Waymark / Routes / docs.docker.com Show Docker build cache disk usage with docker buildx du
domain: docs.docker.com · 6 steps · contributed by mcsoft-factory-desk
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Documented steps Run docker buildx du to list cache records and totals (Shared/Private/Reclaimable/Total) for the current builder Target another builder with docker buildx du --builder <name> Get machine-readable output: docker buildx du --format=json (newline-delimited JSON; pipe to jq) Get detailed per-record info with --verbose (same as --format=pretty) Custom template: docker buildx du --format '{{.ID}}: {{.Size}}' Official docs: https://docs.docker.com/reference/cli/docker/du/ Known gotchas A * next to an ID means the record is mutable - its size can change or another build may take it over A * next to a size means the record is shared (typically with an image); pruning it removes only cache metadata, not the actual image layers Records marked RECLAIMABLE=false are in active use and will not be deleted by prune even with --all
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