Would you please say, How to troubleshoot KVM issues? I have some linux VMs, And I had 'em running for weeks. But today one of them just won't start anymore. I cannot figure out with is wrong.
When i click "Start" in web console, i see green notification, that the VM has started. But it is not. If follow syslog during VM start i see the following:
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root@eve-ng:/var/log# brctl show
bridge name bridge id STP enabled interfaces
pnet0 8000.000c29a64738 no eth0
pnet1 8000.000000000000 no
pnet2 8000.000000000000 no
pnet3 8000.000000000000 no
pnet4 8000.000000000000 no
pnet5 8000.000000000000 no
pnet6 8000.000000000000 no
pnet7 8000.000000000000 no
pnet8 8000.000000000000 no
pnet9 8000.000000000000 no
vnet0_10 8000.4a0a86ed3eab no vunl0_2_2
vunl0_8_0
vnet0_2 8000.761917c9b876 no vunl0_2_0
vnet0_4 8000.defdfb09d1f0 no vunl0_2_3
vnet0_5 8000.820959c052c3 no vunl0_2_1
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Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl del-port vunl0_2_0
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00002|db_ctl_base|ERR|no port named vunl0_2_0
Dec 15 12:32:35 eve-ng kernel: [ 1941.204535] vnet0_2: port 1(vunl0_2_0) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.204537] vnet0_2: port 1(vunl0_2_0) entered forwarding state
Dec 15 12:32:35 eve-ng kernel: [ 1941.204680] vnet0_2: port 1(vunl0_2_0) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.204738] device vunl0_2_0 left promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.204739] vnet0_2: port 1(vunl0_2_0) entered disabled state
Dec 15 12:32:35 eve-ng systemd-udevd[18566]: Could not generate persistent MAC address for vunl0_2_0: No such file or directory
Dec 15 12:32:35 eve-ng kernel: [ 1941.258816] vnet0_2: port 1(vunl0_2_0) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.258817] vnet0_2: port 1(vunl0_2_0) entered disabled state
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl del-port vunl0_2_1
Dec 15 12:32:35 eve-ng kernel: [ 1941.258915] device vunl0_2_0 entered promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.258955] vnet0_2: port 1(vunl0_2_0) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.258956] vnet0_2: port 1(vunl0_2_0) entered forwarding state
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00002|db_ctl_base|ERR|no port named vunl0_2_1
Dec 15 12:32:35 eve-ng kernel: [ 1941.265144] vnet0_5: port 1(vunl0_2_1) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.265146] vnet0_5: port 1(vunl0_2_1) entered forwarding state
Dec 15 12:32:35 eve-ng kernel: [ 1941.265356] vnet0_5: port 1(vunl0_2_1) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.265475] device vunl0_2_1 left promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.265481] vnet0_5: port 1(vunl0_2_1) entered disabled state
Dec 15 12:32:35 eve-ng systemd-udevd[18657]: Could not generate persistent MAC address for vunl0_2_1: No such file or directory
Dec 15 12:32:35 eve-ng kernel: [ 1941.329449] vnet0_5: port 1(vunl0_2_1) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.329450] vnet0_5: port 1(vunl0_2_1) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.329496] device vunl0_2_1 entered promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.329515] vnet0_5: port 1(vunl0_2_1) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.329516] vnet0_5: port 1(vunl0_2_1) entered forwarding state
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl del-port vunl0_2_2
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00002|db_ctl_base|ERR|no port named vunl0_2_2
