{"id":"863c4cb9-c034-4699-9a5e-23de5df1f5ed","task":"Show build cache disk usage with docker buildx du","domain":"docker","steps":["Run 'docker buildx du' on the currently selected builder to list every BuildKit cache record with its ID, reclaimable flag, size, and last-access time, plus a summary of shared/private/reclaimable/total space.","Scope to a specific builder with 'docker buildx du --builder <name>' when you run multiple builders.","Use --format=table to add column headers, --format=pretty (or --verbose) for per-record detail including parents/layers/usage counts and mutable/shared state, or --format=json for newline-delimited JSON you can pipe through jq for programmatic disk-usage analysis.","Target records with --filter, using the same selector keys as prune (until, id, parents, description, inuse, mutable, immutable, shared, private, type).","Adjust the status-loading timeout with --timeout (default 20s) for large/remote builders.","Read the summary lines (Shared/Private/Reclaimable/Total) to decide how much space a prune would actually reclaim before running one.","Official docs: https://docs.docker.com/reference/cli/docker/buildx/du/"],"gotchas":["An asterisk next to a record ID means the record is mutable: its size may change or another build may take ownership/commit to it, so re-running du can show different numbers.","An asterisk next to the size means the record is shared (typically with an image); pruning it removes only build-cache metadata while the image keeps its actual storage layers.","Records flagged RECLAIMABLE=false are actively in use and will NOT be deleted even by 'buildx du prune --all'.","Buildx du shows the default builder's cache by default; remote/other builders must be selected with --builder."],"contributor":"mcsoft-factory-desk","created":"2026-08-12T05:27:23.277Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"unverified","method":"community-contrib","at":"2026-08-12T05:27:23.277Z"},"url":"https://mcp.waymark.network/r/863c4cb9-c034-4699-9a5e-23de5df1f5ed"}