Dear list,
I use Open vSwitch together with libvirt to assign different VMs to different
VLANs. This works well about 95% of the time. However, sometimes a VM gets
assigned to the wrong VLAN.
According to syslog, the following command is executed, with the tag being
correct:
Jan 12 19:04:46 [ovs-vsctl] ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl --timeout=5 -- --may-exist add-port vbr0 vnet1 tag=100 -- set Interface vnet1
"external-ids:attached-mac=\"XX:XX:XX:XX:XX:XX\"" -- set Interface vnet1 "external-ids:iface-id=\"XXXXXXX\"" -- set Interface vnet1 "external-ids:vm-id=\"XXXXXXXXX\"" -- set
Interface vnet1 external-ids:iface-status=active
Yet, the VM's interface is assigned to the wrong VLAN:
# ovs-vsctl show
XXX
Bridge vbr0
Controller "punix:/var/run/openvswitch/vbr0.mgmt"
Port vnet1
tag: 500
Interface vnet1
Port eno1
Interface eno1
Port vbr0
Interface vbr0
type: internal
I *think* that this problem only occurs if one VM is started after another has
been shut down. Unfortunately, I cannot reproduce it reliably.
These are the syslog messages related to Open vSwitch beginning with the start
of the first VM, which was started at 18:13 and shut down at 19:04:
Jan 12 18:13:53 [ovs-vswitchd] ovs|00059|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 18:13:53 [ovs-vsctl] ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl --timeout=5 -- --may-exist add-port vbr0 vnet0 tag=100 -- set Interface vnet0
"external-ids:attached-mac=\"YY:YY:YY:YY:YY:YY\"" -- set Interface vnet0 "external-ids:iface-id=\"YYYYYY\"" -- set Interface vnet0 "external-ids:vm-id=\"YYYYYYY\"" -- set Interface
vnet0 external-ids:iface-status=active
Jan 12 18:13:53 [ovs-vswitchd] ovs|00060|bridge|INFO|bridge vbr0: added
interface vnet0 on port 1
Jan 12 18:13:53 [ovs-vswitchd] ovs|00061|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 18:13:53 [ovs-vswitchd] ovs|00062|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 18:13:53 [ovs-vswitchd] ovs|00063|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 18:13:53 [ovs-vswitchd] ovs|00064|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 18:14:10 [ovs-vswitchd] ovs|00065|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 18:14:10 [ovs-vswitchd] ovs|00066|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 19:04:34 [ovs-vswitchd] ovs|00067|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 19:04:34 [ovs-vswitchd] ovs|00068|ofproto|WARN|vbr0: cannot get STP
status on nonexistent port 1
Jan 12 19:04:34 [ovs-vswitchd] ovs|00069|ofproto|WARN|vbr0: cannot get RSTP
status on nonexistent port 1
Jan 12 19:04:34 [ovs-vswitchd] ovs|00070|bridge|INFO|bridge vbr0: deleted
interface vnet0 on port 1
Jan 12 19:04:34 [ovs-vswitchd] ovs|00071|bridge|WARN|could not open network
device vnet0 (No such device)
Jan 12 19:04:34 [ovs-vswitchd] ovs|00072|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 19:04:39 [ovs-vsctl] ovs|00001|vsctl|INFO|Called as /usr/bin/ovs-vsctl
--timeout=5 -- --if-exists del-port vnet0
Jan 12 19:04:39 [ovs-vswitchd] ovs|00073|bridge|WARN|could not open network
device vnet1 (No such device)
Jan 12 19:04:46 [ovs-vswitchd] ovs|00074|bridge|INFO|bridge vbr0: added
interface vnet1 on port 2
The system runs Gentoo Linux, the Open vSwitch version is 2.17.5 patched with the following patch:
https://raw.githubusercontent.com/gentoo-mirror/gentoo/stable/net-misc/openvswitch/files/xcp-interface-reconfigure-2.3.2.patch
I've been observed this problem for several months, after it has worked correctly for several years. It also occurs with previous versions of the 2.17 series. I can't remember
whether this also occurred with the previous version packaged with Gentoo, which is 2.15.0.
Any advice on how to fix or further debug this problem is highly appreciated.
I'll happily test patches if necessary.
Please CC me as I'm not subscribed.
Best regards
N0T3P4D
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