dnsdist software package provides DNS loadbalancer, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install dnsdist
dnsdist is installed in your system.
Make ensure the dnsdist package were installed using the commands given below,
$ sudo dpkg-query -l | grep dnsdist *
You will get with dnsdist package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | dnsdist |
| Version | 1.0.0-2 |
| Description | DNS loadbalancer |
| Sub Section | Net |