'{username}', 'password' => '{password}', )); // 2. Obtain an Orchestration service object from the client. $orchestrationService = $client->orchestrationService(null, '{region}'); // 3. Get stack. $stack = $orchestrationService->getStack('{stackName}'); // 4. Update stack. $stack->update(array( 'template' => '{yamlTemplateFilePath}', 'parameters' => array( 'server_hostname' => '{serverHost}', 'image' => '{image}' ), 'timeoutMins' => 5 ));