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BuildKit's default GC caps the ephemeral cache tier — `RUN --mount=type=cache` mounts, local build context, git checkouts — at a hardcoded **512 MB** (shown as `488.3 MiB` in `buildx inspect`). Across our 7-distro build matrix that fills instantly and forces re-downloads of system + R packages on every rebuild. ## Changes - **`docker/buildkitd.toml`** (new) — GC config passed via `--config` when creating the `docker-container` builders `artemis` (amd64) and `gaia` (arm64): - cache-mount tier: **512 MB → 8 GB**, retained 7 days - total cache bounded at **40 GB** with **20 GB min-free** - **`justfile`** — document the `--config docker/buildkitd.toml` flag on the builder-create commands so a recreate does not silently revert to the 512 MB default. ## Notes - Limits are absolute (not `%`) because the two hosts differ ~6× in free space (Hetzner ~42 GiB free vs Mac mini ~279 GiB). The 20 GB min-free is the safety valve on the disk-tight Hetzner host; the old default wanted 64 GiB free, which does not exist there. - Both live builders were already recreated with this config and verified running. Reviewed-on: #112
41 lines
1.7 KiB
TOML
41 lines
1.7 KiB
TOML
# BuildKit GC config for the remote buildx builders (artemis/amd64, gaia/arm64).
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#
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# Apply when creating the docker-container builders:
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# docker buildx create --name artemis --driver docker-container \
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# --config docker/buildkitd.toml ssh://<user@host-amd64>
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# docker buildx create --name gaia --driver docker-container \
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# --config docker/buildkitd.toml ssh://<user@host-arm64>
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#
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# Why: BuildKit's default GC caps the ephemeral cache tier — RUN
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# --mount=type=cache mounts, local build context, git checkouts — at a
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# hardcoded 512 MB (shown as "488.3 MiB" in `buildx inspect`). Across our
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# 7-distro build matrix that fills instantly and forces re-downloads of
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# system + R packages every rebuild. The first rule below raises that tier.
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#
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# Limits are absolute (not %) on purpose: artemis and gaia have very
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# different free space (Hetzner ~42 GiB free vs Mac mini ~279 GiB), so a
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# percentage would mean wildly different real budgets. minFreeSpace = 20 GB
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# keeps the tight Hetzner host safe while staying modest on the Mac mini.
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[worker.oci]
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gc = true
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# Tier 1 — ephemeral caches (cache mounts, local context, git checkouts).
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# Raised from the 512 MB default to 8 GB, retained for 7 days so weekly
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# rebuilds reuse downloaded packages instead of re-fetching them.
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[[worker.oci.gcpolicy]]
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filters = [
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"type==source.local",
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"type==exec.cachemount",
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"type==source.git.checkout",
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]
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keepDuration = "168h"
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maxUsedSpace = "8GB"
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# Tier 2 — everything else (image layers, RUN exec results). Bounds the
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# whole buildkit cache and always leaves 20 GB free on the host disk.
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[[worker.oci.gcpolicy]]
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all = true
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reservedSpace = "2GB"
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maxUsedSpace = "40GB"
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minFreeSpace = "20GB"
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