I'm trying to figure out when and how best to use role dependencies.
Currently I have a single role for handling my Postfix configuration on ALL
my hosts; some are classified as 'mail-servers' and the rest as
'mail-clients'. Depending upon a role variable ('mailserver_class') I can
set when I call the role, I ether get one set of Postfix configuration
files or the other.
My site-role.yml currently looks like this:
- hosts: all:!mail-servers
roles:
- { role: postfix, tags: [mail-client] }
- hosts: mail-servers
roles:
- { role: postfix, tags: [mail-server], mailserver_class: server }
This works for me. however, I can see accomplishing basically the same
thing by creating 'mail-client' and 'mail-server' roles that both call
'postfix' as a role dependency, such as:
site-role.yml:
-hosts: all:!mail-servers
roles:
- mail-client
-hosts: mail-servers
roles:
- mail-servers
roles/mail-server/meta/main.yml:
dependencies:
- { role: postfix }
roles/mail-server/meta/main.yml:
dependencies:
- { role: postfix, mailserver_class: server }
To me, it seems that setting up actual 'mail-client' and 'mail-server'
roles each with a dependency on the 'postfix' role is more work and I'm not
sure I really gain anything in this case. On the other hand, by defining
these two roles, I can probably have my different Postfix configuration
templates live under those roles and probably not need the
'mailserver_class' variable. [To be perfectly honest, my gut instinct is
to have everything in the Postfix role and then have internal logic
determine which config file to use - separating the configs to different
role just feel very, very wrong to me.]
So, what thoughts do you have on these layouts? It feels like I can
accomplish the same thing with either layout. I wanted to see what other
people thought about these two cases and what advantages or disadvantages
each layout offered. Your thoughts are appreciated.
thx
Chris.
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