{
  "id": "linux-service-inspection",
  "title": "Inspect a Real Running Service",
  "category": "Linux Administration",
  "isolation_type": "shared_namespace",
  "difficulty": "Easy",
  "type": "task",
  "weight": 4,
  "description": "## Inspect a Real Running Service\n\nThis Lab environment is itself served by a real running service: nginx, reverse-proxying the very terminal you're using right now. Answer the four questions every service-administration task starts with, using ONLY inspection commands (do not stop or restart it).\n\n**Your task:**\n\nCreate `/srv/service-lab/report.txt` with exactly three lines:\n\n```\nLISTENING_PORT=<the TCP port nginx is listening on>\nCONFIG_PATH=<the full path to its config file>\nLOG_DIR=<the directory its logs are written to>\n```",
  "hints": [
    {
      "title": "Finding the listening port",
      "body": "`ss -lnt` lists every TCP socket in LISTEN state and the port it's bound to.",
      "command": "ss -lnt"
    },
    {
      "title": "Finding the config and logs",
      "body": "nginx's config path and log directives are visible right in its own config file.",
      "command": "cat /etc/nginx/nginx.conf | head -10"
    }
  ],
  "setup_commands": [
    { "command": "mkdir -p /srv/service-lab" }
  ],
  "validation": {
    "commands": [
      { "description": "correctly identified the listening port (80)", "command": "cat /srv/service-lab/report.txt | grep '^LISTENING_PORT='", "expected_output": "LISTENING_PORT=80", "match": "exact" },
      { "description": "correctly identified the config path", "command": "cat /srv/service-lab/report.txt | grep '^CONFIG_PATH='", "expected_output": "CONFIG_PATH=/etc/nginx/nginx.conf", "match": "exact" },
      { "description": "correctly identified the log directory", "command": "cat /srv/service-lab/report.txt | grep '^LOG_DIR='", "expected_output": "LOG_DIR=/var/log/nginx", "match": "exact" },
      { "description": "nginx itself was never stopped during this exercise", "command": "pgrep -x nginx >/dev/null && echo still-running || echo stopped", "expected_output": "still-running", "match": "exact" }
    ]
  },
  "default_namespace": "default",
  "teardown_commands": [
    { "command": "rm -rf /srv/service-lab" }
  ]
}