Error: could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network

[rimelek (Ákos Takács)]

I don’t know if that example file is a working one. The data-root is empty for example. The system logs would show you what went wrong, but you can just use what I shared, except, you need to insert it in a valid json.

That is a complete file you can try:

{
  "default-address-pools": [
    {
      "base": "172.30.0.0/16",
      "size": 24
    },
    {
      "base": "172.31.0.0/16",
      "size": 24
    }
  ]
}