Last week I was given an opportunity to give a lecture on our Linux course of Centralized Management taught by Tero Karvinen. I’m actually a student on this course so I was quite surprised when Tero asked me. This was the first time ever I’ve been asked to actually give a proper lecture to a class of more than 20 students so I was very honored and excited. Of course I’ve done many presentations in front of a class before but giving a full four hour lecture was something new.
The topic was a Python tool called Fabric and I was given free hands on how to do it. I do have some knowledge about Fabric as I was responsible for our Fabric configuration in our AwaseConfigurations project and I’m also using Fabric in my thesis which I’m working on right now. I had about a week to prepare for the lecture and it was plenty enough to get ready. I was a bit worried though as I’ve never even thought of lecturing like this and who knows if I’m any good.
And you know what? It couldn’t have gone any better. The students were paying attention and asking questions, listening to what I had to say. I had time to go through all of my material and I like to believe many learned the basics of Fabric quite well.
It was overall very nice experience and I’m happy I did it. The planning and the actual lecture also taught me to structure my thoughts in a way that it was easy to share the information and teach others. Big thanks to Tero for trusting me and giving me this opportunity!
I’ve gathered all the discussed material and a bit more to these two Fabric tutorials:
On the first turorial we learned to run commands on remote hosts with Fabric. Now we move on to
transfering files. Transfering new configuration files is usually quite important part of system administration.
Also retrieving log files from the remote machines might be useful.
Let’s assume we’ve made a new ssh_config file with important changes and we want to send it to our
remote hosts. Here’s a task for sending files.
def file_send(localpath,remotepath): put(localpath,remotepath,use_sudo=True)
Run it with:
or if the modified ssh_config is in the directory where you’re running Fabric:
If we’re sending the file to a location that doesn’t need sudo eg. /tmp/, we don’t need the use_sudo=True.
Another example: Read more of this post
This is a guide for installing and using Fabric on Ubuntu.
Fabric is a Python tool and a library for combining Python with SSH.
The tool can be used to execute Python functions from the command line. It’s also
possible to execute shell commands over SSH with Fabric and by combining the Python functions
with the SSH, it’s possible to automate system administration tasks. (fabfile.org)
You can use Fabric as a tool for centralized configuration management. You can run administrative tasks
on all of your machines simultaneously. Fabric is fast and easy to install and start using since there’s
no configuration needed, just install and start adding tasks to your fabfile.
Fabric doesn’t require anything else on the remote systems but a working SSH server. So if you
can control a device with SSH, you can also control it with Fabric. This is why Fabric is such
an easy and nice tool to add to your sysadmin tools. If you prefer Ruby over Python, take a look at a
similiar tool called Capistrano.
In these tutorials I will go through the installation and all the basics you need to start using
Fabric efficietly. Read more of this post
I’ve been told it’s good to start everything with a Hello World so here we go.
Hello World! This is awaseroot.
This is a new blog from the authors of the AwaseConfigurations project. This blog will be a place for us to post our findings and solutions to various Linux related topics. In our previous project we focused on centralized management and I believe we’ll be using and improving some of that material as well.
We will focus a lot on configuration management and system administration. The blog will contain a lot of tutorials, code/script examples and solutions to advanced as well as everyday linux use.