API loadbalancer type Internal does not work on openstack

[networkhell]

/kind bug

1. What kops version are you running?

kops version
Client version: 1.30.1

2. What Kubernetes version are you running?

kubectl version
Client Version: v1.31.1
Kustomize Version: v5.4.2
Server Version: v1.30.5

3. What cloud provider are you using?
Openstack

4. What commands did you run? What is the simplest way to reproduce this issue?

kops create -f kops-test-fh.k8s.local.yaml --state swift://kops
kops create secret --name kops-test-fh.k8s.local sshpublickey admin -i ~/.ssh/id_kops.pub --state swift://kops
kops update cluster --name kops-test-fh.k8s.local --yes --state swift://kops

5. What happened after the commands executed?

kubectl cluster-info
Kubernetes control plane is running at https://31.172.*.*
CoreDNS is running at https://31.172.*.*/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
KubeDNSUpstream is running at https://31.172.*.*/api/v1/namespaces/kube-system/services/kube-dns-upstream:dns/proxy

6. What did you expect to happen?
As the api spec looks like:

spec:
  api:
    loadBalancer:
      type: Internal
      useForInternalApi: true

I expect kops to not allocate a floating ip for the api loadbalancer. Also kops should configure kubernetes to use the internal loadbalancer IP as API endpoint.

7. Please provide your cluster manifest.

apiVersion: kops.k8s.io/v1alpha2
kind: Cluster
metadata:
  creationTimestamp: "2024-09-23T09:47:20Z"
  name: kops-test-fh.k8s.local
spec:
  addons:
  - manifest: swift://kops-addons/addon.yaml
  api:
    loadBalancer:
      type: Internal
      useForInternalApi: true
  authorization:
    rbac: {}
  certManager:
    enabled: true
  channel: stable
  cloudConfig:
    openstack:
      blockStorage:
        bs-version: v3
        clusterName: kops-test-fh.k8s.local
        createStorageClass: false
        csiTopologySupport: true
        ignore-volume-az: false
      loadbalancer:
        floatingNetwork: external
        floatingNetworkID: ***
        method: ROUND_ROBIN
        provider: amphora
        useOctavia: true
      monitor:
        delay: 15s
        maxRetries: 3
        timeout: 10s
      router:
        externalNetwork: external
  cloudControllerManager:
    clusterName: kops-test-fh.k8s.local
  cloudProvider: openstack
  configBase: swift://kops/kops-test-fh.k8s.local
  etcdClusters:
  - cpuRequest: 200m
    etcdMembers:
    - instanceGroup: control-plane-muc5-a
      name: a
      volumeType: rbd_fast
    - instanceGroup: control-plane-muc5-b
      name: b
      volumeType: rbd_fast
    - instanceGroup: control-plane-muc5-d
      name: c
      volumeType: rbd_fast
    manager:
      backupInterval: 24h0m0s
      backupRetentionDays: 90
      env:
      - name: ETCD_LISTEN_METRICS_URLS
        value: http://0.0.0.0:8081
      - name: ETCD_METRICS
        value: basic
    memoryRequest: 100Mi
    name: main
  - cpuRequest: 100m
    etcdMembers:
    - instanceGroup: control-plane-muc5-a
      name: a
      volumeType: rbd_fast
    - instanceGroup: control-plane-muc5-b
      name: b
      volumeType: rbd_fast
    - instanceGroup: control-plane-muc5-d
      name: c
      volumeType: rbd_fast
    manager:
      backupRetentionDays: 90
    memoryRequest: 100Mi
    name: events
  iam:
    allowContainerRegistry: true
    legacy: false
  kubeAPIServer:
    anonymousAuth: false
    tlsCipherSuites:
    - TLS_AES_128_GCM_SHA256
    - TLS_AES_256_GCM_SHA384
    - TLS_CHACHA20_POLY1305_SHA256
    - TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
    - TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
    - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
    - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
    - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
    - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
    - TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305
    - TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
    tlsMinVersion: VersionTLS13
  kubeDNS:
    nodeLocalDNS:
      cpuRequest: 25m
      enabled: true
      memoryRequest: 5Mi
    provider: CoreDNS
  kubeProxy:
    enabled: false
  kubelet:
    anonymousAuth: false
  kubernetesApiAccess:
  - 0.0.0.0/0
  - ::/0
  kubernetesVersion: 1.30.5
  metricsServer:
    enabled: true
    insecure: false
  networkCIDR: 10.42.42.0/24
  networking:
    calico:
      bpfEnabled: true
      encapsulationMode: vxlan
      wireguardEnabled: true
  nonMasqueradeCIDR: 100.64.0.0/10
  sshAccess:
  - 0.0.0.0/0
  - ::/0
  subnets:
  - cidr: 10.42.42.64/26
    name: muc5-a
    type: Private
    zone: muc5-a
  - cidr: 10.42.42.128/26
    name: muc5-b
    type: Private
    zone: muc5-b
  - cidr: 10.42.42.192/26
    name: muc5-d
    type: Private
    zone: muc5-d
  - cidr: 10.42.42.0/29
    name: utility-muc5-a
    type: Utility
    zone: muc5-a
  - cidr: 10.42.42.8/29
    name: utility-muc5-b
    type: Utility
    zone: muc5-b
  - cidr: 10.42.42.16/29
    name: utility-muc5-d
    type: Utility
    zone: muc5-d
  topology:
    dns:
      type: None

