I have an requirement that requires all applications running on a server in a DMZ to be chrooted. How does one chroot an application using Ubuntu? Are there any good online guides?
There is no one way to move an application into a chroot jail. Each application has its own dependencies, shared library requirements, etc., all of which need to be taken into consideration when chrooting it.
If you have a specific application you need to chroot, then mention what it is and we can try and give more specific guidance.