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Month: January 2015

List of Graduate Networking Readings

Published by castroflaviojr on January 9, 2015

This is a list I want to keep for myself and share with others. Soon I’ll make a compilation of interesting readings on networking on a different post.

Graduate level networking courses don’t usually have textbook, normally come with long reading lists.

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Easiest way to install OpenVswitch and Mininet on Ubuntu 12.04

Published by castroflaviojr on January 1, 2015

I’ve been struggling trying to set up the OVS 2.0 with Mininet 2.2 on Ubuntu 12.04.

Apparently the installation script from Mininet is not fully working on Ubuntu 12.04.

What did I do to fix it?

The easiest way to install it is to use the Mininet installation script and then do a small fix.

I did this exactly to install:

sudo apt-get update
sudo apt-get install -y git
git clone git://github.com/mininet/mininet
cd mininet
git checkout -b 2.2.0 2.2.0
util/install.sh -nf
util/install.sh -V 2.3.0

After this you will some weird errors. It should look like this:

Setting up openvswitch-switch (2.3.0-1) ...
 * Inserting openvswitch module
 * /etc/openvswitch/conf.db does not exist
 * Creating empty database /etc/openvswitch/conf.db
 * Starting ovsdb-server
2015-01-02T00:57:50Z|00002|stream_unix|WARN|/usr/local/var/run/openvswitch/db.sock: connection failed (No such file or directory)
2015-01-02T00:57:50Z|00003|reconnect|WARN|unix:/usr/local/var/run/openvswitch/db.sock: connection attempt failed (No such file or directory)
2015-01-02T00:57:51Z|00004|stream_unix|WARN|/usr/local/var/run/openvswitch/db.sock: connection failed (No such file or directory)

You should interrupt the script now with ctrl+C. Next do this:

cd ~/openvswitch/openvswitch-2.3.0/
sudo -s
ovsdb-tool create /usr/local/etc/openvswitch/conf.db vswitchd/vswitch.ovsschema
ovsdb-server -v --remote=punix:/usr/local/var/run/openvswitch/db.sock \
--remote=db:Open_vSwitch,Open_vSwitch,manager_options \
--private-key=db:Open_vSwitch,SSL,private_key \
--certificate=db:Open_vSwitch,SSL,certificate \
--pidfile --detach --log-file
ovs-vsctl --no-wait init
ovs-vswitchd --pidfile --detach
ovs-vsctl show

This partially solves the problem. Let’s go ahead and test it: sudo mn --test pingall.

If you reboot you are going to have the same error. What you can do is to run this everytime you reboot: 

cd ~/openvswitch/openvswitch-2.3.0/
sudo -s
ovsdb-tool convert /usr/local/etc/openvswitch/conf.db vswitchd/vswitch.ovsschema
ovsdb-server -v --remote=punix:/usr/local/var/run/openvswitch/db.sock \
--remote=db:Open_vSwitch,Open_vSwitch,manager_options \
--private-key=db:Open_vSwitch,SSL,private_key \
--certificate=db:Open_vSwitch,SSL,certificate \
--pidfile --detach --log-file
ovs-vsctl --no-wait init
ovs-vswitchd --pidfile --detach
ovs-vsctl show

If you find a best solution or this does not work for you, please report me your issue. I will do my best to help you!

Regards,

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