A service in IceCI is a container that is running during the whole pipeline execution. Services let you run backing containers for your pipeline - for example a PostgreSQL database for your integration tests.
Every service has a name - in the pipeline it can be resolved using this name. If you create a website service, running
curl http://website command in your pipeline
step will hit the website service assuming that it’s a container listening on port 80 (like nginx, for example).
The pipeline will stop all services after finishing - regardless of the pipeline result.
If a service stops during the pipeline execution, the pipeline will fail no matter what was the exit code of the service main process.