Google app engine 部署期间，云sql无法连接到应用程序引擎

应用程序引擎：灵活

CloudSQL：第二代

框架：Node.js

节点库：mysql

部署后，我看到此错误：

2016/10/29 11:38:03 listenInstance: "santex-1101:asia-east1:santexdb"

2016/10/29 11:38:03 Remove("/cloudsql/santex-1101:asia-east1:santexdb") error: remove /cloudsql/santex-1101:asia-east1:santexdb: no such file or directory

2016/10/29 11:38:03 Open socket for "santex-1101:asia-east1:santexdb" at "/cloudsql/santex-1101:asia-east1:santexdb"

2016/10/29 11:38:03 Socket prefix: /cloudsql

2016/10/29 11:39:20 listenInstance: "santex-1101:asia-east1:santexdb"

2016/10/29 11:39:20 Remove("/cloudsql/santex-1101:asia-east1:santexdb") error: remove /cloudsql/santex-1101:asia-east1:santexdb: no such file or directory

2016/10/29 11:39:20 Open socket for "santex-1101:asia-east1:santexdb" at "/cloudsql/santex-1101:asia-east1:santexdb"

2016/10/29 11:39:20 Socket prefix: /cloudsql

app.js：

var pool = mysql.createPool({
    connectionLimit: 100,
    multipleStatements: true,
    user: config.get('MYSQL_USER'),
    password: config.get('MYSQL_PASSWORD'),
    database: config.get('MYSQL_DATABASE'),
    socketPath: "/cloudsql/santex-1101:asia-east1:santexdb"
});

app.yaml：

runtime: nodejs
vm: true

beta_settings:
    cloud_sql_instances: "santex-1101:asia-east1:santexdb"

我不确定是什么导致了这个问题

我还将ssh插入到vm中进行检查，我可以看到/cloudsql/santex-1101:asia-east1:santexdb是存在的

请帮忙

提前感谢,， 计时器