docs(development): describe the multi-arch default of make image - #711
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cozystack now builds package images for linux/amd64 and linux/arm64 unless PLATFORM is set, which needs a builder that supports both. LOAD=1 builds for the host only, and talos and testing always build amd64. The development page showed a two-platform builder without saying why it is needed or how to build a single architecture. Assisted-by: LLM Signed-off-by: Aleksei Sviridkin <f@lex.la>
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Aleksei Sviridkin (lexfrei)
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## What this PR does Package images can now be built for amd64 and arm64 in one `make image`, and a published build is multi-arch unless `PLATFORM` says otherwise. This is the build half of arm64 support from #1961 and #903. CI still publishes amd64 only until it gets a native arm64 leg, which comes in a separate PR. Builder stages now run on the build platform and compile for the target one, so Go never runs under emulation. Under emulation it is slow and it crashes: the migration-controller Dockerfile already records a "bad pointer in Go heap" from exactly that. On top of this, `PLATFORM` defaults to `linux/amd64,linux/arm64`. A build on an arm64 workstation can't publish an arm64-only digest any more. That happened once already, the cilium pin was arm64-only until 3f36a1b rebuilt it by hand. Two images were only right because they were emulated. On a native builder they would ship the wrong architecture. token-proxy ran `go build` with no GOARCH, and kube-ovn calls upstream `make build-go`, which hardcodes `GOARCH=amd64`. Both are fixed now. The new bats test wants every compiling stage on `$BUILDPLATFORM` and actually using `TARGETARCH`. A bare `ARG TARGETARCH` does not count, this is how token-proxy got through. Some things stay amd64. talos and testing pin it with `override`, because matchbox serves amd64 Talos assets and the sandbox runs `qemu-system-x86_64`. `LOAD=1` builds for the host only, since the classic docker image store can't load an index. Every CI build job pins `PLATFORM: linux/amd64`, so CI output does not change. This changes local builds. A `make image` on the default docker driver with the classic image store now fails with "Multi-platform build is not supported for the docker driver", where before it built for the host. Use a `docker-container` builder (`BUILDER=<name>`), or pass `PLATFORM=linux/amd64` (or `LOAD=1`) to build one architecture. I checked it on an arm64 host with a docker-container builder. cozystack-api, dashboard, kubeovn, platform-migrations, cilium and capi-providers-cpprovider build and push as amd64+arm64 indexes. Binaries pulled from each platform are x86-64 and aarch64: cozystack-api, token-proxy, the kamaji provider manager, cilium-agent and all four kube-ovn binaries. piraeus-server builds for both platforms, but the push to my test registry failed on registry 500s. The capi-providers-cpprovider inline cache works with a multi-platform push. Not covered is running the arm64 images on an arm64 cluster, CI has none. This is stacked on #4485 and targets its branch, so the diff here is only the two commits on top. ### Screenshots No UI changes. ### Downstream repositories - [ ] No downstream repository is affected by this change - [x] [cozystack/website](https://github.com/cozystack/website) - follow-up: cozystack/website#711 - [ ] [cozystack/terraform-provider-cozystack](https://github.com/cozystack/terraform-provider-cozystack) - follow-up: - [ ] [cozystack/ansible-cozystack](https://github.com/cozystack/ansible-cozystack) - follow-up: - [ ] [cozystack/ccp](https://github.com/cozystack/ccp) - follow-up: - [ ] [cozystack/talm](https://github.com/cozystack/talm) - follow-up: - [ ] [cozystack/cozyhr](https://github.com/cozystack/cozyhr) - follow-up: - [ ] [cozystack/cozy-proxy](https://github.com/cozystack/cozy-proxy) - follow-up: - [ ] [cozystack/cozystack-telemetry-server](https://github.com/cozystack/cozystack-telemetry-server) - follow-up: - [ ] [cozystack/external-apps-example](https://github.com/cozystack/external-apps-example) - follow-up: - [ ] [cozystack/examples](https://github.com/cozystack/examples) - follow-up: - [ ] [cozystack/community](https://github.com/cozystack/community) - follow-up: ### Release note ```release-note feat(build): package images build for linux/amd64 and linux/arm64 by default, with Go builders cross-compiling on the build platform; a local `make image` now needs a docker-container builder, or PLATFORM=linux/amd64 / LOAD=1 for a single architecture. CI still publishes amd64. ``` <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Build Improvements** * Container image builds now target both amd64 and arm64 by default when building without loading images locally. * CI and release builds are pinned to amd64; Talos and testing images remain amd64-only. * Cross-platform builds now compile on the builder’s native platform while targeting the requested architecture. * **Documentation** * Clarified platform defaults and architecture requirements for local and CI builds. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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The development page should say that
make imagenow builds for linux/amd64 and linux/arm64 by default. That change is cozystack/cozystack#4498. The Buildx section already showed a builder with both platforms, but it never explained why. It also didn't say how to build a single architecture or whatLOAD=1does now.I only changed
next/, because released versions still build the old way. I'll keep this as a draft until the cozystack change is merged, so the page doesn't describe behaviour that main doesn't have yet.