+# use ramfs to fix docker socket connection issue with overlay mode in centos
+if [ ! -d $ramfs ]; then
+ mkdir -p $ramfs
+fi
+
+if [ ! -z $(df $ramfs | tail -n -1 | grep $ramfs) ]; then
+ sudo mount -t tmpfs -o size=32M tmpfs $ramfs
+fi
+
+# enable contro path in docker
+echo <<EOF > /tmp/ansible.cfg
+[defaults]
+callback_whitelist = profile_tasks
+[ssh_connection]
+control_path=/mnt/ramfs/ansible-ssh-%%h-%%p-%%r
+EOF
+
+cmd=" docker run -id -e $envs -v ${ramfs_volume} opnfv/qtip:${DOCKER_TAG} /bin/bash"