I'm trying to configure Unbound to a function using a caching-only DNS server. When I type the drill command, I get error that says command not found. Refer to the attachment. Please help.
Here, for drill command you need to install idns package and that will help you to run this drill command.
The command for installing IDNS:
sudo yum install Idns
This will work for you.
For more information, check out this DevOps Tutorial.