k8scd/gatus/networkpolicy.yaml

# Gatus faces the internet through Envoy, so its pods only reach each
# other, DNS and the internet: not the LAN (NAS, router), the Kubernetes
# API or other namespaces.
# Its checks go to public addresses; alerts go to ntfy in-cluster.
# Ingress comes from Envoy and the node itself (kubelet probes; 10.1.7.64
# is the node's Calico VXLAN address, projectcalico.org/IPv4VXLANTunnelAddr).
# Same layout as mbgwp/networkpolicy.yaml.
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: default
spec:
  podSelector: {}
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - from:
        - podSelector: {}
    - from:
        - ipBlock:
            cidr: 192.168.1.204/32
        - ipBlock:
            cidr: 10.1.7.64/32
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: envoy-gateway-system
          podSelector:
            matchLabels:
              app.kubernetes.io/name: envoy
      ports:
        - port: 8080
  egress:
    - to:
        - podSelector: {}
    - to:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: kube-system
          podSelector:
            matchLabels:
              k8s-app: kube-dns
      ports:
        - protocol: UDP
          port: 53
        - protocol: TCP
          port: 53
    - to:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: ntfy
          podSelector:
            matchLabels:
              app: ntfy
      ports:
        - port: 80
    - to:
        - ipBlock:
            cidr: 0.0.0.0/0
            except:
              - 10.0.0.0/8
              - 100.64.0.0/10
              - 169.254.0.0/16
              - 172.16.0.0/12
              - 192.168.0.0/16
---
# backup-check.yaml reads backups, volumes and Vault's pods from the API
# server (the node, port 16443).
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: backup-check-to-api
spec:
  podSelector:
    matchLabels:
      app: backup-check
  policyTypes:
    - Egress
  egress:
    - to:
        - ipBlock:
            cidr: 192.168.1.204/32
      ports:
        - port: 16443