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  • Rails 3.1.0

    Posted on {31-Aug-2011} Frank Vielma No comments

    Recently, the rails 3.1.0 is now a release version.

    It is recommendable to use rvm (you need to install rvm) creating a new gemset so, we can isolate the install from the rest of our environments. We need the follow steps:

    • Creating a gemset:
      rvm --create 1.9.2-p180@rails31
    • Installing the last rails version (3.1.0) :
    • gem install rails
    • To generate a new project:
    • rails new project31
    • Adding the following lines to the Gemfile file
    • gem 'execjs'
      gem 'therubyracer'

      ExecJS. Run JavaScript code from Ruby.
      therubyracer. Embed the V8 Javascript Interpreter into Ruby.

    • Running bundle:
    • bundle install
    • Starting the new rails application:
    • rails s

    After it, we would see the following lines:

    => Booting WEBrick
    => Rails 3.1.0 application starting in development on
    => Call with -d to detach
    => Ctrl-C to shutdown server
    [2011-08-31 09:39:29] INFO  WEBrick 1.3.1
    [2011-08-31 09:39:29] INFO  ruby 1.9.2 (2011-02-18) [i686-linux]
    [2011-08-31 09:39:29] INFO  WEBrick::HTTPServer#start: pid=11130 port=3000

    Release notes
    Rails 3.1 sources

  • Installing MongoDB and php driver in Ubuntu 10.10

    Posted on {10-May-2011} Frank Vielma No comments

    MongoDB is a NoSQL (“not only sql”), a non-relational, distributed, open-source, horizontal scalable and document-oriented database written in the C++. It doesn’t have transactions, ACID compliance, joins, foreign keys, or many of the other features belonging to relational database management system (RDBMS). The database is document-oriented so it manages collections of JSON-like documents.

    One of the most important feature is than MongoDB scaling very well.


    • Step 1. Adding the ubuntu repository:
      sudo apt-key adv --keyserver --recv 7F0CEB10

      add at the end of the /etc/apt/sources.list file:

      deb dist 10gen
    • Step 2. Installing mongodb
       sudo aptitude update && sudo aptitude install mongodb-10gen
    • Step 3. Verifying installation:
      mongo --version
      MongoDB shell version: 1.8.1
    • Step 3. Now, we will installing the PHP driver:
      sudo aptitude install php5-dev php5-cli php-pear && sudo pecl install mongo

      add the dynamic library at the end of the php.ini (/etc/php5/apache2/php.ini) file:
    • Step 4. Restart apache and verify if all is ok running the phpinfo() function:
      sudo /etc/init.d/apache2 restart


    More info

  • How to convert DBF to CSV (ubuntu, debian)

    Posted on {03-May-2011} Frank Vielma No comments

    There is a perl tool (dbf_dump) that allows to convert dbf files (dBase) to csv (comma-separated values). To install it, we must to install libdbd-xbase-perl:

    sudo aptitude install libdbd-xbase-perl


    dbf_dump --fs=","  file.dbf > file.csv
  • Installing RVM on Ubuntu maverick

    Posted on {29-Apr-2011} Frank Vielma No comments

    In first place, what is RVM ?
    RVM is the Ruby Version Manager. It makes installing and managing several different versions and implementations of Ruby on one computer.

    There are two ways to install and configure RVM.

    • As a standard user
    • As root

    In this post we will do the first one.

    In first time, you will need to install zlib and others.

    Debian/Ubuntu systems:

    sudo apt-get install zlib1g-dev zlib1g libssl-dev libreadline5-dev libxml2-dev libsqlite3-dev
    • Step 1. Download and install rvm from sources. It will install in $HOME/.rvm. (You must have installed curl and git)
      bash < <(curl -s
    • Step 2. Now, we will complete the install by loading RVM in new shells adding the following line in a $HOME/.bashrc file.
      [[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
    • Step 3.Open a new shell or run:
      source $HOME/.bashrc
    • Step 4.Test if the RVM’s installation is working.
      type rvm | head -1

      and you should get:

      rvm is a function

    Now, assuming that all is working, we could install ruby 1.9.2 as following:

    rvm install 1.9.2

    We can use ruby 1.9.2 in our system running only:

    rvm use 1.9.2

    so, we can verify what ruby’s version is running right now:

    which ruby

    you get:


    But, if we want to return to the initial conditions ? No problem, you need only to run:

    rvm system

    it will return to the ruby’s system (ruby 1.8.7 (2010-06-23 patchlevel 299) [i686-linux])

  • Installing Firefox 4 on Debian 6 (Squeeze), Ubuntu 10.04 and 10.10

    Posted on {24-Mar-2011} Frank Vielma No comments

    Firefox 4 is a very important release from Mozilla guys. This version include improvements in performance, standards support, and the user interface.

