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Reposearthly/earthly
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Earthly

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Please note that Earthly is no longer actively maintained. Read more.

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\n \"Earthly\"\n
\n It’s like Docker for builds\n
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🔁 Repeatable Builds - Write builds once, and run them anywhere – on your laptop, remote, and in any CI.

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❤️ Super Simple - Instantly recognizable syntax – like Dockerfile and Makefile had a baby.

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🛠 Compatible with Every Language, Framework, and Build Tool - If it runs on Linux, it runs on Earthly.

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🏘 Great for Monorepos and Polyrepos - Organize your build logic however makes the most sense for your project.

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💨 Fast Builds - Build caching and parallel execution makes builds fast automatically.

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♻️ Reuse, Don't Repeat - Never write the same code in multiple builds again.

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🌎 Earthly is a versatile, approachable CI/CD framework that runs every pipeline inside containers, giving you repeatable builds that you write once and run anywhere. It has a super simple, instantly recognizable syntax that is easy to write and understand – like Dockerfile and Makefile had a baby. And it leverages and augments popular build tools instead of replacing them, so you don’t have to rewrite all your builds no matter what languages you use.

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Table of Contents

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Why Use Earthly?

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🔁 Repeatable Builds

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Earthly runs all builds in containers, making them self-contained, isolated, repeatable, and portable. This allows for faster iteration on build scripts and easier debugging when something goes wrong – no more git commit -m \"try again\". When you write a build, you know it will execute correctly no matter where it runs – your laptop, a colleague’s laptop, or any CI. You don’t have to configure language-specific tooling, install additional dependencies, or complicate your build scripts to ensure they are compatible with different OSs. Earthly gives you consistent, repeatable builds regardless of where they run.

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❤️ Super Simple

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Earthly’s syntax is easy to write and understand. Most engineers can read an Earthfile instantly, without prior knowledge of Earthly. We combined some of the best ideas from Dockerfiles and Makefiles into one specification – like Dockerfile and Makefile had a baby.

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🛠 Compatible with Every Language, Framework, and Build Tool

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Earthly works with the compilers and build tools you use. If it runs on Linux, it runs on Earthly. And you don’t have to rewrite your existing builds or replace your package.json, go.mod, build.gradle, or Cargo.toml files. You can use Earthly as a wrapper around your existing tooling and still get Earthly’s repeatable builds, parallel execution, and build caching.

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🏘 Great for Monorepos and Polyrepos

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Earthly is great for both monorepos and polyrepos. You can split your build logic across multiple Earthfiles, placing some deeper inside the directory structure or even in other repositories. Referencing targets from other Earthfiles is easy regardless of where they are stored. So you can organize your build logic however makes the most sense for your project.

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💨 Fast Builds

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Earthly automatically executes build targets in parallel and makes maximum use of cache. This makes builds fast. Earthly also has powerful shared caching capabilities that speed up builds frequently run across a team or in sandboxed environments, such as Earthly Satellites, GitHub Actions, or your CI.

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If your build has multiple steps, Earthly will:

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  1. Build a directed acyclic graph (DAG).
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  2. Isolate execution of each step.
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  3. Run independent steps in parallel.
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  4. Cache results for future use.
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♻️ Reuse, Don't Repeat

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Never have to write the same code in multiple builds again. With Earthly, you can reuse targets, artifacts, and images across multiple Earthfiles, even ones in other repositories, in a single line. Earthly is cache-aware, based on the individual hashes of each file, and has shared caching capabilities. So you can create a vast and efficient build hierarchy that only executes the minimum required steps.

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Where Does Earthly Fit?

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\"Earthly
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Earthly is meant to be used both on your development machine and in CI. It runs on top of your CI/CD platform (such as Jenkins, Circle CI, GitHub Actions, and GitLab CI/CD). Earthly provides the benefits of a modern build automation system wherever it runs – such as caching and parallelism. It is a glue layer between language-specific build tooling (like maven, gradle, npm, pip, go build) and CI, working like a wrapper around your build tooling and build logic that isolates build execution from the environments they run in.

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How Does It Work?

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In short: containers, layer caching, and complex build graphs!

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Earthly executes builds in containers, where execution is isolated. The dependencies of the build are explicitly specified in the build definition, thus making the build self-sufficient.

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We use a target-based system to help users break up complex builds into reusable parts. Nothing is shared between targets other than clearly declared dependencies. Nothing shared means no unexpected race conditions. In fact, the build is executed in parallel whenever possible, without any need for the user to take care of any locking or unexpected environment interactions.

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ℹ️ Note
\nEarthfiles might seem very similar to Dockerfile multi-stage builds. In fact, the same technology is used underneath. However, a key difference is that Earthly is designed to be a general-purpose build system, not just a Docker image specification. Read more about how Earthly is different from Dockerfiles.

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Installation

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See installation instructions.

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To build from source, check the contributing page.

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Quick Start

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Here are some resources to get you started with Earthly

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See also the full documentation.

