Debian 9 Stretch
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Configure NIS Slave2017/06/25
 
Configure NIS Slave Server to continue NIS service if NIS master server would be down. 
+----------------------+          |          +----------------------+
| [    NIS Server    ] |10.0.0.30 | 10.0.0.31| [    NIS Client    ] |
|     dlp.srv.world    +----------+----------+     www.srv.world    |
|                      |          |          |                      |
+----------------------+          |          +----------------------+
+----------------------+          |
| [     NIS Slave    ] |10.0.0.51 |
|   node01.srv.world   +----------+
|                      |
+----------------------+
[1]
Configure NIS Slave Server as a NIS Client.
[2] Configure as a NIS Slave.
root@node01:~#
vi /etc/default/nis
# line 6: change (NIS slave)

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
# add to the end: IP range you allowto access

255.255.255.0   10.0.0.0
root@node01:~#
vi /var/yp/Makefile
# line 52: change

MERGE_PASSWD=
true
# line 56: change

MERGE_GROUP=
true
root@node01:~#
vi /etc/hosts 
127.0.0.1       localhost
# add own IP for NIS

10.0.0.51       node01.srv.world        node01
root@node01:~#
systemctl restart nis

# 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]
NIS master server is also required to be a NIS client. Configure NIS master server as a NIS Client, refer to here.
[4] Configure on NIS master server for new NIS Slave.
root@dlp:~#
vi /var/yp/Makefile
# line 23: change

NOPUSH=
false
# update NIS database

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
       
# specify NIS slave

        next host to add:
node01.srv.world

        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

We need a few minutes to build the databases...
Building /var/yp/srv.world/ypservers...
...
...
Now you can run ypinit -s dlp.srv.world on all slave server.
[5] Configure on NIS Client to bind NIS slave, too.
root@www:~#
vi /etc/yp.conf
# add slave server's setting to the end

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