Custom build arguments

[apeman76]

Is it possible to set custom arguments to dockman that will be used whenever a image is built? I need to set
--cpu-period=100000
--cpu-quota=100000
so my CPU doesn't get hogged to a 100% while the build is running because it causes issues but I dont see a option to do so

[cerede2000]

Thanks for the question, and sorry it went unanswered for so long.

--cpu-period / --cpu-quota belong to the legacy docker build builder. Compose builds go through BuildKit (via Buildx bake), which ignores them, and a compose file's build: section has no way to express them, so Dockman had nothing to pass them through.

I've added this to my fork: each host now has optional build limits (CPU cores and memory) in Settings → Docker Hosts → (host) → Build limits. Your --cpu-period=100000 --cpu-quota=100000 is 1 CPU core. When set, every build Dockman runs on that host (Compose stacks with a build: section, from the Deploy tab and Git deployments, and Dockerfile builds from Files) runs in a dedicated BuildKit builder created with those limits, so every RUN step is capped. The builder is created for each build and removed after it, cache kept, so nothing keeps running in between; builds on a limited host run one at a time.

Measured on the published image: a build step running two CPU-bound processes took ~3.5 s unlimited and ~13.5 s capped at 0.5 core: four times less CPU, four times the time, so the build never used more than half a core.

Trade-offs while limits are set: the limited builder has its own cache (the first build after enabling them starts cold), and the image is loaded into Docker at the end of each build, which adds a few seconds. Behind LinuxServer's socket-proxy it also needs ALLOW_ARCHIVE=1. Details: https://github.com/cerede2000/dockman/blob/integration/website/docs/operations/build-limits.md

Test image: ghcr.io/cerede2000/dockman:integration (amd64/arm64). It's a fork build with extra features and database migrations, so please run it against a copy of your /config volume rather than your live one.

Feedback welcome!