diff --git a/docker-compose.yml b/docker-compose.yml
index 40cf36a..2fd9485 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,9 +1,7 @@
 version: '3'
 services:
   mysql_master:
-#    image: mysql:5.7
-    build:
-      context: ./master
+    image: mysql:5.7
     env_file:
       - ./master/mysql_master.env
     container_name: "mysql_master"
diff --git a/master/Dockerfile b/master/Dockerfile
deleted file mode 100644
index 6386fcd..0000000
--- a/master/Dockerfile
+++ /dev/null
@@ -1,5 +0,0 @@
-# see https://hub.docker.com/_/mysql/
-
-FROM mysql:5.7
-
-# RUN mysql -u root -e "GRANT REPLICATION SLAVE ON *.* TO 'mydb_slave_user'@'%' IDENTIFIED BY 'mydb_slave_pwd'; FLUSH PRIVILEGES;"