The dockercontainerpause command suspends all processes in the specified containers. On Linux, this
uses the freezer cgroup. Traditionally, when suspending a process the SIGSTOP signal is used, which is
observable by the process being suspended. With the freezer cgroup the process is unaware, and unable to
capture, that it is being suspended, and subsequently resumed. On Windows, only Hyper-V containers can be
paused.
See the freezer cgroup documentation
⟨https://www.kernel.org/doc/Documentation/cgroup-v1/freezer-subsystem.txt⟩ for further details.
docker-container-unpause(1) to unpause all processes within a container.