railcar - rust implementation of the oci-runtime spec
railcar is a rust implementation of the opencontainers initiative's runtime spec. It is similar to the reference implementation
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 Rust
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 binary, set
Build requirements for TARGET=x86_64-unknown-linux-gnu:
Build requirements for TARGET=x86_64-unknown-linux-musl:
git submodule update --init autotools make gcc musl-gcc
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
runc commands are not supported. Currently,
railcar does not support the following commands:
checkpoint events exec init list pause restore resume spec
railcar always runs an init process separately from the container process.
railcar is an open source project. See CONTRIBUTING for details.
Oracle gratefully acknowledges the contributions to railcar that have been made by the community.
Getting in touch
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.