Ubuntu HPC DNS setup on master node

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The nodes in HPC cluster should resolve each other via both short name and FQDN. To help with host resolution centrally, we can setup DNS on master using:

1. Install bind9 package using:

   apt -y install bind9

2. Edit '/etc/bind/named.conf.options' to include:

           forwarders {
                   <primary-dns-ip>;
                   <secondary-dns-ip>;
           };
   
           dnssec-validation no;
           listen-on port 53 { any; };
           allow-query     { localhost; <private-hpc-subnet>; };
           recursion yes;
   
           //listen-on-v6 { any; };

3. Edit '/etc/bind/named.conf.local/tt>' to include:

   zone "<private-zone>." IN {
           type master;
           file "<private-zone>.forward";
   };

4. Create zone file '/var/cache/bind/<private-zone>.foward' Refer Configuring basic DNS service with bind for syntax
5. Restart named using:

   systemctl restart named

6. Validate that settings are working using

   nslookup node<n>.<private-zone> 127.0.0.1

7. Configure localhost as dns and appropriate domain search on master using:

   resolvectl domain <private-interface> <private-zone>
   resolvectl domain <public-interface> <private-zone>
   
   resolvectl dns <public-interface> 127.0.0.1
   resolvectl dns <private-interface> 127.0.0.1

8. Test DNS and search domain settings by using:

   ping node<n>

9. Resolvectl based settings don't persist after reboot. For persistent settings launch following as root user:

   sudo nm-connection-editor

   and change appropriate interface DNS and search settings using the editor.

10. (Optionally) reboot and validate that DNS and domain settings are coming properly after reboot.

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