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Maniphest T3371

Replace netplugd by udev rules
Not ApplicablePublicFEATURE REQUEST
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Description

Plain Debian 10 uses the following mechanism to trigger events on link up/down

$ cat /lib/udev/rules.d/80-ifupdown.rules
# Allow rfkill for users in the netdev group
KERNEL=="rfkill", MODE="0664", GROUP="netdev"

# Handle allow-hotplug interfaces
SUBSYSTEM=="net", ACTION=="add|remove", RUN+="ifupdown-hotplug"

VyOS 1.3 and 1.4 both only have two scripts which get executed on link-state changes:

Despite the arguably ancient Perl content, this scripts can also be invoked by a vyos-ifupdown wrapper script or directly. Also the invocation is limited to bridge, ethernet and bond interfaces /etc/netplug/netplugd.conf

Basically its entire purpose is:

  • start DHCP client on linkup
  • stop DHCP client on linkdown

Details

Version
-
Is it a breaking change?
Perfectly compatible

Related Objects
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StatusSubtypeAssignedTask
 Not ApplicableFEATURE REQUESTjestabroT3371 Replace netplugd by udev rules
 On holdNoneT3876 Replace vyos-netplug with a VyOS link state monitor service

Event Timeline

c-po created this task.Feb 28 2021, 10:32 AM
c-po moved this task from Open to Backlog on the VyOS 1.4 Sagitta board.
c-po triaged this task as Normal priority.Feb 28 2021, 10:37 AM
c-po edited a custom field.
c-po changed Is it a breaking change? from Unspecified (possibly destroys the router) to Perfectly compatible.
c-po updated the task description. (Show Details)Feb 28 2021, 10:45 AM
pasik subscribed.Feb 28 2021, 11:06 AM
jack9603301 subscribed.Feb 28 2021, 4:45 PM
c-po claimed this task.Mar 1 2021, 7:09 PM
c-po moved this task from Backlog to In Progress on the VyOS 1.4 Sagitta board.
c-po added a comment.Mar 2 2021, 7:58 PM

Looks like it is not possible using udev: https://stackoverflow.com/questions/40676914/how-to-set-up-a-udev-rule-for-eth-link-down-link-up

ACTION=="add|remove" is only used when a device is added or removed not when a link flaps.

c-po changed the task status from Open to On hold.Mar 3 2021, 8:41 PM
c-po reassigned this task from c-po to jestabro.May 24 2021, 7:46 PM
jestabro added a subtask: T3876: Replace vyos-netplug with a VyOS link state monitor service.Oct 14 2021, 7:54 PM
syncer edited projects, added VyOS 1.4 Sagitta (1.4.0-epa1); removed VyOS 1.4 Sagitta.Feb 23 2024, 12:19 PM
syncer moved this task from Need Triage to In Progress on the VyOS 1.4 Sagitta (1.4.0-epa1) board.
syncer edited projects, added VyOS 1.4 Sagitta (1.4.0-GA); removed VyOS 1.4 Sagitta (1.4.0-epa1).May 15 2024, 9:31 AM
syncer moved this task from Need Triage to In Progress on the VyOS 1.4 Sagitta (1.4.0-GA) board.
jestabro closed this task as Not Applicable.May 15 2024, 5:26 PM
jestabro removed a project: VyOS 1.4 Sagitta (1.4.0-GA).

As c-po mentioned above, this was an interesting idea that was not workable; it was subsumed by the investigations in T3876.

jestabro changed the status of subtask T3876: Replace vyos-netplug with a VyOS link state monitor service from In progress to On hold.May 15 2024, 5:33 PM