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Chapter 6. Custom Builder
6.1. Overview
By allowing you to define a specific builder image responsible for the entire build process, OpenShift Container Platform’s Custom build strategy was designed to fill a gap created with the increased popularity of creating container images. When there is a requirement for a build to still produce individual artifacts (packages, JARs, WARs, installable ZIPs, and base images, for example), a Custom builder image using the Custom build strategy is the perfect match to fill that gap.
A Custom builder image is a plain container image embedded with build process logic, for example for building RPMs or base container images. The openshift/origin-custom-docker-builder image is available on the Docker Hub as an example implementation of a Custom builder image.
Additionally, the Custom builder allows implementing any extended build process, for example a CI/CD flow that runs unit or integration tests.
To fully leverage the benefits of the Custom build strategy, you must understand how to create a Custom builder image that will be capable of building desired objects.
6.2. Custom Builder Image
Upon invocation, a custom builder image will receive the following environment variables with the information needed to proceed with the build:
| Variable Name | Description |
|---|---|
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The entire serialized JSON of the |
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| The URL of a Git repository with source to be built. |
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Uses the same value as |
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| Specifies the subdirectory of the Git repository to be used when building. Only present if defined. |
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| The Git reference to be built. |
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| The version of the OpenShift Container Platform master that created this build object. |
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| The Docker registry to push the image to. |
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| The Docker tag name for the image being built. |
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The path to the Docker credentials for running a |
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Specifies the path to the Docker socket, if exposing the Docker socket was enabled in the build configuration (if |
6.3. Custom Builder Workflow
Although Custom builder image authors have great flexibility in defining the build process, your builder image must still adhere to the following required steps necessary for seamlessly running a build inside of OpenShift Container Platform:
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The
Buildobject definition contains all the necessary information about input parameters for the build. - Run the build process.
- If your build produces an image, push it to the build’s output location if it is defined. Other output locations can be passed with environment variables.
