获取502错误的网关：尝试在PCF平台中使用节点js连接mongodb时，注册端点无法处理请求

Question

I have mongodb in AWS EC2 instance .

I am trying to connec to mongodb instance from nodejs server using mongoClient . My node application is deployed on PCF platform.

When i try to connect to mongodb
it throws an error " 502 Bad Gateway :

Registered endpoint failed to handle the request". My node application is working fine, one the connection with mongodb is causing the problem.

conn_str += req.params.dbname;
mongoClient.connect(conn_str, function(err, db) {
    if(err) {
        res.end(err);
    } else {
        res.end(db);
    }
});

Help much appreciated.

Answer 1

Ok. I had faced a similar issue while I was trying to connect to my mongo cluster which was deployed on Google Compute Engine. The below checklist helped me resolve the issue

1. Check if your firewall and make sure that the port 27017 is open for external requests
2. Check if your MongoDB is up and running (just do a curl localhost:27017 from terminal) if it's running you should get the protocol error
3. Check if your MongoDB is configured to accept requests from applications that is outside it's network (if you're running on different VPC) -- By default, MongoDB doesn't allow external requests