[action] [PR:16490] Fix potentially not having any loopback address on lo interface#16627
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mssonicbld merged 1 commit intosonic-net:202211from Oct 20, 2023
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…c-net#16490) In sonic-net#15080, there was a command added to re-add 127.0.0.1/8 to the lo interface when the networking configuration is being brought down. However, the trigger for that command is `down`, which, looking at ifupdown2 configuration files, runs immediately after 127.0.0.1/16 is removed. This means there may be a period of time where there are no loopback addresses assigned to the lo interface, and redis commands will fail. Fix this by changing this to pre-down, which should run well before 127.0.0.1/16 is removed, and should always leave lo with a loopback address. Signed-off-by: Saikrishna Arcot <[email protected]>
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Original PR: #16490 |
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Why I did it
In #15080, there was a command added to re-add 127.0.0.1/8 to the lo interface when the networking configuration is being brought down. However, the trigger for that command is
down, which, looking at ifupdown2 configuration files, runs immediately after 127.0.0.1/16 is removed. This means there may be a period of time where there are no loopback addresses assigned to the lo interface, and redis commands will fail.Work item tracking
How I did it
Fix this by changing this to pre-down, which should run well before 127.0.0.1/16 is removed, and should always leave lo with a loopback address.
How to verify it
This is a race condition with a small timing window for the issue to occur. Killing the teamd container or repeated config reloads may be the best way to try to trigger this.
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)