diff --git a/examples/docker/maketestenv.sh b/examples/docker/maketestenv.sh
new file mode 100755
index 000000000..275692e15
--- /dev/null
+++ b/examples/docker/maketestenv.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+if [ -z "$1" -o -z "$2" ]; then
+	echo 'Usage: maketestenv.sh <output file e.g. test-01.env> <network ID>'
+	exit 1
+fi
+
+newid=`../../zerotier-idtool generate`
+
+echo "ZEROTIER_IDENTITY_SECRET=$newid" >$1
+echo "ZEROTIER_NETWORK=$2" >>$1