Rocketeer. How can I execute commands on different servers after deployment?

I have multiple servers - backend, frontend and api. To deploy the code to servers I am using Rocketeer.

I am using multiple servers for one connection:

'connections' => array(
    'production' => array(
        'servers' => array(
            array(
                'host' => 'xxx.xxx.xxx.xxx', // backend
                'username' => 'admin',
                'password' => 'xxxxxx',
                'key' => '',
                'keyphrase' => '',
            ),
            array(
                'host' => 'xxx.xxx.xxx.xxx', // api
                'username' => 'admin',
                'password' => 'xxxxxx',
                'key' => '',
                'keyphrase' => '',
            ),
            array(
                'host' => 'xxx.xxx.xxx.xxx', // frontend
                'username' => 'admin',
                'password' => 'xxxxxx',
                'key' => '',
                'keyphrase' => '',
            ),          
        ),
    ),
).

      

        
        
        
      

    

It performs its own tasks for each server.

To determine the current connection, I am using the following code in hooks.php

$connection = $task->getConnection();
$server = $connection->connections->getServer();
$credentials = $connection->connections->getServerCredentials($connection->connections->getConnection(), $server);

switch($credentials['host']){
    case 'xxx.xxx.xxx.xxx':
        $task->runForCurrentRelease('...');
        break;
}

      

        
        
        
      

    

The data is uploaded to the servers sequentially.

After deploying to the last server, I am unable to execute the command on the previous servers.

How can I execute commands on different servers after deployment? (ex: restart nginx, restart memcached, etc.)