Upcoming changes for the ec2 provider

Andrew Wilkins andrew.wilkins at canonical.com
Thu Oct 6 23:14:51 UTC 2016


On Thu, Oct 6, 2016 at 8:30 PM Rick Harding <rick.harding at canonical.com>
wrote:

> Thanks Andrew, this is great to hear. Can I bug you about details as to
> how it works? Does this introduce their pricing API as a blocker to
> deploying with Juju? If they introduce a change to the API we miss or their
> API goes down is there any sort of cache of the info that users can
> continue with until service is restored?
>

So I said API because that's what it's called by AWS, but IMO it's a bit of
an overstatement. It's just a set of (very large) JSON files in a well
defined location. Very large, as in 48M for the one file that we need.

Because it's so big, pulling that down each time you go to bootstrap isn't
really reasonable. So for now, we're doing that at build time, and the
information is still hard coded into the client. The process can be
automated, so there shouldn't be a great lag time between updates and
bringing them into a Juju release.

We intend to update Juju later to periodically pull down the JSON file
server-side, asynchronously, so a running controller will get the updates
without us having to release a new Juju or you having to upgrade.

Hope that clarifies things.

Cheers,
Andrew


>
>
> On Thu, Oct 6, 2016 at 4:52 AM Andrew Wilkins <
> andrew.wilkins at canonical.com> wrote:
>
> Hi folks,
>
> Just a heads up to let you know about some changes made to the ec2
> provider, which will show up in Juju 2.0.
>
> We are now pulling down the Price List API (
> http://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/price-changes.html)
> and using that to determine which instance types to launch. This means that
> you will have access to more instance types now, and we should have more
> accurate/up-to-date pricing information, and region availability.
>
> The default constraints for controllers has been modified, so that on ec2
> we will now default controller machines to t2.medium, as long as you have a
> default VPC in your region, or you specify one by ID (--config vpc-id=...).
> We were previously defaulting to m3.medium. The t2.medium instances have a
> little more memory, and 2 CPUs instead of 1. They are burstable instances,
> so they should suit controllers managing a small-to-medium set of
> applications. Controllers are now started with 32GiB root disk, instead of
> 8GiB as they were before.
>
> As before, you can override the defaults by specifying constraints at
> bootstrap time. Also, these changes do not affect non-controller instances.
> If you use "add-machine", you will get an m3.medium if your region supports
> them.
>
> Cheers,
> Andrew
>
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