anchor.diff:  
   % Executed before the proper installation to inform about installation conditions
   setup_confirm_new_cluster() ->
  +	check_open_ports(?ports_to_check),
   	info("Installing a new cluster beside a running one may cause unpredictable behaviour."),
   	info("It is required that all database nodes are installed prior to the cluster."),
   	Option = interaction_choose_option(db_nodes_installed, "Do you wish to continue?", 
  
positive.code: 
  % Firstly check connection to an existing cluster, then ask to choose installation variant
  setup_extend_cluster() ->
  	IPOrHostname = interaction_get_string(ip_or_hostname, "Specify IP/hostname of any host with running veil node(s): "),
  	case discover_cluster(IPOrHostname) of
  		no_connection -> 
  
negative.code: 
  % Default bigcouch port
  -define(default_port,"5986").
  
  %Ports that needs to be free
  -define(ports_to_check,["53","443","5555"]).
  
  % Curl options
  -define(curl_opts,"--connect-timeout 5 -s").
  