What do you mean by greenbone server? There is no greenbone server. See the architecture fore details
If you mean gvmd/openvasmd by greenbone server, the daemon is already running by default with a local unix socket connection because gsad uses this connection type.
Maybe you should read the section about the connection type in the gvm-tools docs first
https://gvm-tools.readthedocs.io/en/latest/connectiontypes.html