SSH public key must be specified when running with Scaleway

Error message

SSH public key must be specified when running with Scaleway (create with `kops create secret --name %s sshpublickey admin -i ~/.ssh/id_rsa.pub`)

What it means

When applying a Scaleway cluster, kOps requires an SSH public key secret named 'admin' to exist. In apply_cluster.go Run, if the loaded sshPublicKeys map is empty, the apply fails with instructions on how to create the key. Scaleway provisioning injects this key into instances, so it must be present.

Solutions

Create the key: `kops create secret --name <cluster> sshpublickey admin -i ~/.ssh/id_rsa.pub` then rerun update
If the file is elsewhere, pass its path with -i (must be a public key, e.g. .pub file)
Confirm with `kops get secrets` that the sshpublickey entry now exists

Example fix

// before: no ssh key secret
kops create secret --name scw.example.com sshpublickey admin -i ~/.ssh/id_rsa.pub
// after: key exists; kops update cluster proceeds

Defensive patterns

Strategy: validation

Validate before calling

kops get secrets --name "$CLUSTER" | grep -q sshpublickey || kops create secret --name "$CLUSTER" sshpublickey admin -i ~/.ssh/id_rsa.pub

Try / catch

if err := updateCluster(); err != nil { if strings.Contains(err.Error(), "SSH public key must be specified") { createAdminKey(); retry() } return err }

Prevention

Always run `kops create secret ... sshpublickey admin` right after `kops create cluster` for scaleway
Script cluster bootstrap to include the key step
Verify key presence with `kops get secrets` before updates

When it happens

Trigger: `kops update cluster` on a scaleway cluster where no 'sshpublickey admin' secret has ever been created for the cluster.

Common situations: Fresh cluster creation where the user skipped the `kops create secret` step, or after switching clusters/namespaces so the secret store for the target cluster is empty.

Related errors

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/c4966f2254d56943. Report an issue: GitHub.

Appendix: source

Thrown at upup/pkg/fi/cloudup/apply_cluster.go:492

	case kops.CloudProviderOpenstack:
		{
			if len(sshPublicKeys) == 0 {
				return nil, fmt.Errorf("SSH public key must be specified when running with Openstack (create with `kops create secret --name %s sshpublickey admin -i ~/.ssh/id_rsa.pub`)", cluster.ObjectMeta.Name)
			}

			if len(sshPublicKeys) != 1 {
				return nil, fmt.Errorf("exactly one 'admin' SSH public key can be specified when running with Openstack; please delete a key using `kops delete secret`")
			}
		}

	case kops.CloudProviderScaleway:
		{
			if !featureflag.Scaleway.Enabled() {
				return nil, fmt.Errorf("Scaleway support is currently alpha, and is feature-gated.  export KOPS_FEATURE_FLAGS=Scaleway")
			}

			if len(sshPublicKeys) == 0 {
				return nil, fmt.Errorf("SSH public key must be specified when running with Scaleway (create with `kops create secret --name %s sshpublickey admin -i ~/.ssh/id_rsa.pub`)", cluster.ObjectMeta.Name)
			}
			if len(sshPublicKeys) != 1 {
				return nil, fmt.Errorf("exactly one 'admin' SSH public key can be specified when running with Scaleway; please delete a key using `kops delete secret`")
			}

			scwCloud := cloud.(scaleway.ScwCloud)
			scwZone = scwCloud.Zone()
		}

	case kops.CloudProviderLinode:
		{
			if !featureflag.Linode.Enabled() {
				return nil, fmt.Errorf("Akamai (Linode) support is currently alpha, and is feature-gated. Please export KOPS_FEATURE_FLAGS=Linode")
			}
		}

	case kops.CloudProviderMetal:
		// Metal is a special case, we don't need to do anything here (yet)

View on GitHub (pinned to 4c8573c808)