Hello,
unionfs doesn't support sendfile.
sendfile is used in apache as default to use kernel itself to send the file

so your problem can be maybe fixed by disabling sendfile in apache conf


Tomas


Nic wrote:
I'm getting a strange thing happening and I just wondered if someone
here had any ideas about how to debug it.

I've got a unionfs filesystem with debian in it. There are 2
directories making up the fs:

- a ro debian base install
- a rw directory

I've installed apache into the debian (so that is all installed into
the rw dir).

I can chroot to the union and start apache fine. It handles requests
apparently normally... but when a page is returned the content of the
page is not recieved. Note that it's only the content - the HTTP
header is delivered perfectly normally.

Wierd.

If I copy the contents of the union to another directory and chroot to
that and run the experiment then it all works perfectly.


Clearly it is unionfs that is freaking things out... but I have no
idea why that would be. Anyone got any clues?



Nic
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