# Start an on-demand practice run
<a name="getting-started-cli-zonal-autoshift.start-practice-run"></a>

You can start an on-demand practice run zonal shift with the CLI by using the `start-practice-run` command.

For example, to start a practice run for a resource, use a command like the following:

```
aws arc-zonal-shift start-practice-run 
    --resource-identifier="arn:aws:elasticloadbalancing:{{Region}}:{{111122223333}}:{{ExampleALB123456890}}" \
    "awayFrom": "usw2-az1",
```

```
{
    "awayFrom": "usw2-az1",
    "comment": "Practice run started. Shifting traffic away from Availability Zone usw2-az1.",
}
```