Author: P0L0

Blog, Development

Google +1 for Sharedaddy

Posted on by P0L0

Google published on 01 June the possibility to add Google +1 to your page, which is a great service to add to the existing sharing services.

Im using Sharedaddy, and I will not install another extra plugin to support Google +1 and the Sharedaddy option to add a custom service is not prepared for dynamic services like this one. That’s because I looked to integrate the service into Sharedaddy avoiding to change to much the plugin.

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Blog, Development, GNU/Linux, IT Security

ChiliProject 1.4.0 + Ruby Enterprise + Passenger + Apache2

Posted on by P0L0

I was a happy Trac user, but after seeing Redmine, I realized that Trac has many missing features and that you must do a lot of things with plugins, Redmine has this features out-of-box. After working a bit with Redmine I discovered ChiliProject, which is a fork of Redmine, and its actually compatible with Redmine Themes and Plugins.

Here is a comparison of Redmine/ChiliProject and Trac features:
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Blog, Development, Technology

Memcached – Pages/Chunks and Rebalancing

Posted on by P0L0

It’s important to know how Memcached organizes the available memory and how Objects are saved to understand “strange” effects.

Memcached has Pages that have a size of 1Mb (in newer version you can configure them from 1Mb to 128Mb), these Pages are divided in Chunks. The size of the Chunks is created dynamically after start, depending on the size of the Objects you are saving. Memcached tries to save a Object in a Chunk were the basted space is minimal (An 49Kb Object will be saved in an 50Kb Chunk)

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Blog, GNU/Linux, IT Security

Installing TRAC with mod_wsgi using virtualenv

Posted on by P0L0

This guide is for installing Trac as a user using virtualenv for a isolated Python environment so that the whole installation runs under a specific user.

First of all we need to install needed packages

apt-get install libapache2-mod-wsgi python-virtualenv python-setuptools

Once we have installed the required packages proceed to create the Python environment

mkdir /usr/local/trac
cd /usr/local/trac
virtualenv python

We now have the isolated Python environment locate under /usr/local/trac/python.

To make possible to use easy_install with repositories we need to upgrade easy_install. I use this to install Trac plugins directly from SVN.

/usr/local/trac/python/bin/easy_install -U trunk

We now can install trac 0.12 using the 0.12b1 SVN Tag (http://svn.edgewall.com/repos/trac/tags/trac-0.12b1 or Trac==0.12b1) or directly from SVN Trunk:

/usr/local/trac/python/bin/easy_install http://svn.edgewall.org/repos/trac/trunk

This will download and install the latest trunk version for Trac.

To have webaccess to the Trac projects, we need a .wsgi script, were we define where our local python environment is located:

# Not needed if mod_wsgi >= 3.0
import sys
sys.stdout = sys.stderr

# Load Trac
import trac.web.main
application = trac.web.main.dispatch_request

And finally we need to configure apache. If you want only one Trac project, you should define trac.env to the location of your trac, but if you want multiproject support, you must use trac.env_parent_dir (this is what I used)


    ServerName trac.dns.com

    DocumentRoot /usr/local/trac/htdocs
    ErrorLog /var/log/apache2/trac-error.log
    CustomLog /var/log/apache2/trac-access.log combined

    # Trac Auth
    
        AuthType Basic
        AuthName "Trac"
        AuthUserFile /usr/local/trac/.htpasswd
        Require valid-user
    < /location>

    #Trac
    #Define ProcessGroup with user and group under which it should run
    WSGIDaemonProcess trac user=trac group=trac python-path=/usr/local/trac/python/lib/python2.5/site-packages python-eggs=/usr/local/trac/python/cache
    WSGIScriptAlias / /usr/local/trac/htdocs/trac.wsgi

    
        WSGIProcessGroup trac
        WSGIApplicationGroup %{GLOBAL}
        SetEnv trac.env_parent_dir /usr/local/trac/projects

We need to create the user and change the permissions for /usr/local/trac for that user trac

adduser --home /usr/local/trac --shell /bin/false --no-create-home trac
chown -R trac:trac /usr/local/trac

If you get an error “ImportError: No module named simplejson” just install it using easy_install

/usr/local/trac/python/bin/easy_install simplejson
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