shop" with "Status: Online"
+
+**Test Command:**
+```bash
+curl http://shop.local
+```
+
+**Category:** File System Permissions
+
+---
+
+## Task 3: API Returns 502 Bad Gateway
+
+**Service:** http://api.local:8080
+
+**Problem:** The REST API returns a "502 Bad Gateway" error instead of JSON data.
+
+**Expected Result:** The API should return a JSON response with `"status": "success"`
+
+**Test Command:**
+```bash
+curl http://api.local:8080
+```
+
+**Category:** Service Management (systemd)
+
+---
+
+## Task 4: Docker Application Unreachable
+
+**Service:** http://localhost:8888
+
+**Problem:** The Docker web application running on port 8888 is not accessible. The connection times out.
+
+**Expected Result:** The page should display "Docker Application" running in a container.
+
+**Test Command:**
+```bash
+curl http://localhost:8888
+```
+
+**Hint:** The Docker container itself is running correctly.
+
+**Category:** Firewall (UFW)
+
+---
+
+## Task 5: Database Connection Refused
+
+**Service:** MySQL Database
+
+**Problem:** The web application cannot connect to the MySQL database. Connection attempts with the `webuser` account are being refused.
+
+**Credentials:**
+- Username: `webuser`
+- Password: `WebPass123!`
+- Database: `practicedb`
+
+**Expected Result:** Should be able to connect and query the database.
+
+**Test Command:**
+```bash
+mysql -u webuser -p'WebPass123!' practicedb -e "SELECT * FROM products;"
+```
+
+**Category:** Database Administration
+
+---
+
+## Verification
+
+Run the verification script to check your progress:
+
+```bash
+sudo ./break_server.sh
+# Then select option 7) Verify all services
+```
+
+Or test each service manually with the curl commands above.
+
+---
+
+## Diagnostic Commands Reference
+
+| Tool | Purpose |
+|------|---------|
+| `systemctl status <service>` | Check service status |
+| `systemctl start/restart <service>` | Start or restart service |
+| `nginx -t` | Test nginx configuration |
+| `journalctl -u <service>` | View service logs |
+| `ufw status` | Check firewall rules |
+| `ss -tulnp` | Show listening ports |
+| `ls -la <path>` | Check file permissions |
+| `docker ps` | List running containers |
+| `cat /var/log/nginx/error.log` | View nginx error logs |
+
+---
+
+## Good Luck!
+
+Remember to work systematically:
+1. Identify the symptom
+2. Check service status
+3. Review configuration/logs
+4. Apply the fix
+5. Verify the solution
+
+---
+
+*Practice Exam - Betriebssysteme und Netzwerke*