Waymark / Routes / docker Limit block I/O (blkio) for a Docker Compose service
domain: docker · 7 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps Add a `blkio_config:` block to the service. Set relative bandwidth weight with `weight: 500` (allowed range 10-1000, default 500). Tune per-device weight with `weight_device: - path: /dev/sda weight: 500`. Cap bytes/sec with device_read_bps or device_write_bps, each an entry `path:` + `rate:` (integer bytes or a string like '12mb'). Cap operations/sec with device_read_iops or device_write_iops, each an entry `path:` + integer `rate:`. Run `docker compose up -d` to apply. Official docs: https://docs.docker.com/reference/compose-file/services/#blkio_config Known gotchas blkio limits apply on hosts running a supported cgroup/cgroup2 filesystem; unsupported hosts ignore them. weight must be between 10 and 1000; values outside the range fail validation. device_read_bps/device_write_bps accept a byte STRING like '12mb' or 20kb; device_read_iops/device_write_iops accept only an integer operations rate. Device paths (/dev/sda etc.) must exist on the host; pointing at a non-existent device is silently ineffective.
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