Some time ago a Kernel change broke a qemu-kvm feature known as ifup script.<\/p>\n
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:<\/p>\n
could not configure \/dev\/net\/tun (tap%d): Operation not permitted <\/strong><\/p>\n 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!<\/p>\n Luckily, \/usr\/sbin\/kvm is just a symlink on gentoo, so i made a little wrapper-script for creating the tap interfaces on demand!<\/p>\n 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!<\/p>\n #!\/bin\/bash<\/p>\n setup_tap() for PARAM in $@; do \/usr\/bin\/qemu-kvm $PARAMSTRING<\/p>\n","protected":false},"excerpt":{"rendered":" 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 … Weiterlesen
\n{
\nNEWTAP=`tunctl -u convirt | cut -d “‘” -f 2`
\n\/sbin\/brctl addif br0 $NEWTAP
\n}<\/p>\n
\nif `echo $PARAM | grep -q “qemu-ifup-br0″ `; then
\nsetup_tap
\nNEWPARAM=`echo $PARAM | sed ‘s\/\/etc\/kvm\/qemu-ifup-br0\/no,ifname=’$NEWTAP’\/g’`
\nPARAMSTRING=”$PARAMSTRING
\n$NEWPARAM”
\nelse
\nPARAMSTRING=”$PARAMSTRING $PARAM”
\nfi
\ndone<\/p>\n