create cluster script support MacOS

Signed-off-by: chaosi-zju <chaosi@zju.edu.cn>

hack/create-cluster.sh

@@ -13,8 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# This script only fits for Linux, macOS adaptation will come soon
-
+# This script works for both linux and macOS.
 set -o errexit
 set -o nounset
 set -o pipefail
@@ -70,7 +69,7 @@ fi
 function rand() {
     min=$1
     max=$(($2-$min+1))
-    num=$(date +%s%N)
+    num=$(date +%s)
     echo $(($num%$max+$min))
 }
 
@@ -96,7 +95,8 @@ cp -rf "${REPO_ROOT}"/artifacts/kindClusterConfig/general-config.yaml "${TEMP_PA
 sed -i'' -e "s#{{pod_cidr}}#${POD_CIDR}#g" "${TEMP_PATH}"/"${CLUSTER_NAME}"-config.yaml
 sed -i'' -e "s#{{service_cidr}}#${SERVICE_CIDR}#g" "${TEMP_PATH}"/"${CLUSTER_NAME}"-config.yaml
 
-kind_log="$(mktemp --suffix=-kind.log)"
+mkdir -p /tmp/kind-log/
+kind_log="/tmp/kind-log/$(date +%s)"
 echo "Creating cluster \"${CLUSTER_NAME}\" ..."
 kind create cluster --name "${CLUSTER_NAME}" --kubeconfig="${KUBECONFIG}" --image="${CLUSTER_VERSION}" --config="${TEMP_PATH}"/"${CLUSTER_NAME}"-config.yaml > ${kind_log} 2>&1 || (
   echo "Creating cluster ${CLUSTER_NAME} failed, see detail log in ${kind_log}."