680f7a6106
Push an image to a specified location, such as to an atomic registry or a local directory Signed-off-by: Ryan Cole <rcyoalne@gmail.com>
211 lines
8.1 KiB
Markdown
211 lines
8.1 KiB
Markdown
|
|
# cri-o - OCI-based implementation of Kubernetes Container Runtime Interface
|
|
|
|
[](https://travis-ci.org/kubernetes-incubator/cri-o)
|
|
[](https://goreportcard.com/report/github.com/kubernetes-incubator/cri-o)
|
|
|
|
### Status: alpha
|
|
|
|
## What is the scope of this project?
|
|
|
|
cri-o is meant to provide an integration path between OCI conformant runtimes and the kubelet.
|
|
Specifically, it implements the Kubelet Container Runtime Interface (CRI) using OCI conformant runtimes.
|
|
The scope of cri-o is tied to the scope of the CRI.
|
|
|
|
At a high level, we expect the scope of cri-o to be restricted to the following functionalities:
|
|
|
|
* Support multiple image formats including the existing Docker image format
|
|
* Support for multiple means to download images including trust & image verification
|
|
* Container image management (managing image layers, overlay filesystems, etc)
|
|
* Container process lifecycle management
|
|
* Monitoring and logging required to satisfy the CRI
|
|
* Resource isolation as required by the CRI
|
|
|
|
## What is not in scope for this project?
|
|
|
|
* Building, signing and pushing images to various image storages
|
|
* A CLI utility for interacting with cri-o. Any CLIs built as part of this project are only meant for testing this project and there will be no guarantees on the backwards compatibility with it.
|
|
|
|
This is an implementation of the Kubernetes Container Runtime Interface (CRI) that will allow Kubernetes to directly launch and manage Open Container Initiative (OCI) containers.
|
|
|
|
The plan is to use OCI projects and best of breed libraries for different aspects:
|
|
- Runtime: [runc](https://github.com/opencontainers/runc) (or any OCI runtime-spec implementation) and [oci runtime tools](https://github.com/opencontainers/runtime-tools)
|
|
- Images: Image management using [containers/image](https://github.com/containers/image)
|
|
- Storage: Storage and management of image layers using [containers/storage](https://github.com/containers/storage)
|
|
- Networking: Networking support through use of [CNI](https://github.com/containernetworking/cni)
|
|
|
|
It is currently in active development in the Kubernetes community through the [design proposal](https://github.com/kubernetes/kubernetes/pull/26788). Questions and issues should be raised in the Kubernetes [sig-node Slack channel](https://kubernetes.slack.com/archives/sig-node).
|
|
|
|
## Commands
|
|
| Command | Description |
|
|
| ---------------------------------------------------- | ---------------------------------------------------------------------------------------------------- |
|
|
| [crio(8)](/docs/crio.8.md) | Enable OCI Kubernetes Container Runtime daemon |
|
|
| [kpod(1)](/docs/kpod.1.md) | Simple management tool for pods and images |
|
|
| [kpod-history(1)](/docs/kpod-history.1.md)] | Shows the history of an image |
|
|
| [kpod-images(1)](/docs/kpod-images.1.md) | List images in local storage |
|
|
| [kpod-pull(1)](/docs/kpod-pull.1.md) | Pull an image from a registry |
|
|
| [kpod-push(1)](/docs/kpod-push.1.md) | Push an image to a specified destination |
|
|
| [kpod-rmi(1)](/docs/kpod-rmi.1.md) | Removes one or more images |
|
|
| [kpod-tag(1)](/docs/kpod-tag.1.md) | Add an additional name to a local image |
|
|
| [kpod-version(1)](/docs/kpod-version.1.md) | Display the Kpod Version Information |
|
|
|
|
## Configuration
|
|
| File | Description |
|
|
| ---------------------------------------------------- | ---------------------------------------------------------------------------------------------------- |
|
|
| [crio.conf(5)](/docs/crio.conf.5.md) | CRI-O Configuation file |
|
|
|
|
## Communication
|
|
|
|
For async communication and long running discussions please use issues and pull requests on the github repo. This will be the best place to discuss design and implementation.
|
|
|
|
For sync communication we have an IRC channel #cri-o, on chat.freenode.net, that everyone is welcome to join and chat about development.
|
|
|
|
## Getting started
|
|
|
|
### Prerequisites
|
|
|
|
Latest verion of `runc` is expected to be installed on the system. It is picked up as the default runtime by crio.