    Firefox 4

    The simple way to install Firefox 4 on Ubuntu is:

    sudo add-apt-repository ppa:mozillateam/firefox-stable
    sudo aptitude update && sudo apt-get upgrade

    On Debian:

    sudo tar -xvjf firefox-4.0.tar.bz2 -C /usr/local
    sudo ln -s /usr/local/firefox/firefox /usr/local/bin/firefox4

    The steps to add firefox4 to the gnome panel are: Right button over panel -> Add to Panel… -> Custom Application Luncher -> Add -> Fill fields -> Choose an Icon (path to firefox4’s icons /usr/local/firefox/icons/).


  • Installing Geonode in a debian lenny platform

    Posted on {17-Mar-2011} Frank Vielma No comments

    GeoNode is an open source platform that facilitates the creation, sharing, and collaborative use of geospatial data.

    • Step 1. In first time, you need to install and purge some packages:
       sudo aptitude install git-arch subversion libgeos-dev gdal-bin g++ make ant zlib-bin zlib1g-dev libreadline5-dev tcl8.5-dev tk8.5-dev libssl-dev libsqlite3-dev libbz2-dev libgdbm-dev
       sudo aptitude purge gij-4.3 bsh bsh-gcj java-gcj-compat java-gcj-compat-headless libbcel-java libhsqldb-java libhsqldb-java-gcj libjaxp1.3-java libjaxp1.3-java-gcj libjline-java liblog4j1.2-java libmx4j-java libregexp-java libservlet2.4-java libxalan2-java libxalan2-java-gcj libxerces2-java libxerces2-java-gcj
    • Step 2. Install sun-java. You need modfy /etc/apt/sources.list and add non-free to the Debian Lenny repositories:
      deb lenny/volatile main
      deb-src lenny/volatile main
      deb lenny main non-free
      deb lenny/updates main non-free

      and run:

      sudo aptitude update
      sudo aptitude install sun-java6-jdk
    • Step 3. Download, compile and install python 2.6.
      tar -xvjf Python-2.6.6.tar.bz2
      cd Python-2.6.6
      ./configure --with-threads --enable-shared
      make -j 2
      sudo make install
      sudo ln -s /usr/include/ /usr/lib/
      sudo ln -s /usr/include/ /usr

      To run python -V and you would get:
      Python 2.6.6

    • Step 4. Download, compile and install maven
      sudo tar -xvzf apache-maven-2.2.1-bin.tar.gz -C /usr/local/

      Add at the end of ~/.bashrc file

      export PATH=$PATH:/usr/local/apache-maven-2.2.1/bin/
      export JAVA_HOME=/usr

      and run:

      source ~/.bashrc

      so, you would to get when run mvn -v:

      Apache Maven 2.2.1 (r801777; 2009-08-06 14:46:01-0430)
      Java version: 1.6.0_22
      Java home: /usr/lib/jvm/java-6-sun-
      Default locale: en_US, platform encoding: UTF-8
      OS name: "linux" version: "2.6.26-2-686" arch: "i386" Family: "unix"
    • Step 5. Installing geonode. The first thing is clone the repository:
      git clone git:// geonode


      cd geonode
      git submodule update --init
      python --no-site-packages
      source bin/activate
      paver build createsuperuser --settings=geonode.settings
      paver host

    Development GeoNode should be running at http://localhost:8000/

  • Installing a VM (Virtual machine) with VirtualBox

    Posted on {16-Mar-2011} Frank Vielma No comments

    VirtualBox is a cross-platform virtualization application. In this post, we will use it in a Ubuntu (maverick) platform (host OS) and we will install Debian as a guest virtual OS in a following post. At first, you must to download it from:

    • Step 1. As an user with the necessary privileges to install packages (root or sudo user), run:
      sudo dpkg -i virtualbox-4.0_4.0.4-70112~Ubuntu~maverick_i386.deb

      VirtualBox will be installed in the Applications -> System Tools -> Oracle VM VirtualBox.

    • Step 2. Now, you need to run the Oracle VM VirtualBox and to create a new virtual machine (VM) doing click in the New button or Ctrl-N
      VirtualBox's buttons
    • Step 3. Click in the Next button:
      Wizard window
    • Step 4. To choice a VM name and OS type. We choice: Name: debian_test, Operating System: Linux, Version: Debian.
      VM Name and OS Type
    • Step 5. To select the amount of RAM. We choice 400 MB.
    • Step 6. Virtual Hard Disk. Here we will use a new virtual hard disk with the recommended size, 8GB.
      Virtual Hard Disk
    • Step 7. After it, VirtualBox show you a Wizard to create a new disk virtual. Click Next and select the Hard Disk Store Type. By default the storage type is a dynamically expanding storage.
      Create New Virtual DiskStorage Type
    • Step 8. The following step is to select the location where we want to save our virtual disk and select the size of it.
      virtual disk location and size
    • Step 9. At the end, the wizard show you the summary. Now, we can see in the VirtualBox Manager out VM.
      summary > VirtualBox Manager
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