Mininet 源代码包中的 install.sh脚本不支持 RHEL/CentOS，要手动解决一些列的琐碎问题，很麻烦。下面的方法用用于在 CentOS 6 中快速安装 Mininet 和 openvswitch 搭建SDN测试环境。

CentOS 版本为 6.3 64bit

1. 安装 Mininet

创建软件仓库配置文件： /etc/yum.repos.d/naulinux-extras.repo :

[naulinux-extras]
name=NauLinux Extras
baseurl=http://downloads.naulinux.ru/pub/NauLinux/6.2/$basearch/Extras/RPMS/
enabled=0
gpgcheck=1
gpgkey=http://downloads.naulinux.ru/pub/NauLinux/RPM-GPG-KEY-linux-ink

使用如下的命令安装 mininet :

# yum --enablerepo=naulinux-extras install mininet

提示找不到软件包，于是乎到 http://downloads.naulinux.ru/pub/NauLinux/6.2/SRPMS/NauLinux/ 看了一下，mininet软件包确实不在了。

于是参考 https://github.com/mininet/mininet/wiki/Mininet-Community-Extensions-and-Packages 发现 Mininet 的 RPM 包在 6.3 中按照项目名称进行了归类：

http://downloads.naulinux.ru/pub/NauLinux/6.3/x86_64/Extras/RPMS/Projects/OpenFlow/

OK,那就修改 repository 配置文件吧。

[naulinux-extras]
name=NauLinux Extras
baseurl=http://downloads.naulinux.ru/pub/NauLinux/6.3/$basearch/Extras/RPMS/
enabled=0
gpgcheck=1
gpgkey=http://downloads.naulinux.ru/pub/NauLinux/RPM-GPG-KEY-linux-ink

再次运行命令安装 mininet :

# yum --enablerepo=naulinux-extras install mininet

问题又来了，提示：

Package mininet-2.1.0-3.el6.x86_64.rpm is not signed

提示：没签名。那就不验证签名吧，使用如下命令安装：

yum --enablerepo=naulinux-extras --nogpgcheck install mininet

It’s OK! Yeah! ：）

2.安装 openvswitch

细心的你应该会发现，http://downloads.naulinux.ru/pub/NauLinux/6.3/x86_64/Extras/RPMS/Projects/OpenFlow/ 下面也有 openvswitch 1.4.3 ，版本虽然有点老，it’s OK！

再次运行命令安装 mininet :

# yum --enablerepo=naulinux-extras install openvswitch
install openvswitch
Loaded plugins: aliases, changelog, downloadonly, fastestmirror, kabi, presto, security, tmprepo, verify, versionlock
Loading support for CentOS kernel ABI
Loading mirror speeds from cached hostfile
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package openvswitch.x86_64 0:1.4.3-2.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===================================================================================================================================
 Package                        Arch                      Version                         Repository                          Size
===================================================================================================================================
Installing:
 openvswitch                    x86_64                    1.4.3-2.el6                     naulinux-extras                    1.6 M

Transaction Summary
===================================================================================================================================
Install       1 Package(s)

Total download size: 1.6 M
Installed size: 5.1 M
Is this ok [y/N]: y
Downloading Packages:
Setting up and reading Presto delta metadata
Processing delta metadata
Package(s) data still to download: 1.6 M
openvswitch-1.4.3-2.el6.x86_64.rpm                                                                          | 1.6 MB     00:04     
warning: rpmts_HdrFromFdno: Header V4 DSA/SHA1 Signature, key ID fac8d3c0: NOKEY
Retrieving key from http://downloads.naulinux.ru/pub/NauLinux/RPM-GPG-KEY-linux-ink
Importing GPG key 0xFAC8D3C0:
 Userid: "Developer (Linux Ink. developers team) <devel@linux-ink.ru>"
 From  : http://downloads.naulinux.ru/pub/NauLinux/RPM-GPG-KEY-linux-ink
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : openvswitch-1.4.3-2.el6.x86_64                                                                                  1/1 
  Verifying  : openvswitch-1.4.3-2.el6.x86_64                                                                                  1/1 

Installed:
  openvswitch.x86_64 0:1.4.3-2.el6                                                                                                 

Complete!

