[cherry-pick][202205] Clear DNS configuration received from DHCP during networking reconfiguration in Linux. (#13516) #13695
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…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.
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…reconfiguration in Linux. (sonic-net#13516) (sonic-net#13695)" This reverts commit d1fa414.
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Manual cherry-pick of #13516 due to merge conflict issue.