linux - Mount point with different owner/group permissions?

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We have a media server where all of
our audio, etc. is served out of. A few different servers mount a certain directory on
the media server. I noticed though, that depending on which server I'm looking at the
files from, the owner/group is different.

For
example, on the media server, all of the directories are owned by user
media. On one of our web servers, all of the directories appear
to be owned by the application user. This makes it easy for an application to read and
write data to the media server, without having to give 777 permissions to the
directory.

How is this possible?

On CentOS 5

Answer

Every file has a ID number for the user and group, for
example, 500.

When you
say stat FILE or ls -l it, your system
will use its own /etc/passwd to map
500 to a name - that's why you get a different name on a
different system.

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