Import data.sql MySQL Docker Container

Mount your sql-dump under/docker-entrypoint-initdb.d/yourdump.sql utilizing a volume mount

mysql:
  image: mysql:latest
  container_name: mysql-container
  ports:
    - 3306:3306
  volumes:
    - ./dump.sql:/docker-entrypoint-initdb.d/dump.sql
  environment:
    MYSQL_ROOT_PASSWORD: secret
    MYSQL_DATABASE: name_db
    MYSQL_USER: user
    MYSQL_PASSWORD: password

This will trigger an import of the sql-dump during the start of the container, see https://hub.docker.com/_/mysql/ under "Initializing a fresh instance"

Another option if you don't wanna mount a volume, but wanna dump a file from your local machine, is to pipe cat yourdump.sql. Like so:

cat dump.sql | docker exec -i mysql-container mysql -uuser -ppassword db_name

See: https://gist.github.com/spalladino/6d981f7b33f6e0afe6bb

You can import database afterwards:

docker exec -i mysql-container mysql -uuser -ppassword name_db < data.sql

I can't seem to make this work with the latest mysql or mysql:5.7. So I use mariaDB instead. Here is my docker-compose.yaml code.

version: '3'

services:
  mysql:
    image: mariadb:10.3
    container_name: mariadb
    volumes:
      - container-volume:/var/lib/mysql
      - ./dump.sql:/docker-entrypoint-initdb.d/dump.sql
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: name_db
    ports:
      - "3306:3306"

volumes:
  container-volume: