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Jul 16, 2025
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Build multi arch build-x #10854

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Build multi arch build-x
SushrutHarness Jul 9, 2025
7a811f7
Simplest instructions, chose to obfuscate `CI_USE_BUILDX_ON_K8`
SushrutHarness Jul 14, 2025
086b0c9
DLC seems to be the prime differentiator in method not infra
SushrutHarness Jul 14, 2025
d6906ca
Update docs/continuous-integration/use-ci/build-and-upload-artifacts/…
SushrutHarness Jul 16, 2025
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Update docs/continuous-integration/use-ci/build-and-upload-artifacts/…
SushrutHarness Jul 16, 2025
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45 changes: 45 additions & 0 deletions docs/continuous-integration/use-ci/build-and-upload-artifacts/build-multi-arch.md
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Expand Up @@ -4,6 +4,49 @@ description: You can build multi-architecture images in a CI pipeline.
sidebar_position: 21
---

This document covers methods for building multi architecture images in Harness with or without [Docker layer caching (DLC)](/docs/continuous-integration/use-ci/caching-ci-data/docker-layer-caching).

## With DLC

:::info Self-Hosted Infrastructure

If you're using self-hosted infrastructure, turn on the feature flag `CI_ENABLE_DLC_SELF_HOSTED`. To enable this flag, contact [Harness Support](mailto:[email protected]).

:::

1. Open your [Build and Push an image to Docker Registry](/docs/continuous-integration/use-ci/build-and-upload-artifacts/build-and-push/build-and-push-to-docker-registry/) step.
2. Select `Enable Docker Layer caching`. To learn more, go to [Docker layer caching](/docs/continuous-integration/use-ci/caching-ci-data/docker-layer-caching).
2. Open the **Optional Configuration** dropdown at the bottom of the step.
3. Add a variable under **Environment Variables**.
4. Enter `PLUGIN_PLATFORM` for your **Key**.
5. Enter your architectures as a comma separated list as your **Value**. For example, `linux/amd64,linux/arm64`.

## Without DLC

:::info Kubernetes Infrastructure

If you're using Kubernetes infrastructure, turn on the feature flag `CI_USE_BUILDX_ON_K8`. To enable this flag, contact [Harness Support](mailto:[email protected]).

:::

1. Open your [Build and Push an image to Docker Registry](/docs/continuous-integration/use-ci/build-and-upload-artifacts/build-and-push/build-and-push-to-docker-registry/) step.
2. Open the **Optional Configuration** dropdown at the bottom of the step.
3. Add two variables under **Environment Variables**.
4. Enter `PLUGIN_PLATFORM` for your first **Key**.
5. Then, enter your architectures as a comma separated list as your **Value**. For example, `linux/amd64,linux/arm64`.
6. Enter `PLUGIN_BUILDER_DRIVER` for your second variable's **Key**.
7. Then, enter `docker-container` for your second variable's **Value**.

## Deprecated Methods
<details>
<summary>Deprecated method of building multi-arch images on Kubernetes infrastructure</summary>

:::info

The following method for building multi-arch images is not recommended.

:::

To build multi-architecture images in a CI pipeline, use a separate stage to build and push each architecture.

For example, the following pipeline has two stages. The two stages have similar components, but they differ according to the architecture of the image that the stage builds. Each stage has:
Expand Down Expand Up @@ -146,3 +189,5 @@ pipeline:
limits:
memory: 100M
```

</details>