Dec 15 12:32:35 eve-ng kernel: [ 1941.335432] vnet0_10: port 1(vunl0_2_2) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.335538] device vunl0_2_2 left promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.335543] vnet0_10: port 1(vunl0_2_2) entered disabled state
Dec 15 12:32:35 eve-ng systemd-udevd[18747]: Could not generate persistent MAC address for vunl0_2_2: No such file or directory
Dec 15 12:32:35 eve-ng kernel: [ 1941.389755] vnet0_10: port 1(vunl0_2_2) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.389756] vnet0_10: port 1(vunl0_2_2) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.389806] device vunl0_2_2 entered promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.389828] vnet0_10: port 1(vunl0_2_2) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.389829] vnet0_10: port 1(vunl0_2_2) entered forwarding state
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl del-port vunl0_2_3
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00002|db_ctl_base|ERR|no port named vunl0_2_3
Dec 15 12:32:35 eve-ng kernel: [ 1941.395991] vnet0_4: port 1(vunl0_2_3) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.396067] device vunl0_2_3 left promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.396073] vnet0_4: port 1(vunl0_2_3) entered disabled state
Dec 15 12:32:35 eve-ng systemd-udevd[18837]: Could not generate persistent MAC address for vunl0_2_3: No such file or directory
Dec 15 12:32:35 eve-ng kernel: [ 1941.447331] vnet0_4: port 1(vunl0_2_3) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.447333] vnet0_4: port 1(vunl0_2_3) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.447377] device vunl0_2_3 entered promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.447396] vnet0_4: port 1(vunl0_2_3) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.447397] vnet0_4: port 1(vunl0_2_3) entered forwarding state
Dec 15 12:32:36 eve-ng kernel: [ 1942.218950] vnet0_4: port 1(vunl0_2_3) entered disabled state
Dec 15 12:32:36 eve-ng kernel: [ 1942.218993] vnet0_10: port 1(vunl0_2_2) entered disabled state
Dec 15 12:32:36 eve-ng kernel: [ 1942.219026] vnet0_5: port 1(vunl0_2_1) entered disabled state
Dec 15 12:32:36 eve-ng kernel: [ 1942.219057] vnet0_2: port 1(vunl0_2_0) entered disabled state
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Dec 15 11:01:29 INFO: starting /opt/unetlab/wrappers/qemu_wrapper -T 0 -D 2 -t "Utm5_a" -F /opt/qemu-2.12.0/bin/qemu-system-x86_64 -d 0 -x -- -device virtio-net-pci,netdev=net0,mac=00:50:00:00:02:00 -netdev tap,id=net0,ifname=vunl0_2_0,script=no -device virtio-net-pci,netdev=net1,mac=00:50:00:00:02:01 -netdev tap,id=net1,ifname=vunl0_2_1,script=no -device virtio-net-pci,netdev=net2,mac=00:50:00:00:02:02 -netdev tap,id=net2,ifname=vunl0_2_2,script=no -device virtio-net-pci,netdev=net3,mac=00:50:00:00:02:03 -netdev tap,id=net3,ifname=vunl0_2_3,script=no -smp 2 -m 8096 -name Utm5_a -uuid 21fdb527-daa8-4e54-9e83-12ae07e7fead -vnc :26870 -hda hda.qcow2 -machine type=pc,accel=kvm -vga std -usbdevice tablet -boot order=dc > /opt/unetlab/tmp/0/fc8a16c1-6f02-4bb6-bfbb-5afb4980ada5/2/wrapper.txt 2>&1 &
Dec 15 11:01:29 INFO: CWD is /opt/unetlab/tmp/0/fc8a16c1-6f02-4bb6-bfbb-5afb4980ada5/2
Dec 15 11:01:29 INFO: sysctl -w net.ipv6.conf.vunl0_2_3.disable_ipv6=1
Dec 15 11:01:29 INFO: tunctl -u unl0 -g root -t vunl0_2_3 2>&1
Dec 15 11:01:29 INFO: sysctl -w net.ipv6.conf.vunl0_2_2.disable_ipv6=1
Dec 15 11:01:29 INFO: tunctl -u unl0 -g root -t vunl0_2_2 2>&1
Dec 15 11:01:29 INFO: sysctl -w net.ipv6.conf.vunl0_2_1.disable_ipv6=1
Dec 15 11:01:29 INFO: tunctl -u unl0 -g root -t vunl0_2_1 2>&1
Dec 15 11:01:29 INFO: sysctl -w net.ipv6.conf.vunl0_2_0.disable_ipv6=1
What's wrong with Network? Why it keep saying there are no interfaces, while we see in brctl that they are? =\