Chef and erb templates. How to use boolean code blocks

I am new to chef, ruby, ruby DSL, and erb. I come from python. In a ruby erb template I want to do something like this.

<% if node[:monit][:server]=='nginx' -%>

ALL OF MY NGINX TEXT 

<% end -%>

<% if node[:monit][:server]=='redis' -%>

ALL OF MY REDIS TEXT 

<% end -%>

Clearly I am missing something about proper syntax.

Thanks