Buildfarm

Overview

Buildfarm is ranked #18 of 23 in build cache software on Specifiction. It runs on API, Linux, Self-hosted.

Compared on build cache software

Cache scope

remotebuildfarm.github.io

Self-hosted option

Yesbuildfarm.github.io

Supported build systems

Bazel, buck2, Pantsbuildfarm.github.io

Compiler/language support

C++buildfarm.github.io

Remote execution

Yesbuildfarm.github.io

Open source

Yesbuildfarm.github.io

Facts

Purpose

Buildfarm implements the Remote Execution API for remote caching and execution.buildfarm.github.io · 5 Oct 2026

Build system compatibility

The project says it is compatible with Bazel, Buck2, Pants, and other build systems that support the API.github.com · 5 Oct 2026

Caching and execution

Buildfarm can retain content in a Content Addressable Storage, cache ActionResults, and execute actions asynchronously.buildfarm.github.io · 5 Oct 2026

CAS features

Documented features include configurable instances, progressive and flow controlled CAS reads and writes, pluggable external CAS endpoints, and RequestMetadata attribution.buildfarm.github.io · 5 Oct 2026

Worker roles

Workers can perform execution, serve as CAS shards, or do both; a worker requires local filesystem storage.buildfarm.github.io · 5 Oct 2026

Storage options

Buildfarm documents in-memory, external gRPC, HTTP/1 proxy, persistent worker disk, and sharded CAS implementations.buildfarm.github.io · 5 Oct 2026

Backplane requirement

Buildfarm requires a backplane for information shared between cluster members, and the quick start uses Redis.buildfarm.github.io · 5 Oct 2026

Security

The authentication guide describes configuring client/server authentication with self-signed TLS certificates.buildfarm.github.io · 5 Oct 2026

Sandboxing

Configuration can require actions to use a sandbox, and supports settings for cgroups and an as-nobody wrapper.buildfarm.github.io · 5 Oct 2026

Metrics

The quick start documents a Prometheus metrics endpoint configurable for the server and worker.buildfarm.github.io · 5 Oct 2026

Deployment scale

The quick start says deployments can spread servers and workers across machines and describes use by hundreds or thousands of developers or CI processes.buildfarm.github.io · 5 Oct 2026

Setup

The quick start demonstrates running the service on Linux and provides a container-based startup option.buildfarm.github.io · 5 Oct 2026

Support

The project repository directs users to file bugs or feature requests as issues and ask questions in the build team Slack channel.github.com · 5 Oct 2026

Notable limitation

The worker documentation says the Fuse execution filesystem is experimental and may be unreliable under substantial load.buildfarm.github.io · 5 Oct 2026

Product

Buildfarm is a software stack implementing the Remote Execution API for remote content storage, action-result caching, and asynchronous action execution.buildfarm.github.io · 5 Oct 2026

Build systems

The project says it is compatible with Bazel, buck2, Pants, and other build systems that use the Remote Execution API.github.com · 5 Oct 2026

Architecture

Workers can perform execution and CAS shard roles, and either role can be disabled in configuration.buildfarm.github.io · 5 Oct 2026

CAS options

Buildfarm documents in-memory storage, an external CAS proxy, an HTTP/1 proxy, and persistent worker disk storage as CAS implementations.buildfarm.github.io · 5 Oct 2026

Feature support

The project lists configurable instances, progressive and flow-controlled CAS reads and writes, pluggable external CAS endpoints, and RequestMetadata behavior attribution among its supported features.buildfarm.github.io · 5 Oct 2026

Execution controls

Execution policies can modify or control worker actions, including wrapper policies such as running actions through the Linux sandbox or as the nobody user.buildfarm.github.io · 5 Oct 2026

Resource limits

Workers can use Linux cgroups to limit execution resources, and the documentation says this feature requires OS-specific cgroups support available in Linux.buildfarm.github.io · 5 Oct 2026

Backplane dependency

Buildfarm requires a backplane for information shared between cluster members, and its quick start uses Redis for that role.buildfarm.github.io · 5 Oct 2026

Deployment

The project documents running Buildfarm server and worker processes, using containers for a minimal cluster, and installing an OCI bundled Helm chart.buildfarm.github.io · 5 Oct 2026

Scale

The quick start says deployments can spread services across machines and may serve hundreds or thousands of developers or CI processes.buildfarm.github.io · 5 Oct 2026

License

The project repository identifies its license as Apache-2.0.github.com · 5 Oct 2026

Experimental limitation

The worker documentation says FuseCAS is experimental and may not work reliably over long periods or under substantial load.buildfarm.github.io · 5 Oct 2026

Where it ranks on Specifiction

• Best Build Cache Software in 2026#18 of 23

Sources

• buildfarm.github.io/buildfarm/· checked 5 Oct 2026
• github.com/buildfarm/buildfarm· checked 5 Oct 2026
• buildfarm.github.io/buildfarm/docs/features/· checked 5 Oct 2026
• buildfarm.github.io/buildfarm/docs/architecture/workers/· checked 5 Oct 2026
• buildfarm.github.io/buildfarm/docs/architecture/content_add· checked 5 Oct 2026
• buildfarm.github.io/buildfarm/docs/quick_start/· checked 5 Oct 2026
• buildfarm.github.io/buildfarm/docs/configuration/authentica· checked 5 Oct 2026
• buildfarm.github.io/buildfarm/docs/configuration/configurat· checked 5 Oct 2026
• buildfarm.github.io/buildfarm/docs/execution/execution_poli· checked 5 Oct 2026
• buildfarm.github.io/buildfarm/docs/execution/execution_limi· checked 5 Oct 2026