kvm -smp 4 -m 2048 -name f15 -drive file=~/Fedora-Cloud-Base-20141203-21.x86_64.qcow2,if=virtio -net nic,model=virtio,macaddr=00-11-22-33-55-44 -net tap -localtime

kvm -smp 4 -m 2048 -name f15 -drive file=~/Fedora-Cloud-Base-20141203-21.x86_64.qcow2,if=virtio -net nic,model=virtio,macaddr=1a:46:0b:ca:bc:7b -net tap,fd=3 3<>/dev/tap6

-spice port=5900,addr=192.168.3.148,disable-ticketing

kvm -smp 4 -m 2048 -name f15 -drive file=~/Fedora-Cloud-Base-20141203-21.x86_64.qcow2,if=virtio -net nic,model=virtio,macaddr=1a:46:0b:ca:bc:7b -net tap

nohup kvm -cpu host -nographic -smp 4 -m 2048 -name f15 -drive file=~/Fedora-Cloud-Base-20141203-21.x86_64.qcow2,if=virtio -net nic,model=virtio -net tap -localtime -spice port=5900,addr=192.168.3.148,disable-ticketing &

### kvm boot with kernel&initrd&append paras ###

kvm -m 758 -name f15 -kernel vmlinuz -initrd initrd.img -append "root=/dev/vda1" -drive file=~/fedora.qcow2,if=virtio -net nic,model=virtio,macaddr=00-11-22-33-55-44 -net tap -localtime

### arch kernel with ubuntu rootfs boot ###

kvm -m 758 -name f15 -kernel arch/vmlinuz-linux -initrd arch/test.img -append "root=/dev/vda1 rw" -drive file=~/ubuntu.qcow2,if=virtio -net nic,model=virtio,macaddr=aa-11-22-33-55-44 -net tap -localtime

### new for startup by hand ###

nohup qemu-system-x86_64 --enable-kvm -nographic -smp 4 -m 2048 -drive file=~/Fedora-Cloud-Base-20141203-21.x86_64.qcow2,if=virtio -net nic,model=virtio,macaddr=1a:46:0b:ca:bc:7b -net tap,script=/file &

### the good version of hand-by command ###

qemu-system-x86_64 --enable-kvm -cpu host -smp 2,sockets=1,cores=2,threads=1 -m 2048 -drive file=/mnt/glusterfs_volume/em_snap1.qcow2,if=virtio -net nic,vlan=1,model=virtio,macaddr=00:16:3e:f8:33:fe -net tap,script=/mnt/glusterfs_volume/kvm/qemu-ifup -vnc :1