combining with_nested: + with_together: (incl. loop count limit)

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1

Hi,

(this email was previously send to the incorrect list [1])

I've got 3 sets of data:

foo: [ A, B, C, D, ...]
bar: [ 1, 2 ]
tra: [ a, b ]

foo should be combined with bar and tra in a nested loop, but bar and
tra should loop together.

something like (not actually working):

- debug: msg="{{ item[0] }} {{ item[1][0] }} {{ item[1][1] }}
  with_netsted:
   - foo
   - item
   with_together:
    - bar
    - tra

Expected output:

A1a
A2b
B1a
B2b
C1a
C2b
...

How would I actually combine with_nested: and with_together?

In addition to that I will need a loop termination once it reached a
certain amount of loop executions.
On a simple loop I would use 'with_indexed_items:' and check the index
against a given max value. How would that loop count limit be
implemented in the loop described above?

thanks!
Nusenu

[1] https://groups.google.com/d/msg/ansible-devel/aLrH_SC8HyY/FZPs7GanHysJ

2

I got it working. I combined 'bar' and 'tra' in a dictionary and used
that in with_nested

Now I'm left with the question: How can I limit the amount of loops in
a with_nested loop?

3

How can I limit the amount of loops in a with_nested loop?

I still didn't find a solution for this. Maybe someone can suggest
alternative approaches if the use case is clear:

I've got two use cases where I would need an index counter within a
with_nested loop (or any other solution that gets the job done):

1) limit number of service instances based on available machine memory

basically something like:
create process instances
with_nested:
- set1
- set2
when: machine_memory / loopIndex+1 > minimalmemoryrequired

but there is no "loopIndex" that I could use..

2) assign unique TCP port to a service to prevent duplicate bindings

here is the ansible role where this would be useful for me:
https://github.com/nusenu/relayor/blob/master/tasks/configure.yml

thanks,
Nusenu