code: public void stopPreviouslyStartedContainer(String containerId,
                                                 boolean keepContainer,
                                                 boolean removeVolumes)
          throws DockerAccessException, ExecException {
          ContainerTracker.ContainerShutdownDescriptor descriptor = tracker.removeContainer(containerId);
          if (descriptor != null) {
              shutdown(descriptor, keepContainer, removeVolumes);
          }
      }
docs: Lookup up whether a certain has been already started and registered. If so, stop it
  
  @param containerId the container to stop
  @param keepContainer whether to keep container or to remove them after stoppings
  @param removeVolumes whether to remove volumes after stopping
  
  @throws DockerAccessException