Add cgroups freezer info
Docker-DCO-1.1-Signed-off-by: Brian Goff (github: cpuguy83)
Docker-DCO-1.1-Signed-off-by: Brian Goff (github: SvenDowideit)
@@ -764,7 +764,14 @@ log entry.
Usage: docker pause CONTAINER
- Pause all processes within a container
+ Pause uses the cgroups freezer to suspend all processes in a container.
+ Traditionally when suspending a process the SIGSTOP signal is used,
+ which is observable by the process being suspended. With the cgroups freezer
+ the process is unaware, and unable to capture, that it is being suspended,
+ and subsequently resumed.
+
+ For for information on the cgroups freezer see:
+ https://www.kernel.org/doc/Documentation/cgroups/freezer-subsystem.txt
## ps
@@ -1273,7 +1280,7 @@ them to [*Share Images via Repositories*](
Usage: docker unpause CONTAINER
- Pause all processes within a container
+ Resumes a paused container.
## version
