Command enable-ha

Usage: juju enable-ha [options]

Summary:

Ensure that sufficient controllers exist to provide redundancy.

Options:

-B, --no-browser-login (= false)

Do not use web browser for authentication

-c, --controller (= "")

Controller to operate in

--constraints (= "")

Additional machine constraints

--format (= simple)

Specify output format (json|simple|yaml)

-n (= 0)

Number of controllers to make available

-o, --output (= "")

Specify an output file

--to (= "")

The machine(s) to become controllers, bypasses constraints

Details:

To ensure availability of deployed applications, the Juju infrastructure must itself be highly available. The enable-ha command will ensure that the specified number of controller machines are used to make up the controller.

An odd number of controllers is required.

Examples:

Ensure that the controller is still in highly available mode. If there is only 1 controller running, this will ensure there are 3 running. If you have previously requested more than 3, then that number will be ensured.

juju enable-ha

Ensure that 5 controllers are available.

juju enable-ha -n 5

Ensure that 7 controllers are available, with newly created controller machines having at least 8GB RAM.

juju enable-ha -n 7 --constraints mem=8G

Ensure that 7 controllers are available, with machines server1 and server2 used first, and if necessary, newly created controller machines having at least 8GB RAM.

juju enable-ha -n 7 --to server1,server2 --constraints mem=8G