feat: add K8S_POD_IP_ADDR_PLACEHOLDER

container-engine-lib/lib/backend_impls/kubernetes/kubernetes_kurtosis_backend/user_services_functions/start_user_services.go

@@ -20,6 +20,7 @@ import (
 	"github.com/kurtosis-tech/kurtosis/container-engine-lib/lib/backend_interface/objects/enclave"
 	"github.com/kurtosis-tech/kurtosis/container-engine-lib/lib/backend_interface/objects/port_spec"
 	"github.com/kurtosis-tech/kurtosis/container-engine-lib/lib/backend_interface/objects/service"
+	"github.com/kurtosis-tech/kurtosis/core/server/api_container/server/startosis_engine/kurtosis_types/service_config"
 	"github.com/kurtosis-tech/kurtosis/container-engine-lib/lib/operation_parallelizer"
 	"github.com/kurtosis-tech/kurtosis/container-engine-lib/lib/uuid_generator"
 	"github.com/kurtosis-tech/stacktrace"
@@ -324,12 +325,18 @@ func createStartServiceOperation(
 		privateIPAddr := matchingObjectAndResources.ServiceRegistration.GetPrivateIP().String()
 		for index := range entrypointArgs {
 			entrypointArgs[index] = strings.Replace(entrypointArgs[index], privateIPAddrPlaceholder, privateIPAddr, unlimitedReplacements)
+			// Replace pod IP placeholder with environment variable reference
+			entrypointArgs[index] = strings.Replace(entrypointArgs[index], service_config.K8sPodIPAddrPlaceholder, "${K8S_POD_IP}", unlimitedReplacements)
 		}
 		for index := range cmdArgs {
 			cmdArgs[index] = strings.Replace(cmdArgs[index], privateIPAddrPlaceholder, privateIPAddr, unlimitedReplacements)
+			// Replace pod IP placeholder with environment variable reference
+			cmdArgs[index] = strings.Replace(cmdArgs[index], service_config.K8sPodIPAddrPlaceholder, "${K8S_POD_IP}", unlimitedReplacements)
 		}
 		for key := range envVars {
 			envVars[key] = strings.Replace(envVars[key], privateIPAddrPlaceholder, privateIPAddr, unlimitedReplacements)
+			// Replace pod IP placeholder with environment variable reference
+			envVars[key] = strings.Replace(envVars[key], service_config.K8sPodIPAddrPlaceholder, "${K8S_POD_IP}", unlimitedReplacements)
 		}
 
 		namespaceName := kubernetesService.GetNamespace()
@@ -654,6 +661,18 @@ func getUserServicePodContainerSpecs(
 		containerEnvVars = append(containerEnvVars, envVar)
 	}
 
+	// Add K8S_POD_IP environment variable using Kubernetes Downward API
+	podIPEnvVar := apiv1.EnvVar{
+		Name:  "K8S_POD_IP",
+		Value: "",
+		ValueFrom: &apiv1.EnvVarSource{
+			FieldRef: &apiv1.ObjectFieldSelector{
+				FieldPath: "status.podIP",
+			},
+		},
+	}
+	containerEnvVars = append(containerEnvVars, podIPEnvVar)
+
 	kubernetesContainerPorts, err := getKubernetesContainerPortsFromPrivatePortSpecs(privatePorts)
 	if err != nil {
 		return nil, stacktrace.Propagate(err, "An error occurred getting Kubernetes container ports from the private port specs map")

core/server/api_container/server/startosis_engine/kurtosis_types/service_config/service_config.go

@@ -56,6 +56,7 @@ const (
 	TtyEnabledAttr                  = "tty_enabled"
 
 	DefaultPrivateIPAddrPlaceholder = "KURTOSIS_IP_ADDR_PLACEHOLDER"
+	K8sPodIPAddrPlaceholder         = "K8S_POD_IP_ADDR_PLACEHOLDER"
 
 	filesArtifactExpansionDirsParentDirpath string = "/files-artifacts"
 	// TODO This should be populated from the build flow that builds the files-artifacts-expander Docker image