fn start

$ fn start

SERVER COMMANDS
  fn start - Start a local Fn server
    
USAGE
  fn [global options] start [command options] 
    
DESCRIPTION
  This command starts a local Fn server by downloading its docker image.
    
COMMAND OPTIONS
  --log-level value       --log-level debug to enable debugging
  --detach, -d            Run container in background.
  --env-file value        Path to Fn server configuration file.
  --version value         Specify a specific fnproject/fnserver version to run, ex: '1.2.3'. (default: "latest")
  --port value, -p value  Specify port number to bind to on the host. (default: 8080)
  

Some link