Constraints & series support

William Reade william.reade at
Tue Mar 26 01:12:55 UTC 2013

On Sun, 2013-03-24 at 17:28 -0300, Gustavo Niemeyer wrote:
> Hey there,
> Asking as a juju user here: I know there's work in progress both to
> implement constraints and to fix the series support in the Go port.
> When should I expect to be able to use these?

Series support will become useful to amazon users starting at the next

Support for simple constraints is minimally present, but again only on
amazon and only starting with the next release; but, thus far, only the
first machine started actually honours them, and service constraints are
not used.

> I'm happy to run stuff from tip, obviously. :-)

For users running on tip, the story wrt series is slightly different; it
is currently present for amazon environments, but is very hard to use
effectively in dev mode due to incompatibilities between tip and the
latest released tools; in practice, it is very useful if you're running
precise and barely useful at all if you're not. Once we've released some
public tools that can handle it, and until we break compatibility with
those, it will probably be more helpful.


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