Ubuntu – How to adjust the instance size that Juju uses

In summary, if you wanted to deploy with m2.xlarge:

 juju deploy mysql --constraints 'instance-type=m2.xlarge'

Or if you want your deployment script to be more portable between providers:

 juju deploy mysql --constraints 'mem=8G'

Here are the corresponding documents:

• https://jujucharms.com/docs/2.0/reference-constraints

Yes, you can ssh directly into any juju node with juju ssh, for example:

juju ssh mysql/0

or just the machine # if you want to do it that way:

juju ssh 0 

This will ssh you into whichever unit of whichever service. I prefer to do it by service name because I tend to mix up numbers. If you're looking to debug a charm however, you should check out juju debug-hooks, which is an interactive ssh/tmux session designed to do exactly what you're doing.

If you're not on a Juju enabled box and need to SSH in, you need to find the IP/hostname of the machine to ssh to. In the case of Amazon or HP Cloud you can get this information via the usual CLI tools or by using the web console to get the IP that the provider has assigned the instance.

• https://jujucharms.com/docs/stable/developer-debugging