gistfile1.txt

> cat .zshfunc/vnc 
# -*- sh -*-
## vim:ft=zsh:foldmethod=marker

local HOST VM

if [ $# -lt 2 ]; then
    echo "Usage: $0 HOST VM"
    return
fi
HOST=$1
VM=$2

LPORT=$(( $RANDOM % 10000 + 5900))
VNCDISPLAY=$(ssh $HOST "gnt-instance list --no-headers -o name,network_port | awk '/^$VM/ { print \$2 - 5900 } END { exit 1; }' || virsh -c qemu:///system vncdisplay $VM | sed s/://")

ssh -N -f -L ${LPORT}:localhost:$(( $VNCDISPLAY + 5900 )) $HOST
gvncviewer localhost:$(( $LPORT - 5900 ))