You can have multiple NIS servers on the same domain acting as Master and Slaves all managing one central user database.
The server acts as the central repository for all user names, passwords, and groups. The data is replicated from the /etc/passwd file to NIS databases.
On the server, you need to install a package called ypserv.
type apt-get install ypserv if you are using a debian based distribution or type
yum install ypserv if you are using a Red Hat derivative one.
After installing ypserv you need to setup a domain name that is used by server and client.
to setup your domain name type
to make it persistent edit /etc/sysconfig/network file and add the following line
NISDOMAIN = example
were example is the name of your domain,
From now on, every time you add a user, delete a user, you have to update the NIS database. You can do this using the command:
make -C /var/yp
you should setup a cron job to run every hour or so to update the database for you automatically, do this by typing in crontab -e
and then adding the following line to your crontab file
0 * * * * make -C /var/yp &> /dev/null
this will build your nis database at the top of every hour
save the filestart the NIS server by typing
The server is now ready to handle authentication requests from the clients.On the client, you need to install the yp-tools package, apt-get install yp-tools
for debian based distro's and yum install yp-tools for red hat derivative ones
which will open your gui configuration program
click on enable NIS
and then click on configure NIS
enter the domain name ie example
and the ip address of your NIS server. if you don't have a gui then you can alternatively edit your /etc/yp.conf file, and point it to the appropriate server and domain name by adding the following line
domain example server servers_ip_address
The /etc/nsswitch.conf file lists the order for how lookups for various things are done, such as DNS lookup, user authentication, etc . to make NIS authentication faster, change the following in your /etc/nsswitch.conf file from:passwd: files nisplus nis
shadow: files nisplus nis
group: files nisplus nis
To the following:
passwd: nis files nisplus
shadow : nis files nisplus
group: nis files nisplus
you will now be able to login to your client machine using the
usernames that are stored on your NIS Server. you will get
an error about not being able to mount your home directory, but my
next post on automounting home directories centrally addresses that problem