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getpwnam issue

January 04, 2011 03:43PM
Hello all,

I am testing a chroot'ed nginx setup on Debian Lenny and am receiving the error: `getpwnam("www-data") failed` when I try to start nginx. My search to find a possible solution have so far been fruitless but I am hoping someone smarter than I could offer some advice.

I've setup the "jail" in /chroot/nginx, created the relevant directory structure (/dev/, /etc, /usr, /var, etc.). Then I copied files that "ldd `which nginx`" showed as linked to the relevant directories, and also copied what I believe are the necessary /etc/* files to /chroot/nginx/etc/. So my directory structure is basically as follows:

/chroot/nginx (base chroot directory)
/etc
passwd, shadow, group, hosts, nsswitch.conf, resolv.conf
/nginx
nginx.conf,
/sites-{available, enabled}
/usr
/sbin
nginx
/lib
*(some shared library files here)
/lib
libnss_dns* files, libnss_compat* files, libnss_files*, and some other shared library files here
/var
/dev
/tmp

(that's a non-exhaustive overview, but is hopefullly enough to diagnose the problem)

I know that it's not a getpwnam() issue, as I found a forum discussion which involves troubleshooting the getpwnam() function with a simple C program to ensure that getpwnam() is indeed working properly. I've tested this and it works as expected in a non-chroot setting (discussion is here, it's in Russian, so you may need to use Google Translate: http://forum.nginx.org/read.php?21,128545,129156#msg-129156).

I am using the start-stop-daemon to manage nginx with a script similar to this: http://snippets.aktagon.com/snippets/155-nginx-startup-script-for-Debian. So to start nginx I run:

# start-stop-daemon --start --pidfile /var/run/nginx/nginx.pid --exec /usr/sbin/nginx --chroot /chroot/nginx

And this is what throws the error. I think that it's really an issue of having my paths or permissions wrong such that getpwnam() cannot read/find the passwd file, but my attempts to change permissions, owners, and paths have not been successful. Any advice or suggestions would be appreciated!

Thanks,

Chad
Subject Author Posted

getpwnam issue

chadmiko January 04, 2011 03:43PM

Re: getpwnam issue

chadmiko January 04, 2011 05:52PM

Re: getpwnam issue

doublerebel January 12, 2011 04:09PM



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