opencontainers/runc

Name: runc

Owner: Open Container Initiative

Description: CLI tool for spawning and running containers according to the OCI specification

Created: 2015-06-05 23:30:45.0

Updated: 2018-01-19 05:12:40.0

Pushed: 2018-01-17 08:40:51.0

Homepage: https://www.opencontainers.org/

Size: 6179

Language: Go

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README

runc

Introduction

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

Releases

runc depends on and tracks the runtime-spec repository. We will try to make sure that runc and the OCI specification major versions stay in lockstep. This means that runc 1.0.0 should implement the 1.0 version of the specification.

You can find official releases of runc on the release page.

Security

If you wish to report a security issue, please disclose the issue responsibly to security@opencontainers.org.

Building

runc currently supports the Linux platform with various architecture support. It must be built with Go version 1.6 or higher in order for some features to function properly.

In order to enable seccomp support you will need to install libseccomp on your platform.

e.g. libseccomp-devel for CentOS, or libseccomp-dev for Ubuntu

Otherwise, if you do not want to build runc with seccomp support you can add BUILDTAGS="" when running make.

eate a 'github.com/opencontainers' in your GOPATH/src
ithub.com/opencontainers
clone https://github.com/opencontainers/runc
unc


 make install

runc will be installed to /usr/local/sbin/runc on your system.

Build Tags

runc supports optional build tags for compiling support of various features. To add build tags to the make option the BUILDTAGS variable must be set.

 BUILDTAGS='seccomp apparmor'

| Build Tag | Feature | Dependency | |———–|————————————|————-| | seccomp | Syscall filtering | libseccomp | | selinux | selinux process and mount labeling | | | apparmor | apparmor profile support | | | ambient | ambient capability support | kernel 4.3 |

Running the test suite

runc currently supports running its test suite via Docker. To run the suite just type make test.

 test

There are additional make targets for running the tests outside of a container but this is not recommended as the tests are written with the expectation that they can write and remove anywhere.

You can run a specific test case by setting the TESTFLAGS variable.

ke test TESTFLAGS="-run=SomeTestFunction"

Dependencies Management

runc uses vndr for dependencies management. Please refer to vndr for how to add or update new dependencies.

Using runc

Creating an OCI Bundle

In order to use runc you must have your container in the format of an OCI bundle. If you have Docker installed you can use its export method to acquire a root filesystem from an existing Docker container.

eate the top most bundle directory
r /mycontainer
mycontainer

eate the rootfs directory
r rootfs

port busybox via Docker into the rootfs directory
er export $(docker create busybox) | tar -C rootfs -xvf -

After a root filesystem is populated you just generate a spec in the format of a config.json file inside your bundle. runc provides a spec command to generate a base template spec that you are then able to edit. To find features and documentation for fields in the spec please refer to the specs repository.

 spec

Running Containers

Assuming you have an OCI bundle from the previous step you can execute the container in two different ways.

The first way is to use the convenience command run that will handle creating, starting, and deleting the container after it exits.

n as root
mycontainer
 run mycontainerid

If you used the unmodified runc spec template this should give you a sh session inside the container.

The second way to start a container is using the specs lifecycle operations. This gives you more power over how the container is created and managed while it is running. This will also launch the container in the background so you will have to edit the config.json to remove the terminal setting for the simple examples here. Your process field in the config.json should look like this below with "terminal": false and "args": ["sleep", "5"].

    "process": {
            "terminal": false,
            "user": {
                    "uid": 0,
                    "gid": 0
            },
            "args": [
                    "sleep", "5"
            ],
            "env": [
                    "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                    "TERM=xterm"
            ],
            "cwd": "/",
            "capabilities": {
                    "bounding": [
                            "CAP_AUDIT_WRITE",
                            "CAP_KILL",
                            "CAP_NET_BIND_SERVICE"
                    ],
                    "effective": [
                            "CAP_AUDIT_WRITE",
                            "CAP_KILL",
                            "CAP_NET_BIND_SERVICE"
                    ],
                    "inheritable": [
                            "CAP_AUDIT_WRITE",
                            "CAP_KILL",
                            "CAP_NET_BIND_SERVICE"
                    ],
                    "permitted": [
                            "CAP_AUDIT_WRITE",
                            "CAP_KILL",
                            "CAP_NET_BIND_SERVICE"
                    ],
                    "ambient": [
                            "CAP_AUDIT_WRITE",
                            "CAP_KILL",
                            "CAP_NET_BIND_SERVICE"
                    ]
            },
            "rlimits": [
                    {
                            "type": "RLIMIT_NOFILE",
                            "hard": 1024,
                            "soft": 1024
                    }
            ],
            "noNewPrivileges": true
    },

Now we can go through the lifecycle operations in your shell.

n as root
mycontainer
 create mycontainerid

ew the container is created and in the "created" state
 list

art the process inside the container
 start mycontainerid

ter 5 seconds view that the container has exited and is now in the stopped state
 list

w delete the container
 delete mycontainerid

This adds more complexity but allows higher level systems to manage runc and provides points in the containers creation to setup various settings after the container has created and/or before it is deleted. This is commonly used to setup the container's network stack after create but before start where the user's defined process will be running.

Rootless containers

runc has the ability to run containers without root privileges. This is called rootless. You need to pass some parameters to runc in order to run rootless containers. See below and compare with the previous version. Run the following commands as an ordinary user:

me as the first example
r ~/mycontainer
/mycontainer
r rootfs
er export $(docker create busybox) | tar -C rootfs -xvf -

e --rootless parameter instructs runc spec to generate a configuration for a rootless container, which will allow you to run the container as a non-root user.
 spec --rootless

e --root parameter tells runc where to store the container state. It must be writable by the user.
 --root /tmp/runc run mycontainerid

Supervisors

runc can be used with process supervisors and init systems to ensure that containers are restarted when they exit. An example systemd unit file looks something like this.

t]
ription=Start My Container

vice]
=forking
Start=/usr/local/sbin/runc run -d --pid-file /run/mycontainerid.pid mycontainerid
StopPost=/usr/local/sbin/runc delete mycontainerid
ingDirectory=/mycontainer
ile=/run/mycontainerid.pid

tall]
edBy=multi-user.target