Python Read-only file system Error With S3 and Lambda when opening a file for reading

Question

I\'m seeing the below error from my lambda function when I drop a file.csv into an S3 bucket. The file is not large and I even added a 60 second sleep prior to opening the f

Answer 1

Only /tmp seems to be writable in AWS Lambda.

Therefore this would work:

filepath = '/tmp/' + key

Answer 2

I noticed when I uploaded a code for lambda directly as a zip file I was able to write only to /tmp folder, but when uploaded code from S3 I was able to write to the project root folder too.

Answer 3

According to http://boto3.readthedocs.io/en/latest/guide/s3-example-download-file.html

The example shows how to use the first parameter for the cloud name and the second parameter for the local path to be downloaded.

in other hand, the amazaon docs, says

Thus, we have 512 MB for create files. Here is my code for me in lambda aws, for me works like charm.

.download_file(Key=nombre_archivo,Filename='/tmp/{}'.format(nuevo_nombre))