# 4.  Configuring Name Service Switch \[/etc/nsswitch.conf]

Now,  we will configure the operating system  to be able to query the Key9 API.   This allows your system to lookup usernames,  groups, etc.  from the Key9 API via the Key9 SSH client.

We will need to modify the /etc/nsswitch.conf file. This can be accomplished using your preferred text editor. In this example, we will utilize `nano`.   You will need to be "root" in order to edit this file.

`sudo nano /etc/nsswitch.conf`

Upon opening the file, it will look something like this.

`passwd: files`

`group: files`

`shadow: files`

There will be other entries in the file, but these are the only ones we will be editing. We will be adding the "k9" option to the end of each line. The file will look something like this:

`passwd: files k9`

`group: files k9`

`shadow: files k9`

Once you make those changes,  save the file.