Add cluster validation and regenerate kubeapi cert

cluster/validation.go

@@ -0,0 +1,46 @@
+package cluster
+
+import (
+	"fmt"
+	"strings"
+)
+
+func (c *Cluster) ValidateCluster() error {
+	// make sure cluster has at least one controlplane/etcd host
+	if len(c.ControlPlaneHosts) == 0 {
+		return fmt.Errorf("Cluster must have at least one control plane host")
+	}
+	if len(c.EtcdHosts) == 0 {
+		return fmt.Errorf("Cluster must have at least one etcd host")
+	}
+
+	// validate services options
+	err := validateServicesOption(c)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func validateServicesOption(c *Cluster) error {
+	servicesOptions := map[string]string{
+		"etcd_image":                               c.Services.Etcd.Image,
+		"kube_api_image":                           c.Services.KubeAPI.Image,
+		"kube_api_service_cluster_ip_range":        c.Services.KubeAPI.ServiceClusterIPRange,
+		"kube_controller_image":                    c.Services.KubeController.Image,
+		"kube_controller_service_cluster_ip_range": c.Services.KubeController.ServiceClusterIPRange,
+		"kube_controller_cluster_cidr":             c.Services.KubeController.ClusterCIDR,
+		"scheduler_image":                          c.Services.Scheduler.Image,
+		"kubelet_image":                            c.Services.Kubelet.Image,
+		"kubelet_cluster_dns_service":              c.Services.Kubelet.ClusterDNSServer,
+		"kubelet_cluster_domain":                   c.Services.Kubelet.ClusterDomain,
+		"kubelet_infra_container_image":            c.Services.Kubelet.InfraContainerImage,
+		"kubeproxy_image":                          c.Services.Kubeproxy.Image,
+	}
+	for optionName, OptionValue := range servicesOptions {
+		if len(OptionValue) == 0 {
+			return fmt.Errorf("%s can't be empty", strings.Join(strings.Split(optionName, "_"), " "))
+		}
+	}
+	return nil
+}