Go to file
Daniel Dao 09c72cea69
fix panic regression when config doesnt have caps
When process config doesnt specify capabilities anywhere, we should not panic
because setting capabilities are optional.

Signed-off-by: Daniel Dao <dqminh89@gmail.com>
2017-03-21 00:45:26 +00:00
contrib Remove terminal info 2017-03-16 10:23:59 -07:00
libcontainer fix panic regression when config doesnt have caps 2017-03-21 00:45:26 +00:00
man Only allow single container operation 2017-03-08 10:02:39 +08:00
script move from Godeps to vndr 2017-02-24 11:25:21 +00:00
tests/integration Only allow single container operation 2017-03-08 10:02:39 +08:00
vendor/github.com Update runtime spec to 1.0.0.rc5 2017-03-15 11:38:37 -07:00
.gitignore move from Godeps to vndr 2017-02-24 11:25:21 +00:00
.pullapprove.yml Disallow self-LGTMs 2016-06-01 09:31:21 +08:00
.travis.yml update go version at travis-ci 2017-02-20 13:15:58 +01:00
CONTRIBUTING.md *: add information about security mailing list 2016-12-03 18:54:53 +11:00
Dockerfile update go version at travis-ci 2017-02-20 13:15:58 +01:00
LICENSE Initial commit of runc binary 2015-06-21 19:34:13 -07:00
MAINTAINERS Remove lk4d4 as a maintainer 2017-03-07 13:12:52 -08:00
MAINTAINERS_GUIDE.md Update maintainers guide 2015-07-21 10:59:56 -07:00
Makefile Remove ambient build tag 2017-03-15 11:38:43 -07:00
NOTICE Move libcontainer documenation to root of repo 2015-06-26 11:50:46 -07:00
PRINCIPLES.md Move libcontainer documenation to root of repo 2015-06-26 11:50:46 -07:00
README.md mention vndr in README 2017-02-24 11:25:21 +00:00
VERSION Bump spec and version to rc2 2016-09-28 09:53:43 -07:00
checkpoint.go add pre-dump and parent-path to checkpoint 2017-02-14 19:45:07 +08:00
create.go Add --preserve-fds=N to create and run 2017-02-20 11:50:18 +00:00
delete.go Only allow single container operation 2017-03-08 10:02:39 +08:00
events.go Merge pull request #1205 from YuPengZTE/devError 2017-01-27 21:42:18 +08:00
exec.go Update runtime spec to 1.0.0.rc5 2017-03-15 11:38:37 -07:00
kill.go kill: requires max 2 arguments 2017-02-02 17:32:54 +01:00
list.go Check args numbers before application start 2016-11-29 11:18:51 +08:00
main.go Ensure we log into logrus on command error 2016-10-03 08:01:09 -07:00
main_solaris.go Replace github.com/codegangsta/cli by github.com/urfave/cli 2016-06-06 11:47:20 -07:00
main_unix.go Add error return to action function signature 2016-06-07 14:42:54 -07:00
main_unsupported.go Replace github.com/codegangsta/cli by github.com/urfave/cli 2016-06-06 11:47:20 -07:00
notify_socket.go signals: support detach and notify socket together 2017-02-22 22:28:03 +01:00
pause.go Only allow single container operation 2017-03-08 10:02:39 +08:00
ps.go ps: --format value check 2017-02-22 00:20:23 +08:00
restore.go Add separate console socket 2017-03-16 10:23:59 -07:00
rlimit_linux.go error strings should not be capitalized or end with punctuation 2016-12-01 11:57:16 +08:00
run.go Add --preserve-fds=N to create and run 2017-02-20 11:50:18 +00:00
signals.go signals: support detach and notify socket together 2017-02-22 22:28:03 +01:00
spec.go Update runtime spec to 1.0.0.rc5 2017-03-15 11:38:37 -07:00
start.go Only allow single container operation 2017-03-08 10:02:39 +08:00
state.go Check args numbers before application start 2016-11-29 11:18:51 +08:00
tty.go Add separate console socket 2017-03-16 10:23:59 -07:00
update.go Use uint64 for resources to keep consistency with runtime-spec 2017-03-20 18:51:39 +08:00
utils.go Merge pull request #1308 from giuseppe/fix-systemd-notify 2017-02-24 11:05:21 -08:00
utils_linux.go Remove terminal info 2017-03-16 10:23:59 -07:00
vendor.conf Update runtime spec to 1.0.0.rc5 2017-03-15 11:38:37 -07:00

README.md

runc

Build Status Go Report Card GoDoc

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.

# 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

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

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.

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": [
                        "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                        "TERM=xterm"
                ],
                "cwd": "/",
                "capabilities": [
                        "CAP_AUDIT_WRITE",
                        "CAP_KILL",
                        "CAP_NET_BIND_SERVICE"
                ],
                "rlimits": [
                        {
                                "type": "RLIMIT_NOFILE",
                                "hard": 1024,
                                "soft": 1024
                        }
                ],
                "noNewPrivileges": true
        },

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

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.

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.

[Unit]
Description=Start My Container

[Service]
Type=forking
ExecStart=/usr/local/sbin/runc run -d --pid-file /run/mycontainerid.pid mycontainerid
ExecStopPost=/usr/local/sbin/runc delete mycontainerid
WorkingDirectory=/mycontainer
PIDFile=/run/mycontainerid.pid

[Install]
WantedBy=multi-user.target