Live Outage Incident Simulator
DevOps Production Incident Response
Real Linux server failures under on-call pressure. Inspect live logs in an isolated Ubuntu container, diagnose root causes, execute fixes, and trigger automated test verification.
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INC-101
Incident #101: Web Server 502 Bad Gateway & File Permissions
Target: Production Web Tier (Nginx / Node API on Ubuntu 24.04)
Architecture Topology
Internet Traffic ➔ Nginx Reverse Proxy (Port 80) ➔ Static Web Assets in /var/www/html ➔ Node API
Outage Symptom:
HTTP 502 Bad Gateway on all customer API requests. Log indicates static HTML asset cannot be read.
Mission Objective:
Inspect /var/log/nextdevops/app.log, locate the unreadable asset in /var/www/html, fix permissions using chmod, and verify the service works.
Progressive Hint SystemUnlock if stuck
Tier 1: Diagnostic Direction
Inspect the recent error logs using: `cat /var/log/nextdevops/app.log` or `grep "CRITICAL" /var/log/nextdevops/app.log`.
Tier 2: Root Cause Analysis
Reveals the exact failure mechanism in the logs.
Tier 3: Exact Fix Solution
Provides the exact terminal command to resolve the incident.
Live Isolated Container SandboxDocker Ubuntu 24.04
Allocating Sandbox Instance...
Provisioning isolated Ubuntu container & injecting outage scenario
Suggested Diagnostic Commands: