Hi,
I'm about to introduce Ansible in a bigger environment for a client.
We have the following dimensions:
- Customer
- Environment (Dev, Test, Int, Demo, Prod)
- Applications / Versions
Which really means: if we have 6 Systems for Customer X in Integration, we
again have 6 Systems for Customer X in Demo and again 6 in Prod...
and then the same applies to Customer Y and so on.
I figured: it would be a good start to have a directory for each customer
with its own inventory for all the staging envs and a role directory which
is shared among all customers (since we're mostly deploying the same
software):
ansible/
customerX
inventory
all
prod
int
test
customerY
inventory
all
prod
int
test
roles
appX
appY
This way, I was able to set some application default under
"roles/appX/defailts/main.yml", which can be overwritten under
customerX/inventory/group_vars/ with customer specific values for example.
So far so good.
*The issue*
There might be configuration which is valid for a certain staging
environment, regardless of the customer. A simple example could be: the db
server port in integration is always the same for all customers (but only
in integration). My original idea was to "reference" the environment in a
role by using group_vars - but that isn't supported. I guess with some
lookups and parametrized calls it would be possible to accomplish this in a
playbook/role. But this seems rather cumbersome to maintain, especially
when expecting additional applications over time.
Then I've added a dirty one line patch to lib/ansible/inventory/__init__.py
to support a global group_vars dir at same level as my customer and shared
role dir:
line 641:
basedirs.extend([self.basedir() + "/../../"])
This currently breaks the priority of the group_vars below the inventory
directory, but I was able to do environment based configuration, as I
wanted.
Example Inventory file "customerX/inventory/integration":
[integration]
192.168.0.1
192.168.0.2
[frontend]
192.168.0.1
[backend]
192.168.0.2
So I'm able to set some variable under "ansible/group_vars/integration" and
also under "ansible/customerX/inventory/group_vars/frontend" which is very
helpful.
Probably I can set global defaults over all roles, customers, environments
in "ansible/global_vars/all" (not tested yet).
So, my questions is: Is there really not other way to accomplish this,
except writing a patch?
Kind regards,
Chris
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