To install your own copy of NSD you have two options: use the version provided by your package manager, or download the source and building it yourself.
Installing via the package manager is the easiest option, and on most systems even trivial. The downside is the distributed version can be outdated for some distributions or not have all the compile-time options included that you want. Building and compiling NSD yourself ensures that you have the latest version and all the compile-time options you desire.
NSD consists of two programs: the zone compiler
zonec and the name server
nsd itself. The name server works with an intermediate database prepared by
the zone compiler from standard zone files.
For NSD operation this means that zones have to be compiled by
NSD can use them. All this can be controlled via
rc.d (SIGTERM, SIGHUP) or
:command:`nsd-control`, and uses a simple configuration file
Installing with a package manager
Most package managers maintain a version of NSD, although this version can be outdated if this package has not been updated recently. If you like to upgrade to the latest version, we recommend :ref:`compiling NSD yourself<Building from source/Compiling>`.
Installing NSD with the built-in package manager should be as easy as:
sudo apt update sudo apt install nsd
This gives you a compiled and running version of NSD ready to :doc:`be configured<configuration>`.
Building from source/Compiling
Ubuntu 20.04 LTS
First of all, we need our copy of the NSD code. On our website you can find the latest version and the changelog. In this example we'll use version 4.3.7. Please note that this is not the latest version currently.
wget https://nlnetlabs.nl/downloads/nsd/nsd-4.3.7.tar.gz tar xzf nsd-4.3.7.tar.gz
We'll need some tools, such as a compiler and the :command:`make` program.
sudo apt update sudo apt install -y build-essential
The library components NSD needs are:
libevent, of which we need
the "dev" version.
sudo apt install -y libssl-dev sudo apt install -y libevent-dev
We'll also need the tools to build the actual program. For this, NSD uses
:command:`make` and internally it uses
yacc, which we need to
download as well.
sudo apt install -y bison sudo apt install -y flex
With all the requirements met, we can now start the compilation process in the NSD directory. The first step here is configuring. With :option:`./configure -h` you can look at the extensive list of configurables for NSD. A nice feature is that :command:`configure` will tell you what it's missing during configuration.
After successfully compiling, we can install NSD to make it available for the machine.
sudo make install
We now have fully compiled and installed version of NSD, and can continue to testing it.
A simple test to determine if the installation was successful is to invoke the :command:`nsd` command with the :option:`-V` option, which is the "version" option. This shows the version and build options used and proves installation was successful.
If all the previous steps were successful we can continue to configuring our NSD instance.
Another handy trick you can use during testing is to run NSD in the foreground using the :option:`-d` option and increase the verbosity level using the :option:`-V 3` option. This allows you to see steps NSD takes and also where it fails.
Now that NSD is installed we can :doc:`continue to configuring it<configuration>`.