{
  "id": "broken-deployment",
  "title": "Debug a Failing Deployment",
  "category": "Troubleshooting",
  "difficulty": "Medium",
  "type": "task",
  "weight": 8,
  "description": "## Fix the Broken Deployment\n\nA deployment has been pre-created in the `debug` namespace but its pods are not running.\n\n**Your task:** Identify the problem and fix it so that the deployment has **all 3 pods in Ready state**.\n\n> Start by describing the deployment and its pods to find clues about what's wrong.",
  "hints": [
    {
      "title": "Inspect the deployment",
      "body": "Start by listing pods in the debug namespace and describing the failing ones.",
      "command": "kubectl get pods -n debug\nkubectl describe pod -n debug -l app=broken-app"
    },
    {
      "title": "Check events",
      "body": "The Events section in `kubectl describe` usually tells you exactly what's wrong — look for ImagePullBackOff, OOMKilled, or probe failures.",
      "command": "kubectl describe deployment broken-app -n debug"
    },
    {
      "title": "Fix the image tag",
      "body": "If the image tag doesn't exist, update it to a valid one using `kubectl set image`.",
      "command": "kubectl set image deployment/broken-app nginx=nginx:1.25 -n debug"
    }
  ],
  "setup_commands": [
    {
      "command": "kubectl create namespace debug"
    },
    {
      "command": "kubectl create deployment broken-app --image=nginx:invalid-tag-99999 --replicas=3 -n debug"
    }
  ],
  "validation": {
    "description": "Checks that the broken-app deployment in the debug namespace has 3 ready replicas.",
    "commands": [
      {
        "description": "Deployment 'broken-app' has 3 ready replicas",
        "command": "kubectl get deployment broken-app -n debug -o jsonpath='{.status.readyReplicas}' 2>/dev/null | grep -v '^$' || echo 0",
        "expected_output": "3",
        "match": "exact"
      },
      {
        "description": "No pods in ImagePullBackOff state",
        "command": "kubectl get pods -n debug --no-headers 2>/dev/null | awk '{print $3}' | grep -c 'ImagePullBackOff\\|ErrImagePull' || true",
        "expected_output": "0",
        "match": "exact"
      }
    ]
  },
  "default_namespace": "debug",
  "teardown_commands": [
    {
      "command": "kubectl delete namespace debug --ignore-not-found --wait=false"
    }
  ]
}