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manual/multi-arch: Mention remote builds

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Zhaofeng Li 2022-02-04 20:58:17 -08:00
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manual/src/examples/multi-arch.md
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# Multi-Architecture Deployments
You can deploy to hosts running different architectures with a single configuration.
This requires you to either [set up remote builders](https://nixos.org/manual/nix/stable/advanced-topics/distributed-builds.html) running the foreign architecture(s), or [set up binfmt emulation](https://nixos.wiki/wiki/NixOS_on_ARM#Compiling_through_QEMU) on the host running Colmena.
There are two ways to achieve this:
## `binfmt` Emulation
## Using `binfmt` Emulation
On Linux hosts, you can run builds through transparent binary emulation using [QEMU and binfmt-misc](https://nixos.wiki/wiki/NixOS_on_ARM#Compiling_through_QEMU).
This following example sets up binfmt, allowing an X86-64 host (`laptop`) to build derivations for an AArch64 host (`rpi`) through QEMU:
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After the new configuration is activated, binfmt emulation will be set up on the local machine.
You can then deploy to the `rpi` node with `colmena apply --on rpi`.
## Building Remotely
If the remote nodes are powerful enough, you may also want to execute builds on them directly.
See [Remote Builds](../features/remote-builds.md) for more details.