juju add-unit¶
See also: remove-unit
Summary¶
Adds one or more units to a deployed application.
Usage¶
juju add-unit [options] <application name>
Options¶
Flag |
Default |
Usage |
|---|---|---|
|
Specify an existing storage volume to attach to the deployed unit. |
|
|
Model to operate in. Accepts [<controller name>:]<model name>|<model UUID> |
|
|
1 |
Specify the number of units to add. |
|
(Machine models only) Specify a comma-separated list of placement directives. If the length of this list is less than |
Examples¶
Add five units of mysql on five new machines:
juju add-unit mysql -n 5
Add a unit of mysql to machine 23 (which already exists):
juju add-unit mysql --to 23
Add two units of mysql to existing machines 3 and 4:
juju add-unit mysql -n 2 --to 3,4
Add three units of mysql, one to machine 3 and the others to new machines:
juju add-unit mysql -n 3 --to 3
Add a unit of mysql into a new LXD container on machine 7:
juju add-unit mysql --to lxd:7
Add two units of mysql into two new LXD containers on machine 7:
juju add-unit mysql -n 2 --to lxd:7,lxd:7
Add three units of mysql, one to a new LXD container on machine 7, and the others to new machines:
juju add-unit mysql -n 3 --to lxd:7
Add a unit of mysql to LXD container number 3 on machine 24:
juju add-unit mysql --to 24/lxd/3
Add a unit of mysql to LXD container on a new machine:
juju add-unit mysql --to lxd
Details¶
The add-unitcommand is used to scale out an application for improved performance or
availability.
Note: Some charms will seamlessly support horizontal scaling while others may need an additional application support (e.g. a separate load balancer). See the documentation for specific charms to check how scale-out is supported.
Further reading: