Can ansible do dshbak-like output?

[ja...@jrib.net]

Hello,

I use "ansible -m shell" quite a bit.  I would like ansible to not show me the output multiple times if it is identical on several machines.  The dshbak tool for pdsh [0] and clush -b from clustershell [1] are examples of similar tools that behave in the desired way.  I wrote a simple proof of concept for ansible at https://github.com/jrib/ansbak .

What happens now:

> $ ansible host1:host2 -m shell -a 'echo foo\\nbar'

> host1 | success | rc=0 >>

> foo

> bar

> 

> host2 | success | rc=0 >>

> foo

> bar

What I want to happen:

> $ ansible host1:host2 -m shell -a 'echo foo\\nbar'  | ansbak.py

> ['host1', 'host2'] | success | rc=0 >>

> foo

> bar

My questions are:

1. Does something like this already exist?

2. Is ansbak a good approach?  What features should I add?

3. Would it be preferable to add this feature directly to ansible?  (hints where welcomed)

Thanks!

Jason

[0] https://code.google.com/p/pdsh/

[1] http://cea-hpc.github.io/clustershell/

[Michael DeHaan]

Doesn't currently exist, I suspect architecturally that wouldn't fit for a large number of systems that exceed the fork count, but you might have a go and find out :)

-- Michael

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[Yaroslav Halchenko]

FWIW  I would second having such a feature builtin, e.g. even just having something like a --collate option would be really nice.  --diff could be also very neat to not just collate common output as a whole into one, but rather visualize where output is the same (across all hosts) and where differs.  Both modes would be useful not only for -m shell but others (e.g.  setup) as well, so not really module dependent.

Cheers!

[Michael DeHaan]

I'd welcome experimentation with the callbacks classes maybe, I don't think a thing on top of ansible is appropriate.

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