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improve documentation for multi-architecture builds (#59)

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Erik Agterdenbos 2021-06-15 11:53:58 +02:00 committed by GitHub
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@ -25,7 +25,7 @@ After building your image, use [push-to-registry](https://github.com/redhat-acti
| Input Name | Description | Default |
| ---------- | ----------- | ------- |
| archs | Architecture(s) to build the image(s) for. For multiple architectures, separate by a comma. Refer to [Multi arch builds](#multi-arch-builds) to setup the `qemu-user-static` dependency. | `amd64`
| archs | Architecture(s) to build the image(s) for. For multiple architectures, separate by a comma. Refer to [Multi arch builds](#multi-arch-builds) to setup the `qemu-user-static` dependency. | None (host architecture)
| build-args | Build arguments to pass to the Docker build using `--build-arg`, if using a Dockerfile that requires ARGs. Use the form `arg_name=arg_value`, and separate arguments with newlines. | None
| context | Path to directory to use as the build context. | `.`
| dockerfiles | The list of Dockerfile paths to perform a build using docker instructions. This is a multiline input to allow multiple Dockerfiles. | **Must be provided**
@ -41,7 +41,7 @@ After building your image, use [push-to-registry](https://github.com/redhat-acti
| Input Name | Description | Default |
| ---------- | ----------- | ------- |
| archs | Architecture(s) to build the image(s) for. For multiple architectures, separate by a comma. Refer to [Multi arch builds](#multi-arch-builds) to setup the `qemu-user-static` dependency. | `amd64`
| archs | Architecture(s) to build the image(s) for. For multiple architectures, separate by a comma. | None (host architecture)
| base-image | The base image to use for the container. | **Must be provided**
| content | Paths to files or directories to copy inside the container to create the file image. This is a multiline input to allow you to copy multiple files/directories.| None
| entrypoint | The entry point to set for the container. This is a multiline input; split arguments across lines. | None
@ -146,10 +146,11 @@ jobs:
## Multi arch builds
If building for an architecture other than `amd64`, install `qemu-user-static` using the following command.
Cross-architecture builds from dockerfiles containing `RUN` instructions require `qemu-user-static` emulation registered in the Linux kernel. Run `sudo apt install -y qemu-user-static` on Debian-based container hosts. Or run the following registration command for other distributions:
```
sudo podman run --rm --privileged multiarch/qemu-user-static --reset -p yes
sudo podman run --rm --privileged docker.io/tonistiigi/binfmt --install all
```
The registration remains active until the container host reboots.
## Using private images