3. 测试 Mininet + openvswitch 工作是否正常

用最简单的方法，在命令行直接运行 mn 命令，提示出错：

[root@localhost ~]# mn
*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2 
*** Adding switches:
May 18 10:05:20|00001|stream_unix|ERR|/tmp/stream-unix.26105.0: connection to /var/run/openvswitch/db.sock failed: No such file or directory
May 18 10:05:20|00002|reconnect|WARN|unix:/var/run/openvswitch/db.sock: connection attempt failed (No such file or directory)
May 18 10:05:21|00003|stream_unix|ERR|/tmp/stream-unix.26105.1: connection to /var/run/openvswitch/db.sock failed: No such file or directory
May 18 10:05:21|00004|reconnect|WARN|unix:/var/run/openvswitch/db.sock: connection attempt failed (No such file or directory)
ovs-vsctl exited with code -14
*** Error connecting to ovs-db with ovs-vsctl
Make sure that Open vSwitch is installed, that ovsdb-server is running, and that
"ovs-vsctl show" works correctly.
You may wish to try "service openvswitch-switch start".

要启动 openvswitch 服务：

# service openvswitch start

启动出错。

于是乎，卸载这个版本的 openvswitch

# rpm -e openswitch

4. 安装openvswitch最新版2.3.1

从 http://www.openswitch.org 下载最新的tar包，按照https://github.com/openvswitch/ovs/blob/master/INSTALL.RHEL.md 从源码编译 RPM 包。过程如下：

# cd
# yum install gcc make python-devel openssl-devel kernel-devel graphviz \
kernel-debug-devel autoconf automake rpm-build redhat-rpm-config libtool
# wget http://openvswitch.org/releases/openvswitch-2.3.1.tar.gz
# mkdir $HOME/rpmbuild/SOURCES
# cp openvswitch-2.3.1.tar.gz $HOME/rpmbuild/SOURCES
# cd
# tar zxvf openvswitch-2.3.1.tar.gz
# cd openvswitch-x.y.z
# rpmbuild -bb rhel/openvswitch.spec
# cp openvswitch-2.3.1/rhel/openvswitch-kmod.files $/HOME/rpmbuild/SOURCES
# rpmbuild -bb rhel/openvswitch-kmod-rhel6.spec

进入生成 RPM 的目录，yum localinstall * :

# pwd
/root/rpmbuild/RPMS/x86_64
# ls
kmod-openvswitch-2.3.1-1.el6.x86_64.rpm  openvswitch-2.3.1-1.x86_64.rpm  openvswitch-debuginfo-2.3.1-1.x86_64.rpm
# yum localinstall *

启动 openvswitch 服务，提示：

Inserting openvswitch module FATAL: Module openvswitch not found.

重启系统，openvswitch 已经设置为自动启动了，All OK! Yeah!

# service openvswitch status
ovsdb-server is running with pid 2740
ovs-vswitchd is running with pid 2751
# ovs-vsctl show
bfc56466-07ff-454a-9a31-7e293edd2369
ovs_version: "2.3.1"

5. 再次测试

首先启动 POX 控制器：

# ./pox.py log.level --DEBUG forwarding.l2_learning

启动 Mininet ：

# mn --controller remote
*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2 
*** Adding switches:
s1 
*** Adding links:
(h1, s1) (h2, s1) 
*** Configuring hosts
h1 h2 
*** Starting controller
*** Starting 1 switches
s1 
*** Starting CLI:
mininet> h1 ping h2
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=49.4 ms
^C
--- 10.0.0.2 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 861ms
rtt min/avg/max/mdev = 49.400/49.400/49.400/0.000 ms
mininet> 

总算是大功告成了，使用其它的控制器应该都没什么问题！

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