# Nessus Vulnerability Scanner Deployment
# Optimized for low resource usage in constrained environments
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nessus
  namespace: nessus
  labels:
    app: nessus
    app.kubernetes.io/name: nessus
    app.kubernetes.io/component: security-scanner
spec:
  replicas: 1
  strategy:
    type: Recreate  # Only one instance can mount the PVC at a time
  selector:
    matchLabels:
      app: nessus
  template:
    metadata:
      labels:
        app: nessus
      annotations:
        # Reloader auto-restart when secrets change
        secret.reloader.stakater.com/reload: "nessus-admin-credentials"
    spec:
      containers:
        - name: nessus
          image: docker.io/tenable/nessus:10.8.3-ubuntu
          imagePullPolicy: IfNotPresent
          
          # Low resource configuration for constrained environments
          resources:
            requests:
              memory: "1Gi"
              cpu: "50m"
            limits:
              memory: "2Gi"
          
          ports:
            - name: https
              containerPort: 8834
              protocol: TCP
          
          # Environment variables for Nessus configuration
          env:
            # Admin credentials from Vault (via ESO)
            - name: USERNAME
              valueFrom:
                secretKeyRef:
                  name: nessus-admin-credentials
                  key: NESSUS_USERNAME
            - name: PASSWORD
              valueFrom:
                secretKeyRef:
                  name: nessus-admin-credentials
                  key: NESSUS_PASSWORD
            
            # Auto-update settings (plugins only to save bandwidth/time)
            - name: AUTO_UPDATE
              value: "plugins"
          
          # Volume mounts for persistent data
          volumeMounts:
            - name: nessus-data
              mountPath: /opt/nessus/var/nessus
          
          # Startup probe - give Nessus time to initialize
          startupProbe:
            httpGet:
              path: /
              port: 8834
              scheme: HTTPS
            initialDelaySeconds: 60
            periodSeconds: 15
            timeoutSeconds: 5
            failureThreshold: 60  # 15 minutes total startup time
          
          # Liveness probe
          livenessProbe:
            httpGet:
              path: /
              port: 8834
              scheme: HTTPS
            initialDelaySeconds: 300
            periodSeconds: 30
            timeoutSeconds: 10
            failureThreshold: 5
          
          # Readiness probe
          readinessProbe:
            httpGet:
              path: /
              port: 8834
              scheme: HTTPS
            initialDelaySeconds: 120
            periodSeconds: 15
            timeoutSeconds: 5
            failureThreshold: 5
          
          # Security context
          securityContext:
            allowPrivilegeEscalation: false
            runAsNonRoot: false  # Nessus requires root
            capabilities:
              drop:
                - ALL
              add:
                - NET_ADMIN  # Required for network scanning
                - NET_RAW    # Required for raw socket scanning
      
      volumes:
        - name: nessus-data
          persistentVolumeClaim:
            claimName: nessus-data

---
apiVersion: v1
kind: Service
metadata:
  name: nessus
  namespace: nessus
  labels:
    app: nessus
spec:
  type: ClusterIP
  ports:
    - name: https
      port: 8834
      targetPort: 8834
      protocol: TCP
  selector:
    app: nessus