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===Running vm on KVM===
First I convert my virtualbox disk image to qcow2.
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VBoxManage clonehd --format RAW w7.vdi w7.raw
qemu-img convert -f raw w7.raw -O qcow2 w7.qcow2
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Then follow the official doc to install kvm and create my first kvmvm
https://help.ubuntu.com/community/KVM

====Create disk image in qed format====
qed is supposed to be faster. To create, run the following
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qemu-img create -fqed cent6.qed 12G
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===Bridge Networking===
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aptitude install qemu libcap2-bin bridge-utils
setcap cap_net_admin=ei /usr/bin/qemu-system-x86_64
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/etc/security/capability.conf
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cap_net_admin MY-USER-NAME
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Stop networking
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invoke-rc.d networking stop
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Edit /etc/network/interfaces
Replace the name of primary interface with br0, then create it back with the following (assuming it's eth0)
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auto br0
iface br0 inet static
address 192.168.x.1
network 192.168.x.0
netmask 255.255.255.0
broadcast 192.168.x.255
gateway 192.168.x.254
bridge_ports eth0
bridge_stp off
bridge_fd 0
bridge_maxwait 0
auto eth0
iface eth0 inet manual
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And then restart networking
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/etc/init.d/networking restart
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