Re: [libvirt-users] libvirt 0.9.9: could not open /dev/net/tun: Operation not permitted
Subject: [libvirt-users] libvirt 0.9.9: could not open /dev/net/tun:
Operation not permitted
Hi, I'm running the latest libvirt 0.9.9.
I'm trying to start a VIF of type "Ethernet". I know there are problems
with that because you need to be root in order to control the tun/tap
driver.
I changed my qemu.conf file to
user = "root"
group = "root"
clear_emulator_capabilities = 0
However, I still get an error when trying to start my VM:
[root]# virsh start vm-0-3
error: Failed to start domain vm-0-3
error: internal error process exited while connecting to monitor: qemu-
system-x86_64: -net tap,ifname=vif-0-3,script=/etc/libvirt/qemu/vif-
vnet-up,vlan=0,name=hostnet0: could not open /dev/net/tun: Operation
not permitted
qemu-system-x86_64: -net tap,ifname=vif-0-
3,script=/etc/libvirt/qemu/vif-vnet-up,vlan=0,name=hostnet0: Device
'tap' could not be initialized
I run the latest qemu-kvm.
The permissions on the tun device are set to default settings and my
scripts are executable by anyone:
[root ~]# ll /dev/net/tun
crw-rw---- 1 root root 10, 200 Jan 20 15:39 /dev/net/tun
[root ~]# ll /etc/libvirt/qemu/vif-vnet-*
-rwxrwxrwx 1 root root 150 Jan 17 15:52 /etc/libvirt/qemu/vif-vnet-down
-rwxrwxrwx 1 root root 137 Jan 19 17:51 /etc/libvirt/qemu/vif-vnet-up
Any idea what I'm doing wrong here? I have actually also compiled
libvirt with --without capng, so it should not drop capabilities
anyway. Why does it not run as root?
Thanks,
Anna
The full error message is actually this:
LC_ALL=C
PATH=/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
HOME=/root USER=root LOGNAME=root QEMU_AUDIO_DRV=none /usr/local/bin/qemu-system-x86_64 -S
-M pc-1.0 -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 -name vm-0-3 -uuid
284b4d32-ca8a-ee80-8bf3-d58e763f0b47 -nodefconfig -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/vm-0-3.monitor,server,nowait -mon
chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -drive
file=/var/lib/libvirt/images/testdisk.img,if=none,id=drive-ide0-0-0,format=raw -device
ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive
file=/home/sup/vmConfigDir/vm-0-3/vm-0-3.iso,if=none,media=cdrom,id=drive-ide0-1-1,readonly=on,format=raw
-device ide-drive,bus=ide.1,unit=1,drive=drive-ide0-1-1,id=ide0-1-1 -device
e1000,vlan=0,id=net0,mac=52:54:99:ff:15:17,bus=pci.0,addr=0x3 -net
tap,ifname=vif-0-3,script=/etc/libvirt/qemu/vif-vnet-up,vlan=0,name=hostnet0 -usb -vnc
127.0.0.1:9 -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
Domain id=1 is tainted: high-privileges
Domain id=1 is tainted: shell-scripts
qemu-system-x86_64: -net
tap,ifname=vif-0-3,script=/etc/libvirt/qemu/vif-vnet-up,vlan=0,name=hostnet0: could not
open /dev/net/tun: Operation not permitted
qemu-system-x86_64: -net
tap,ifname=vif-0-3,script=/etc/libvirt/qemu/vif-vnet-up,vlan=0,name=hostnet0: Device
'tap' could not be initialized
I can run the QEMU command manually from the shell, so I'm 100% sure this is a problem
related to libvirt.
Thanks,
Anna