134 lines
4.9 KiB
Markdown
134 lines
4.9 KiB
Markdown
### Important: This repository is in an early development phase
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[](https://asciinema.org/a/gPEIEo1NzmDTUu2bEPsUboqmU)
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## BuildKit
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<!-- godoc is mainly for LLB stuff -->
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[](https://godoc.org/github.com/moby/buildkit/client/llb)
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[](https://travis-ci.org/moby/buildkit)
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[](https://goreportcard.com/report/github.com/moby/buildkit)
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BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner.
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Key features:
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- Automatic garbage collection
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- Extendable frontend formats
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- Concurrent dependency resolution
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- Efficient instruction caching
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- Build cache import/export
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- Nested build job invocations
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- Distributable workers
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- Multiple output formats
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- Pluggable architecture
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Read the proposal from https://github.com/moby/moby/issues/32925
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#### Quick start
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BuildKit daemon can be built in two different versions: one that uses [containerd](https://github.com/containerd/containerd) for execution and distribution, and a standalone version that doesn't have other dependencies apart from [runc](https://github.com/opencontainers/runc). We are open for adding more backends. `buildd` is a CLI utility for serving the gRPC API.
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```bash
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# buildd daemon (choose one)
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go build -o buildd-containerd -tags containerd ./cmd/buildd
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go build -o buildd-standalone -tags standalone ./cmd/buildd
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# buildctl utility
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go build -o buildctl ./cmd/buildctl
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```
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You can also use `make binaries` that prepares all binaries into the `bin/` directory.
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`examples/buildkit*` directory contains scripts that define how to build different configurations of BuildKit and its dependencies using the `client` package. Running one of these script generates a protobuf definition of a build graph. Note that the script itself does not execute any steps of the build.
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You can use `buildctl debug dump-llb` to see what data is in this definition. Add `--dot` to generate dot layout.
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```bash
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go run examples/buildkit0/buildkit.go | buildctl debug dump-llb | jq .
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```
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To start building use `buildctl build` command. The example script accepts `--target` flag to choose between `containerd` and `standalone` configurations. In standalone mode BuildKit binaries are built together with `runc`. In containerd mode, the `containerd` binary is built as well from the upstream repo.
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```bash
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go run examples/buildkit0/buildkit.go | buildctl build
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```
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`buildctl build` will show interactive progress bar by default while the build job is running. It will also show you the path to the trace file that contains all information about the timing of the individual steps and logs.
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Different versions of the example scripts show different ways of describing the build definition for this project to show the capabilities of the library. New versions have been added when new features have become available.
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- `./examples/buildkit0` - uses only exec operations, defines a full stage per component.
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- `./examples/buildkit1` - cloning git repositories has been separated for extra concurrency.
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- `./examples/buildkit2` - uses git sources directly instead of running `git clone`, allowing better performance and much safer caching.
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- `./examples/buildkit3` - allows using local source files for separate components eg. `./buildkit3 --runc=local | buildctl build --local runc-src=some/local/path`
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- `./examples/dockerfile2llb` - can be used to convert a Dockerfile to LLB for debugging purposes
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- `./examples/gobuild` - shows how to use nested invocation to generate LLB for Go package internal dependencies
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#### Examples
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##### Starting the buildd daemon:
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```
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buildd-standalone --debug --root /var/lib/buildkit
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```
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##### Building a Dockerfile:
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```
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buildctl build --frontend=dockerfile.v0 --local context=. --local dockerfile=.
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```
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`context` and `dockerfile` should point to local directories for build context and Dockerfile location.
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##### Exporting resulting image to containerd
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Containerd version of buildd needs to be used
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```
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buildctl build ... --exporter=image --exporter-opt name=docker.io/username/image
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ctr --namespace=buildkit images ls
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```
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##### Exporting build result back to client
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```
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buildctl build ... --exporter=local --exporter-opt output=path/to/output-dir
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```
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#### View build cache
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```
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buildctl du -v
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```
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#### Supported runc version
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During development buildkit is tested with the version of runc that is being used by the containerd repository. Please refer to [runc.md](https://github.com/containerd/containerd/blob/d1e11f17ec7b325f89608dd46c128300b8727d50/RUNC.md) for more information.
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#### Contributing
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Running tests:
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```bash
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make test
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```
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Updating vendored dependencies:
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```bash
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# update vendor.conf
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make vendor
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```
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Validating your updates before submission:
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```bash
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make validate-all
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```
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