Commit 4495abcd authored by Tobias Hernstig's avatar Tobias Hernstig Committed by Achilleas Pipinellis

Update doc/ci/docker/using_docker_build.md

parent 6cb30f83
......@@ -427,7 +427,7 @@ services:
variables:
DOCKER_HOST: tcp://docker:2375
DOCKER_DRIVER: overlay2
IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
before_script:
- docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
......@@ -440,8 +440,10 @@ build:
```
Here, `$CI_REGISTRY_IMAGE` would be resolved to the address of the registry tied
to this project, and `$CI_COMMIT_REF_NAME` would be resolved to the branch or
tag name for this particular job. We also declare our own variable, `$IMAGE_TAG`,
to this project. Since `$CI_COMMIT_REF_NAME` resolves to the branch or tag name,
and your branch-name can contain forward slashes (e.g., feature/my-feature), it is
safer to use `$CI_COMMIT_REF_SLUG` as the image tag. This is due to that image tags
cannot contain forward slashes. We also declare our own variable, `$IMAGE_TAG`,
combining the two to save us some typing in the `script` section.
Here's a more elaborate example that splits up the tasks into 4 pipeline stages,
......@@ -464,7 +466,7 @@ stages:
variables:
DOCKER_HOST: tcp://docker:2375
DOCKER_DRIVER: overlay2
CONTAINER_TEST_IMAGE: registry.example.com/my-group/my-project/my-image:$CI_COMMIT_REF_NAME
CONTAINER_TEST_IMAGE: registry.example.com/my-group/my-project/my-image:$CI_COMMIT_REF_SLUG
CONTAINER_RELEASE_IMAGE: registry.example.com/my-group/my-project/my-image:latest
before_script:
......
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