railcar - rust implementation of the oci-runtime spec
railcar is a rust implementation of the opencontainers
spec. It is similar to the
runc, but it is implemented completely in rust for
memory safety without needing the overhead of a garbage collector or multiple
threads. For more information on the development of railcar, check out
Building a Container Runtime in
curl https://sh.rustup.rs -sSf | sh
cargo install cargo-when
rustup toolchain install stable-x86_64-unknown-linux-gnu
rustup default stable-x86_64-unknown-linux-gnu # for stable
rustup target install x86_64-unknown-linux-musl # for stable
rustup toolchain install nightly-x86_64-unknown-linux-gnu
rustup default nightly-x86_64-unknown-linux-gnu # for nightly
rustup target install x86_64-unknown-linux-musl # for nightly
Building can be done via build.sh:
By default, build.sh builds a dynamic binary using gnu. To build a static
Build requirements for TARGET=x86_64-unknown-linux-gnu:
Build requirements for TARGET=x86_64-unknown-linux-musl:
git submodule update --init
To build a release version:
If you build using stable instead of nightly, the set_name feature will be disabled and the init process inside the container will not be named rc-init when viewed via ps or /proc/$pid/cmdline.
You can specify a different bundle directory where your config.json is located with -b:
./railcar -b /some/other/directory run
railcar with docker
railcar can be used as a backend for docker. To use it, start the docker
daemon with an additional backend:
dockerd ... --experimental --add-runtime "rc=/path/to/railcar"
Then you can use
railcar by specifying the
docker run -it --rm --runtime rc hello
Note that you should start the daemon with a terminal (the -t option) so that
docker can properly collect stdout and stderr from
railcar. If you want to
daemonize the container, just use:
docker run -dt --rm --runtime rc hello
railcar is very similar to
runc, but some of the
commands are not supported. Currently,
railcar does not support the following
railcar always runs an init process separately from the container
railcar is an open source project. See CONTRIBUTING for
Oracle gratefully acknowledges the contributions to railcar that have been made by the community.
The best way to get in touch is Slack.
Then join the Railcar channel.
Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
railcar is dual licensed under the Universal Permissive License 1.0 and the
Apache License 2.0.
See LICENSE for more details.