Hello,
I'm testing stack updates with instance group and wait conditions and
I'd like to get feedback from the Heat community.
My template declares an instance group resource with size = N and a wait
condition resource with count = N (N being passed as a parameter of the
template). Each group's instance is calling cfn-signal (with a different
id!) at the end of the user data script and my stack creates with no error.
Now when I update my stack to run N+X instances, the instance group gets
updated with size=N+X but since the wait condition is deleted and
recreated, the count value should either be updated to X or my existing
instances should re-execute cfn-signal.
To cope with this situation, I've found 2 options:
1/ declare 2 parameters in my template: nb of instances (N for creation,
N+X for update) and count of wait conditions (N for creation, X for
update). See [1] for the details.
2/ declare only one parameter in my template (the size of the group) and
leverage cfn-hup on the existing instances to re-execute cfn-signal. See
[2] for the details.
The solution 1 is not really user-friendly and I found that solution 2
is a bit complicated. Does anybody know a simpler way to achieve the
same result?
Regards,
[1] http://paste.openstack.org/show/47142/
[2] http://paste.openstack.org/show/47148/
--
Simon Pasquier
Software Engineer
Bull, Architect of an Open World
Phone: + 33 4 76 29 71 49
http://www.bull.com
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