打开Shift Node Js：服务器在上传图像时响应错误

Question

当我尝试将照片上传到服务时，我的Open shift节点服务器崩溃了。处理此问题的代码是

    var express = require('express');
var app = express();
var server = app.listen(process.env.OPENSHIFT_NODEJS_PORT || 8080, process.env.OPENSHIFT_NODEJS_IP);
var io = require('socket.io').listen(server);
var url = require("url");
var cookieParser = require('cookie-parser');
var fs = require('fs')
//Databse Loading
var Datastore = require('nedb')
, db = new Datastore({ filename: './db/users.json', autoload: true });
postsDB = new Datastore({ filename: './db/posts.json', autoload: true });
followDB = new Datastore({ filename: './db/follow.json', autoload: true });
likeDB = new Datastore({ filename: './db/like.json', autoload: true });
notifDB = new Datastore({ filename: './db/notif.json', autoload: true });

app.use(express.static('frontend'));
app.use(express.static('frontend/uploads'));
app.use('/user', express.static(__dirname + '/public'))
app.use('/uploads', express.static(process.env.OPENSHIFT_DATA_DIR+'/uploads'));
app.use('/uploads', express.static(__dirname + '/uploads'))

只使用fs包上传图片。

处理图片展示位置的代码如下

  socket.on('Image Post', function(ext, buffer, location, postData) {
  console.log(ext);
  postsDB.insert([postData], function (err, newDocs) {
    if(err){console.log(err)}
    else{
      console.log(newDocs);
      var fileName = process.env.OPENSHIFT_DATA_DIR + '/frontend/uploads' + "/" + newDocs[0]._id + ext;
      fs.open(fileName, 'a', 0755, function(err, fd) {
        if (err) throw err;
        fs.write(fd, buffer, null, 'Binary', function(err, written, buff) {
          fs.close(fd, function() {
            console.log('File saved successful!');
          });
        });
      });
    }
})

}）;

再次感谢。