This release is *identical* to v1.0.0-rc10.

The purpose of this release is to resolve an issue with our versioning
scheme (in particular, the format we've used under SemVer means that the
"-rcNN" string suffix is sorted lexicographically rather than in the
classic `sort -V` order).

Because we cannot do a post-1.0 release yet, this is a workaround to
make sure that systems such as Go modules correctly update to the latest
runc release. See [1] for more details.

The next release (which would've originally been called -rc11) will be
1.0.0-rc91. I'm sorry.

[1]: https://github.com/opencontainers/runc/issues/2399

Signed-off-by: Aleksa Sarai <asarai@suse.de>

This is a hot-fix for v1.0.0~rc9, primarily fixing CVE-2019-19921. Given
that the relevant runtime-spec PR which was considered a blocker has
been merged[1] the next rc release of runc should be the last one before

Thanks to the following people who made this release possible:

 * Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
 * Aleksa Sarai <asarai@suse.de>
 * James Peach <jpeach@apache.org>
 * Jordan Liggitt <liggitt@google.com>
 * Julia Nedialkova <julianedialkova@hotmail.com>
 * Julio Montes <julio.montes@intel.com>
 * Kevin Kelani <kkelani@gmail.com>
 * Kurnia D Win <kurnia.d.win@gmail.com>
 * Manuel RĂ¼ger <manuel@rueg.eu>
 * Michael Crosby <crosbymichael@gmail.com>
 * Mrunal Patel <mrunal@me.com>
 * Qiang Huang <h.huangqiang@huawei.com>
 * Radostin Stoyanov <rstoyanov1@gmail.com>
 * Sascha Grunert <sgrunert@suse.com>
 * tianye15 <tianye15@yq01-ps-www007cc6e83.yq01.baidu.com>

[1]: https://github.com/opencontainers/runtime-spec/pull/1008

Vote: +4 -0 #1
Signed-off-by: Aleksa Sarai <asarai@suse.de>
VERSION: update to 1.0.0~rc10

Signed-off-by: Aleksa Sarai <asarai@suse.de>
1 file changed
tree: 4b678f050375f0f887a2f252dbe246615d5e15a1
  1. contrib/
  2. docs/
  3. libcontainer/
  4. man/
  5. script/
  6. tests/
  7. types/
  8. vendor/
  9. .gitignore
  10. .pullapprove.yml
  11. .travis.yml
  12. checkpoint.go
  14. create.go
  15. delete.go
  16. Dockerfile
  17. events.go
  18. exec.go
  19. init.go
  20. kill.go
  22. list.go
  23. main.go
  26. Makefile
  27. NOTICE
  28. notify_socket.go
  29. pause.go
  31. ps.go
  32. README.md
  33. restore.go
  34. rlimit_linux.go
  35. rootless_linux.go
  36. run.go
  37. SECURITY.md
  38. signalmap.go
  39. signalmap_mipsx.go
  40. signals.go
  41. spec.go
  42. start.go
  43. state.go
  44. tty.go
  45. update.go
  46. utils.go
  47. utils_linux.go
  48. 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.

Currently, the following features are not considered to be production-ready:

  • Support for cgroup v2


The reporting process and disclosure communications are outlined in /org/security.


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

You can also use go get to install to your GOPATH, assuming that you have a github.com parent folder already created under src:

go get github.com/opencontainers/runc
cd $GOPATH/src/github.com/opencontainers/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 support
ambientambient capability supportkernel 4.3
nokmemdisable kernel memory account

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"

You can run a specific integration test by setting the TESTPATH variable.

# make test TESTPATH="/checkpoint.bats"

You can run a test in your proxy environment by setting DOCKER_BUILD_PROXY and DOCKER_RUN_PROXY variables.

# make test DOCKER_BUILD_PROXY="--build-arg HTTP_PROXY=http://yourproxy/" DOCKER_RUN_PROXY="-e HTTP_PROXY=http://yourproxy/"

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 allows higher level systems to augment the containers creation logic with setup of various settings after the container is created and/or before it is deleted. For example, the container's network stack is commonly set up after create but before start.

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.

Note: In order to use this feature, “User Namespaces” must be compiled and enabled in your kernel. There are various ways to do this depending on your distribution:

  • Confirm CONFIG_USER_NS=y is set in your kernel configuration (normally found in /proc/config.gz)
  • Arch/Debian: echo 1 > /proc/sys/kernel/unprivileged_userns_clone
  • RHEL/CentOS 7: echo 28633 > /proc/sys/user/max_user_namespaces

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



The code and docs are released under the Apache 2.0 license.