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For the record, in my node template I’m setting the Cloud Init URL to a yaml file hosted on a server with this config:

#cloud-config
runcmd:
- ["sudo", "mkfs.ext4", "/dev/sda"]
- ["sudo", "ros", "install", "-d", "/dev/sda", "--no-reboot", "-c", "/var/lib/rancher/conf/cloud-config.yml"]
- ["sudo", "reboot"]
rancher:
  sysctl:
    vm.max_map_count: 2621444

I need this because I want to use persistent storage via a vmdk disk, I provision a 20GB OS disk for all of my nodes.