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Gitlab CI Service Not Reachable

Can anyone help me with my CI troubles? I have a project that sets up a Flask webserver via Docker. In CI, I'm trying to use that image as a service to run integration tests on it, such as checking how it handles bad or messy inputs. However, when I use the Docker image to start a service with an alias, pytest can't access it from the CI job.

The Dockerfile for the test image is [here](https://gitlab.com/kitchen-server/kitchen-server/-/blob/ci-cd/test/assets/Dockerfile#L24-26). The highlighted lines (everything below `ENTRYPOINT`) are the only differences between the base and test image.

Example job that's failing [here](https://gitlab.com/kitchen-server/kitchen-server/-/jobs/3848991470). (The Dockerfile exposes port 8080 and that's what the underlying program binds to, which is why I'm using that port in CI - is that incorrect?)

ERROR test/integration_tests.py - requests.exceptions.ConnectionError: HTTPConnectionPool(host='test-service', port=8080): Max retries exceeded with url: / (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f74768f9f50>: Failed to establish a new connection: [Errno -2] Name or service not known'))

Speaking of, that's [here](https://gitlab.com/kitchen-server/kitchen-server/-/blob/ci-cd/ci/branch.gitlab-ci.yml) (ignore that the build job is commented out; I just didn't want to burn CI minutes running it while troubleshooting my testing stage). I define a test image tag, a service alias, and a service URL based on the alias on L24-26. Then in the failing job, I define a service using the test image tag as the name, and the alias from the alias variable. Then the script runs a couple pip installs before calling pytest on a specific file.

variables:
LATEST_TAG: $CI_REGISTRY_IMAGE:latest
IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
TEST_TAG: $IMAGE_TAG-test
TEST_SERVICE_ALIAS: test-service
TEST_URL: https://$TEST_SERVICE_ALIAS:8080
[...]
integration-tests:
stage: test
image: python:3.11.2-slim
services:
- name: $TEST_TAG
alias: $TEST_SERVICE_ALIAS
script:
- pip install -r pie_chart/requirements.txt
- pip install -r test/assets/requirements.txt
- echo "$TEST_SERVICE_ALIAS"
- echo "$TEST_URL"
- pytest test/integration_tests.py

The error comes from [this part](https://gitlab.com/kitchen-server/kitchen-server/-/blob/ci-cd/test/integration_tests.py#L29-31) of the program, specifically the `requests.get()` call. It seems to read and print to stdout the URL correctly as I defined it in the CI file, as shown in the CI job linked above.

test_url: str = os.environ.get('TEST_URL')
print(f"\n == Test URL: {test_url} ==\n")
response: requests.Response = requests.get(test_url)

I've tried

* A ton of different URLs
* All combinations of \["" | "https://" | "https://"\] + \["test-service" | "localhost" | "127.0.0.1"\] + \["" | ":80" | ":8080"\]
* Defining the service in the job
* Defining the service locally
* `FF_NETWORK_PER_BUILD: "true"`

https://redd.it/11f3yqa
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GitLab

test/assets/Dockerfile · ci-cd · kitchen-server / Kitchen Server · GitLab

Docker homelab server for cooking utilities such as recipes.

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