Autoscaling group must have a max larger than min

[mbarton]

#32 re-attaches the old instance to the AutoScaling group, which means it must have a max >= min + 1.

I'm probably missing something but would it be easier to create the new instance by simply bumping the DesiredCapacity of the ASG rather than detaching an existing instance?

[tomrf1]

I'm not sure about the reasoning behind the PR you link to, but we had to detach the oldest instance rather than increase the ASG size by one to ensure AZ balance. See #16

[mbarton]

Ah makes sense. @rtyley was it intentional that #32 needs max=(min+ 1)? Happy to run through in person