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   ] |10.0.0.30 | 10.0.0.31| [    NIS Client    ] |
|     dlp.srv.world    +----------+----------+     www.srv.world    |
|                      |          |          |                      |
+----------------------+          |          +----------------------+
+----------------------+          |
| [   NIS Secondary  ] |10.0.0.51 |
|   node01.srv.world   +----------+
|                      |
+----------------------+
[1]
Configure both NIS Primary Server and NIS Secondary Server as a NIS Clients.
[2] Configure NIS Secondary Server.
root@node01:~#
vi /etc/default/nis
# line 11 : change (set NIS secondary)

NISSERVER=
slave
root@node01:~#
vi /etc/ypserv.securenets
# This line gives access to everybody. PLEASE ADJUST!
# comment out

#0.0.0.0                0.0.0.0
#::/0

# add to the end : IP range you allow to access
255.255.255.0   10.0.0.0
root@node01:~#
systemctl restart ypserv

root@node01:~#
systemctl enable ypserv
# sync with NIS master server

root@node01:~#
/usr/lib/yp/ypinit -s dlp.srv.world 

We will need a few minutes to copy the data from dlp.srv.world.
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.
root@dlp:~#
vi /var/yp/Makefile
# line 23 : change

NOPUSH=
false
# update NIS databaseć–°

root@dlp:~#
/usr/lib/yp/ypinit -m 

At this point, we have to construct a list of the hosts which will run NIS
servers.  dlp.srv.world 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:  dlp.srv.world
        next host to add:  node01.srv.world   # specify NIS secondary
        next host to add:                     # Ctrl + D key
The current list of NIS servers looks like this:

dlp.srv.world
node01.srv.world

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

.....
.....

dlp.srv.world has been set up as a NIS master server.

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

domain srv.world server dlp.srv.world
domain srv.world server node01.srv.world
root@client:~#
systemctl restart nis
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