MySQL Docker Compose password not working - mysql

Question

What I want to do is:
Create a MySQL8 docker container
The MySQL container should run a dump file
I was successful in creating the basic container, however, that are several issues:
The password that I added in docker-compose.yml is ignored, when I run:
"docker exec -it mysqlDB bash" followed by "MySQL -u admin -p" I get Acess denied, and also with root
I don't know if the dump is being used because I can access the DB
I'm also getting this error:
[ERROR] [MY-000061] [Server] 1105 Input Output error while reading file /docker-entrypoint-initdb.d/, line 0, I/O error code 1
I tried many things for hours and it only got worse like not running at all.
I always run with: "docker-compose --log-level DEBUG -verbose up"
I always retry with the sequence:
ctrl+c
docker-compose down
docker system prune -a
docker volume prune
After running these prunes I need to run twice, or else I got the error:
"The designated data directory /var/lib/mysql/ is unusable. You can remove all files that the server added to it."
Dockerfile(at /MySQL), there's also a LastDump.sql in this directory
EDIT: Later I deleted this file, and got the same result
FROM mysql:8.0.21
RUN chown -R mysql:root /var/lib/mysql/
ENV MYSQL_DATABASE=Olimpo
ENV MYSQL_USER=admin
ENV MYSQL_PASSWORD=senha
ENV MYSQL_ROOT_PASSWORD=senha
ADD LastDump.sql /etc/mysql/LastDump.sql
RUN sed -i 's/MYSQL_DATABASE/'$MYSQL_DATABASE'/g' /etc/mysql/LastDump.sql
RUN cp /etc/mysql/LastDump.sql /docker-entrypoint-initdb.d
EXPOSE 3306
docker-compose.yml(at / main folder)
version: "3.8"
# Define services
services:
# Database Service (Mysql)
mysqldb:
image: mysql:8.0.21
container_name: mysqlDB
command: --default-authentication-plugin=mysql_native_password --init-file /docker-entrypoint-initdb.d/
ports:
- "3307:3306"
restart: always
environment:
MYSQL_DATABASE: Olimpo
MYSQL_USER: admin
MYSQL_PASSWORD: senha
MYSQL_ROOT_PASSWORD: senha
volumes:
- mysql_data:/var/lib/mysql
# next line is commented doesn't run with it
#- ./MySQL/LastDump.sql:/docker-entrypoint-initdb.d
networks:
- backend
# Volumes
volumes:
mysql_data:
driver: local
# Networks to be created to facilitate communication between containers
networks:
backend:

Answer 1

Your problem seem to be the parameter in the command of your yml file. It worked in my machine when I took it out.
Change from command: --default-authentication-plugin=mysql_native_password --init-file /docker-entrypoint-initdb.d/ to command: command: --default-authentication-plugin=mysql_native_password
Fixed file is below:
# Define services
services:
# Database Service (Mysql)
mysqldb:
image: mysql:8.0.21
container_name: mysqlDB
command: --default-authentication-plugin=mysql_native_password
ports:
- "3307:3306"
restart: always
environment:
MYSQL_DATABASE: Olimpo
MYSQL_USER: admin
MYSQL_PASSWORD: senha
MYSQL_ROOT_PASSWORD: senha
volumes:
- mysql_data:/var/lib/mysql
# next line is commented doesn't run with it
#- ./MySQL/LastDump.sql:/docker-entrypoint-initdb.d
networks:
- backend
# Volumes
volumes:
mysql_data:
driver: local
# Networks to be created to facilitate communication between containers
networks:
backend:

Answer 2

The mysql dockerfile is useless.
Create a folder called mysql-dump with the dump.sql inside.
Add the line "USE db_name" to dump.sql
In docker-compose.yml:
remove "--init-file /docker-entrypoint-initdb.d/"
add the line in volumes "- ./mysql-dump:/docker-entrypoint-initdb.d"