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Maniphest T6876

KEA DHCP-server sometimes could be in the race condition
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Description

KEA DHCP-server sometimes could be in the race condition when an interface is not in the UP state.
The server tries to open the socket 5 times with an interval of 5 seconds, then just starts as it is.
In this case, users cannot get leases from the interface, which was in the DOWN state before starting KEA, but it is now in the UP state.

I cannot get configuration from the real users with this issue, and there is no set of commands to reproduce.

Let's assume that this bug exists, so the first that could help is increasing the maximal number of retries that Kea makes to open a socket.

I propose to increase service-sockets-max-retries from 5 to 60

Some related links:
https://arran.physics.gla.ac.uk/wp/igr-it/2024/01/10/kea-dhcp-service-failing-to-open-network-socket-on-boot/
https://gitlab.isc.org/isc-projects/kea/-/issues/3188
https://gitlab.isc.org/isc-projects/kea/-/issues/2776
https://gitlab.isc.org/isc-projects/kea/-/issues/1084

Details

Version
VyOS 1.5-rolling-202410300007
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Bug (incorrect behavior)
Forum thread
https://forum.vyos.io/t/race-condition-on-kea-dhcp-if-interface-isnt-ready-yet/

Related Objects

Event Timeline

Viacheslav created this task.Thu, Nov 14, 2:21 PM
Viacheslav triaged this task as Normal priority.
Viacheslav added a comment.Thu, Nov 14, 2:41 PM

PR https://github.com/vyos/vyos-1x/pull/4192

pasik subscribed.Thu, Nov 14, 5:24 PM
dmbaturin moved this task from Need Triage to Backlog - Bug on the VyOS Rolling board.Fri, Nov 15, 11:51 AM
Viacheslav mentioned this in rVYOSONEX92631e7516bf: T6876: DHCP-server increase retries that Kea makes to open a socket.Fri, Nov 15, 5:56 PM
Restricted Repository Identity mentioned this in rVYOSONEXab470796af60: Merge pull request #4192 from sever-sever/T6876.Fri, Nov 15, 5:56 PM
Viacheslav changed the task status from Open to Needs testing.Fri, Nov 15, 6:40 PM
Viacheslav added a project: VyOS 1.5 Circinus.Wed, Nov 20, 9:10 AM
Viacheslav moved this task from Backlog - Bug to Completed on the VyOS Rolling board.
syncer moved this task from Completed to Backport Candidates on the VyOS Rolling board.Wed, Nov 20, 10:00 AM
Viacheslav closed this task as Resolved.Mon, Nov 25, 10:39 AM
Viacheslav claimed this task.
Viacheslav moved this task from Backport Candidates to Completed on the VyOS Rolling board.
Viacheslav moved this task from Open to Finished on the VyOS 1.5 Circinus board.