diff --git a/tests/run_tests b/tests/run_tests
index 78c1c6a..3b5d6ec 100755
--- a/tests/run_tests
+++ b/tests/run_tests
@@ -18,6 +18,15 @@ if ! [ -e /root/.ssh/id_rsa ]; then
     ssh -oStrictHostKeyChecking=no localhost true || exit 1
 fi
 
+cat >> ~/.ssh/config <<EOF
+Host *
+    addkeystoagent yes
+    controlpath ~/.ssh/control-master-%r@%h:%p
+    controlmaster auto
+    controlpersist 3600
+EOF
+
+
 modprobe brd rd_size=512000
 
 umount /tmp/ZfsCheck*
diff --git a/tests/tests_docker b/tests/tests_docker
index 4f44278..297c8da 100755
--- a/tests/tests_docker
+++ b/tests/tests_docker
@@ -4,8 +4,13 @@
 
 set -e
 
+if ! [ -e /.dockerenv ]; then
+  echo "only run this script inside a docker container!"
+  exit 1
+fi
+
 if ! [ -e /dev/ram0 ]; then
-    echo "Please run this outside container:" >&2
+    echo "Please load this module outside container:" >&2
     echo "sudo modprobe brd rd_size=512000" >&2
     exit 1
 
@@ -16,11 +21,21 @@ ssh-keygen -A
 /usr/sbin/sshd
 udevd -d
 
-#test ssh localhost
+
+#config ssh
 if ! [ -e /root/.ssh/id_rsa ]; then
     ssh-keygen -t rsa -f /root/.ssh/id_rsa -P ''
 fi
-cat /root/.ssh/id_rsa.pub  >> /root/.ssh/authorized_keys 
+
+cat >> ~/.ssh/config <<EOF
+Host *
+    addkeystoagent yes
+    controlpath ~/.ssh/control-master-%r@%h:%p
+    controlmaster auto
+    controlpersist 3600
+EOF
+
+cat /root/.ssh/id_rsa.pub  >> /root/.ssh/authorized_keys
 ssh -oStrictHostKeyChecking=no localhost 'echo SSH OK' 
 
 cd /app