Bitbucket pipeline with docker and mysql - mysql

Question

I want to implement some CI/CD for a Django web using the bitbucket pipeline. The goal is: Test the Docker builds correctly and next run Django test.
But I get this error:
django.db.utils.OperationalError: (2003, 'Can\'t connect to MySQL server on \'127.0.0.1\' (111 "Connection refused")')
Here is the bitbucket-pipelines.yml:
options:
docker: true
definitions:
services:
mysql:
image: mysql:5.7
variables:
MYSQL_DATABASE: 'foo'
MYSQL_USER: 'default'
MYSQL_PASSWORD: 'default'
MYSQL_RANDOM_ROOT_PASSWORD: 'yes'
steps:
- step: &test-docker
name: "docker builds"
services:
- docker
- mysql
caches:
- docker
script:
- export IMAGE_NAME=foo:$BITBUCKET_COMMIT
- export CONTAINER_NAME=test-foo
- docker build -t $IMAGE_NAME .
- docker run -p 8080:8080 --name $CONTAINER_NAME --rm -d $IMAGE_NAME
- docker exec $CONTAINER_NAME python /app/manage.py test tests --noinput
- docker stop $CONTAINER_NAME
pipelines:
default:
- step: *test-docker
I already tried some solutions and workarounds like. Linking the ports from the services and the docker; using volumes; and test the Django outside docker. This one have more problems because it needs 2 DB (original and test) and a user with full access, and using the entrypoint didn't work.

Answer 1

The database address specified in your django application i.e., 127.0.0.1 only works if you have mysql running in you local system and not the container.
As you are using a docker image of mysql, it has it's own IP address and not 127.0.0.1. You can use docker inspect <container id> to get the IP address.
check this in you django settings.py file:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'foo',
'USER': 'default',
'PASSWORD': 'default',
'HOST': <mysql_ip>, #this is 127.0.0.1 in your case
'PORT': '3306',
}
}
If you are internally using docker services through docker-compose, you can simply access the mysql container using it's service name in the yml file.