Kir Kolyshkin
0079bee17f
This adds support for WaitKillableRecv seccomp flag (also known as SCMP_FLTATR_CTL_WAITKILL in libseccomp and as SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV in the kernel). This requires: - libseccomp >= 2.6.0 - libseccomp-golang >= 0.11.0 - linux kernel >= 5.19 Note that this flag does not make sense without NEW_LISTENER, and the kernel returns EINVAL when SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV is set but SECCOMP_FILTER_FLAG_NEW_LISTENER is not set. For runc this means that .linux.seccomp.listenerPath should also be set, and some of the seccomp rules should have SCMP_ACT_NOTIFY action. This is why the flag is tested separately in seccomp-notify.bats. At the moment the only adequate CI environment for this functionality is Fedora 43. On all other platforms (including CentOS 10 and Ubuntu 24.04) it is skipped similar to this: > ok 251 runc run [seccomp] (SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV) # skip requires libseccomp >= 2.6.0 and API level >= 7 (current version: 2.5.6, API level: 6) Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
libcontainer
Libcontainer provides a native Go implementation for creating containers with namespaces, cgroups, capabilities, and filesystem access controls. It allows you to manage the lifecycle of the container performing additional operations after the container is created.
Container
A container is a self contained execution environment that shares the kernel of the host system and which is (optionally) isolated from other containers in the system.
Using libcontainer
For a brief overview of using libcontainer, see example_test.go.
Container init
Because containers are spawned in a two step process you will need a binary that will be executed as the init process for the container. In libcontainer, we use the current binary (/proc/self/exe) to be executed as the init process, and use arg "init", we call the first step process "bootstrap", so you always need a "init" function as the entry of "bootstrap".
In addition to the go init function the early stage bootstrap is handled by importing nsenter.
For details on how runc implements such "init", see ../init.go and init_linux.go.
Checkpoint & Restore
libcontainer now integrates CRIU for checkpointing and restoring containers. This lets you save the state of a process running inside a container to disk, and then restore that state into a new process, on the same machine or on another machine.
criu version 1.5.2 or higher is required to use checkpoint and restore.
If you don't already have criu installed, you can build it from source, following the
online instructions. criu is also installed in the docker image
generated when building libcontainer with docker.
Copyright and license
Code and documentation copyright 2014 Docker, inc. The code and documentation are released under the Apache 2.0 license. The documentation is also released under Creative Commons Attribution 4.0 International License. You may obtain a copy of the license, titled CC-BY-4.0, at http://creativecommons.org/licenses/by/4.0/.