# cri-containerd
<p align="center">
<img src="https://github.com/kubernetes/kubernetes/blob/master/logo/logo.png" width="50" height="50">
<img src="https://github.com/containerd/containerd/blob/master/docs/images/containerd-dark.png" width="200" >
</p>

[![Build Status](https://api.travis-ci.org/containerd/cri-containerd.svg?style=flat-square)](https://travis-ci.org/containerd/cri-containerd)
[![Go Report Card](https://goreportcard.com/badge/github.com/containerd/cri-containerd?style=flat-square)](https://goreportcard.com/report/github.com/containerd/cri-containerd)

`cri-containerd` is a [containerd](https://containerd.io/) based implementation of Kubernetes [container runtime interface (CRI)](https://github.com/kubernetes/kubernetes/blob/master/pkg/kubelet/apis/cri/runtime/v1alpha2/api.proto).

With it, you could run Kubernetes using containerd as the container runtime.
![cri-containerd](./docs/cri-containerd.png)
## Current Status
`cri-containerd` is in beta:
* It is feature complete.
* It (the beta version) works with Kubernetes >= 1.9.
* It has passed all [CRI validation tests](https://github.com/kubernetes/community/blob/master/contributors/devel/cri-validation.md).
* It has passed all regular [node e2e tests](https://github.com/kubernetes/community/blob/master/contributors/devel/e2e-node-tests.md).
* It has passed all regular [e2e tests](https://github.com/kubernetes/community/blob/master/contributors/devel/e2e-tests.md).

See [test dashboard](https://k8s-testgrid.appspot.com/sig-node-containerd)
## Support Metrics
| CRI-Containerd Version | Kubernetes Version |
|:----------------------:|:------------------:|
|     v1.0.0-alpha.x     |      1.7, 1.8      |
|      v1.0.0-beta.x     |        1.9         |
|          HEAD          |        1.10+       |
## Production Quality Cluster on GCE
For a production quality cluster on GCE brought up with `kube-up.sh` refer [here](docs/kube-up.md).
## Installing with Ansible and Kubeadm
For a multi node cluster installer and bring up steps using ansible and kubeadm refer [here](contrib/ansible/README.md).
## Custom Installation
For non ansible users, you can download the `cri-containerd` release tarball and deploy
kubernetes cluster using kubeadm as described [here](docs/installation.md).
## Getting Started for Developers
### Binary Dependencies and Specifications
The current release of `cri-containerd` has the following dependencies:
* [containerd](https://github.com/containerd/containerd)
* [runc](https://github.com/opencontainers/runc)
* [CNI](https://github.com/containernetworking/cni)

See [versions](./vendor.conf) 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](https://github.com/opencontainers/image-spec)
and [runtime](https://github.com/opencontainers/runtime-spec) 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 `libseccomp-dev` is required. See [travis.yml](.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)
2. Install other dependencies:
* **`nsenter`**: Required by CNI and portforward.
* **`socat`**: Required by portforward.
3. Install and setup a go 1.10 development environment.
4. Make a local clone of this repository.
5. Install binary dependencies by running the following command from your cloned `cri-containerd/` project directory:
```bash
# 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:
```bash
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.

```bash
make BUILD_TAGS='seccomp apparmor'
```

| Build Tag | Feature                            | Dependency                      |
|-----------|------------------------------------|---------------------------------|
| seccomp   | syscall filtering                  | libseccomp development library  |
| selinux   | selinux process and mount labeling | <none>                          |
| apparmor  | apparmor profile support           | libapparmor development library |
### Validate Your cri-containerd Setup
A Kubernetes incubator project called [cri-tools](https://github.com/kubernetes-incubator/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](https://github.com/kubernetes/community/blob/master/contributors/devel/cri-validation.md).

Run the CRI Validation test to validate your installation of `cri-containerd`:
```bash
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:
```bash
sudo containerd
```
2. Start `cri-containerd` as root in a second terminal:
```bash
sudo cri-containerd
```
3. From the Kubernetes project directory startup a local cluster using `cri-containerd`:
```bash
CONTAINER_RUNTIME=remote CONTAINER_RUNTIME_ENDPOINT='/var/run/cri-containerd.sock' ./hack/local-up-cluster.sh
```
### Test
See [here](./docs/testing.md) for information about test.
## Using crictl
See [here](./docs/crictl.md) for information about using `crictl` to debug
pods, containers, and images.
## Documentation
See [here](./docs) for additional documentation.
## Contributing
Interested in contributing? Check out the [documentation](./CONTRIBUTING.md).

## Communication
This project was originally established in April of 2017 in the Kubernetes
Incubator program. After reaching the Beta stage, In January of 2018, the
project was merged into [containerd](https://github.com/containerd/containerd).

For async communication and long running discussions please use issues and pull
requests on this github repo. This will be the best place to discuss design and
implementation.

For sync communication we have a community slack with a #containerd channel that
everyone is welcome to join and chat about development.

**Slack:** https://dockr.ly/community

## Other Communications
As this project is tightly coupled to CRI and CRI-Tools and they are Kubernetes
projects, some of our project communications take place in the Kubernetes' SIG:
`sig-node.`

For more information about `sig-node`, `CRI`, and the `CRI-Tools` projects:
* [sig-node community site](https://github.com/kubernetes/community/tree/master/sig-node)
* Slack: `#sig-node` channel in Kubernetes (kubernetes.slack.com)
* Mailing List: https://groups.google.com/forum/#!forum/kubernetes-sig-node

### Reporting Security Issues

__If you are reporting a security issue, please reach out discreetly at security@containerd.io__.

## Licenses
The containerd codebase is released under the [Apache 2.0 license](https://github.com/containerd/containerd/blob/master/LICENSE.code).
The README.md file, and files in the "docs" folder are licensed under the
Creative Commons Attribution 4.0 International License under the terms and
conditions set forth in the file "[LICENSE.docs](https://github.com/containerd/containerd/blob/master/LICENSE.docs)". You may obtain a duplicate
copy of the same license, titled CC-BY-4.0, at http://creativecommons.org/licenses/by/4.0/.

## Code of Conduct
This project follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).
