working

compose/app.yml

@@ -1,13 +1,13 @@
 services:
   db:
-    image: mysql:latest
+    image: mysql:5.7
     environment:
       MYSQL_DATABASE: exemple
       MYSQL_USER: exemple
       MYSQL_PASSWORD: exemple
       MYSQL_ROOT_PASSWORD: root
     ports:
-      - 127.0.0.1:3306:3306
+      - 3306:3306
 
   app:
     build: ./app
@@ -18,8 +18,8 @@ services:
       DB_USER: exemple
       DB_PASSWORD: exemple
       DB_NAME: exemple
-    command: ["./wait-for-it.sh", "db:3306", "--", "node", "index.js"]
+    command: ["./wait-for-it.sh", "db:3306", "--timeout=30","--", "node", "index.js"]
     volumes:
       - ./app:/usr/src/app
     ports:
-      - 127.0.0.1:3000:3000
+      - 3000:3000