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@ -2,17 +2,22 @@
[![Discord](https://img.shields.io/discord/849943000770412575.svg?logo=discord)](https://discord.gg/zHnyXKSQFD)
[![GitHub contributors](https://img.shields.io/github/contributors/containers/youki)](https://github.com/containers/youki/graphs/contributors)
[![Github CI](https://github.com/containers/youki/actions/workflows/main.yml/badge.svg?branch=main)](https://github.com/containers/youki/actions)
[![Github CI](https://github.com/containers/youki/actions/workflows/basic.yml/badge.svg?branch=main)](https://github.com/containers/youki/actions)
[![codecov](https://codecov.io/gh/containers/youki/branch/main/graph/badge.svg)](https://codecov.io/gh/containers/youki)
<p align="center">
<img src="docs/youki.png" width="450">
</p>
youki is an implementation of the [OCI runtime-spec](https://github.com/opencontainers/runtime-spec) in Rust, similar to [runc](https://github.com/opencontainers/runc).
**youki** is an implementation of the [OCI runtime-spec](https://github.com/opencontainers/runtime-spec) in Rust, similar to [runc](https://github.com/opencontainers/runc).
Your ideas are welcome [here](https://github.com/containers/youki/issues/10).
# Quick Start
# 🏷️ About the name
youki is pronounced as /joʊki/ or yoh-key.
youki is named after the Japanese word 'youki', which means 'a container'. In Japanese language, youki also means 'cheerful', 'merry', or 'hilarious'.
# 🚀 Quick Start
> [!TIP]
> You can immediately set up your environment with youki on GitHub Codespaces and try it out.
@ -26,22 +31,17 @@ Your ideas are welcome [here](https://github.com/containers/youki/issues/10).
[User Documentation](https://containers.github.io/youki/user/basic_setup.html#quick-install)
# About the name
youki is pronounced as /joʊki/ or yoh-key.
youki is named after the Japanese word 'youki', which means 'a container'. In Japanese language, youki also means 'cheerful', 'merry', or 'hilarious'.
# Motivation
# 🎯 Motivation
Here is why we are writing a new container runtime in Rust.
- Rust is one of the best languages to implement the oci-runtime spec. Many very nice container tools are currently written in Go. However, the container runtime requires the use of system calls, which requires a bit of special handling when implemented in Go. This tricky (e.g. _namespaces(7)_, _fork(2)_); with Rust too, but it's not that tricky. And, unlike in C, Rust provides the benefit of memory safety. While Rust is not yet a major player in the container field, it has the potential to contribute a lot: something this project attempts to exemplify.
- youki has the potential to be faster and use less memory than runc, and therefore work in environments with tight memory usage requirements. Here is a simple benchmark of a container from creation to deletion.
| Runtime | Time (mean ± σ) | Range (min … max) |
| :-----: | :-----------------: | :-----------------: |
| youki | 198.4 ms ± 52.1 ms | 97.2 ms … 296.1 ms |
| runc | 352.3 ms ± 53.3 ms | 248.3 ms … 772.2 ms |
| crun | 153.5 ms ± 21.6 ms | 80.9 ms … 196.6 ms |
| Runtime | Time (mean ± σ) | Range (min … max) | vs youki(mean) | Version |
| -------- | -------- | -------- | -------- | -------- |
| youki | 111.5 ms ± 11.6 ms | 84.0 ms ± 142.5 ms | 100% | 0.3.3 |
| runc | 224.6 ms ± 12.0 ms | 190.5 ms ± 255.4 ms | 200% | 1.1.7 |
| crun | 47.3 ms ± 2.8 ms | 42.4 ms ± 56.2 ms | 42% | 1.15 |
<details>
<summary>Details about the benchmark</summary>
@ -55,36 +55,16 @@ Here is why we are writing a new container runtime in Rust.
