The way BIND9 running in a chroot environment is started changed between Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.

For more information, see [link:https://access.redhat.com/site/node/770133/].
The article describes how BIND can be run in a chroot environment in Red Hat Enterprise Linux 7, the difference compared to Red Hat Enterprise Linux 6, and the recommendations when running BIND in a chroot environment.

