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README.md

Garden-runC Release

A BOSH release for deploying Guardian.

Guardian is a simple single-host OCI container manager. It implements the Garden API which is used in Cloud Foundry.

Getting started

Clone it:

git clone https://github.com/cloudfoundry/garden-runc-release
cd garden-runc-release
git submodule update --init --recursive

Running

The easiest way to run Garden-runC is to deploy it with BOSH Lite, a VirtualBox development environment for BOSH. Once you have set up bosh-lite (follow the instructions in the bosh-lite docs), just deploy like any bosh release, e.g:

cd garden-runc-release # if you're not already there
./scripts/deploy-lite.sh

You can retrieve the address of the Garden-runC server by running bosh vms. It will be 10.244.0.2 if using the provided deploy-lite script. The server port defaults to 7777.

Usage

The easiest way to start creating containers is to use the gaol command line client.

e.g. gaol -t 10.244.0.2:7777 create -n my-container

For more advanced use cases, you'll need to use the Garden client package for Golang.

Operating garden-runc

Operator's guide.

Security Features

The following doc provides an overview of security features on Garden vs Docker vs Kubernetes.

Security overview.

Rootless containers

Garden has experimental support for running containers without requiring root privileges. Take a look at the rootless-containers.md doc for further info.

If you would like to enable rootless containers please read this document.

Contributing

In order to help us extend Garden-runC, we recommend opening a Github issue to describe the proposed features or changes. We also welcome pull requests.

You can use other distributions or OS X for development since a good chunk of the unit tests work across alternative platforms, and you can run platform specific tests in a VM using Concourse CI.

In order to contribute to the project you may want some of the following installed:

  • Git - Distributed version control system
  • Go - The Go programming language
  • Direnv - Environment management
  • Gosub - Gosub is a submodule based dependency manager for Go
  • Fly CLI - Concourse CLI
  • Virtualbox - Virtualization box
  • Vagrant - Portable dev environment

Garden-runC uses git submodules to maintain its dependencies and components. Some of Garden-runC's important components currently are:

  • Garden found under src/code.cloudfoundry.org/garden is the API server and client.
  • Guardian found under src/code.cloudfoundry.org/guardian is the Garden backend.
  • GrootFS found under src/code.cloudfoundry.org/grootfs downloads and manages root filesystems.
  • Garden Shed found under src/code.cloudfoundry.org/garden-shed is the legacy rootfs management piece, superseded by GrootFS.
  • GATS found under src/code.cloudfoundry.org/garden-integration-tests are the cross-backend integration tests of Garden.

Set your $GOPATH to the checked out directory, or use Direnv to do this, as below:

direnv allow

Running the tests

Concourse CI is used for running Garden-runC tests in a VM. It provides the Fly CLI for Linux and MacOSX. Instructions for deploying a single VM Concourse using BOSH can be found in the concourse-deployment repo

Once running, navigate to https://192.168.100.4:8080 in a web browser and download the Fly CLI using the links found in the bottom-right corner. Place the fly binary somewhere on your $PATH.

The tests use the Ginkgo BDD testing framework.

Assuming you have configured a Concourse and installed Ginkgo, you can run all the tests by executing FLY_TARGET=<your concourse target> ./scripts/test from the top level garden-runc-release directory.

Note: The concourse-lite VM may need to be provisioned with more RAM If you start to see tests failing with 'out of disk' errors.

Integration tests

The integration tests can be executed in Concourse CI by using Fly CLI and executing ./scripts/test. To run individual tests, use./scripts/remote-fly:

# Set your concourse target
export GARDEN_REMOTE_ATC_URL=<target>

# Running Guardian tests
./scripts/remote-fly ci/unit-tests/guardian.yml

# Running Garden tests
./scripts/remote-fly ci/unit-tests/garden.yml

# Running Garden Integration tests
./scripts/remote-fly ci/integration-tests/gdn-linux.yml

# Running Garden Integration Windows Regression tests (aka Gats98)
WINDOWS_TEST_ROOTFS=docker:///microsoft/nanoserver:1709 ./scripts/remote-fly ci/integration-tests/gdn-linux.yml

Running the tests locally

It is possible to run the integration tests locally on a Linux based OS like Ubuntu, but we don't recommend it due to the dependencies required, and the need for parts of the testing suite to run as a privileged user. If you'd like to run them locally, you will need at least:

  • A recent version of Go (1.8+)
  • Kernel version 4.4+
  • Running as a privileged user
  • AUFS
  • Overlayfs
  • xfs

The tests can be executed without Concourse CLI by running ginkgo -r command for any of the components:

# Running Garden unit tests
cd src/code.cloudfoundry.org/garden
ginkgo -r

# Running Guardian unit tests
cd src/code.cloudfoundry.org/guardian
ginkgo -r

It should be possible to run the unit tests on any system that satisfies golang build constraints.

Committing code

Write code in a submodule:

cd src/code.cloudfoundry.org/guardian # for example
git checkout master
git pull
# test, code, test..
git commit
git push

Commit the changes, run the tests, and create a bump commit:

# from the garden-runc directory
./scripts/test-and-bump # or just ./scripts/bump if you've already run the tests

Execute command in container using runc

  • Create a container with handle <handle>
  • Log in to the host OS with root privileges
  • Go to container depot directory
cd /var/vcap/data/garden/depot/<handle>
  • Execute process in container
/var/vcap/packages/runc/bin/runc exec <handle> <command>

Troubleshooting

The garden-ordnance-survey tool can be used to gather information useful for debugging issues on garden-runc-release deployments. Run this command on the deployment VM as root:

curl bit.ly/garden-ordnance-survey -sSfL | bash

License

Apache License 2.0