环境：
os: centos7
ovs: openvswitch-2.17.4

1. Preparing

1.1 下载 openvswitch-2.17.4.tar.gz，并解压到/root/openvswitch-2.17.4

1.2 安装gcc
yum install -y gcc

1.3 安装python3
yum install -y python3

2. Configuring

进入到解压后的openvswitch-2.17.4目录下，执行./configure

3. Building

3.1. openvswitch-2.17.4目录下继续执行make (Run GNU make in the build directory)

3.2. openvswitch-2.17.4目录下继续执行make install (Run make install to install the executables and manpages into the running system, by default under /usr/local)

4. Starting

安装完成后，可以利用ovs-ctl工具直接拉起ovsdb-server和ovs-vswitchd，ovs-ctl工具默认安装在/usr/local/share/openvswitch/scripts目录下

依次执行如下两个命令

export PATH=$PATH:/usr/local/share/openvswitch/scripts
ovs-ctl start

5. Validating

执行ovs-vsctl show 可以查看到对应的版本号