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I am trying to run BIND under chroot on Ubuntu and CentOS. Installing it on CentOS is pretty straight forward with just installing the packages - bind and bind-chroot, while Ubuntu is a little more involved.

I've been following the below links to get it running on Ubuntu,

https://help.ubuntu.com/community/BIND9ServerHowto

http://www.tokiwinter.com/installing-chrooted-bind-ubuntu-12-04-server/

I can get it up and running but I am unable to figure out if BIND is running in chroot.

From what I can see it isn't running in chroot since there is no pid file inside the chroot directory but instead there is still a pid file in the /var/run/named directory.

Also trying to see where the process directory is mapped using the below

[root@centos-test etc]# ls -ld /proc/2839/root
lrwxrwxrwx. 1 named named 0 Feb 11 04:01 /proc/2839/root -> /
[root@centos-test etc]# 

But from what i read at various places the above command is supposed to point to the chroot'ed directory if it is running inside a jail.

How can i accurately identify that I am inside a chroot jail or not?

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It's simple: if named is running with -t <directory> flag, then it's chrooted. Otherwise - it's not.

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