Building a Docker image
If your application is packaged as a Docker image, you can build it as part of your CI workflow. Typically, you would want to build your image in the
post_ci sections, depending on your scenario.
1. Commit your Dockerfile
Your Dockerfile needs to be committed to the repository. It doesn't have to be at the root of the repository since we can specify a path while calling the
docker build command.
2. Specifying hub integration
If your Dockerfile specifies a private image in its
FROM section, we need to authenticate against the registry it is stored in. If your
FROM image is a public image which can be pulled without authentication, skip this step.
Add an integration for the Docker registry where the private image is stored. Instructions are here:
Write down the friendly name of the integration you just created.
- Include the integration in your
For example, here is a snippet for Docker Hub and Docker Private/Trusted Registry:
integrations: hub: - integrationName: myIntegration #replace with your integration name type: dockerRegistryLogin
For other registries, the
type is set as follows:
- Amazon ECR:
type: gcloudKey(set the type to
gcloudKeyif you are using the new Google Cloud Integration. If you are still using the deprecated GCR Integration, set the type to
- CoreOS Quay:
3. Building Docker image
You can include the
docker build command in your
shippable.yml as shown below:
build: ci: - docker build -t myImageRepo/myImageName:$BRANCH.BUILD_NUMBER .
Please note that the
docker build command can be in the
post_ci sections. Also,
myImageRepo is the fully qualified repository name, depending on the Docker registry.
If your Dockerfile is not at the root, but is in the
base_image folder for example, your snippet would look like this:
build: ci: - docker build -t myImageRepo/myImageName:$BRANCH.BUILD_NUMBER ./base_image
If you want to then push your image to a Docker registry, read our docs on Pushing artifacts
Building different images based on branch
You can build different Docker images for different branches even authenticate against different Docker registry accounts to push them to different orgs. The config is as shown below:
build: post_ci: - if [ "$BRANCH" == "master" ]; then docker build -t docker-hub-org-1/image-name:image-tag .; fi - if [ "$BRANCH" == "dev" ]; then docker build -t docker-hub-org-2/image-name:image-tag .; fi integrations: hub: - integrationName: master-DockerHub #replace with your integration name type: dockerRegistryLogin #replace with your registry type branches: # use this integration only for master branch only: - master - integrationName: dev-DockerHub #replace with your integration name type: dockerRegistryLogin #replace with your registry type branches: # use this integration only for dev branch only: - dev
Building Docker images with multiple tags
If you want to build images with multiple tags, you can do so as shown below:
build: post_ci: - docker build -t docker-hub-org/image-name:image-tag-1 -t docker-hub-org/image-name:image-tag-2 . integrations: hub: - integrationName: myIntegration #replace with your integration name type: dockerRegistryLogin #replace with your registry type
Here are some links to a working sample of this scenario. This is a simple Node.js application that runs some tests and builds a Docker image.
Source code: devops-recipes/ci-push-docker-hub.
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