+ runc now supports v1.0.0 of the OCI runtime specification. #1527
+ Rootless containers support has been released. The current state of
  this feature is that it only supports single-{uid,gid} mappings as an
  unprivileged user, and cgroups are completely unsupported. Work is
  being done to improve this. #774
+ Rather than relying on CRIU version nnumbers, actually check if the
  system supports pre-dumping. #1371
+ Allow the PIDs cgroup limit to be updated. #1423
+ Add support for checkpoint/restore of containers with orphaned PTYs
  (which is effectively all containers with terminal=true). #1355
+ Permit prestart hooks to modify the cgroup configuration of a
  container. #1239
+ Add support for a wide variety of mount options. #1460
+ Expose memory.use_hierarchy in MemoryStats. #1378


* Fix incorrect handling of systems without the freezer cgroup. #1387
* Many, many changes to switch away from Go's "syscall" stdlib to
  "golang.org/x/sys/unix". #1394 #1398 #1442 #1464 #1467 #1470 #1474
  #1478 #1491 #1482 #1504 #1519 #1530
* Set cgroup resources when restoring a container. #1399
* Switch back to using /sbin as the installation directory. #1406
* Remove the arbitrary container ID length restriction. #1435
* Make container force deletion ignore non-existent containers. #1451
* Improve handling of arbitrary cgroup mount locations when populating
  cpuset. #1372
* Make the SaneTerminal interface public. #1479
* Fix cases where runc would report a container to be in a "Running"
  state if the init was a zombie or dead. #1489
* Do not set supplementary groups for numeric users. #1450
* Fix various issues with the "owner" field in runc-list. #1516
* Many other miscellaneous fixes, some of which were made by first-time
  contributors. Thanks, and welcome to the project! #1406 #1400 #1365
  #1396 #1402 #1414 #1412 #1408 #1418 #1425 #1428 #1436 #1433 #1438
  #1410 #1447 #1388 #1484 #1481 #1496 #1245 #1524 #1534 #1526 #1533


- Remove any semblance of non-Linux support. #1502
- We no longer use shfmt for testing. #1510

Thanks to all of the contributors that made this release possible:

* Adrian Reber <areber@redhat.com>
* Aleksa Sarai <asarai@suse.de>
* Andrei Vagin <avagin@virtuozzo.com>
* Antonio Murdaca <runcom@redhat.com>
* chchliang <chen.chuanliang@zte.com.cn>
* Christy Perez <christy@linux.vnet.ibm.com>
* Craig Furman <cfurman@pivotal.io>
* CuiHaozhi <cuihz@wise2c.com>
* Daniel, Dao Quang Minh <dqminh89@gmail.com>
* Derek Carr <decarr@redhat.com>
* Harshal Patil <harshal.patil@in.ibm.com>
* Jonh Wendell <jonh.wendell@redhat.com>
* Justin Cormack <justin.cormack@docker.com>
* Kang Liang <kangliang424@gmail.com>
* Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
* Konstantinos Karampogias <konstantinos.karampogias@swisscom.com>
* Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>
* Michael Crosby <crosbymichael@gmail.com>
* Mrunal Patel <mrunalp@gmail.com>
* Qiang Huang <h.huangqiang@huawei.com>
* Steven Hartland <steven.hartland@multiplay.co.uk>
* Tim Potter <tpot@hpe.com>
* Tobias Klauser <tklauser@distanz.ch>
* Valentin Rothberg <vrothberg@suse.com>
* Vincent Batts <vbatts@redhat.com>
* Wentao Zhang <zhangwentao234@huawei.com>
* Will Martin <wmartin@pivotal.io>
* W. Trevor King <wking@tremily.us>
* yangshukui <yangshukui@huawei.com>
* Zhang Wei <zhangwei555@huawei.com>

Vote-Closed: [Wed Aug 9 05:28:38 UTC 2017]
Vote-Results: [+5 -0 /2]
VERSION: release v1.0.0-rc4

Signed-off-by: Aleksa Sarai <asarai@suse.de>
1 file changed
tree: cd4778cd1fbd39a85b0a5643232803a276da2a5c
  1. contrib/
  2. libcontainer/
  3. man/
  4. script/
  5. tests/
  6. vendor/
  7. .gitignore
  8. .pullapprove.yml
  9. .travis.yml
  10. checkpoint.go
  12. create.go
  13. delete.go
  14. Dockerfile
  15. events.go
  16. exec.go
  17. init.go
  18. kill.go
  20. list.go
  21. main.go
  24. Makefile
  25. NOTICE
  26. notify_socket.go
  27. pause.go
  29. ps.go
  30. README.md
  31. restore.go
  32. rlimit_linux.go
  33. run.go
  34. signals.go
  35. spec.go
  36. start.go
  37. state.go
  38. tty.go
  39. update.go
  40. utils.go
  41. utils_linux.go
  42. vendor.conf


Build Status Go Report Card GoDoc


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


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.


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


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.

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

sudo 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.

make BUILDTAGS='seccomp apparmor'
Build TagFeatureDependency
seccompSyscall filteringlibseccomp
selinuxselinux process and mount labeling
apparmorapparmor profile supportlibapparmor
ambientambient capability supportkernel 4.3

Running the test suite

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

make 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.

# make 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.

# create the top most bundle directory
mkdir /mycontainer
cd /mycontainer

# create the rootfs directory
mkdir rootfs

# export busybox via Docker into the rootfs directory
docker 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.

runc 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.

# run as root
cd /mycontainer
runc 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": [
                "cwd": "/",
                "capabilities": {
                        "bounding": [
                        "effective": [
                        "inheritable": [
                        "permitted": [
                        "ambient": [
                "rlimits": [
                                "type": "RLIMIT_NOFILE",
                                "hard": 1024,
                                "soft": 1024
                "noNewPrivileges": true

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

# run as root
cd /mycontainer
runc create mycontainerid

# view the container is created and in the "created" state
runc list

# start the process inside the container
runc start mycontainerid

# after 5 seconds view that the container has exited and is now in the stopped state
runc list

# now delete the container
runc 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:

# Same as the first example
mkdir ~/mycontainer
cd ~/mycontainer
mkdir rootfs
docker export $(docker create busybox) | tar -C rootfs -xvf -

# The --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.
runc spec --rootless

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


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.

Description=Start My Container

ExecStart=/usr/local/sbin/runc run -d --pid-file /run/mycontainerid.pid mycontainerid
ExecStopPost=/usr/local/sbin/runc delete mycontainerid