README

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runc

runc is a CLI tool for spawning and running containers according to the OCF specification.

State of the project

Currently runc is an implementation of the OCI specification. We are currently sprinting to have a v1 of the spec out. So the runc config format will be constantly changing until the spec is finalized. However, we encourage you to try out the tool and give feedback.

OCF

How does runc integrate with the Open Container Initiative Specification? runc depends on the types specified in the specs repository. Whenever the specification is updated and ready to be versioned runc will update its dependency on the specs repository and support the update spec.

Building:

At the time of writing, runc only builds on the Linux platform.

# create a 'github.com/opencontainers' in your GOPATH/src
cd github.com/opencontainers
git clone https://github.com/opencontainers/runc
cd runc
make
sudo make install

In order to enable seccomp support you will need to install libseccomp on your platform. If you do not want to build runc with seccomp support you can add BUILDTAGS="" when running make.

Build Tags

runc supports optional build tags for compiling in support for various features.

Build Tag Feature Dependency
seccomp Syscall filtering libseccomp
selinux selinux process and mount labeling
apparmor apparmor profile support libapparmor

Testing:

You can run tests for runC by using command:

# make test

Note that test cases are run in Docker container, so you need to install docker first. And test requires mounting cgroups inside container, it's done by docker now, so you need a docker version newer than 1.8.0-rc2.

You can also run specific test cases by:

# make test TESTFLAGS="-run=SomeTestFunction"

Using:

To run a container with the id "test", execute runc start with the containers id as arg one in the bundle's root directory:

runc start test
/ $ ps
PID   USER     COMMAND
1     daemon   sh
5     daemon   sh
/ $

OCI Container JSON Format:

OCI container JSON format is based on OCI specs. You can generate JSON files by using runc spec. It assumes that the file-system is found in a directory called rootfs and there is a user with uid and gid of 0 defined within that file-system.

Examples:

Using a Docker image (requires version 1.3 or later)

To test using Docker's busybox image follow these steps:

  • Install docker and download the busybox image: docker pull busybox
  • Create a container from that image and export its contents to a tar file: docker export $(docker create busybox) > busybox.tar
  • Untar the contents to create your filesystem directory:
mkdir rootfs
tar -C rootfs -xf busybox.tar
  • Create config.json by using runc spec.
  • Execute runc start and you should be placed into a shell where you can run ps:
$ runc start test
/ # ps
PID   USER     COMMAND
    1 root     sh
    9 root     ps
Using runc with systemd

To use runc with systemd, you can create a unit file /usr/lib/systemd/system/minecraft.service as below (edit your own Description or WorkingDirectory or service name as you need).

[Unit]
Description=Minecraft Build Server
Documentation=http://minecraft.net
After=network.target

[Service]
CPUQuota=200%
MemoryLimit=1536M
ExecStart=/usr/local/bin/runc start minecraft
Restart=on-failure
WorkingDirectory=/containers/minecraftbuild

[Install]
WantedBy=multi-user.target

Make sure you have the bundle's root directory and JSON configs in your WorkingDirectory, then use systemd commands to start the service:

systemctl daemon-reload
systemctl start minecraft.service

Note that if you use JSON configs by runc spec, you need to modify config.json and change process.terminal to false so runc won't create tty, because we can't set terminal from the stdin when using systemd service.

Documentation

The Go Gopher

There is no documentation for this package.

Directories

Path Synopsis
Godeps
_workspace/src/github.com/codegangsta/cli
Package cli provides a minimal framework for creating and organizing command line Go applications.
Package cli provides a minimal framework for creating and organizing command line Go applications.
_workspace/src/github.com/coreos/go-systemd/activation
Package activation implements primitives for systemd socket activation.
Package activation implements primitives for systemd socket activation.
_workspace/src/github.com/coreos/go-systemd/dbus
Integration with the systemd D-Bus API.
Integration with the systemd D-Bus API.
_workspace/src/github.com/coreos/go-systemd/util
Package util contains utility functions related to systemd that applications can use to check things like whether systemd is running.
Package util contains utility functions related to systemd that applications can use to check things like whether systemd is running.
_workspace/src/github.com/docker/go-units
Package units provides helper function to parse and print size and time units in human-readable format.
Package units provides helper function to parse and print size and time units in human-readable format.
_workspace/src/github.com/godbus/dbus
Package dbus implements bindings to the D-Bus message bus system.
Package dbus implements bindings to the D-Bus message bus system.
_workspace/src/github.com/godbus/dbus/introspect
Package introspect provides some utilities for dealing with the DBus introspection format.
Package introspect provides some utilities for dealing with the DBus introspection format.
_workspace/src/github.com/godbus/dbus/prop
Package prop provides the Properties struct which can be used to implement org.freedesktop.DBus.Properties.
Package prop provides the Properties struct which can be used to implement org.freedesktop.DBus.Properties.
_workspace/src/github.com/golang/protobuf/proto
Package proto converts data structures to and from the wire format of protocol buffers.
Package proto converts data structures to and from the wire format of protocol buffers.
_workspace/src/github.com/seccomp/libseccomp-golang
Package seccomp rovides bindings for libseccomp, a library wrapping the Linux seccomp syscall.
Package seccomp rovides bindings for libseccomp, a library wrapping the Linux seccomp syscall.
_workspace/src/github.com/syndtr/gocapability/capability
Package capability provides utilities for manipulating POSIX capabilities.
Package capability provides utilities for manipulating POSIX capabilities.
_workspace/src/github.com/vishvananda/netlink
Package netlink provides a simple library for netlink.
Package netlink provides a simple library for netlink.
_workspace/src/github.com/vishvananda/netlink/nl
Package nl has low level primitives for making Netlink calls.
Package nl has low level primitives for making Netlink calls.
Libcontainer provides a native Go implementation for creating containers with namespaces, cgroups, capabilities, and filesystem access controls.
Libcontainer provides a native Go implementation for creating containers with namespaces, cgroups, capabilities, and filesystem access controls.
criurpc
Package criurpc is a generated protocol buffer package.
Package criurpc is a generated protocol buffer package.
integration
integration is used for integration testing of libcontainer
integration is used for integration testing of libcontainer
specconv
Package specconv implements conversion of specifications to libcontainer configurations
Package specconv implements conversion of specifications to libcontainer configurations