## Async

Run tasks asynchronously to avoid blocking:

### Key Parameters

- `async`: Maximum number of seconds to wait for the task to complete
- `poll`: Number of seconds to wait between checks (0 means no polling)

### Example Playbook

```yaml
- name: Restart service asynchronously
  service:
    name: apache2
    state: restarted
  async: 10
  poll: 0

# Check async task status:
# ansible-playbook site.yml --check
``` 

### Best Practices

1. Use async for long-running tasks (e.g., backups, migrations)
2. Combine with `ignore_errors: yes` for resilient task execution
3. Monitor task status using `async_status` module
4. Use `--check` flag to simulate async operations

### Troubleshooting

- Check task output with `--verbosity=2`
- Use `async_status` to track task progress:
  ```yaml
  - name: Check async task status
    async_status:
      jid: "{{ async_jid }}"
    register: task_result
  ```