Installing Mininet|MININET




Installing Mininet

Mininet runs only under the Linux operating system. Windows and Mac users can, however, easily run Mininet in a single Linux virtual machine. Even Linux users may wish to do this, as running Mininet has a nontrivial potential to affect normal operation (a virtual-switch process started by Mininet has, for example, interfered with the suspend feature on the author’s laptop).

The Mininet group maintains a virtual machine with a current Mininet installation at their downloads site. The download file is actually a .zip file, which unzips to a modest .ovf file defining the specifications of the virtual machine and a much larger (~2 GB) .vmdk file representing the virtual disk image. (Older unzip versions may have trouble with unzipping very large files; if that happens, search online for an alternative unzipper.)

There are several choices for virtual-machine software; two options that are well supported and free (as of 2017) for personal use are VirtualBox and VMware Workstation Player. The .ovf file should open in either (in VirtualBox with the “import appliance” option). However, it may be easier simply to create a new Linux virtual machine and specify that it is to use an existing virtual disk; then select the downloaded .vmdk file as that disk.

Both the login name and the password for the virtual machine is “mininet”. Once logged in, the sudo command can be used to obtain root privileges, which are needed to run Mininet. It is safest to do this on a command-by-command basis; eg sudo python switchline.py. It is also possible to keep a terminal window open that is permanently logged in as root, eg via sudo bash.

Another option is to set up a Linux virtual machine from scratch (eg via the Ubuntu distribution) and then install Mininet on it, although the preinstalled version also comes with other useful software, such as the Pox controller for OpenFlow switches.

An Introduction to Computer Networks, Release 2.0.4

The preinstalled version does not, however, come with any graphical-interface desktop. One can install the full Ubuntu desktop with the command (as root) apt-get install ubuntu-desktop. This will, however, add more than 4 GB to the virtual disk. A lighter-weight option, recommended by the Mininet site, is to install the alternative desktop environment lxde; it is half the size of Ubuntu. Install it with

apt-get install xinit lxde

 

The standard graphical text editor included with lxde is leafpad, though of course others (eg gedit or emacs) can be installed as well.

After desktop installation, the command startx will be necessary after login to start the graphical environment (though one can automate this). A standard recommendation for new Debian-based Linux systems, before installing anything else, is

apt-get update

apt-get upgrade

 

Most virtual-machine software offers a special package to improve compatibility with the host system. One of the most annoying incompatibilities is the tendency of the virtual machine to grab the mouse and not allow it to be dragged outside the virtual-machine window. (Usually a special keypress releases the mouse; on VirtualBox it is by default the right-hand Control key and on VMWare Player it is Control-Alt.) Installation of the compatibility package (in VirtualBox called Guest Additions) usually requires mounting a CD image, with the command

mount /dev/cdrom /media/cdrom

The Mininet installation itself can be upgraded as follows:

cd /home/mininet/mininet
git fetch git checkout master          # Or a specific version like 2.2.1
git pull make install

The simplest environment for beginners is to install a graphical desktop (eg lxde) and then work within it. This allows seamless opening of xterm and WireShark as necessary. Enabling copy/paste between the virtual system and the host is also convenient.

However, it is also possible to work entirely without the desktop, by using multiple ssh logins with Xwindows forwarding enabled:

ssh -X -l username mininet

This does require an X-server on the host system, but these are available even for Windows (see, for example, Cygwin/X). At this point one can open a graphical program on the ssh command line, eg wireshark & or gedit mininet-demo.py &, and have the program window display properly (or close to properly).

Finally, it is possible to access the Mininet virtual machine solely via ssh terminal sessions, without Xwindows, though one then cannot launch xterm or WireShark.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



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