apiVersion: apps/v1
kind: Deployment
metadata:
  name: k8s-mgmt-pod
spec:
  replicas: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app.kubernetes.io/name: k8s-mgmt-pod
  template:
    metadata:
      labels:
        app.kubernetes.io/name: k8s-mgmt-pod
    spec:
      serviceAccountName: k8s-mgmt-pod
      automountServiceAccountToken: true
      securityContext:
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: k8s-mgmt-pod
          # Replace this placeholder with a pinned tag or digest in production.
          image: ghcr.io/<org>/<repo>/k8s-mgmt-pod:latest
          imagePullPolicy: IfNotPresent
          ports:
            - name: ssh
              containerPort: 22
              protocol: TCP
            - name: webssh
              containerPort: 3000
              protocol: TCP
          env:
            - name: ADMIN_SSH_PUBKEY
              valueFrom:
                secretKeyRef:
                  name: k8s-mgmt-pod-auth
                  key: ADMIN_SSH_PUBKEY
                  optional: true
            - name: USER_SSH_PUBKEY
              valueFrom:
                secretKeyRef:
                  name: k8s-mgmt-pod-auth
                  key: USER_SSH_PUBKEY
                  optional: true
            - name: ADMIN_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: k8s-mgmt-pod-auth
                  key: ADMIN_PASSWORD
                  optional: true
            - name: USER_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: k8s-mgmt-pod-auth
                  key: USER_PASSWORD
                  optional: true
          resources:
            requests:
              cpu: 100m
              memory: 256Mi
            limits:
              cpu: 500m
              memory: 512Mi
          readinessProbe:
            tcpSocket:
              port: 22
            initialDelaySeconds: 5
            periodSeconds: 10
          livenessProbe:
            tcpSocket:
              port: 22
            initialDelaySeconds: 15
            periodSeconds: 20
          volumeMounts:
            - name: state
              mountPath: /var/lib/k8s-mgmt-pod
          securityContext:
            # sshd still runs as root here because it needs to bind port 22 and switch to the authenticated user session.
            # The tradeoff is deliberate: keep the container functional, then narrow capabilities instead of forcing a fragile rootless sshd setup.
            runAsUser: 0
            runAsGroup: 0
            runAsNonRoot: false
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: false
            capabilities:
              drop: ["ALL"]
              add: ["CHOWN", "DAC_OVERRIDE", "FOWNER", "NET_BIND_SERVICE", "SETGID", "SETUID"]
      volumes:
        - name: state
          emptyDir: {}