A nice way to express the above might be to use group ranges:
- hosts: specific_group[0:5]
Though often this is controlled by tags. Say, for instance, you are on EC2
and use the "ec2" module with the "exact_count" parameter to set the number
of images with the "webserver" tag to 25 instances.
Then, using the ec2 dynamic inventory, talk to all machines with that tag:
- hosts: ec2_tag_webserver
roles:
- ...
That may provide an alternative way of dealing with things if it's
applicable.
On Mon, Sep 29, 2014 at 10:09 AM, Michael Peters <[email protected]>
wrote:
> Do you need to do this randomly and then remember which ones were
> randomly chosen? Or could you just, say, work with the first X in a
> group? If the latter, you might be able to do something like this
> (untested) to do the first 3 servers in a specific_group:
>
> hosts: specific_group[0]:specific_group[1]:specific_group[2]
> roles:
> - foo
>
> You could also try creating a new sub-group in your inventory that is
> comprised of something like the above. Again, not sure if that would
> work.
>
> On Mon, Sep 29, 2014 at 5:16 AM, <[email protected]> wrote:
> > Hi,
> >
> > I want to install specific role on part of the hosts in a host group.
> Not a
> > rolling update, but as an absolute limit of some process installation in
> > entire host group.
> > So, according to that number process will be installed or removed from
> > instance to adjust.
> >
> > How can i implement this?
> >
> > Regards,
> > Leonid
> >
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