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root@SERVER:~# cat /etc/passwd | grep www-data
www-data:x:33:33:www-data:/var/www:/bin/sh

root@SERVER:~# ls -al /cluster/www/html/tmp/reportexport_274.xml
-rwxrwxrwx 1 www-data www-data 908 2011-03-30 14:03 /cluster/www/html/tmp/reportexport_274.xml

root@SERVER:~# sudo -u www-data cat /cluster/www/html/tmp/reportexport_274.xml
cat: /cluster/www/html/tmp/reportexport_274.xml: Permission denied

The directory is an nfs mount:

x:/cluster/www /cluster/www nfs _netdev,rw,soft,intr,rsize=32768,wsize=32768,nosuid,nodev,noatime,timeo=15 0 0

Linux x 2.6.32-31-server #61-Ubuntu SMP Fri Apr 8 19:44:42 UTC 2011 x86_64 GNU/Linux

How can this be? am I missing something?

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2 Answers 2

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How about sudo -u www-data ls -l /cluster/www/html/tmp/? Perhaps www-data is missing permissions to reach the directory entry. If that's the case chown/chmod each directory up to tmp so they are readable/executable by www-data.

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  • sudo -u www-data ls -l /cluster/www/html/tmp/*.xml ls: cannot access /cluster/www/html/tmp/export_274.xml: Permission denied
    – Fivetide
    May 10, 2011 at 12:52
  • @user80973: do sudo -u www-data ls -ld /cluster/www/html/tmp, sudo -u www-data ls -ld /cluster/www/html, etc. until it doesn't result in an error or you get to /cluster. You have to change the permissions in the directories giving permission errors by using chmod a+rx /path/to/dir. At the very least you'll probably have to execute chmod a+rx /cluster/www/html/tmp.
    – Eduardo Ivanec
    May 10, 2011 at 12:55
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    yeh it was missing the lack of +x . :)
    – Fivetide
    May 10, 2011 at 12:58
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Check that the directories in the path all in some manner allow user www-data read and execute permission.

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