Why UDP and TCP as separate services?

[paimonsoror]

Hey all, curious about why we have separate services for TCP and UDP? Issue im currently running into is when using cilium as my ingress controller.

cilium/cilium#9207

Any harm in unifying TCP and UDP into a single service?

edit:

Adding the updated Service that combined the TCP/UDP protocols. Without this the UDP service was stuck in a Pending state due to a Cilium bug.

apiVersion: v1
kind: Service
metadata:
  name: pihole-dns-tcp
  namespace: pihole
  resourceVersion: '256055745'
  creationTimestamp: '2024-12-08T15:00:26Z'
  labels:
    app: pihole
    app.kubernetes.io/instance: pihole
    app.kubernetes.io/name: pihole
    chart: pihole-2.27.0
    heritage: Helm
    k8slens-edit-resource-version: v1
    release: pihole
  annotations:
    io.cilium/lb-ipam-ips: 192.168.5.102
    io.cilium/lb-ipam-sharing-key: pi-hole
spec:
  ports:
    - name: dns
      protocol: TCP
      port: 53
      targetPort: dns
      nodePort: 30627
    - name: dns-udp
      protocol: UDP
      port: 53
      targetPort: dns-udp
      nodePort: 32654
  selector:
    app: pihole
    release: pihole
  clusterIP: 10.43.28.34
  clusterIPs:
    - 10.43.28.34
  type: LoadBalancer
  sessionAffinity: None
  externalTrafficPolicy: Local
  healthCheckNodePort: 31066
  ipFamilies:
    - IPv4
  ipFamilyPolicy: SingleStack
  allocateLoadBalancerNodePorts: true
  internalTrafficPolicy: Cluster

[MoJo2600]

This has only historical reasons. I need to change this.