Issue Uploading Files from Rails app hosted on Elastic Beanstalk

Question

I have a Rails 3 app that I'm developing locally and deploying on Amazon's Elastic Beanstalk for production. There's several places in my app where images can be uploaded through HTML forms. After upload, I'm then sending the files to S3 for storage. I have no trouble with this workflow while developing locally, but in production, I'm getting a 500 Internal Server Error response during the upload (I'm fairly sure it's before any communication with S3).

I ssh'ed into my EC2 instance found traces of the error in /var/app/support/logs/passenger.log. Here's the line that's generated during upload.

2013/03/30 00:58:52 [crit] 1723#0: *196227 open() "/tmp/passenger-standalone.1645/client_body_temp/0000000014" failed (2: No such file or directory), client: ip_address, server: _, request: "POST /admin/users/1 HTTP/1.1", host: "www.my_domain.com", referrer: "https://www.my_domain.com/admin/users/1/edit"

Does anyone have any words of wisdom as to why I'm not able to upload a file to Elastic Beanstalk from my Rails?

Thanks in advance for your help!

Answer 1

After some research, I believe the problem is that a daily cronjob (/etc/cron.daily/tmpwatch) is removing the passenger-standalone.* directory that's critical for file uploads.

I was able to get uploads working again by restarting the app server. For a more long term fix, I updated the tmpwatch script to exclude the pattern '/tmp/passenger*' (see below).

#! /bin/sh
flags=-umc
/usr/sbin/tmpwatch "$flags" -x /tmp/.X11-unix -x /tmp/.XIM-unix \
        -x /tmp/.font-unix -x /tmp/.ICE-unix -x /tmp/.Test-unix \
        -X '/tmp/hsperfdata_*' -X '/tmp/passenger*' 10d /tmp
/usr/sbin/tmpwatch "$flags" 30d /var/tmp
for d in /var/{cache/man,catman}/{cat?,X11R6/cat?,local/cat?}; do
    if [ -d "$d" ]; then
        /usr/sbin/tmpwatch "$flags" -f 30d "$d"
    fi
done

Is there another solution that anyone else has found for this issue? I'm not a sys admin guy (which is a big reason why I chose to use Elastic Beanstalk), so I would prefer to not hack with the EC2 instance if at all possible - especially when my app scales and more instances are spawned.

Answer 2

Hopefully fixed in the next version :)

http://code.google.com/p/phusion-passenger/issues/detail?id=654