mirror of
https://github.com/kata-containers/kata-containers.git
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f34e2e6678
Current working directory is a process level resource. We cannot call chdir in parallel from multiple threads, which would cause cwd confusion and result in UT failures. The agent code itself is correct that chdir is only called from spawned child init process. Well, there is one exception that it is also called in do_create_container() but it is safe to assume that containers are never created in parallel (at least for now). Fixes: #782 Signed-off-by: Peng Tao <bergwolf@hyper.sh>
Kata Agent in Rust
This is a rust version of the kata-agent.
In Denver PTG, we discussed about re-writing agent in rust:
In general, we all think about re-write agent in rust to reduce the footprint of agent. Moreover, Eric mentioned the possibility to stop using gRPC, which may have some impact on footprint. We may begin to do some PoC to show how much we could save by re-writing agent in rust.
After that, we drafted the initial code here, and any contributions are welcome.
Features
| Feature | Status |
|---|---|
| OCI Behaviors | |
| create/start containers | ✅ |
| signal/wait process | ✅ |
| exec/list process | ✅ |
| I/O stream | ✅ |
| Cgroups | ✅ |
| Capabilities, rlimit, readonly path, masked path, users | ✅ |
container stats (stats_container) |
✅ |
| Hooks | ✅ |
| Agent Features & APIs | |
run agent as init (mount fs, udev, setup lo) |
✅ |
| block device as root device | ✅ |
| Health API | ✅ |
network, interface/routes (update_container) |
✅ |
File transfer API (copy_file) |
✅ |
Device APIs (reseed_random_device, , online_cpu_memory, mem_hotplug_probe, set_guet_data_time) |
✅ |
| vsock support | ✅ |
| virtio-serial support | ✖️ |
| OCI Spec validator | ✅ |
| Infrastructures | |
| Debug Console | ✅ |
| Command line | ✅ |
| Tracing | ✖️ |
Getting Started
Build from Source
The rust-agent need to be built with rust nightly, and static linked with musl.
rustup target add x86_64-unknown-linux-musl
git submodule update --init --recursive
sudo ln -s /usr/bin/g++ /bin/musl-g++
cargo build --target x86_64-unknown-linux-musl --release
Run Kata CI with rust-agent
- Firstly, install kata as noted by "how to install Kata"
- Secondly, build your own kata initrd/image following the steps in "how to build your own initrd/image". notes: Please use your rust agent instead of the go agent when building your initrd/image.
- Clone the kata ci test cases from: https://github.com/kata-containers/tests.git, and then run the cri test with:
$sudo -E PATH=$PATH -E GOPATH=$GOPATH integration/containerd/shimv2/shimv2-tests.sh
Mini Benchmark
The memory of 'RssAnon' consumed by the go-agent and rust-agent as below: go-agent: about 11M rust-agent: about 1.1M