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vmr providers are "tools" that manage the virtual machines instances such as VirtualBox (default in vmr), docker, vmware, aws, openstack, ...
Actually only VirtualBox is available in vmr package.
vmr can manage some of virtualbox options.
Options available can be find here:
vb.opt <- virtualboxOptions(details = FALSE)
To set a name to the virtualbox machine:
vb.opt$name <- "My Virtualbox name"
To disable GUI:
vb.opt$gui <- FALSE
To add more cpus and memory:
vb.opt$modifyvm$cpus <- 3 vb.opt$modifyvm$memory <- 8192
More options can be find here https://www.virtualbox.org/manual/ch08.html#vboxmanage-modifyvm
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