Continuous Integration systems are as varied as the companies that use them. Fortunately, Earthly is flexible enough to fit into most (and where we don't, let us know!). This document serves as a starting point to configuring Earthly in your CI environment.
Setting up Earthly is as easy as three steps:
We also have instructions for specific CI systems; and special-case instructions for other scenarios (explore the "CI Integrations" category.)
Earthly has two software dependencies:
earthly will not install these for you, please ensure they are present before proceeding. These tools are very common, so many environments will already have them installed. If you choose to use our pre-built containers, these dep
docker is used to glean information about the containerization environment, and manage our
earthly-buildkitd daemon. It is also used to do things like save images locally on your machine after they have been built by Earthly. To install
docker, use the most recent versions directly from Docker. The versions packaged for many distributions tend to fall behind.
git is used to help fetch remote targets, and also provides metadata for Earthly during your build. To install
git, you can typically use your distributions package manager.
Once you have ensured that the dependencies are available, you'll need to install
This is the simplest method for adding
earthly to your CI. It will work best on dedicated computers, or in scripted/auto-provisioned build environments. You can pin it to a specific version like so:
wget https://github.com/earthly/earthly/releases/download/v0.5.20/earthly-linux-amd64 -O /usr/local/bin/earthly && \chmod +x /usr/local/bin/earthly && \/usr/local/bin/earthly bootstrap
It is recommended to install
earthly as part of the new host's configuration, and not as part of your build. This will speed up your builds, since you do not need to download
earthly each time; and it will also provide stability in case a future version of
earthly changes the behavior of a command.
Don't forget to run
earthly bootstrap when you are done to finish configuration!
If a local installation isn't possible, Earthly currently offers two official images:
earthly/earthly, which is a 1-stop shop. It includes a built-in
earthly-buildkitd daemon, and accepts a target to be built as a parameter. It requires a mount for your source code, and an accessible
earthly/buildkitd, which is the same
earthly-buildkitd container that
earthly will run on your host. This is useful in more advanced configurations, such as sharing a single
buildkitd machine across many workers, or isolating the privileged parts of builds. It's still experimental, but you can find out more about how to do it here..
If you need to provide additional configuration or tools, consider building your own image for CI.
earthly is fairly configurable by itself, it also depends on the configuration of its dependencies. In a CI environment, you will need to ensure all of them are configured correctly.
If you plan to build any private, or otherwise secure repositories,
git will need to be configured to have access to these repositories. Please see our documentation for how to configure access.
docker also needs to be configured to have access to any private repositories referenced in the
Earthfiles you want to build. Please our documentation for how to log in, and our examples for pushing to many popular repositories.
If your private registry can use a credential helper, configure it according to your vendor's instructions.
earthly can also make use of these to provide access when needed. If you need help configuring
docker for use with Earthly, see our guides on configuring many popular registries for details.
earthly-buildkitd daemon requires running in
--privileged mode, which means that the
docker daemon needs to be configured to allow this as well. Rootless configurations are currently unsupported.
earthly has quite a few configuration options that can either be set through a configuration file or environment variables. See our configuration reference for a complete list of options.
You can also configure
earthly by using the
earthly config command from within a script. This can be useful for some dynamic configuration.
Some options that may make sense in a CI environment are:
In some environments, the MTU externally may be different than the MTU on the internal CNI network, causing the internet to be unavailable. This lets you configure the internal network for when
Lets you force on/off the ANSI color codes. Use this when
Use this when you have an external buildkit instance you would like to use instead of the one
Earthly also has some special command-line switches to ensure best practices are followed within your CI. These come highly recommended. Enable these with the
--ci option, which is shorthand for
Earthly also has a special
--push option that can be used when invoking a target. In a CI, you may want to ensure this flag is present to push images or run commands that are not typically done as part of a normal development workflow.
If you would like to do cross-platform builds, you will need to install some
binfmt_misc entries. This can be done by running:
docker run --rm --privileged multiarch/qemu-user-static --reset -p yes. This installs the needed entries and
qemue-user-static binaries on your system. This will need to be repeated on each physical box (only once, since its a kernel level change, and the kernel is shared across containers).
earthly depends on the availability of an
earthly-buildkit daemon to perform its build. This daemon has some networking and security considerations.
Large builds can generate many
docker pull requests for certain images. You can setup and use a pull through cache to circumvent this.
earthly is running on a dedicated host, the only consideration to take is the ability to run the container in a
--privileged mode. Typical installations should support this out of the box. We also support running under user namespaces, when
earthly is configured to start the
earthly-buildkit container with the
--userns host option. Rootless configurations are currently unsupported.
earthly is connecting to a remote
earthly-buildkitd, then you will need to take additional steps. See this article for running a remote buildkit instance.
Below are links to CI systems that we have more specific information for. If you run into anything in your CI that wasn't covered here, we would love to add it to our documentation. Pull requests are welcome!