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Reference pages

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A simple example (for Go)

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# Earthfile\nVERSION 0.8\nFROM golang:1.15-alpine3.13\nRUN apk --update --no-cache add git\nWORKDIR /go-example\n\nall:\n  BUILD +lint\n  BUILD +docker\n\nbuild:\n  COPY main.go .\n  RUN go build -o build/go-example main.go\n  SAVE ARTIFACT build/go-example AS LOCAL build/go-example\n\nlint:\n  RUN go get golang.org/x/lint/golint\n  COPY main.go .\n  RUN golint -set_exit_status ./...\n\ndocker:\n  COPY +build/go-example .\n  ENTRYPOINT [\"/go-example/go-example\"]\n  SAVE IMAGE go-example:latest
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// main.go\npackage main\n\nimport \"fmt\"\n\nfunc main() {\n  fmt.Println(\"hello world\")\n}
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Invoke the build using earthly +all.

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Examples for other languages are available in the examples dir.

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Features

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⛓ Parallelization that just works

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Whenever possible, Earthly automatically executes targets in parallel.

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💾 Caching that works the same as Docker builds

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🛠 Multi-platform support

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Build for multiple platforms in parallel.

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VERSION 0.8\nall:\n    BUILD \\\n        --platform=linux/amd64 \\\n        --platform=linux/arm64 \\\n        --platform=linux/arm/v7 \\\n        --platform=linux/arm/v6 \\\n        +build\n\nbuild:\n    FROM alpine:3.18\n    CMD [\"uname\", \"-m\"]\n    SAVE IMAGE multiplatform-image
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🤲 Build tools that work everywhere

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No need to ask your team to install protoc, a specific version of Python, Java 1.6, or the .NET Core ecosystem. Install once in your Earthfile, and it works for everyone. Or even better, you can just make use of the rich Docker Hub ecosystem.

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VERSION 0.8\nFROM golang:1.15-alpine3.13\nWORKDIR /proto-example\n\nproto:\n  FROM namely/protoc-all:1.29_4\n  COPY api.proto /defs\n  RUN --entrypoint -- -f api.proto -l go\n  SAVE ARTIFACT ./gen/pb-go /pb AS LOCAL pb\n\nbuild:\n  COPY go.mod go.sum .\n  RUN go mod download\n  COPY +proto/pb pb\n  COPY main.go ./\n  RUN go build -o build/proto-example main.go\n  SAVE ARTIFACT build/proto-example
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See full example code.

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📦 Modern import system

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Earthly can be used to reference and build targets from other directories or even other repositories. For example, if we wanted to build an example target from the github.com/earthly/earthly repository, we could issue

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# Try it yourself! No need to clone.\nearthly github.com/earthly/earthly/examples/go:main+docker\n# Run the resulting image.\ndocker run --rm earthly/examples:go
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🔨 Reference other targets using +

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Use + to reference other targets and create complex build inter-dependencies.

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Examples

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🔑 Cloud secrets support built-in

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Secrets are never stored within an image's layers and they are only available to the commands that need them.

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earthly set /user/github/token 'shhh...'
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release:\n  RUN --push --secret GITHUB_TOKEN=user/github/token github-release upload file.bin
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FAQ

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How is Earthly different from Dockerfiles?

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Dockerfiles were designed for specifying the make-up of Docker images and that's where Dockerfiles stop. Earthly takes some key principles of Dockerfiles (like layer caching) but expands on the use cases. For example, Earthly can output regular artifacts, run unit and integration tests, and create several Docker images at a time - all outside the scope of Dockerfiles.

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It is possible to use Dockerfiles in combination with other technologies (e.g., Makefiles or bash files) to solve such use cases. However, these combinations are difficult to parallelize, challenging to scale across repositories as they lack a robust import system, and often vary in style from one team to another. Earthly does not have these limitations as it was designed as a general-purpose build system.

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For example, Earthly introduces a richer target, artifact, and image referencing system, allowing for better reuse in complex builds spanning a single large repository or multiple repositories. Because Dockerfiles are only meant to describe one image at a time, such features are outside the scope of applicability of Dockerfiles.

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How do I know if a command is a classic Dockerfile command or an Earthly command?

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Check out the Earthfile reference doc page. It has all the commands there and specifies which commands are the same as Dockerfile commands and which are new.

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Can Earthly build Dockerfiles?

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Yes! You can use the command FROM DOCKERFILE to inherit the commands in an existing Dockerfile.

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build:\n  FROM DOCKERFILE .\n  SAVE IMAGE some-image:latest
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You may also optionally port your Dockerfiles to Earthly entirely. Translating Dockerfiles to Earthfiles is usually a matter of copy-pasting and making minor adjustments. See the getting started page for some Earthfile examples.

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How is Earthly different from Bazel?

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Bazel is a build tool developed by Google to optimize the speed, correctness, and reproducibility of their internal monorepo codebase. The main difference between Bazel and Earthly is that Bazel is a build system, whereas Earthly is a general-purpose CI/CD framework. For a more in-depth explanation see our FAQ.

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Contributing

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Licensing

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Earthly is licensed under the Mozilla Public License Version 2.0. See LICENSE.

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