Hi,
Many thanks for these ideas, since this posting was held back for
moderation (it was my first one in this group) I asked the question on irc
channel and got the tip: simply write a filter to collect the necessary
data to a list which can be summed up."ktosiek" from irc channel wrote me
the start of a filter which I modified to solve my problem :D
this is the Filter:
def multiget(dictionary, keys):
return [int(dictionary[k]['xm_infos']['free_memory']) for k in keys]
which can then be used in a playbook like this:
- name: show the sum
debug: msg="{{ hostvars | multiget(keys=groups.Cluster)|sum }}"
The first Idea was to have the filter more generally to use it like this:
debug: msg="{{ hostvars |
multiget(keys=groups.Cluster)|sum(attribute=xm_infos.free_memory) }}"
But the values inside the list must be casted to int and I had no other
Idea than to do this inside the generation of the list.
Cheers
Ulli
PS: I like ansible more and more especially the really cool and helpfull
community ;-D
Am Sonntag, 4. Januar 2015 02:02:04 UTC+1 schrieb Ulrich Hochholdinger:
>
> 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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