kvm ifup on convirt

Some time ago a Kernel change broke a qemu-kvm feature known as ifup script.

I came across this while i was installing convirt (a nice web management tool for not only kvm). New VMs with bridged ethernet just wouldnt start and spit out an error like:

could not configure /dev/net/tun (tap%d): Operation not permitted

A few google searches later i tried the suggestion over linux capabilities (libcap2), but that did not worked for me. Also running the VMs as root was not an option!

Luckily, /usr/sbin/kvm is just a symlink on gentoo, so i made a little wrapper-script for creating the tap interfaces on demand!

Be aware that your ifup-script might be called different, if youre not using convirt! I also had to set the suid bit on brctl as well as tunctl!


NEWTAP=`tunctl -u convirt | cut -d “‘” -f 2`
/sbin/brctl addif br0 $NEWTAP

for PARAM in $@; do
if `echo $PARAM | grep -q “qemu-ifup-br0″ `; then
NEWPARAM=`echo $PARAM | sed ‘s//etc/kvm/qemu-ifup-br0/no,ifname=’$NEWTAP’/g’`

/usr/bin/qemu-kvm $PARAMSTRING

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