41 lines
1.4 KiB
Markdown
41 lines
1.4 KiB
Markdown
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# nixos-tvix-cache
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This is a fetch-through mirror of cache.nixos.org, hosted by NumTide.
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The current machine is a SX65 Hetzner dedicated server with 4x22TB SATA disks,
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and 2x1TB NVMe disks.
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The goals of this machine:
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- Exercise tvix-store and nar-bridge code
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- Collect usage metrics (see [Grafana](https://nixos.tvix.store/grafana))
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- Identify bottlenecks in the current implementations and fix them
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- Replace cache.nixos.org?
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You can configure this as a Nix substitutor on your systems like this:
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```nix
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nix.settings.substituters = lib.mkForce [
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"https://nixos.tvix.store"
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];
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```
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For store paths it hasn't already seen yet, it'll internally ingest its contents
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into tvix-castore (deduplicating in doing so).
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Requests for NARs will dynamically reassemble the NAR representation on demand.
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Metadata and signatures are preserved (which is why you don't need to add
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additional trusted keys).
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We need to produce the same data bit by bit, else the signature check in your
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Nix/Lix client would fail.
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Be however aware that there's zero availability guarantees.
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We will frequently redeploy this box, and it might become unavailable without
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prior notice.
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Tvix currently doesn't have garbage collection. If we run out of disk space, we
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might either move things to a bigger box or delete everything on it so far.
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As it's only a cache, it should however re-ingest things again.
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