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Evergreen

Version 0.9.0 Alpha

Evergreen is a distributed continuous integration system built by MongoDB. It dynamically allocates hosts (via AWS, digitalocean, etc) to run tasks in parallel across many machines at once to decrease the total amount of time needed to complete a test workload.

Using Evergreen, we've significantly enhanced the productivity of our engineers.

Features

Elastic Host Allocation

Use only the computing resources you need.

Clean UI

Easily navigate the state of your tests, logs, and commit history.

Multiplatform Support

Run jobs on Linux (including PowerPC and ZSeries), Windows, OSX, Solaris, and BSD.

Spawn Hosts

Spin up a copy of any machine in your test infrastructure for debugging.

Patch Builds

See test results for your code changes before committing.

Stepback on Failure

Automatically run past commits to pinpoint the origin of a test failure

See the documentation for a full feature list!

Usage

Evergreen requires the configuration of a main server along with a cloud provider or static servers. Please refer to our tutorial for full installation instructions.

System Requirements

The Evergreen Agent and Command Line Tool are supported on Linux, OSX, Windows, and Solaris operating systems. However, the Evergreen API Server, UI Server, and Runner program are currently only supported and tested on Linux and OSX.

Go Requirements

Vendoring Dependencies

Our dependencies live in the vendor subdirectory of the repo, and are managed using glide. To add a new dependency, add the package to glide.yaml and the package name and revision to glide.lock, and run glide install -s. To refresh the entire vendor tree, run make vendor-sync

Building the Binaries

Setup:

  • ensure that your GOPATH environment variable is set.
  • check out a copy of the repo into your gopath. You can use: go get github.com/evergreen-ci/evergreen. If you have an existing checkout of the evergreen repository that is not in $GOPATH/src/github.com/evergreen-ci/ move or create a symlink.
  • run make vendor to set up the vendoring environment.

Possible Targets:

  • run make build to compile all server binaries for your local system.
  • run make agent cli to compile the agent and cli for your local platform.
  • run make agents clis to compile and cross compile all agent and command line interface binaries.
  • run make dist to compile all server, commandline, and agent binaries and create a dist tarball with all artifacts.

Terminology

  • distro: A platform type (e.g. Windows or OSX) plus large-scale architectural details. One of the targets that we produce executables for.
  • host: One of the machines used to run tasks on; typically an instance of a distro that does the actual work (see task). Equivalently, any machine in our system other than MOTU.
  • revision: A revision SHA; e.g. ad8a1d4678122bada9d4479b114cf68d39c27724.
  • project: A branch in a given repository. e.g. master in the mongodb/mongo repository
  • version: (project + revision). A version of a project.
  • buildvariant: build specific information.
  • build: (version + buildvariant) = (project + revision + buildvariant).
  • task: “compile”, “test”, or “push”. The kinds of things that we want to do on a host.

Running Evergreen Processes

A single configuration file drives most of how Evergreen works. Each Evergreen process must be supplied this settings file to run properly. For development, tweak the sample configuration file here.

All Evergreen programs accept a configuration file with the -conf flag.

How It Works

  • A MongoDB server must be already running on the port specified in the configuration file.
  • Both the API and UI server processes are started manually and listen for connections.
  • All other processes are run by the runner process.
  • For detailed instructions, please see the wiki.

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A Distributed Continuous Integration System from MongoDB

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