Make the Docker cluster on Google Compute Engine

Called by as.cluster

makeDockerClusterPSOCK(workers, docker_image = "rocker/r-parallel",
  rscript = c("docker", "run", "--net=host", docker_image, "Rscript"),
  rscript_args = NULL, install_future = FALSE, ..., verbose = FALSE)

Arguments

workers	The VMs being called upon
docker_image	The docker image to use on the cluster
rscript	The Rscript command to run on the cluster
rscript_args	Arguments to the RScript
install_future	Whether to check if future is installed first (not needed if using docker derived from rocker/r-parallel which is recommended)
...	Other arguments passed to makeClusterPSOCK
verbose	How much feedback to show