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<!DOCTYPE html>
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<title>Full Stack Python: Operating Systems</title>
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<h1>Operating Systems</h1>
<p>An operating system runs on the server or virtual server and controls access
to computing resources. The operating system also includes a way to install
programs necessary for running your Python web application.</p>
<h2>Why are operating systems necessary?</h2>
<p>An operating system makes many the computing tasks we take for granted easy.
For example, the operating system enables writing to files,
communicating over a network and running multiple programs at once.
Otherwise you'd need to control the CPU, memory, network, graphics card,
and many other components with your own low-level implemention.</p>
<p>Without using an existing operating system like Linux, Mac OS X, or Windows,
you'd be forced to write a new operating system as part of your web
application. It would be impossible to write features for your Python
web application because you'd be too busy hunting down a memory leak in
your assembly code, if you even were able to get that far.</p>
<p>Fortunately, the open source community provides Linux to the Python world
as a rock solid free operating system for running our applications.</p>
<h2>Recommended operating systems</h2>
<p>The only recommended operating system for production Python web stack
deployments is Linux. There are several Linux distributions commonly used
for running production servers. Ubuntu Long Term Support (LTS) releases,
Red Hat Enterprise Linux, and CentOS are all viable options. </p>
<p>Mac OS X is fine for development activities. Windows and Mac
OS X are not appropriate for production deployments unless there is a
major reason why you must use them in lieu of Linux.</p>
<h3>Ubuntu</h3>
<p>Ubuntu is a Linux distribution packaged by the
<a href="http://www.canonical.com/">Canonical Ltd</a> company. Ubuntu uses the
Debian distribution as a base for packages, including the
<a href="http://wiki.debian.org/Apt">aptitude package manager</a>. For desktop versions
of Ubuntu, GNOME (until the 11.04 release) or Unity (11.10 through current)
is bundled with the distribution to provide a user interface.</p>
<p>Ubuntu <a href="https://wiki.ubuntu.com/LTS">Long Term Support</a> (LTS) releases
are the recommended versions to use for deployments. LTS versions receive
five years of post-release updates from Canonical. Every two years, Canonical
creates a new LTS release, which allows for an easy upgrade path as well
as flexibility in skipping every other LTS release if necessary. As of
February 2014,
<a href="http://releases.ubuntu.com/precise/">12.04 Precise Pangolin</a>
is the latest Ubuntu LTS release.</p>
<h4>Ubuntu Python Packages</h4>
<p>There are several
<a href="https://help.ubuntu.com/12.04/serverguide/aptitude.html">Aptitude</a>
packages found on Linux servers running a Python stack. These packages are: </p>
<ul>
<li>
<p><a href="http://packages.ubuntu.com/precise/python-dev">python-dev</a> for header
files and static library for Python</p>
</li>
<li>
<p><a href="http://packages.ubuntu.com/precise/python-virtualenv">python-virtualenv</a>
for creating and managing Python
<a href="http://www.virtualenv.org/en/latest/">virtualenvs</a> to isolate library
dependencies</p>
</li>
</ul>
<h3>Red Hat and CentOS</h3>
<p><a href="http://www.redhat.com/products/enterprise-linux/">Red Hat Enterprise Linux</a>
(RHEL) and <a href="http://www.centos.org/">Community ENTerprise Operating System</a>
(CentOS) are the same distribution. The primary difference between the two
is that CentOS is an open source, liberally licensed free derivative of RHEL.</p>
<p>RHEL and CentOS use a different package manager and command-line interface
from Debian-based Linux distributions: RPM Package Manager (RPM) and the
Yellowdog Updater, Modified (YUM). RPM has a specific .rpm file format
to handle the packaging and installation of libraries and applications. YUM
provides a command-line interface for interacting with the RPM system.</p>
<h2>Operating System Resources</h2>
<ul>
<li>
<p><a href="http://www.linux.org/threads/selecting-a-linux-distribution.4087/">What is a Linux distribution and how do I choose the right one?</a></p>
</li>
<li>
<p>Lifehacker's <a href="http://lifehacker.com/5889950/how-to-find-the-perfect-linux-distribution-for-you">guide to choosing a Linux distro</a>.</p>
</li>
<li>
<p><a href="http://www.rackspace.com/knowledge_center/article/choosing-a-linux-distribution">Choosing a Linux Distribution</a></p>
</li>
<li>
<p><a href="http://plusbryan.com/my-first-5-minutes-on-a-server-or-essential-security-for-linux-servers">First 5 Minutes on a Server</a></p>
</li>
</ul>
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Next read the
<a href="/web-servers.html">web servers</a> section.
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<a href="/introduction.html" class="list-group-item ">Introduction</a>
<a href="/servers.html" class="list-group-item ">Servers</a>
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<a href="/best-python-resources.html" class="list-group-item ">Best Python Resources</a>
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