Maria DB docker Access denied for user 'root'#'localhost' - docker

Question

I'm using a MariaDB docker image and keep getting the Warning:
[Warning] Access denied for user 'root'#'localhost' (using password: NO)
This is my docker file used to create the image:
FROM mariadb:10.6.4
ENV MYSQL_ROOT_PASSWORD pw
ENV MARIADB_DATABASE db1
ENV MARIADB_USER user1
ENV MARIADB_PASSWORD user1pw
I start the container in docker-compose :
mariadb:
restart: always
image: mariadb_image
container_name: mariadb_container
build: topcat_mariadb/.
ports:
- 2306:3306
and I access the container from another container using:
mysql+pymysql://user1:user1pw#mariadb_container:3306/db1
Most of the solutions google found was running some kind of SQL statement, but as I'm running a docker container, I need an ephemeral solution.
Anyone know how to fix this in docker?
-----EDIT-----
I had forgotten to add the health check section to the dockercompose file:
mariadb:
restart: always
image: mariadb_image
container_name: mariadb_container
build: topcat_mariadb/.
ports:
- 2306:3306
healthcheck:
test: ["CMD-SHELL", 'mysqladmin ping']
interval: 10s
timeout: 2s
retries: 10

Answer 1

Update
Based on the update to your question, you're trying to run the mysqladmin ping command inside the container. mysqladmin is attempting to connect as the root user, but authenticating to your database server requires a password.
You can provide a password to mysqladmin by:
Using the -p command line option
Using the MYSQL_PWD environment variable
Creating a credentials file
If we move the root password out of your image, and instead set it at runtime, we can write your docker-compose.yml file like this:
version: "3"
services:
mariadb:
restart: always
image: mariadb_image
container_name: mariadb_container
build: topcat_mariadb/.
environment:
- "MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD"
- "MYSQL_PWD=$MYSQL_ROOT_PASSWORD"
healthcheck:
test: ["CMD-SHELL", 'mysqladmin ping']
interval: 10s
timeout: 2s
retries: 10
And then in our .env file we can set:
MYSQL_ROOT_PASSWORD=pw1
Now after the container starts up we see that the container is
healthy:
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c1c9c9f787e6 mariadb_image "docker-entrypoint.s…" 28 seconds ago Up 27 seconds (healthy) 3306/tcp mariadb_container
As a side note, it's not clear from this example why you're bothering to build a custom image: it's better to set the environment variables at runtime, rather than creating an image with "baked-in" credentials.
Previous answer
I can't reproduce your problem when using the mysql client or Python code. Given the following docker-compose.yml:
version: "3"
services:
mariadb:
restart: always
image: mariadb_image
container_name: mariadb_container
build: topcat_mariadb/.
shell:
image: mariadb:10.6.4
command: sleep inf
(The directory topcat_mariadb contains the Dockerfile from your
question.)
If I exec into the shell container:
docker-compose exec shell bash
And run mysql like this:
mysql -h mariadb_container -u user1 -p db1
It works just fine:
root#4fad8e8435df:/# mysql -h mariadb_container -u user1 -p db1
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 6
Server version: 10.6.4-MariaDB-1:10.6.4+maria~focal mariadb.org binary distribution
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [db1]>
It looks like you may be using sqlalchemy. If I add a Python container
to the mix:
version: "3"
services:
mariadb:
restart: always
image: mariadb_image
container_name: mariadb_container
build: topcat_mariadb/.
shell:
image: mariadb:10.6.4
command: sleep inf
python:
image: python:3.9
command: sleep inf
And then run the following Python code in the python container:
>>> import sqlalchemy
>>> e = sqlalchemy.engine.create_engine('mysql+pymysql://user1:user1pw#mariadb_container:3306/db1')
>>> res = e.execute('select 1')
>>> res.fetchall()
[(1,)]
It also seems to work without a problem.