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Clarify the ha flag usage to get only one Machine #1053

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Sep 20, 2023
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Clarify the ha flag usage to get only one Machine #1053

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18 changes: 17 additions & 1 deletion reference/app-availability.html.markerb
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Expand Up @@ -93,12 +93,28 @@ At a lower level, you can also use the `fly machines update` command with the `-

What if you don't want to keep Machines running all the time for an app with a small or variable workload? The [automatic start and stop feature](#automatically-start-and-stop-machines) is enabled by default for Machines and makes it possible to run at least two Machines without wasting resources.

If you still don't want `fly deploy` to create two Machines, then you can use the `--ha` option to turn off this feature:
If you still don't want `fly launch` or `fly deploy` to create two Machines, then you can use the `--ha` option to turn off this feature.

Create one Machine for a new app:

```cmd
fly launch --ha=false
```

Create one Machine on first deploy or when your app is scaled down to zero Machines:

```cmd
fly deploy --ha=false
```

Scale down an app to one Machine:

```cmd
fly scale count 1
```

For apps with more than one process, refer to [Scale a process group horizontally](/docs/apps/processes/#scale-a-process-group-horizontally).

## Automatically start and stop Machines

Automatic start and stop works for process groups with services defined. This feature enables you to have multiple Machines that only run when needed.
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