nssd on foreign distro

[Quiliro Ordonez]

https://www.gnu.org/software/guix/manual/en/guix.html#Name-Service-Switch-1
says we must install nss. I have done:
guix package -i nss
on my common user. But I do not know how to start the service. Is this
package really necessary? If it is, must it be on root and not on a
normal user? Or should it be installed from the foreign distro's repos?