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: "2024-09-27T08:44:39Z"
  labels:
    kops.k8s.io/cluster: kops-test-fh.k8s.local
  name: bastions
spec:
  associatePublicIp: true
  image: Debian 12
  machineType: SCS-2V-8-20s
  maxSize: 1
  minSize: 1
  role: Bastion
  subnets:
  - utility-muc5-a

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: "2024-09-23T09:47:20Z"
  labels:
    kops.k8s.io/cluster: kops-test-fh.k8s.local
  name: control-plane-muc5-a
spec:
  image: flatcar
  machineType: SCS-2V-8-20s
  maxSize: 1
  minSize: 1
  role: Master
  subnets:
  - muc5-a

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: "2024-09-23T09:47:20Z"
  labels:
    kops.k8s.io/cluster: kops-test-fh.k8s.local
  name: control-plane-muc5-b
spec:
  image: flatcar
  machineType: SCS-2V-8-20s
  maxSize: 1
  minSize: 1
  role: Master
  subnets:
  - muc5-b

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: "2024-09-23T09:47:20Z"
  labels:
    kops.k8s.io/cluster: kops-test-fh.k8s.local
  name: control-plane-muc5-d
spec:
  image: flatcar
  machineType: SCS-2V-8-20s
  maxSize: 1
  minSize: 1
  role: Master
  subnets:
  - muc5-d

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: "2024-09-23T09:47:21Z"
  labels:
    kops.k8s.io/cluster: kops-test-fh.k8s.local
  name: nodes-muc5-a
spec:
  image: flatcar
  machineType: SCS-2V-8-20s
  maxSize: 1
  minSize: 1
  role: Node
  subnets:
  - muc5-a

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: "2024-09-23T09:47:21Z"
  labels:
    kops.k8s.io/cluster: kops-test-fh.k8s.local
  name: nodes-muc5-b
spec:
  image: flatcar
  machineType: SCS-2V-8-20s
  maxSize: 1
  minSize: 1
  role: Node
  subnets:
  - muc5-b

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: "2024-09-23T09:47:21Z"
  labels:
    kops.k8s.io/cluster: kops-test-fh.k8s.local
  name: nodes-muc5-d
spec:
  image: flatcar
  machineType: SCS-2V-8-20s
  maxSize: 1
  minSize: 1
  role: Node
  subnets:
  - muc5-d

8. Please run the commands with most verbose logging by adding the -v 10 flag.
Paste the logs into this report, or in a gist and provide the gist link here.
I will provide this if it is useful for troubleshooting. Because it will take some time to redact the massive amount of log outputs.

[networkhell]

I did some more research and it seems kind of work when using public DNS - but then kops does not set the DNS records, I have to set it manually:

  topology:
    dns:
      type: Public

The problem ist that the DNS record for api.internal. is never created. If I create it by hand then all nodes join the cluster.
So am I missing some essential config node or is it a bug?

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle stale
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale