Hi,
First off I wanted to say that I've been using Ansible for a while now and
so far I'm really pleased with it.
The product is powerful and flexible and the community is alive and helpful.
I was hoping that some of you might be able to share your insights on how
to best approach the following:
I have 'x' backend hosts and 'y' frontend hosts. Each backend host runs 5
instances of a certain application, each with their own configuration.
Currently I have these defined through group_vars, such as:
[be-hosts]
my-backend-host[1:6]
[fe-hosts]
my-frontend-host[1:15]
This way I can easily apply a playbook against all of the backend or
frontend hosts.
However, the challenge lies in defining the application instances, which
I'd really like to be somewhat more dynamic.
Currently I drive this through host_vars such as:
my-backend-host1
instances: { start: 1, end: 5 }
my-backend-host2
instances: { start: 6, end: 10 }
etc.
One of my roles contains a directory called 'instances' with
sub-directories called instanceN, the files from these directories are
copied/templated using a 'with_sequence' loop.
However, I would really like to be able to specify certain variables on a
host/group level for a specific instance which with this setup I can't;
well I can by defining instanceN.someVariable of course but it's not really
clean, nor is it easy to limit execution to a single instance this way.
In short, I would like to be able to treat those application instances like
one can treat hosts using group_vars / limit etc.
What would also be nice is being able to intelligently allocate the
instances based on the hostname (host1 = 1 - 5, host2 = 6 - 10, host3 = 11
- 15, so that would be something like start=(hostN - 1) * 5 end=(hostN * 5))
Any advice? Would you suggest a completely different approach?
Thanks for sharing your insights,
Nico.
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