如何连接到已注册的节点（Erlang）并从另一个erlang应用程序使用它

Question

I have a node started on

erl -name n1@198.XXX.X.XX -setcookie somecookie

(n1@198.XXX.X.XX)>

but then I have another erlang application in which I have a module where I want to use the node that I have just registered (n1@198.XXX.X.XX). I tried to do do directly from code net_adm:ping(n1@198.XXX.X.XX). and I get a pang. I can see that net_adm:names(). returns in the tuple all the registered and living nodes.{ok [{node, 999}],[{n1,9993}],[{theappnode, 8383}]}

I need a way to connect to n1, and then use to to ping another remote node with rpc, something like

conn = connect to node (n1) and then do the rpc... these all from the module code of another erlang application.... Is the above possible?

Answer 1

Possibly your other node wasn't started with the same cookie. You have two solutions:

1. Start the other node with the same cookie

    erl -name otherapp -setcookie some cookie 1> net_adm:ping('n1@198.XXX'). pong 

2. Start the other node and tell it what is the cookie of the n1 node.

    erl -name otherapp 1> net_adm:ping('n1@198.XXX'). pang 2> erlang:set_cookie('n1@198.XXX', 'somecookie'). true 3> net_adm:ping('n1@198.XXX'). pong 

You cannot mix short names and long names (-sname and -name) in a distributed cluster.