MySQL scripts in docker-entrypoint-initdb are not executed

Question

I am trying to create multiple databases when a MySQL container starts up. According to https://github.com/docker-library/mysql/pull/18, I can mount or copy my scripts in the /docker-entrypoint-initdb.d of the image and they will be executed automatically on start up.

However my scripts are not at all executed. Seems like the docker-entrypoint.sh doesn't see files in the /docker-entrypoint-initdb.d directory.

This is my Dockerfile:

FROM mysql
ADD script.sql /docker-entrypoint-initdb.d/script.sql
RUN chmod -R 775 /docker-entrypoint-initdb.d

ENV MYSQL_ROOT_PASSWORD mypass

This is my script.sql:

CREATE DATABASE mydb;
CREATE DATABASE mydb2;

I build and run the container:

$ docker build -t mysql .
$ docker run -v data_volume:/var/lib/mysql --name somedb -d mysql

When I access the container in tty I can see that the script.sql is in the /docker-entrypoint-initdb.d but is not executed.

I have seen the docker logs -f somedb output but there is no error.

I have tried with .sh file, I also have tried with Maria-db, the result is the same.

What could be the problem?

Answer 1

You should clear data_volume before run the container and the sql files will be executed. This volume data_volume can be removed by using command: docker volume rm data_volume.

The root cause of your problem can be found in docker-entrypoint.sh. When you run a mysql container, it checks mysql directory /var/lib/mysql exist or not. If the directory doesn't exist (run it first time), it will run your SQL files.

    if [ ! -d "$DATADIR/mysql" ]; then
        //Some other logic here

        for f in /docker-entrypoint-initdb.d/*; do
            case "$f" in
                *.sh)     echo "$0: running $f"; . "$f" ;;
                *.sql)    echo "$0: running $f"; "${mysql[@]}" < "$f"; echo ;;
                *.sql.gz) echo "$0: running $f"; gunzip -c "$f" | "${mysql[@]}"; echo ;;
                *)        echo "$0: ignoring $f" ;;
            esac
            echo
        done 

You can get more details at Dockerfile source

Answer 2

So I had the same issue for hours, and then decided to look into docker-entrypoint.sh. It turns out that the script checks for $DATADIR/mysql, typical /var/lib/mysql and skips the rest of the code if the datadir exists, incl. docker-entrypoint-initdb.d

So what I did was make a simple init.sh file to remove the datadir then start docker.

docker-compose.yml:

volumes:
  - ./docker/mysql/scripts:/docker-entrypoint-initdb.d
  - ./mysql_data:/var/lib/mysql

init.sh:

#!/bin/bash
rm -rf mysql_data
docker-compose up --force-recreate

And of course add -d to docker-compose once I see it works as expected.

Answer 3

I had the exact same issue with the mariadb image (version: 10.4) and I solved it by making sure my container data volume is empty from any files or directories when I create the container from scratch.

This is my docker compose file:

  mariadb:
    image: mariadb:10.4
    restart: unless-stopped
    environment:
      MYSQL_ROOT_PASSWORD: ********
    volumes:
    - ./storage/db:/var/lib/mysql:rw
    - ./app/db/SQL:/docker-entrypoint-initdb.d/:rw
    ports:
    - 3306:3306/tcp

For me I just had to make sure this path: './storage/db' is empty from files. Please notice that the directory has to exists but be empty.

Answer 4

I had the same problem. I solved it by changing directory owner before starting entrypoint script. Example Dockerfile:

FROM mysql:5.7.17
ADD scripts/init.sql /docker-entrypoint-initdb.d/

RUN chown -R mysql:mysql /docker-entrypoint-initdb.d/

CMD ["mysqld", "--character-set-server=utf8mb4", "--collation-server=utf8mb4_unicode_ci"]

Answer 5

I had the same issue and like @Ricky suggested above the root cause was the volume being non empty. I ran the command docker volume ls to check if the volume was still present before running my docker-compose up and sure enough the volume was there. I deleted the volume using docker volume rm <volume name> and ran the docker-compose and voila the script I had in the docker-entrypoint-initdb.d had run and I had my data in my database. I would say don't worry about the chmod stuff (as some people have suggested) until you make sure the volume is non-existent before running the docker-compose. In case that doesn't work, you can try playing around with the file permissions.

This is what I have permissions wise in my working container in case anybody is wondering -

Permission on docker-entrypoint-initdb.d

drwxr-xr-x   1 root root 4.0K Nov 16 01:52 docker-entrypoint-initdb.d

and the following on the sql scripts -

root@f0a4da202f39:/opt/app# ls -lh /docker-entrypoint-initdb.d/
total 12K
-rw-r--r-- 1 root root 12K Nov 15 22:14 Henry.sql