Module wise login in yii2

module.php

<?php

namespace app\modules\admin;

class Module extends \yii\base\Module
{
    public $controllerNamespace = 'app\modules\admin\controllers';

    public function init()
    {
        parent::init();

        \Yii::$app->set('user', [
            'class' => 'yii\web\User',
            'identityClass' => 'app\models\UserAdmin',
            'enableAutoLogin' => true,
            'loginUrl' => ['admin/default/login'],
            'identityCookie' => [
                'name' => '_AdminUserstart', // unique for frontend
            ]
        ]);

        \Yii::$app->set('session', [
            'class' => 'yii\web\Session',
            'name' => '_adminSessionId',
            'savePath' => sys_get_temp_dir(),

        ]);

      }
}