diff --git a/backend/kolla/prepare.sh b/backend/kolla/prepare.sh
index d21c4613..43ce83bf 100755
--- a/backend/kolla/prepare.sh
+++ b/backend/kolla/prepare.sh
@@ -18,7 +18,9 @@ fi
 echo "nameserver 8.8.8.8" > /etc/resolv.conf
 daisy_management_ip=$1
 yum -y install epel-release
+yum clean all
 yum -y install centos-release-openstack-pike
+yum clean all
 yum -y upgrade
 #curl -sSL https://get.docker.io | bash
 yum remove -y docker-engine
diff --git a/tools/setup/common/daisy_yum.sh b/tools/setup/common/daisy_yum.sh
index 553dde4f..b36a5852 100755
--- a/tools/setup/common/daisy_yum.sh
+++ b/tools/setup/common/daisy_yum.sh
@@ -36,8 +36,10 @@ function yum_set
     make_yum_client
     echo "creating epel yum repo, please wait for several seconds..."
     yum install -y epel-release
+    yum clean all
     echo "creating openstack yum repo, please wait for several seconds..."
     yum install -y centos-release-openstack-pike
+    yum clean all
 }
 
 fi