diff --git a/Makefile b/Makefile
index bd267f46..ee4d7d1b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,11 @@
-DOCKER_NAME ?= rcore-tutorial-v3
+DOCKER_TAG ?= rcore-tutorial-v3:latest
 .PHONY: docker build_docker
 	
 docker:
-	docker run --rm -it -v ${PWD}:/mnt -w /mnt ${DOCKER_NAME} bash
+	docker run --rm -it -v ${PWD}:/mnt -w /mnt --name rcore-tutorial-v3 ${DOCKER_TAG} bash
 
 build_docker: 
-	docker build -t ${DOCKER_NAME} .
+	docker build -t ${DOCKER_TAG} --target build .
 
 fmt:
 	cd easy-fs; cargo fmt; cd ../easy-fs-fuse cargo fmt; cd ../os ; cargo fmt; cd ../user; cargo fmt; cd ..