Debian 11 Bullseye
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NIS : Configure Secondary Server2021/09/06

Configure NIS Secondary Server to continue NIS service if NIS Primary server would be down.
+----------------------+          |          +----------------------+
| [    NIS Primary   ] | || [    NIS Client    ] |
|    +----------+----------+    |
|                      |          |          |                      |
+----------------------+          |          +----------------------+
+----------------------+          |
| [   NIS Secondary  ] | |
|   +----------+
|                      |

[2] Configure NIS Secondary Server.
vi /etc/default/nis
# line 11 : change (set NIS secondary)

vi /etc/ypserv.securenets
# This line gives access to everybody. PLEASE ADJUST!
# comment out


# add to the end : IP range you allow to access

systemctl restart ypserv

systemctl enable ypserv
# sync with NIS master server

/usr/lib/yp/ypinit -s

We will need a few minutes to copy the data from
Transferring group.bygid...
Trying ypxfrd ... success


At this point, make sure that /etc/passwd and /etc/group have
been edited so that when the NIS is activated, the data bases you
have just created will be used, instead of the /etc ASCII files.
[3] Configure on NIS primary server for new NIS secondary host.
vi /var/yp/Makefile
# line 23 : change

# update NIS databaseć–°

/usr/lib/yp/ypinit -m

At this point, we have to construct a list of the hosts which will run NIS
servers. is in the list of NIS server hosts.  Please continue to add
the names for the other hosts, one per line.  When you are done with the
list, type a <control D>.
        next host to add:
        next host to add:   # specify NIS secondary
        next host to add:                     # Ctrl + D key
The current list of NIS servers looks like this:

Is this correct?  [y/n: y] y

..... has been set up as a NIS master server.

Now you can run ypinit -s on all slave server.
[4] Configure on NIS Client to bind NIS secondary, too.
vi /etc/yp.conf
# add secondary server's setting to the end

domain server
domain server
systemctl restart nis
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