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alex3kov avatar alex3kov commented on June 18, 2024

My use case for this: host-only networking for VMs. Bridge needs to start empty (no enslaved interfaces) at boot, then later the hypervisor adds tap* devices to it.
Creating empty bridge works just fine in NetworkManager, but not in netctl:

~: cat /etc/netctl/bridgevm 
Description="Bridge for virtual machines"
Interface=bridgevm
Connection=bridge
BindsToInterfaces=()
IP=static
Address='10.152.152.1/18'
Gateway='10.152.152.1/18'

~: netctl start bridgevm 
Job for [email protected] failed because the control process exited with error code.
See "systemctl status [email protected]" and "journalctl -xe" for details.

~: systemctl status [email protected]
● [email protected] - Networking for netctl profile bridgevm
   Loaded: loaded (/usr/lib/systemd/system/[email protected]; static; vendor preset: disabled)
   Active: failed (Result: exit-code) since Sun 2018-08-12 11:26:50 MSK; 5s ago
     Docs: man:netctl.profile(5)
  Process: 2306 ExecStart=/usr/lib/netctl/network start bridgevm (code=exited, status=1/FAILURE)
 Main PID: 2306 (code=exited, status=1/FAILURE)

Aug 12 11:26:50 arch systemd[1]: Starting Networking for netctl profile bridgevm...
Aug 12 11:26:50 arch network[2306]: Starting network profile 'bridgevm'...
Aug 12 11:26:50 arch network[2306]: Interface 'bridgevm' does not exist
Aug 12 11:26:50 arch network[2306]: Failed to bring the network up for profile 'bridgevm'
Aug 12 11:26:50 arch systemd[1]: [email protected]: Main process exited, code=exited, status=1/FAILURE
Aug 12 11:26:50 arch systemd[1]: [email protected]: Failed with result 'exit-code'.
Aug 12 11:26:50 arch systemd[1]: Failed to start Networking for netctl profile bridgevm.

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joukewitteveen avatar joukewitteveen commented on June 18, 2024

Your status messages include Interface 'bridgevm' does not exist. This message can only appear when the Connection= type is ethernet. Are you sure you are starting the profile you think you are?

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alex3kov avatar alex3kov commented on June 18, 2024

Your status messages include Interface 'bridgevm' does not exist. This message can only appear when the Connection= type is ethernet

Indeed, I had a second Connection= line in the config by accident, which I guess overrode the first one. Problem at 8th network level :)
Creating empty bridge works fine for me.

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