title: Azure function apps : [Errno 30] Read-only file system
body: <p>I'm developing an API using Azure Function Apps. The API works fine locally (using localhost). However, after publishing to Function App, I'm getting this error:</p>
  <blockquote>
  <p>[Errno 30] Read-only file system</p>
  </blockquote>
  <p>This error happens after I made the connection as a function to allow establishing new connection every time the API is requested. The data is taken from Azure Blob Storage container.
  The code:</p>
  <p><code>DBConnection.py</code>:</p>
  <pre><code>import os, uuid
  from azure.storage.blob import BlockBlobService, AppendBlobService
  from datetime import datetime
  import pandas as pd
  import dask.dataframe as dd
  import logging
  
  def BlobConnection() :
  
      try:
          print(&quot;Connecting...&quot;)
          #Establish connection
  
          container_name = 'somecontainer'
          blob_name = 'some_name.csv'
          file_path = 'somepath'
          account_name = 'XXXXXX'
          account_key = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
  
          blobService = BlockBlobService(account_name=account_name, account_key=account_key)
  
  
          blobService.get_blob_to_path(container_name, blob_name, file_path)
  
          df = dd.read_csv(file_path, dtype={'Bearing': 'int64', 'Speed': 'int64'})
          df = df.compute()
          
          return df
  
      except Exception as ex:
          print('Unable to connect!')
          print('Exception:')
          print(ex)
  </code></pre>