Erlang nodes can't see each other

Question

I am new to Erlang and trying to set two nodes on my laptop.

In one terminal I type:

eli@elimayost: ~/erlang_apps> erl -sname foo -setcookie secret

And in the second terminal:

eli@elimayost: ~/erlang_apps> erl -sname bar -setcookie secret

If I use the first terminal to ping the second:

(foo@elimayost)1> net_adm:ping(bar@elimayost).

I get a pang response (same response if I use the second term to ping the first term).

Any idea why?

Answer 1

Try starting the nodes like this:

eli@elimayost: ~/erlang_apps> erl -sname foo@elimayost -setcookie secret
eli@elimayost: ~/erlang_apps> erl -sname bar@elimayost -setcookie secret

Then ping them like you did before.

(foo@elimayost)1> net_adm:ping(bar@elimayost).

If that doesn't work for you, try pinging the node from itself.

Answer 2

Did You check the syslog for errors?

Is apparmor active? Maybe turn it off and try again. One day I had very strange effects with apparmor running... but it is just a guess.

Answer 3

it's a DNS problem, your host name 'elimayost' can't be found on the DNS. You can use 'localhost' as the host part, which like 'foo@localhost' and 'bar@localhost', it will always work.