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Merge pull request #296 from tommy3001/master · puregit/python-guide@a59c581 · GitHub

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forked from realpython/python-guide

Commit a59c581

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Kenneth Reitz
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Merge pull request realpython#296 from tommy3001/master
Psutil system resources library added to scenarios/admin
2 parents 327099a + 32a14b7 commit a59c581

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‎docs/scenarios/admin.rst‎

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@@ -120,6 +120,60 @@ State files can be written using YAML, the Jinja2 template system or pure python
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`Salt Documentation <http://docs.saltstack.org/en/latest/index.html>`_
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Psutil
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------
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`Psutil <https://code.google.com/p/psutil/>`_ is an interface to different system information (e.g. CPU, memory, disks, network, users and processes).
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Here is an example to be aware of some server overload. In case of some failed test (net, CPU) it send an email.
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.. code-block:: python
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# Functions to get system values:
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from psutil import cpu_percent, net_io_counters
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# Functions to take a break:
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from time import sleep
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# Package for email services:
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import smtplib
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import string
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MAX_NET_USAGE = 400000
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MAX_ATTACKS = 4
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attack = 0
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counter = 0
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while attack <= MAX_ATTACKS:
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sleep(4)
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counter = counter + 1
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# Check the cpu usage
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if cpu_percent(interval = 1) > 70:
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attack = attack + 1
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# Check the net usage
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neti1 = net_io_counters()[1]
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neto1 = net_io_counters()[0]
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sleep(1)
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neti2 = net_io_counters()[1]
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neto2 = net_io_counters()[0]
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# Calculate the bytes per second
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net = ((neti2+neto2) - (neti1+neto1))/2
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if net > MAX_NET_USAGE:
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attack = attack + 1
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if counter > 25:
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attack = 0
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counter = 0
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# Write a very important email if attack is higher then 4
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TO = "you@your_email.com"
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FROM = "webmaster@your_domain.com"
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SUBJECT = "Your domain is out of system resources!"
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text = "Go and fix your server!"
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BODY = string.join(("From: %s" %FROM,"To: %s" %TO,"Subject: %s" %SUBJECT, "",text), "\r\n")
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server = smtplib.SMTP('127.0.0.1')
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server.sendmail(FROM, [TO], BODY)
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server.quit()
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A full terminal application like a widely extended top which is based on psutil and with the ability of a client-server
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monitoring is `glance <https://github.com/nicolargo/glances/>`_.
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Chef
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----
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‎docs/scenarios/imaging.rst‎

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----------------------
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The `Python Imaging Library <http://www.pythonware.com/products/pil/>`_, or PIL
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for short, is *the* library for image manipulation in Python.
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for short, is *the* library for image manipulation in Python. Unfortunately, its
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development has stagnated, with its last release in 2009.
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It works with Python 1.5.2 and above, including 2.5, 2.6 and 2.7. Unfortunately,
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it doesn't work with 3.0+ yet.
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Lucky for you, there's an actively-developed fork of PIL called `Pillow <http://python-imaging.github.io/>`_ -
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it's easier to install, runs on all operating systems, and supports Python 3.
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Installation
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~~~~~~~~~~~~
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PIL has a reputation of not being very straightforward to install. Listed below
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are installation notes on various systems.
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Before installing Pillow, you'll have to install Pillow's prerequisites. Find
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the instructions for your platform `here <https://pypi.python.org/pypi/Pillow/2.1.0#platform-specific-instructions>`_.
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Also, there's a fork named `Pillow <http://pypi.python.org/pypi/Pillow>`_ which is easier
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to install. It has good setup instructions for all platforms.
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Installing on Linux
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~~~~~~~~~~~~~~~~~~~
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Arch Linux
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``````````
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PIL is maintained in the official community repository, and installed with the system installer as:
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.. code-block:: bash
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$ sudo pacman -S python2-imaging
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Ubuntu 12.10
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````````````
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Can be installed on the command line as:
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.. code-block:: bash
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$ sudo apt-get install python-imaging
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Installing on Mac OS X
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~~~~~~~~~~~~~~~~~~~~~~
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PIP doesn't know about the Mac OS X Freetype paths. To rectify that:
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.. code-block:: bash
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$ ln -s /usr/X11/include/freetype2 /usr/local/include/
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$ ln -s /usr/X11/include/ft2build.h /usr/local/include/
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$ ln -s /usr/X11/lib/libfreetype.6.dylib /usr/local/lib/
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$ ln -s /usr/X11/lib/libfreetype.6.dylib /usr/local/lib/libfreetype.dylib
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then:
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After that, it's straightforward:
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.. code-block:: bash
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$ brew install libjpeg
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$ pip install PIL
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Installing on Windows
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~~~~~~~~~~~~~~~~~~~~~
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.. todo::
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Notes on installing on Windows machines
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$ pip install Pillow

‎docs/scenarios/web.rst‎

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import tornado.ioloop
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import tornado.web
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# Load tamplate file templates/site.html
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# Load template file templates/site.html
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TEMPLATE_FILE = "site.html"
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templateLoader = FileSystemLoader( searchpath="templates/" )
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templateEnv = Environment( loader=templateLoader )

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