cri

README

cri-containerd

cri-containerd is a containerd based implementation of Kubernetes container runtime interface (CRI).

With it, you could run Kubernetes using containerd as the container runtime.

Current Status

cri-containerd is in alpha:

• It is feature complete.
• It works with Kubernetes >= 1.7.
• It has passed all CRI validation tests.
• It has passed all regular node e2e tests.

Installing with Ansible and Kubeadm

For a multi node cluster installer and bring up steps using ansible and kubeadm refer here.

Custom Installation

For non ansible users, you can download the cri-containerd release tarball and deploy kubernetes cluster using kubeadm as described here.

Getting Started for Developers

Binary Dependencies and Specifications

The current release of cri-containerd has the following dependencies:

• containerd
• runc
• CNI

See versions of these dependencies cri-containerd is tested with.

As containerd and runc move to their respective general availability releases, we will do our best to rebase/retest cri-containerd with these releases on a weekly/monthly basis. Similarly, given that cri-containerd uses the Open Container Initiative (OCI) image and runtime specifications, we will also do our best to update cri-containerd to the latest releases of these specifications as appropriate.

Install Dependencies

1. Install development libraries:

• libseccomp development library. Required by cri-containerd and runc seccomp support. libseccomp-dev (Ubuntu, Debian) / libseccomp-devel (Fedora, CentOS, RHEL). On releases of Ubuntu <=Trusty and Debian <=jessie a backport version of libsecomp-dev is required. See travis.yml for an example on trusty.
• libapparmor development library. Required by cri-containerd and runc apparmor support. To use apparmor on Debian, Ubuntu, and related distributions the installation of libapparmor-dev is required.
• btrfs development library. Required by containerd btrfs support. btrfs-tools(Ubuntu, Debian) / btrfs-progs-devel(Fedora, CentOS, RHEL)

1. Install other dependencies:

• nsenter: Required by CNI and portforward.
• socat: Required by portforward.

1. Install and setup a go 1.8.x development environment.
2. Make a local clone of this repository.
3. Install binary dependencies by running the following command from your cloned cri-containerd/ project directory:

# Note: install.deps installs the above mentioned runc, containerd, and CNI
# binary dependencies. install.deps is only provided for general use and ease of
# testing. To customize `runc` and `containerd` build tags and/or to configure
# `cni`, please follow instructions in their documents.
make install.deps

Build and Install cri-containerd

To build and install cri-containerd enter the following commands from your cri-containerd project directory:

make
sudo make install

Build Tags

cri-containerd supports optional build tags for compiling support of various features. To add build tags to the make option the BUILDTAGS variable must be set.

make BUILD_TAGS='seccomp apparmor'

Build Tag	Feature	Dependency
seccomp	syscall filtering	libseccomp development library
selinux	selinux process and mount labeling
apparmor	apparmor profile support	libapparmor development library

Validate Your cri-containerd Setup

Another Kubernetes incubator project called cri-tools includes programs for exercising CRI implementations such as cri-containerd. More importantly, cri-tools includes the program critest which is used for running CRI Validation Testing.

Run the CRI Validation test to validate your installation of cri-containerd:

make test-cri

Running a Kubernetes local cluster

If you already have a working development environment for supported Kubernetes version, you can try cri-containerd in a local cluster:

1. Start containerd as root in a first terminal:

sudo containerd

1. Start cri-containerd as root in a second terminal:

sudo cri-containerd -v 2 --alsologtostderr

1. From the Kubernetes project directory startup a local cluster using cri-containerd:

CONTAINER_RUNTIME=remote CONTAINER_RUNTIME_ENDPOINT='/var/run/cri-containerd.sock' ./hack/local-up-cluster.sh

Test

See here for information about test.

Documentation

See here for additional documentation.

Contributing

Interested in contributing? Check out the documentation.

Kubernetes Incubator

This is a Kubernetes Incubator project. The project was established 2017/4/13. The incubator team for the project is:

• Sponsor: Dawn Chen (@dchen1107)
• Champion: Yuju Hong (@yujuhong)
• SIG: sig-node

For more information about sig-node and the cri-containerd project:

• sig-node community site
• Slack: #sig-node channel in Kubernetes (kubernetes.slack.com)
• Mailing List: https://groups.google.com/forum/#!forum/kubernetes-sig-node

Code of Conduct

Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.