Hetzner: error running task "ServerGroup/bastions": Field is required: UserData

[skuethe]

/kind bug

1. What kops version are you running? The command kops version, will display this information.

Client version: 1.29.0 (git-v1.29.0)

2. What Kubernetes version are you running? kubectl version will print the version if a cluster is running or provide the Kubernetes version specified as a kops flag.

v1.29.3

3. What cloud provider are you using?

Hetzner

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

• kops create -f kops.yaml
• kops update cluster --name kops.hetznerpoc.mydomain.net --yes

5. What happened after the commands executed?

Error while setting up the bastion host:

W0604 10:18:59.832186   23422 executor.go:141] error running task "ServerGroup/bastions" (9m59s remaining to succeed): Field is required: UserData

6. What did you expect to happen?

A bastion host is being created

7. Please provide your cluster manifest. Execute kops get --name my.example.com -o yaml to display your cluster manifest. You may want to remove your cluster name and other sensitive information.

kops.yaml used with the kops create -f command:

apiVersion: kops.k8s.io/v1alpha2
kind: Cluster
metadata:
  creationTimestamp: null
  name: kops.hetznerpoc.mydomain.net
spec:
  api:
    loadBalancer:
      type: Public
  authorization:
    rbac: {}
  channel: stable
  cloudProvider: hetzner
  configBase: s3://kops/kops.hetznerpoc.mydomain.net
  etcdClusters:
  - cpuRequest: 200m
    etcdMembers:
    - instanceGroup: control-plane-nbg1
      name: etcd-1
    manager:
      backupRetentionDays: 90
    memoryRequest: 100Mi
    name: main
  - cpuRequest: 100m
    etcdMembers:
    - instanceGroup: control-plane-nbg1
      name: etcd-1
    manager:
      backupRetentionDays: 90
    memoryRequest: 100Mi
    name: events
  iam:
    allowContainerRegistry: true
    legacy: false
  kubelet:
    anonymousAuth: false
  kubernetesApiAccess:
  - 0.0.0.0/0
  - ::/0
  kubernetesVersion: v1.29.3
  networkCIDR: 10.2.0.0/24
  networking:
    calico: {}
  nonMasqueradeCIDR: 100.64.0.0/10
  sshAccess:
  - 0.0.0.0/0
  - ::/0
  subnets:
  - name: nbg1
    type: Private
    zone: nbg1
  - name: utility-nbg1
    type: Utility
    zone: nbg1
  topology:
    dns:
      type: None

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: null
  labels:
    kops.k8s.io/cluster: kops.hetznerpoc.mydomain.net
  name: control-plane-nbg1
spec:
  image: ubuntu-22.04
  machineType: cx31
  maxSize: 0
  minSize: 0
  role: Master
  subnets:
  - nbg1

---

apiVersion: kops.k8s.io/v1alpha2
kind: InstanceGroup
metadata:
  creationTimestamp: null
  labels:
    kops.k8s.io/cluster: kops.hetznerpoc.mydomain.net
  name: bastions
spec:
  image: ubuntu-22.04
  machineType: cx11
  maxSize: 1
  minSize: 1
  role: Bastion
  subnets:
  - nbg1

---

apiVersion: kops.k8s.io/v1alpha2
kind: SSHCredential
metadata:
  creationTimestamp: null
  labels:
    kops.k8s.io/cluster: kops.hetznerpoc.mydomain.net
  name: admin
spec:
  publicKey: ssh-ed25519 ...

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 pasted only the (hopefully) relevant log section where the "UserData" is set to null. If other log output is required I would need to remove sensitive information first.

I0604 10:28:06.720121   23985 executor.go:113] Tasks: 44 done / 45 total; 1 can run
I0604 10:28:06.720279   23985 executor.go:214] Executing task "ServerGroup/bastions": *hetznertasks.ServerGroup {"Name":"bastions","Lifecycle":"Sync","SSHKeys":[{"Name":"kops.hetznerpoc.mydomain.net-...","Lifecycle":"Sync","ID":21122430,"PublicKey":"ssh-ed25519 ...","Labels":{"kops.k8s.io/cluster":"kops.hetznerpoc.mydomain.net"}}],"Network":{"Name":"kops.hetznerpoc.mydomain.net","Lifecycle":"Sync","ID":"4301340","Region":"eu-central","IPRange":"10.2.0.0/24","Subnets":["10.2.0.0/24"],"Labels":{"kops.k8s.io/cluster":"kops.hetznerpoc.mydomain.net"}},"Count":1,"NeedUpdate":null,"Location":"nbg1","Size":"cx11","Image":"ubuntu-22.04","EnableIPv4":true,"EnableIPv6":false,"UserData":null,"Labels":{"kops.k8s.io/cluster":"kops.hetznerpoc.mydomain.net","kops.k8s.io/instance-group":"bastions","kops.k8s.io/instance-role":"Bastion"}}
W0604 10:28:07.063966   23985 executor.go:141] error running task "ServerGroup/bastions" (9m45s remaining to succeed): Field is required: UserData
I0604 10:28:07.064088   23985 executor.go:171] Continuing to run 1 task(s)

9. Anything else do we need to know?

Trying to setup a cluster with private topology and bastion host on Hetzner. I specifically set the control plane size to 0 to focus on the Bastion deployment. That being said, I of course also tried the deployment with an existing control plane InstanceGroup. The behaviour is the same.

By reading the documentation I was under the impression that the bastion feature should already work with Hetzner. So creating this as a kind: bug.