diff --git a/metropolis/test/e2e/k8s_cts/main.go b/metropolis/test/e2e/k8s_cts/main.go
index e676a05..e419b2f 100644
--- a/metropolis/test/e2e/k8s_cts/main.go
+++ b/metropolis/test/e2e/k8s_cts/main.go
@@ -93,7 +93,8 @@
 		cancel()
 	}()
 
-	debugClient, portMap, err := launch.LaunchCluster(ctx, launch.ClusterOptions{NumNodes: 2})
+	// TODO(q3k): bump up number of nodes after multi-node workflow gets reimplemented.
+	debugClient, portMap, err := launch.LaunchCluster(ctx, launch.ClusterOptions{NumNodes: 1})
 	if err != nil {
 		log.Fatalf("Failed to launch cluster: %v", err)
 	}
diff --git a/metropolis/test/ktest/BUILD b/metropolis/test/ktest/BUILD
index cfbce55..e994c48 100644
--- a/metropolis/test/ktest/BUILD
+++ b/metropolis/test/ktest/BUILD
@@ -1,5 +1,6 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
 load("//metropolis/node/build/kconfig-patcher:kconfig-patcher.bzl", "kconfig_patch")
+load("//third_party/linux:def.bzl", "linux_image")
 
 go_library(
     name = "go_default_library",
@@ -18,7 +19,7 @@
 
 kconfig_patch(
     name = "testing-config",
-    src = "//third_party/linux:kernel-config",
+    src = "//third_party/linux:linux-metropolis.config",
     out = "testing.config",
     override_configs = {
         # Unlock command line
@@ -33,27 +34,15 @@
     },
 )
 
-genrule(
+linux_image(
     name = "linux-testing",
-    srcs = [
-        "@linux//:all",
-        ":testing-config",
+    image_format = "vmlinux",
+    kernel_config = ":testing-config",
+    # This image is directly used by the ktest macro, thus it needs a pretty
+    # wide visibility.
+    visibility = [
+        "//metropolis:__subpackages__",
     ],
-    outs = [
-        "linux-testing.elf",
-    ],
-    cmd = """
-    DIR=external/linux
-
-    mkdir $$DIR/.bin
-
-    cp $(location :testing-config) $$DIR/.config
-
-    (cd $$DIR && make -j $$(nproc) vmlinux >/dev/null)
-
-    cp $$DIR/vmlinux $@
-    """,
-    visibility = ["//metropolis:__subpackages__"],
 )
 
 filegroup(
diff --git a/metropolis/test/launch/launch.go b/metropolis/test/launch/launch.go
index 3a444ef..85e0a21 100644
--- a/metropolis/test/launch/launch.go
+++ b/metropolis/test/launch/launch.go
@@ -521,7 +521,7 @@
 
 	go func() {
 		if err := RunMicroVM(ctx, &MicroVMOptions{
-			KernelPath:             "metropolis/test/ktest/linux-testing.elf",
+			KernelPath:             "metropolis/test/ktest/vmlinux",
 			InitramfsPath:          "metropolis/test/nanoswitch/initramfs.lz4",
 			ExtraNetworkInterfaces: switchPorts,
 			PortMap:                portMap,