[installer] support service type in experimental config

Author: nandajavarma

install/installer/pkg/components/proxy/service.go

@@ -14,7 +14,28 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
+var allowedServiceTypes = map[corev1.ServiceType]struct{}{
+	corev1.ServiceTypeLoadBalancer: {},
+	corev1.ServiceTypeClusterIP:    {},
+	corev1.ServiceTypeNodePort:     {},
+	corev1.ServiceTypeExternalName: {},
+}
+
 func service(ctx *common.RenderContext) ([]runtime.Object, error) {
+	serviceType := corev1.ServiceTypeLoadBalancer
+	_ = ctx.WithExperimental(func(cfg *experimental.Config) error {
+		if cfg.Common != nil {
+			st := cfg.Common.ProxyConfig
+			if st != nil {
+				_, allowed := allowedServiceTypes[corev1.ServiceType(*st.ServiceType)]
+				if allowed {
+					serviceType = *st.ServiceType
+				}
+			}
+		}
+		return nil
+	})
+
 	loadBalancerIP := ""
 	_ = ctx.WithExperimental(func(cfg *experimental.Config) error {
 		if cfg.WebApp != nil && cfg.WebApp.ProxyConfig != nil && cfg.WebApp.ProxyConfig.StaticIP != "" {
@@ -57,8 +78,10 @@ func service(ctx *common.RenderContext) ([]runtime.Object, error) {
 	}
 
 	return common.GenerateService(Component, ports, func(service *corev1.Service) {
-		service.Spec.Type = corev1.ServiceTypeLoadBalancer
-		service.Spec.LoadBalancerIP = loadBalancerIP
+		service.Spec.Type = serviceType
+		if serviceType == corev1.ServiceTypeLoadBalancer {
+			service.Spec.LoadBalancerIP = loadBalancerIP
+		}
 
 		service.Annotations["external-dns.alpha.kubernetes.io/hostname"] = fmt.Sprintf("%s,*.%s,*.ws.%s", ctx.Config.Domain, ctx.Config.Domain, ctx.Config.Domain)
 		service.Annotations["cloud.google.com/neg"] = `{"exposed_ports": {"80":{},"443": {}}}`

install/installer/pkg/config/v1/experimental/experimental.go

@@ -24,8 +24,17 @@ type Config struct {
 }
 
 type CommonConfig struct {
-	PodConfig                map[string]*PodConfig `json:"podConfig,omitempty"`
-	StaticMessagebusPassword string                `json:"staticMessagebusPassword"`
+	PodConfig map[string]*PodConfig `json:"podConfig,omitempty"`
+	// ProxyConfig is allows setting the serviceType for proxy service
+	ProxyConfig              *ServiceConfig `json:"proxyConfig,omitempty"`
+	StaticMessagebusPassword string         `json:"staticMessagebusPassword"`
+}
+
+// ServiceConfig enables modification of type of service to `ClusterIP` if needed,
+// currently supported only for proxyConfig
+type ServiceConfig struct {
+	// Allowed values are: "ClusterIP", "LoadBalancer", "NodePort", "ExternalName"
+	ServiceType *corev1.ServiceType `json:"serviceType,omitempty" validate:"omitempty,service_config_type"`
 }
 
 type PodConfig struct {

install/installer/pkg/config/v1/experimental/validation.go

@@ -5,6 +5,8 @@
 package experimental
 
 import (
+	corev1 "k8s.io/api/core/v1"
+
 	"github.com/gitpod-io/gitpod/installer/pkg/cluster"
 	"github.com/go-playground/validator/v10"
 )
@@ -16,11 +18,22 @@ var TracingSampleTypeList = map[TracingSampleType]struct{}{
 	TracingSampleTypeRemote:        {},
 }
 
+var ServiceTypeList = map[corev1.ServiceType]struct{}{
+	corev1.ServiceTypeLoadBalancer: {},
+	corev1.ServiceTypeClusterIP:    {},
+	corev1.ServiceTypeNodePort:     {},
+	corev1.ServiceTypeExternalName: {},
+}
+
 var ValidationChecks = map[string]validator.Func{
 	"tracing_sampler_type": func(fl validator.FieldLevel) bool {
 		_, ok := TracingSampleTypeList[TracingSampleType(fl.Field().String())]
 		return ok
 	},
+	"service_config_type": func(fl validator.FieldLevel) bool {
+		_, ok := ServiceTypeList[corev1.ServiceType(fl.Field().String())]
+		return ok
+	},
 }
 
 func ClusterValidation(cfg *Config) cluster.ValidationChecks {