Is it possible to deploy to specific machine with bundle

Question

I want to make a bundle where I specify which machine to deploy a charm to. Is this possible?

Answer 1

Yes, you can do machine placement with a bundle, note to to argument:

bundlename:
  services:
    mysql:
      # The only machine id supported is machine 0
      to: 0
    wordpress:
      units: 3
    redis-server:
      units: 3
      to: [lxc:wordpress, wordpress]
    ceph:
      units: 4
      to: [wordpress, wordpress, wordpress, wordpress]
    serenade:
      to: lxc:wordpress=2

I do not think it's possible to deploy to a specific machine # other than 0 (because we probably don't know the number until after deployment), so it might be useful to deploy to other service names instead of unit numbers.

Reference:

• http://pythonhosted.org/juju-deployer/config.html#placement

Another option might be to use use machine constraints to ensure you get a certain class of machine.