juju enable-ha¶
Summary¶
Ensure that sufficient controllers exist to provide redundancy.
Options¶
Flag |
Default |
Usage |
|---|---|---|
|
false |
Do not use web browser for authentication |
|
Controller to operate in |
|
|
[] |
Additional machine constraints |
|
simple |
Specify output format (json|simple|yaml) |
|
0 |
Number of controllers to make available |
|
Specify an output file |
|
|
The machine(s) to become controllers, bypasses constraints |
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
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.