Create default loadbalancer when SSL certificate is specified

[rudeigerc]

Fixes #10648

Generate a default load balancer when the SSL certificate is specified, so that the original process would work well.

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[hakman]

/assign @rifelpet
/ok-to-test

[rifelpet]

/lgtm
/approve

We should make sure that users use an NLB if they specify a certificate and are using k8s >= 1.19 because classic ELBs won't work, but we can add that validation in a separate PR.

Thanks!

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This pull-request has been approved by: rifelpet, rudeigerc

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[rifelpet]

oh nevermind, we already do 🙂

kops/pkg/apis/kops/validation/validation.go

Lines 227 to 229 in f9ec7ef

	if spec.API.LoadBalancer.SSLCertificate != "" && spec.API.LoadBalancer.Class != kops.LoadBalancerClassNetwork && c.IsKubernetesGTE("1.19") {
	allErrs = append(allErrs, field.Forbidden(fieldPath, "sslCertificate requires network loadbalancer for K8s 1.19+ see https://github.com/kubernetes/kops/blob/master/permalinks/acm_nlb.md"))
	}

so this means you'll need to provide --api-loadbalancer-class=network when also setting --api-ssl-certificate for k8s >= 1.19