diff --git a/backend/kolla/prepare.sh b/backend/kolla/prepare.sh
index 8d3056ea..e2b33d5f 100755
--- a/backend/kolla/prepare.sh
+++ b/backend/kolla/prepare.sh
@@ -17,7 +17,7 @@ fi
 echo "nameserver 8.8.8.8" > /etc/resolv.conf
 daisy_management_ip=$1
 yum -y install epel-release centos-release-openstack-pike
-
+yum clean all
 #curl -sSL https://get.docker.io | bash
 yum remove -y docker-engine
 yum install -y https://yum.dockerproject.org/repo/main/centos/7/Packages/docker-engine-17.05.0.ce-1.el7.centos.x86_64.rpm