juju HA lands on tip

[Andrew Wilkins]

On Fri, Apr 18, 2014 at 9:12 AM, Richard Harding <rick.harding at canonical.com
> wrote:

> On Thu, 17 Apr 2014, roger peppe wrote:
>
> > I've just landed some changes on juju tip that enable "highly available"
> > juju environments. In a HA environment, there are several state servers -
> > if one dies, one of the others should take over.
> >
> > ...
> >
> > There is one major caveat: upgrading an existing environment
> > to HA is not supported currently (Andrew Wilkins has a branch in review
> that
> > should fix this).
>
> Thanks for the heads up Roger. We'll definitely take a peek at this. From a
> GUI perspective, is this something that can be done via the API or planned
> for that? From our end we'd love to be able to have juju-quickstart
> bootstrap an HA environment. We'd also want to monitor and expose the HA
> status in the GUI. Once the upgrading an existing environment lands, it's
> something we'd like to enable to users to be able to take their current
> environment and bring up a HA state server within it.
>

There is a new client API, EnsureAvailability, that will do what rog has
described.

I'm not sure about monitoring. If there's nothing in the watcher to support
it now, it wouldn't be difficult to add.

These instructions sounds like the work for juju-quickstart should be
> possible to just script into the bootstrap process. The rest I've not look
> into yet.
>
> --
>
> Rick Harding
>
> Juju UI Engineering
> https://launchpad.net/~rharding
> @mitechie
>
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