Adding '--cgroup-parent' flag to docker run. This feature helps users implement more complex

resource isolation policies on top of what native docker provides.

Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
Upstream-commit: 0b1e2b5a553565e99afd7ceda36beab098f506d0
Component: engine

components/engine/runconfig/parse.go

@@ -71,6 +71,7 @@ func Parse(cmd *flag.FlagSet, args []string) (*Config, *HostConfig, *flag.FlagSe
 		flRestartPolicy   = cmd.String([]string{"-restart"}, "no", "Restart policy to apply when a container exits")
 		flReadonlyRootfs  = cmd.Bool([]string{"-read-only"}, false, "Mount the container's root filesystem as read only")
 		flLoggingDriver   = cmd.String([]string{"-log-driver"}, "", "Logging driver for container")
+		flCgroupParent    = cmd.String([]string{"-cgroup-parent"}, "", "Optional parent cgroup for the container")
 	)
 
 	cmd.Var(&flAttach, []string{"a", "-attach"}, "Attach to STDIN, STDOUT or STDERR")
@@ -332,6 +333,7 @@ func Parse(cmd *flag.FlagSet, args []string) (*Config, *HostConfig, *flag.FlagSe
 		ReadonlyRootfs:  *flReadonlyRootfs,
 		Ulimits:         flUlimits.GetList(),
 		LogConfig:       LogConfig{Type: *flLoggingDriver},
+		CgroupParent:    *flCgroupParent,
 	}
 
 	// When allocating stdin in attached mode, close stdin at client disconnect