懒人的装法：
wget http://mirror.beyondhosting.net/OpenVSwitch/openvswitch-2.3.1-1.el6.x86_64.rpm
wget http://mirror.beyondhosting.net/OpenVSwitch/openvswitch-kmod-2.3.1-1.el6.x86_64.rpm
wget http://mirror.beyondhosting.net/OpenVSwitch/kmod-openvswitch-2.3.1-1.el6.x86_64.rpm
rpm -vih *.rpm
modprobe openvswitch
service openvswitch start
复杂的装法：
yum groupinstall "Development Tools" -y
yum install rpmdevtools openssl-devel kernel-devel gcc redhat-rpm-config -y
adduser ovswitch
su - ovswitch
cd
wget http://openvswitch.org/releases/openvswitch-2.3.1.tar.gz
tar xzf openvswitch-2.3.1.tar.gz
mkdir -p rpmbuild/SOURCES
cp openvswitch-2.3.1.tar.gz rpmbuild/SOURCES/
cp openvswitch-2.3.1/rhel/openvswitch-kmod.files /home/ovswitch/rpmbuild/SOURCES/
sed 's/openvswitch-kmod, //g' openvswitch-2.3.1/rhel/openvswitch.spec > openvswitch-2.3.1/rhel/openvswitch_no_kmod.spec
rpmbuild -bb openvswitch-2.3.1/rhel/openvswitch_no_kmod.spec
exit
yum localinstall rpmbuild/RPMS/x86_64/openvswitch-2.3.1.x86_64.rpm
modprobe openvswitch
service openvswitch start