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Merge pull request #290 from dqminh/exec-spec

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add spec for exec a new process inside a container
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Rohit Jnagal
2014-12-12 09:20:35 -08:00
parent f925aa3503 eb2ae34c80
commit 4940cee052
1 changed files with 25 additions and 0 deletions
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SPEC.md
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@@ -318,4 +318,29 @@ a container.
| Resume | Resume all processes inside the container if paused |
| Exec | Execute a new process inside of the container ( requires setns ) |
### Execute a new process inside of a running container.
User can execute a new process inside of a running container. Any binaries to be
executed must be accessible within the container's rootfs.
The started process will run inside the container's rootfs. Any changes
made by the process to the container's filesystem will persist after the
process finished executing.
The started process will join all the container's existing namespaces. When the
container is paused, the process will also be paused and will resume when
the container is unpaused. The started process will only run when the container's
primary process (PID 1) is running, and will not be restarted when the container
is restarted.
#### Planned additions
The started process will have its own cgroups nested inside the container's
cgroups. This is used for process tracking and optionally resource allocation
handling for the new process. Freezer cgroup is required, the rest of the cgroups
are optional. The process executor must place its pid inside the correct
cgroups before starting the process. This is done so that no child processes or
threads can escape the cgroups.
When the process is stopped, the process executor will try (in a best-effort way)
to stop all its children and remove the sub-cgroups.