Docker compose does not execute .sql - mysql

Question

Trying to use docker compose for my application, so using official mysql images and my own Dockerfile to create my app image. I think some how my initdb.sql is not executed during docker compose up.
Running this as :
docker-compose up --build
But I can not see that initdb.sql is executed.
My docker compose looks like this:
version: "3"
services:
db:
image: mysql:5.7
restart: always
command: --default-authentication-plugin=mysql_native_password
environment:
MYSQL_DATABASE: "MYDB"
MYSQL_USER: "myuser"
MYSQL_PASSWORD: "mypassword"
MYSQL_ROOT_PASSWORD: "mypassword"
ports:
- "3306:3306"
expose:
- "3306"
volumes:
- my-db:/var/lib/mysql
- ./sqlinit:/docker-entrypoint-initdb.d/initdb.sql
networks:
vpcbr:
ipv4_address: 10.5.0.6
app:
restart: always
build: .
ports:
- 5000:5000
volumes:
- .:/app
depends_on:
- db
networks:
vpcbr:
ipv4_address: 10.5.0.5
volumes:
my-db:
networks:
vpcbr:
driver: bridge
ipam:
config:
- subnet: 10.5.0.0/16
# gateway: 10.5.0.1
As you can see I have my initdb.sql in this directory ./sqlinit and after I login to mysql container I can see this file in /docker-entrypoint-initdb.d/initdb.sql
But looks like is not executed because when I login to my app I can see:
pymysql.err.OperationalError: (1044, "Access denied for user 'myuser'#'%' to database 'MYDB'")
and on container mysql
2019-09-15T13:17:59.361447Z 2 [Note] Access denied for user 'myuser'#'%' to database 'MYDB
Of course I'm doing something wrong, I found some similar problems here but I still haven't fixed my issue

Answer 1

The problem should be in the way you are mapping the volume. You should map the source file into the target file instead of a source folder into a file, like so:
- ./sqlinit/initdb.sql:/docker-entrypoint-initdb.d/initdb.sql