auto propagate interface status change

["John Lemon" <technikinteressent@xxxxxx>]

Hello,

I'm trying to automatically pass interface status changes (e.g. LAN cable connection/disconnection, ) to a QEMU Debian virt, but the status in the virt is always 'up' (i.e. 'virsh domif-getlink 3 macvtap0' == up).

I'v tried setting 'virsh domif-setlink 3 macvtap1 up' or down, which works (i.e. domif-getlink==down). But I want that state to be automatically propagated to the virt.

The only thing I found after hours of searching was "Default behavior if [..] unspecified is to have the link state up" [2].

 

Do I miss something, or is this simply not integrated??

Best, John

 

 

 

On the host this is what I observed:

------------------------------------------------------------------------------

ip link show|grep enp1s0
3: enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
19: macvtap1@enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state LOWERLAYERDOWN mode DEFAULT group default qlen 500

------------------------------------------------------------------------------

virsh domiflist 3
setlocale: No such file or directory
Interface  Type       Source     Model       MAC
-----------------------------------------------------
macvtap0   direct     enp3s0     virtio      00:30:d6:19:4c:8c
macvtap1   direct     enp1s0     virtio      00:30:d6:19:2a:2d
vnet5      network    vmnet0     virtio      52:54:00:dc:14:e4

------------------------------------------------------------------------------ and

virsh domif-getlink 3 macvtap0
macvtap0 up

 

Following are stats concerning to the bug report how to [1]:

• The version number of the libvirt build, or SHA1 of the GIT commit
  • virsh --version -> 3.0.0
  • ii  gir1.2-libvirt-glib-1.0:amd64   1.0.0-1                        amd64        GObject introspection files for the libvirt-glib library
    ii  libvirt-clients                 3.0.0-4+deb9u1                 amd64        Programs for the libvirt library
    ii  libvirt-daemon                  3.0.0-4+deb9u1                 amd64        Virtualization daemon
    ii  libvirt-daemon-system           3.0.0-4+deb9u1                 amd64        Libvirt daemon configuration files
    ii  libvirt-glib-1.0-0:amd64        1.0.0-1                        amd64        libvirt GLib and GObject mapping library
    ii  libvirt0                        3.0.0-4+deb9u1                 amd64        library for interfacing with different virtualization systems
    ii  python-libvirt                  3.0.0-2                        amd64        libvirt Python bindings
    ii  qemu-kvm                        1:2.8+dfsg-6+deb9u3            amd64        QEMU Full virtualization on x86 hardware
    ii  virt-manager                    1:1.4.0-5                      all          desktop application for managing virtual machines
    ii  virtinst                        1:1.4.0-5                      all          Programs to create and clone virtual machines
     
• The hardware architecture being used
  • x86_64
• The name of the hypervisor (Xen, QEMU, KVM)
  • QEMU
• The XML config of the guest domain if relevant
  •     <interface type='direct'>
          <mac address='00:aa:bb:cc:dd:ee'/>
          <source dev='enp1s0' mode='passthrough'/>
          <model type='virtio'/>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
        </interface>
• For QEMU/KVM, the domain logfile from /var/log/libvirt/qemu

 

[1] https://libvirt.org/bugs.html#quality

[2] https://libvirt.org/formatdomain.html#elementLink

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