Ubuntu HPC NIS server setup on master node

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1. Install NIS packages and give nis domain name

   apt -y install nis

   During installation enter private domain name for NIS

2. Configure this server as NIS master server by editing '/etc/default/nis' and updating below two parameter values:

   NISSERVER=master
   NISCLIENT=false

3. Disable access to everyone and Allow NIS server access to sepecific subnet by editing '/etc/ypserv.securenets' as:

   255.255.255.0	   <private-network-address>
   #0.0.0.0            0.0.0.0

4. Initiate NIS database using

   /usr/lib/yp/ypinit -m

5. When prompted with 'When you are done with the list, type a <control D>.', press 'Ctrl+D'.
6. Confirm 'y' on 'Is this correct? [y/n: y' prompt.
7. Restart NIS service

   systemctl restart nis
   systemctl enable nis

8. Create user with home folder under /export/home

   useradd -m  -d  /export/home/user1 -s /bin/bash user1
   passwd user1

9. Update NIS user database

   cd /var/yp
   make

In future whenever there is any change to /etc/passwd, /etc/group, /etc/shadow etc. (eg new user is added, user password is changed) then we need to run below command to update NIS database with latest information

make -C /var/yp

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