Hi,
I just started playing around with ansible and tried to achieve a simple
operations task with it:
Iterate over all nodes of my Xen-Cluster -- get free_memory of every node
and sum up those values.
next step would be making a decision e.g. spawning a new VM without
overprovisioning the cluster.
So I wrote a simple module which collects "xm info" values as
ansible_facts. This was easy...
Next step: write a playbook which sums up one of the collected fact
(free_memory) -- here I got stuck and have no more ideas how to solve
this...
This is a not working idea:
# vim:ft=ansible:
---
- hosts: Cluster
vars:
# should be initially set to zero??
sum_free_memory: "{{ sum_free_memory|int + xm_infos.free_memory|int }}"
tasks:
- name: gather xen facts
xm_info:
- name: show free_memory on host
debug: msg="{{ xm_infos.free_memory|int }}"
- name: increment sum_free_memory
debug: msg="{{ sum_free_memory|int }}"
=> which obviously doesn't work:
ERROR: recursive loop detected in template string: {{ sum_free_memory|int +
xm_infos.free_memory|int }}
So how can I sum up collected facts from more than one host?
Cheers
Ulli
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