Comment 8 for bug 1388860

I've reproduced the error in eu-west-1, where I have a default VPC, by deleting the default subnet from one of the AZs. I'm going to change Juju to (for now) skip over AZs where the region has default VPC but the AZ has no default subnet.

@jam and anyone else wanting to test this sort of thing in the future, see "Availability" at http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/default-vpc.html. Unless you test all the regions, you've probably got a default VPC in one of the regions. Just be aware that deleting a default subnet is not something you revert without contacting AWS support.

> Still, the behavior from juju seemed to place new machines into the same AZ
> every time a new machine was added. This meant no new machines were usable.

Not sure what you mean here. Why does it mean no new machines were usable?