[action] [PR:19583] [Static DNS] Optimize DNS configuration update during interface-config service restart (#19583) #19985
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…g service restart (sonic-net#19583) #### Why I did it The `resolvconfig` service updates the DNS configuration in the host OS and each running Docker container when a configuration change is detected. The DNS configuration update during the shutdown of the management interface is redundant, as the management interface is going down temporarily and, when it is back online, the DNS configuration will remain the same. The update of the DNS configuration adds a couple of seconds (depending on the CPU) to the interface-config service restart time when the management interface uses a dynamic IP address. This can affect the fast boot. To optimize the flow and execute the service restart faster, the update should be skipped. #### How I did it Do not run DNS configuration update during the shutdown of the management interface. #### How to verify it Measure the execution time of the `service interfaces-config restart` command on the device with the static IP address configuration on the management interface and compare it to the execution time of the same command with the dynamic IP address. The difference should be insignificant.
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Original PR: #19583 |
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Why I did it
The
resolvconfigservice updates the DNS configuration in the host OS and each running Docker container when a configuration change is detected. The DNS configuration update during the shutdown of the management interface is redundant, as the management interface is going down temporarily and, when it is back online, the DNS configuration will remain the same. The update of the DNS configuration adds a couple of seconds (depending on the CPU) to the interface-config service restart time when the management interface uses a dynamic IP address. This can affect the fast boot. To optimize the flow and execute the service restart faster, the update should be skipped.How I did it
Do not run DNS configuration update during the shutdown of the management interface.
How to verify it
Measure the execution time of the
service interfaces-config restartcommand on the device with the static IP address configuration on the management interface and compare it to the execution time of the same command with the dynamic IP address. The difference should be insignificant.