Tests ran in gitlab-ci fail as Postgres can't been seen - django

Question

Tests using gitlab-ci in docker fail as the Postgres service in not accessible.
In my dev environment, I run tests successfully with: $docker-compose -f local.yaml run web py.test
But in gitlab, the command - docker run --env-file=.env_dev $CONTAINER_TEST_IMAGE py.test -p no:sugar in the gitlab-ci.yaml file fails with:
9bfe10de3baf: Pull complete
a137c036644b: Pull complete
8ad45b31cc3c: Pull complete
Digest: sha256:0897b57e12bd2bd63bdf3d9473fb73a150dc4f20cc3440822136ca511417762b
Status: Downloaded newer image for registry.gitlab.com/myaccount/myapp:gitlab_ci
$ docker run --env-file=.env $CONTAINER_TEST_IMAGE py.test -p no:sugar
Postgres is unavailable - sleeping
Postgres is unavailable - sleeping
Postgres is unavailable - sleeping
Postgres is unavailable - sleeping
Postgres is unavailable - sleeping
Basically, it cannot see the Postgres service. The text Postgres is unavailable - sleeping comes from an entrypoint.sh file in the Dockerfile
Below are some relevant files:
gitlab-ci.yml
image: docker:latest
services:
- docker:dind
stages:
- build
- test
variables:
CONTAINER_TEST_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
before_script:
- docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
build:
stage: build
script:
- docker build --pull -t $CONTAINER_TEST_IMAGE --file compose/local/django/Dockerfile .
- docker push $CONTAINER_TEST_IMAGE
pytest:
stage: test
script:
- docker pull $CONTAINER_TEST_IMAGE
- docker run --env-file=.env_dev $CONTAINER_TEST_IMAGE py.test -p no:sugar
when: on_success
Dockerfile:
# ... other configs here
ENTRYPOINT ["compose/local/django/entrypoint.sh"]
entrypoint.sh:
# ..... other configs here
export DATABASE_URL=postgres://$POSTGRES_USER:$POSTGRES_PASSWORD#postgres:5432/$POSTGRES_USER
function postgres_ready(){
python << END
import sys
import psycopg2
try:
conn = psycopg2.connect(dbname="$POSTGRES_USER", user="$POSTGRES_USER", password="$POSTGRES_PASSWORD", host="postgres")
except psycopg2.OperationalError:
sys.exit(-1)
sys.exit(0)
END
}
until postgres_ready; do
>&2 echo "Postgres is unavailable - sleeping"
sleep 1
done
>&2 echo "Postgres is up - continuing..."
exec $cmd
The above setup & configuration is inspired by django-cookie-cutter