can't restart or reload networking.service (error: cannot add dependency job)

[scyto]

As some are aware my networking was messy the last cfew days (through entirely my own contributions).

• I moved back to the proxmox current repo version of ifupown2
• I removed all SDN configuration and hit apply, all my VMs continue to work
• the network seems stable

I have this error below on all nodes and it blocks systemctl restart and reload commands on networking.service, it doesn't seem to cause any issue and a reboot fixes. I was wondering if there was a way to fix without rebooting?

Apr 24 10:41:16 pve1 systemd[1]: networking.service: Cannot add dependency job, ignoring: Unit networking.service failed to load properly, please adjust/correct and reload service manager: Device or resource busy
Apr 24 10:41:22 pve1 systemd[1]: networking.service: Cannot add dependency job, ignoring: Unit networking.service failed to load properly, please adjust/correct and reload service manager: Device or resource busy
Apr 24 11:11:38 pve1 systemd[1]: networking.service: Cannot add dependency job, ignoring: Unit networking.service failed to load properly, please adjust/correct and reload service manager: Device or resource busy
[root@pve1 11:12:30]$ systemctl reload networking.service
Failed to reload networking.service: Unit networking.service failed to load properly, please adjust/correct and reload service manager: Device or resource busy
See system logs and 'systemctl status networking.service' for details.
[root@pve1 11:12:38]$ systemctl restart networking.service
Failed to restart networking.service: Unit networking.service failed to load properly, please adjust/correct and reload service manager: Device or resource busy
See system logs and 'systemctl status networking.service' for details.

if the answer is 'shrug' i can just reboot al 3 nodes, but if anyones more analysis let me know (it would seem essential the service is never left in this state)

 

[shanreich]

Oftentimes caused by issues with ifupdown2 reloading the network configuration. You can check the debug output of reloading via:

ifreload -avd

Also, as the error message says you might already find the issue in the systemlogs via journalctl.

 

[scyto]

Oftentimes caused by issues with ifupdown2 reloading the network configuration. You can check the debug output of reloading via:

ifreload -avd

Also, as the error message says you might already find the issue in the systemlogs via journalctl.

thanks output attached, notes:

• pve1 is the node where networking.service won't reload
• pve3 is the node i rebooted and networking service does reload
• i note both nodes are still tying to do bgp things, i checked frr.conf and despite my SDN config being empty in the ui it seem it never cleanedup the bgp settings from within frr.conf... i can remove by hand so no biggie i suspect based on this i may have copied frr.conf > frr.conf.local and caused this, so likely unrelated note

this is the point in the joural on pve1 where the error was encountered

Apr 25 08:56:17 pve1 root[3584322]: Attempting to restart frr.service for lo
Apr 25 08:56:17 pve1 systemd[1]: networking.service: Cannot add dependency job, ignoring: Unit networking.service failed to load properly, please adjust/correct and reload service manager: Device or resource busy

there is no corresponding error after the lo restart (which is a script i wrote that calls frr restart when if-up is processed because lo was changed). The script is the same on both nodes.

I am ok to just reboot the two remaining nodes with the restart issue if thats easier, I will lave the repro up until you tell me to reboot