runc

command module
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Published: Aug 4, 2015 License: Apache-2.0 Imports: 22 Imported by: 0

README

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 OCF specification. We are currently sprinting to have a v1 of the spec out within a quick timeframe of a few weeks, ~July 2015, 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 Format? runc depends on the types specified in the specs repository. Whenever the specification is updated and ready to be versioned runc will update it's dependency on the specs repository and support the update spec.

Building:

# 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

Using:

To run a container that you received just execute runc with the JSON format as the argument or have a config.json file in the current working directory.

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

OCF Container JSON Format:

Below is a sample config.json configuration file. It assumes that the file-system is found in a directory called rootfs and there is a user named daemon defined within that file-system.

{
    "version": "pre-draft",
    "platform": {
        "os": "linux",
        "arch": "amd64"
    },
    "process": {
        "terminal": true,
        "user": {
            "uid": 0,
            "gid": 0,
            "additionalGids": null
        },
        "args": [
            "sh"
        ],
        "env": [
            "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
            "TERM=xterm"
        ],
        "cwd": ""
    },
    "root": {
        "path": "rootfs",
        "readonly": true
    },
    "hostname": "shell",
    "mounts": [
        {
            "type": "proc",
            "source": "proc",
            "destination": "/proc",
            "options": ""
        },
        {
            "type": "tmpfs",
            "source": "tmpfs",
            "destination": "/dev",
            "options": "nosuid,strictatime,mode=755,size=65536k"
        },
        {
            "type": "devpts",
            "source": "devpts",
            "destination": "/dev/pts",
            "options": "nosuid,noexec,newinstance,ptmxmode=0666,mode=0620,gid=5"
        },
        {
            "type": "tmpfs",
            "source": "shm",
            "destination": "/dev/shm",
            "options": "nosuid,noexec,nodev,mode=1777,size=65536k"
        },
        {
            "type": "mqueue",
            "source": "mqueue",
            "destination": "/dev/mqueue",
            "options": "nosuid,noexec,nodev"
        },
        {
            "type": "sysfs",
            "source": "sysfs",
            "destination": "/sys",
            "options": "nosuid,noexec,nodev"
        },
        {
            "type": "cgroup",
            "source": "cgroup",
            "destination": "/sys/fs/cgroup",
            "options": "nosuid,noexec,nodev,relatime,ro"
        }
    ],
    "linux": {
        "uidMapping": null,
        "gidMapping": null,
        "rlimits": null,
        "systemProperties": null,
        "resources": {
            "disableOOMKiller": false,
            "memory": {
                "limit": 0,
                "reservation": 0,
                "swap": 0,
                "kernel": 0,
                "swappiness": -1
            },
            "cpu": {
                "shares": 0,
                "quota": 0,
                "period": 0,
                "realtimeRuntime": 0,
                "realtimePeriod": 0,
                "cpus": "",
                "mems": ""
            },
            "blockIO": {
                "blkioWeight": 0,
                "blkioWeightDevice": "",
                "blkioThrottleReadBpsDevice": "",
                "blkioThrottleWriteBpsDevice": "",
                "blkioThrottleReadIopsDevice": "",
                "blkioThrottleWriteIopsDevice": ""
            },
            "hugepageLimits": null,
            "network": {
                "classId": "",
                "priorities": null
            }
        },
        "namespaces": [
            {
                "type": "process",
                "path": ""
            },
            {
                "type": "network",
                "path": ""
            },
            {
                "type": "ipc",
                "path": ""
            },
            {
                "type": "uts",
                "path": ""
            },
            {
                "type": "mount",
                "path": ""
            }
        ],
        "capabilities": [
            "AUDIT_WRITE",
            "KILL",
            "NET_BIND_SERVICE"
        ],
        "devices": [
            "null",
            "random",
            "full",
            "tty",
            "zero",
            "urandom"
        ]
    }
}

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 a file called config.json using the example from above. You can also generate a spec using runc spec, redirecting the output into config.json
  • Execute runc and you should be placed into a shell where you can run ps:
$ runc
/ # ps
PID   USER     COMMAND
    1 root     sh
    9 root     ps
Using runc with systemd
[Unit]
Description=Minecraft Build Server
Documentation=http://minecraft.net
After=network.target

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

[Install]
WantedBy=multi-user.target

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/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/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/syndtr/gocapability/capability
Package capability provides utilities for manipulating POSIX capabilities.
Package capability provides utilities for manipulating POSIX capabilities.
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.
integration
integration is used for integration testing of libcontainer
integration is used for integration testing of libcontainer
netlink
Packet netlink provide access to low level Netlink sockets and messages.
Packet netlink provide access to low level Netlink sockets and messages.
seccomp
Package seccomp provides native seccomp ( https://www.kernel.org/doc/Documentation/prctl/seccomp_filter.txt ) support for go.
Package seccomp provides native seccomp ( https://www.kernel.org/doc/Documentation/prctl/seccomp_filter.txt ) support for go.

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