Commits on Feb 6, 2023

1. Clear DNS configuration received from DHCP during networking reconfig… …

   …uration in Linux. (sonic-net#13516)
   
   - Why I did it
   fixes sonic-net#12907
   
   When the management interface IP address configuration changes from dynamic to static the DNS configuration (retrieved from the DHCP server) in /etc/resolv.conf remains uncleared. This leads to a DNS configuration pointing to the wrong nameserver. To make the behavior clear DNS configuration received from DHCP should be cleared.
   
   - How I did it
   Use resolvconf package for managing DNS configuration. It is capable of tracking the source of DNS configuration and puts the configuration retrieved from the DHCP servers into a separate file. This allows the implementation of DNS configuration cleanup retrieved from DHCP during networking reconfiguration.
   
   - How to verify it
   Ensure that the management interface has no static configuration.
   Check that /etc/resolv.conf has DNS configuration.
   Configure a static IP address on the management interface.
   Verify that /etc/resolv.conf has no DNS configuration.
   Remove the static IP address from the management interface.
   Verify that /etc/resolv.conf has DNS configuration retrieved form DHCP server.

   

   oleksandrivantsiv authored and mssonicbld committed Feb 6, 2023
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