Parametrizing node name in Elixir Exrm

Question

I want to use Exrm with Erlang distributed on a single machine.

I need to create multiple releases that differ only with node name.

I know, I can configure node name in rel/vm.args, but it will be static. Can I somehow generate multiple releases with different node name?

Answer 1

I am researching the same issue. A possible approach:

The rel/vm.args supports OS environment variables parametrization. So you can do something like

## Name of the node
-name ${MY_NODE_NAME}

## Cookie for distributed erlang
-setcookie ${MY_COOKIE}

Then you would invoke in batch file:

export RELX_REPLACE_OS_VARS=true
export MY_NODE_NAME=foobar@my_host
export MY_COOKIE=foobar

Note RELX_REPLACE_OS_VARS -- it is important!