What is Open vSwitch?
Open vSwitch is a production quality, multilayer virtual switch licensed under the open source Apache 2.0 license. It is designed to enable massive network automation through programmatic extension, while still supporting standard management interfaces and protocols (e.g. NetFlow, sFlow, IPFIX, RSPAN, CLI, LACP, 802.1ag). In addition, it is designed to support distribution across multiple physical servers similar to VMware's vNetwork distributed vswitch or Cisco's Nexus 1000V. See full feature list here
1.安裝依賴軟件包，及創建普通用戶ovs。
yum -y install wget gcc make python-devel openssl-devel kernel-devel graphviz kernel-debug-devel autoconf automake rpm-build redhat-rpm-config libtool
adduser ovs
su - ovs
2.下載源碼包，並創建rpm包。
mkdir -p ~/rpmbuild/SOURCES
wget http://openvswitch.org/releases/openvswitch-2.3.2.tar.gz
cp openvswitch-2.3.2.tar.gz ~/rpmbuild/SOURCES/
tar xfz openvswitch-2.3.2.tar.gz
sed 's/openvswitch-kmod, //g' openvswitch-2.3.2/rhel/openvswitch.spec > openvswitch-2.3.2/rhel/openvswitch_no_kmod.spec
rpmbuild -bb --nocheck openvswitch-2.3.2/rhel/openvswitch_no_kmod.spec
exit
3.創建ovs配置目錄，並安裝制作好的rpm包。
mkdir /etc/openvswitch
yum localinstall /home/ovs/rpmbuild/RPMS/x86_64/openvswitch-2.3.2-1.x86_64.rpm
4.如果selinux開啟，請執行如下操作，如未開啟，請略過此步驟。
yum install policycoreutils-python
semanage fcontext -a -t openvswitch_rw_t "/etc/openvswitch(/.*)?"
restorecon -Rv /etc/openvswitch
5.啟動服務，並查看ovs版本信息。
chkconfig openvswitch on
systemctl restart openvswitch.service
ovs-vsctl -V
參考文檔：
博客：https://n40lab.wordpress.com/2015/06/28/centos-7-installing-openvswitch-2-3-2-lts/
官方文檔：http://openvswitch.org/