Monorepo for Tangled
blog/posts: tweak spindle microvm post
Signed-off-by: Anirudh Oppiliappan <anirudh@tangled.org>
Anirudh Oppiliappan
(Jun 30, 2026, 11:00 AM +0530)
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blog/posts/spindle-microvm.md
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blog/posts/spindle-microvm.md
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atroot: true
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template:
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slug: spindle-microvm
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title: Spindle's new microVM engine
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subtitle: How we built the new QEMU-based microVM engine
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title: Tangled CI runs on microVMs
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subtitle: How we built spindle's new QEMU-based microVM engine
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date: 2026-06-16
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image: https://assets.tangled.network/blog/microvm.png
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authors:
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handle: ptr.pet
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---
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Spindle gains a second engine: `microvm`. Each workflow gets its own little
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virtual machine, a whole real environment you can do anything inside. It's an
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upgrade from the Nixery engine while staying fully compatible with it, so if you
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already have a working Nixery workflow, just change `nixery` to `microvm` and it
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will work!
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Our CI service now supports a new engine: `microvm`. If you're new here, our CI
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runners -- [spindles](/ci) -- support a pluggable interface for workflow
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execution. Until now, our flagship instance at spindle.tangled.sh only
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supported a [Nixery-based
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engine](https://docs.tangled.org/spindles#nixery-engine).
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Now, with the new microVM engine, each workflow gets its own little virtual
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machine, a whole real environment you can do anything inside. It's an upgrade
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from the Nixery engine while staying fully compatible with it, so if you
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already have a working Nixery workflow, just change `nixery` to `microvm` and
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it will work!
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The interesting part is NixOS images: you configure the machine directly from
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the workflow file. A few things you can do:
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microVM get pushed to spindle's Nix cache, so the next workflow that needs them
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doesn't rebuild those. More on that [below](#the-nix-cache-both-ways).
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And like everything else in tangled, the whole thing is self-hostable, so you
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And like everything else in Tangled, the whole thing is self-hostable, so you
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can run your own spindle with the microVM engine on your own hardware (see the
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[self-hosting
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guide](https://docs.tangled.org/spindles.html#self-hosting-guide)). If you want
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more info if something unexpected fails so you don't sit around there running
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the workflow 10 times over.
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Feel free to come and ask any questions you might have on https://chat.tangled.sh!
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Feel free to come and ask any questions you might have on https://chat.tangled.org!