yii2主從配置

'db' => [
    //主庫配置
    'class' => 'yii\db\Connection',
    'dsn' => 'mysql:host=127.0.0.1;dbname=dddd',
    'username' => 'aasd',
    'password' => 'asasd@2sd6fafs',
    'charset' => 'utf8mb4',
    //從庫配置
    'slaveConfig' => [
        'username' => 'ddddd',
        'password' => 'idcd84fsa@aaaa',
        'attributes' => [
            // use a smaller connection timeout
            PDO::ATTR_TIMEOUT => 10,
        ],
    ],
    // list of slave configurations
    'slaves' => [
        ['dsn' => 'rm-111.mysql.rds.aliyuncs.com'],
        ['dsn' => 'rr-222.mysql.rds.aliyuncs.com'],
        ['dsn' => 'rr-333.mysql.rds.aliyuncs.com'],
        ['dsn' => 'rr-4444.mysql.rds.aliyuncs.com'],
    ],
],