How to set constraints for a machine
Constraints at the machine level can be set when adding a machine with the
add-machine command. Doing so provides a way to override defaults at the all-units, application, model, and all-models levels.
Once such a machine has been provisioned, it can be used for an initial deployment (
deploy) or a scale-out deployment (
add-unit). See Deploying to specific machines for the command syntax to use.
A machine with a constraint can be added in this way:
juju add-machine --constraints arch=arm
To add a machine that is connected to a space, for example
juju add-machine --constraints spaces=storage
If a space constraint is prefixed by ‘^’, then the machine will not be connected to that space. For example, the command below will result in an instance that is connected to both the
internal spaces but not connected to either the
See the network spaces page for details on spaces.
For a LXD cloud, to create a machine limited to two CPUs:
juju add-machine --constraints cores=2
To add eight Xenial machines such that they are evenly distributed among four availability zones:
juju add-machine -n 8 --series xenial --constraints zones=us-east-1a,us-east-1b,us-east-1c,us-east-1d
Last updated 5 months ago.