How do I deploy a specific revision of a charm?

Question

I am trying to deploy a charm, mongodb with the following:

juju deploy mongodb

but the newest revision introduced a bug, or for some other reason I want to deploy an older version of the charm, how can I do this?

Answer 1

First off, you need to find out which revision you need. The revision of the charm is completely different from the bzr revision. So for https://jujucharms.com/precise/mongodb/

So the charm revision is 26. Now let's say you think something broke in 26, and you want to try version 25 or earlier.

juju deploy cs:mongodb-25

will give you that revision of the charm. However it is always a good idea to be explicit about the series as well to ensure repeatability:

juju deploy cs:precise/mongodb-25