Bazel Buildfarm

This repository hosts the Bazel remote caching and execution system.

Background information on the status of caching and remote execution in bazel can be found in the bazel documentation.

File issues here for bugs or feature requests, and ask questions via build team slack in the #buildfarm channel.

Buildfarm Docs

Usage

All commandline options override corresponding config settings.

Redis

Run via

$ docker run -d --rm --name buildfarm-redis -p 6379:6379 redis:7.2.4
redis-cli config set stop-writes-on-bgsave-error no

Bazel Buildfarm Server

Run via

$ bazelisk run //src/main/java/build/buildfarm:buildfarm-server -- <logfile> <configfile>

Ex: bazelisk run //src/main/java/build/buildfarm:buildfarm-server -- --jvm_flag=-Djava.util.logging.config.file=$PWD/examples/logging.properties $PWD/examples/config.minimal.yml

logfile has to be in the standard java util logging format and passed as a --jvm_flag=-Dlogging.config=file: configfile has to be in yaml format.

Bazel Buildfarm Worker

Run via

$ bazelisk run //src/main/java/build/buildfarm:buildfarm-shard-worker -- <logfile> <configfile>

Ex: bazelisk run //src/main/java/build/buildfarm:buildfarm-shard-worker -- --jvm_flag=-Djava.util.logging.config.file=$PWD/examples/logging.properties $PWD/examples/config.minimal.yml

logfile has to be in the standard java util logging format and passed as a --jvm_flag=-Dlogging.config=file: configfile has to be in yaml format.

Bazel Client

To use the example configured buildfarm with bazel (version 1.0 or higher), you can configure your .bazelrc as follows:

$ cat .bazelrc
$ build --remote_executor=grpc://localhost:8980

Then run your build as you would normally do.

Debugging

Buildfarm uses Java's Logging framework and outputs all routine behavior to the NICE Level.

You can use typical Java logging configuration to filter these results and observe the flow of executions through your running services. An example logging.properties file has been provided at examples/logging.properties for use as follows:

$ bazel run //src/main/java/build/buildfarm:buildfarm-server -- --jvm_flag=-Djava.util.logging.config.file=$PWD/examples/logging.properties $PWD/examples/config.minimal.yml

and

$ bazel run //src/main/java/build/buildfarm:buildfarm-shard-worker -- --jvm_flag=-Djava.util.logging.config.file=$PWD/examples/logging.properties $PWD/examples/config.minimal.yml

To attach a remote debugger, run the executable with the --debug=<PORT> flag. For example:

$ bazel run //src/main/java/build/buildfarm:buildfarm-server -- --debug=5005 $PWD/examples/config.minimal.yml

Third-party Dependencies

Most third-party dependencies (e.g. protobuf, gRPC, ...) are managed automatically via rules_jvm_external. These dependencies are enumerated in the WORKSPACE with a maven_install artifacts parameter.

Things that aren't supported by rules_jvm_external are being imported as manually managed remote repos via the WORKSPACE file.

Deployments

Buildfarm can be used as an external repository for composition into a deployment of your choice. See also the documentation site in the Worker Execution Environment section.

Add the following to your MODULE.bazel to get access to buildfarm targets, filling in the <COMMIT-SHA> values:

bazel_dep(name = "build_buildfarm")
git_override(
    module_name = "build_buildfarm",
    commit = "<COMMIT-SHA>",
    remote = "https://github.com/bazel/bazel-buildfarm.git",
)

# Transitive!
# TODO: remove this after https://github.com/bazelbuild/remote-apis/pull/293 is merged
bazel_dep(name = "remoteapis", version = "eb433accc6a666b782ea4b787eb598e5c3d27c93")
archive_override(
    module_name = "remoteapis",
    integrity = "sha256-68wzxNAkPZ49/zFwPYQ5z9MYbgxoeIEazKJ24+4YqIQ=",
    strip_prefix = "remote-apis-eb433accc6a666b782ea4b787eb598e5c3d27c93",
    urls = [
        "https://github.com/bazelbuild/remote-apis/archive/eb433accc6a666b782ea4b787eb598e5c3d27c93.zip",
    ],
)

bazel_dep(name = "googleapis", version = "0.0.0-20240326-1c8d509c5", repo_name = "com_google_googleapis")
bazel_dep(name = "grpc-java", version = "1.62.2")

googleapis_switched_rules = use_extension("@com_google_googleapis//:extensions.bzl", "switched_rules")
googleapis_switched_rules.use_languages(
    grpc = True,
    java = True,
)
use_repo(googleapis_switched_rules, "com_google_googleapis_imports")

You can then use the existing layer targets to build your own OCI images, for example:

oci_image(
    name = "mycompany-buildfarm-server",
    base = "@<YOUPROVIDE>",
    entrypoint = [
        "/usr/bin/java",
        "-jar",
        "/app/build_buildfarm/buildfarm-server_deploy.jar",
    ],
    tars = [
        "@build_buildfarm//:layer_buildfarm_server",
    ],
)

where @<YOUPROVIDE> is the name of an oci.pull(name = 'YOUPROVIDE', ...) in your MODULE.bazel

Helm Chart

To install OCI bundled Helm chart:

helm install \
  -n bazel-buildfarm \
  --create-namespace \
  bazel-buildfarm \
  oci://ghcr.io/bazelbuild/buildfarm \
  --version "0.2.4"