```console
$ ./youki info
Version 0.0.1
Kernel-Release 5.11.0-41-generic
Kernel-Version #45-Ubuntu SMP Fri Nov 5 11:37:01 UTC 2021
Version 0.3.3
Commit 4f3c8307
Kernel-Release 6.5.0-35-generic
Kernel-Version #35~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue May 7 09:00:52 UTC 2
Architecture x86_64
Operating System Ubuntu 21.04
Cores 12
Total Memory 32025
Cgroup setup hybrid
Operating System Ubuntu 22.04.4 LTS
Cores 16
Total Memory 63870
Cgroup setup unified
Cgroup mounts
blkio /sys/fs/cgroup/blkio
cpu /sys/fs/cgroup/cpu,cpuacct
cpuacct /sys/fs/cgroup/cpu,cpuacct
cpuset /sys/fs/cgroup/cpuset
devices /sys/fs/cgroup/devices
freezer /sys/fs/cgroup/freezer
hugetlb /sys/fs/cgroup/hugetlb
memory /sys/fs/cgroup/memory
net_cls /sys/fs/cgroup/net_cls,net_prio
net_prio /sys/fs/cgroup/net_cls,net_prio
perf_event /sys/fs/cgroup/perf_event
pids /sys/fs/cgroup/pids
unified /sys/fs/cgroup/unified
CGroup v2 controllers
cpu detached
cpuset detached
hugetlb detached
io detached
memory detached
pids detached
device attached
Namespaces enabled
mount enabled
uts enabled
@ -93,60 +73,34 @@ Here is why we are writing a new container runtime in Rust.
pid enabled
network enabled
cgroup enabled
$ ./youki --version
youki version 0.0.1
commit: 0.0.1-0-0be33bf
$ runc -v
runc version 1.0.0-rc93
commit: 12644e614e25b05da6fd08a38ffa0cfe1903fdec
spec: 1.0.2-dev
go: go1.13.15
libseccomp: 2.5.1
$ crun --version
crun version 0.19.1.45-4cc7
commit: 4cc7fa1124cce75dc26e12186d9cbeabded2b710
spec: 1.0.0
+SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
Capabilities
CAP_BPF available
CAP_PERFMON available
CAP_CHECKPOINT_RESTORE available
```
</details>
- I have fun implementing this. In fact, this may be the most important.
# Related project
# 📍 Status of youki
**youki** has aced real-world use cases, including containerd's e2e test, and is now adopted by several production environments.
We have [our roadmap](https://github.com/orgs/containers/projects/15).
![youki demo](docs/demo.gif)
# 🔗 Related project
- [containers/oci-spec-rs](https://github.com/containers/oci-spec-rs) - OCI Runtime and Image Spec in Rust
# Status of youki
youki is not at the practical stage yet. However, it is getting closer to practical use, running with docker and passing all the default tests provided by [opencontainers/runtime-tools](https://github.com/opencontainers/runtime-tools).
![youki demo](docs/demo.gif)
| Feature | Description | State |
|:---------------------:|:-----------------------------------------------:| :-------------------------------------------------------------------------------------------------: |
| Containerd | Running via Containerd | ✅ |
| Docker | Running via Docker | ✅ |
| Podman | Running via Podman | ✅ |
| pivot_root | Change the root directory | ✅ |
| Mounts | Mount files and directories to container | ✅ |
| Namespaces | Isolation of various resources | ✅ |
| Capabilities | Limiting root privileges | ✅ |
| Cgroups v1 | Resource limitations, etc | ✅ |
| Cgroups v2 | Improved version of v1 | Support is complete except for devices. WIP on [#230](https://github.com/containers/youki/issues/230) |
| Systemd cgroup driver | Setting up a cgroup using systemd | ✅ |
| Seccomp | Filtering system calls | ✅ |
| Hooks | Add custom processing during container creation | ✅ |
| Rootless | Running a container without root privileges | ✅ |
| OCI Compliance | Compliance with OCI Runtime Spec | ✅ 50 out of 50 test cases passing |
| CRIU Integration | Functionality to checkpoint/restore containers | Initial checkpoint support as described in [#641](https://github.com/containers/youki/pull/641) |
# Design and implementation of youki
# 🎨 Design and implementation of youki
The User and Developer Documentation for youki is hosted at [https://containers.github.io/youki/](https://containers.github.io/youki/)
![Architecture](docs/.drawio.svg)
# Getting Started
# 🎬 Getting Started
Local build is only supported on Linux.
For other platforms, please use the [Vagrantfile](#setting-up-vagrant) that we have prepared. You can also spin up a fully preconfigured development environment in the cloud with [GitHub Codespaces](https://docs.github.com/en/codespaces/getting-started/quickstart).
@ -322,15 +276,9 @@ cd youki
just youki-dev # or youki-release
```
# Community
# 👥 Community and Contibuting
We also have an active [Discord](https://discord.gg/h7R3HgWUct) if you'd like to come and chat with us.
# Contribution
This project welcomes your PR and issues.
For example, refactoring, adding features, correcting English, etc.
If you need any help, you can contact me on [Twitter](https://twitter.com/utam0k).
Please refer to [our community page](https://containers.github.io/youki/community/introduction.html).
Thanks to all the people who already contributed!