[Erlang] Different Nodes

Question 1

Start a node with a short name

Answer 1

$ erl -sname gandalf

Question 2

When should you use a short name, and when should you use a long name?

Answer 2

Start Erlang with the -name parameter. When we have two nodes on the
same machine, we use “short” names (as indicated by the -sname flag), but
if they are on different networks, we use -name.

We can also use -sname on two different machines when they are on the
same subnet. Using -sname is also the only method that will work if no
DNS service is available.

Question 3

Start a node with a long name1

Answer 3

$ erl -name gandalf -setcookie abc

Question 4

Name 3 things to consider when connecting nodes on two different physical machines

Answer 4

• fully qualified hostnames of each node must be resolvable by DNS
• cookie must be the same
• same version of code and Erlang. Without this, weird and hard to debug errors can occur

Question 5

Make a call to a remote node with rpc

Answer 5

rpc:call(gandalf@soundwave, ksv, store, [weather, fine]).