diff --git a/run-builder.sh b/run-builder.sh
new file mode 100755
index 0000000..9cb8617
--- /dev/null
+++ b/run-builder.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/bash
+
+SHARE_DIR=/tmp/osbuild-composer-koji-test
+DATA_DIR=/var/tmp/osbuild-koji-data
+
+# this script must be run as root
+if [ $UID != 0 ]; then
+  echo This script must be run as root.
+  exit 1
+fi
+
+# decide whether podman or docker should be used
+if which podman 2>/dev/null >&2; then
+  CONTAINER_RUNTIME=podman
+elif which docker 2>/dev/null >&2; then
+  CONTAINER_RUNTIME=docker
+else
+  echo No container runtime found, install podman or docker.
+  exit 2
+fi
+
+${CONTAINER_RUNTIME} run --rm -i -t --name org.osbuild.koji.builder --network org.osbuild.koji \
+  -v "${SHARE_DIR}:/share:z" \
+  -v "${DATA_DIR}:/mnt:z" \
+  --hostname org.osbuild.koji.kojid \
+  --add-host=composer:$(ip route show dev cni-podman0 | cut -d\  -f7) \
+  koji.builder