|
|
|
|
### Build Dependencies
|
|
|
|
**Required**
|
|
|
|
Fedora, CentOS, RHEL, and related distributions:
|
|
|
|
```bash
|
|
yum install -y \
|
|
btrfs-progs-devel \
|
|
device-mapper-devel \
|
|
glib2-devel \
|
|
glibc-devel \
|
|
glibc-static \
|
|
gpgme-devel \
|
|
libassuan-devel \
|
|
libgpg-error-devel \
|
|
libseccomp-devel \
|
|
libselinux-devel \
|
|
pkgconfig \
|
|
runc
|
|
```
|
|
|
|
Debian, Ubuntu, and related distributions:
|
|
|
|
```bash
|
|
apt install -y \
|
|
btrfs-tools \
|
|
libassuan-dev \
|
|
libdevmapper-dev \
|
|
libglib2.0-dev \
|
|
libc6-dev \
|
|
libgpgme11-dev \
|
|
libgpg-error-dev \
|
|
libseccomp-dev \
|
|
libselinux1-dev \
|
|
pkg-config \
|
|
runc
|
|
```
|
|
|
|
If using an older release or a long-term support release, be careful to double-check that the version of `runc` is new enough, or else build your own.
|
|
|
|
**Optional**
|
|
|
|
Fedora, CentOS, RHEL, and related distributions:
|
|
|
|
(no optional packages)
|
|
|
|
Debian, Ubuntu, and related distributions:
|
|
|
|
```bash
|
|
apt install -y \
|
|
libapparmor-dev
|
|
```
|
|
|
|
### Get Source Code
|
|
|
|
As with other Go projects, cri-o must be cloned into a directory structure like:
|
|
|
|
```
|
|
GOPATH
|
|
└── src
|
|
└── github.com
|
|
└── kubernetes-incubator
|
|
└── cri-o
|
|
```
|
|
|
|
First, configure a `GOPATH` (if you are using go1.8 or later, this defaults to `~/go`).
|
|
|
|
```bash
|
|
export GOPATH=~/go
|
|
mkdir -p $GOPATH
|
|
```
|
|
|
|
Next, clone the source code using:
|
|
|
|
```bash
|
|
mkdir -p $GOPATH/src/github.com/kubernetes-incubator
|
|
cd $_ # or cd $GOPATH/src/github.com/kubernetes-incubator
|
|
git clone https://github.com/kubernetes-incubator/cri-o # or your fork
|
|
cd cri-o
|
|
```
|
|
|
|
### Build
|
|
|
|
```bash
|
|
make install.tools
|
|
make
|
|
sudo make install
|
|
```
|
|
|
|
Otherwise, if you do not want to build `cri-o` with seccomp support you can add `BUILDTAGS=""` when running make.
|
|
|
|
```bash
|
|
make BUILDTAGS=""
|
|
sudo make install
|
|
```
|
|
|
|
#### Build Tags
|
|
|
|
`cri-o` 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 BUILDTAGS='seccomp apparmor'
|
|
```
|
|
|
|
| Build Tag | Feature | Dependency |
|
|
|-----------|------------------------------------|-------------|
|
|
| seccomp | syscall filtering | libseccomp |
|
|
| selinux | selinux process and mount labeling | libselinux |
|
|
| apparmor | apparmor profile support | libapparmor |
|
|
|
|
### Running pods and containers
|
|
|
|
Follow this [tutorial](tutorial.md) to get started with CRI-O.
|
|
|
|
### Setup CNI networking
|
|
|
|
A proper description of setting up CNI networking is given in the
|
|
[`contrib/cni` README](contrib/cni/README.md). But the gist is that you need to
|
|
have some basic network configurations enabled and CNI plugins installed on
|
|
your system.
|
|
|
|
### Running with kubernetes
|
|
|
|
You can run a local version of kubernetes with cri-o using `local-up-cluster.sh`:
|
|
|
|
1. Clone the [kubernetes repository](https://github.com/kubernetes/kubernetes)
|
|
1. Start the cri-o daemon (`crio`)
|
|
1. From the kubernetes project directory, run: `CONTAINER_RUNTIME=remote CONTAINER_RUNTIME_ENDPOINT='/var/run/crio.sock --runtime-request-timeout=15m' ./hack/local-up-cluster.sh`
|
|
|
|
To run a full cluster, see [the instructions](kubernetes.md).
|
|
|
|
### Current Roadmap
|
|
|
|
1. Basic pod/container lifecycle, basic image pull (done)
|
|
1. Support for tty handling and state management (done)
|
|
1. Basic integration with kubelet once client side changes are ready (done)
|
|
1. Support for log management, networking integration using CNI, pluggable image/storage management (done)
|
|
1. Support for exec/attach (done)
|
|
1. Target fully automated kubernetes testing without failures [e2e status](https://github.com/kubernetes-incubator/cri-o/issues/533)
|
|
1. Release 1.0
|
|
1. Track upstream k8s releases
|