How do i bootstrap a chef node using knife?

[amurleopard]

# knife bootstrap 10.50.20.5 -x trainer -N sector12 --sudo
Creating new client for sector12
Creating new node for sector12
Connecting to 10.50.20.5
[email protected]'s password:
10.50.20.5 knife sudo password: 
Enter your password: 
10.50.20.5 
10.50.20.5 -----> Existing Chef installation detected
10.50.20.5 Starting the first Chef Client run...
10.50.20.5 Starting Chef Client, version 13.0.118
10.50.20.5 resolving cookbooks for run list: []
10.50.20.5 Synchronizing Cookbooks:
10.50.20.5 Installing Cookbook Gems:
10.50.20.5 Compiling Cookbooks...
10.50.20.5 [2017-04-26T11:02:40+01:00] WARN: Node sector12 has an empty run list.
10.50.20.5 Converging 0 resources
10.50.20.5 
10.50.20.5 Running handlers:
10.50.20.5 Running handlers complete
10.50.20.5 Chef Client finished, 0/0 resources updated in 01 seconds

Check the node has been created.

$ knife client list
panfried-validator
sector12