Federico Cargnelutti

Category: Linux

  • How to pass variables to a Docker container when building a Node app

    Environment variables are declared with the ENV statement and are notated in the Dockerfile either with $VARIABLE_NAME or ${VARIABLE_NAME}. Passing variables at build-time The ENV instruction sets the environment variable to the value. The environment variables set using ENV will persist when a container is run from the resulting image. For example: The Dockerfile allows you to specify arguments…

  • Check whether your web server is correctly configured

    Last year Zone-H reported a record number of 1.5 million websites defacements. 1 million of those websites where running Apache. When it comes to configuring a web server, some people tend to turn everything on by default. Developers are happy because the functionality that they wanted is available without any extra configuration, and there is…

  • Apache HTTP DoS tool released

    Yesterday an interesting HTTP DoS tool has been released. The tool performs a Denial of Service attack on Apache (and some other, see below) servers by exhausting available connections. While there are a lot of DoS tools available today, this one is particularly interesting because it holds the connection open while sending incomplete HTTP requests…

  • Fabric: Simple Pythonic Deployment Tool

    Here’s the thing: you’re developing a server deployed application, it could be a web application but it doesn’t have to be, and you’re probably deploying to more than one server. Even if you just have one server to deploy to, it still get tiresome in the long run to build your project, fire up your…

  • Using Unison to synchronize more than two machines

    Rsync is great, however, it only synchronizes files in one direction. Unison, on the other hand, synchronizes both ways. It allows two replicas of a collection of files and directories to be stored on different hosts, modified separately, and then brought up to date by propagating the changes in each replica to the other. Why…

  • Building desktop Linux applications with JavaScript

    During his keynote presentation at OSCON last year, Ubuntu founder Mark Shuttleworth described application extensibility as an important enabler of innovation and user empowerment. Citing the Firefox web browser and its rich ecosystem of add-ons as an example, Shuttleworth suggested that the Linux community could deliver a lot of extra value by making scriptable automation…

  • Running Quercus in Jetty Web Server

    Jetty Web server can be invoked and installed as a stand alone application server. It has a flexible component based architecture that allows it to be easily deployed and integrated in a diverse range of instances. The project is supported by a growing community and a team with a history of being responsive to innovations…

  • Cloning your Ubuntu Installation

    It’s always handy to have a complete list of packages installed, specially if you want to create a system that is similar to a different system you have already set up. In this post I’ll cover how you can export a list of installed packages on one Ubuntu system, and import them into another to…

  • Meet Intrepid Ibex, also known as Kubuntu 8.10

    Intrepid Ibex is the codename for Kubuntu 8.10, due to be released October 30 2008. The focus for 8.10 for the Kubuntu community will be transitioning to a KDE 4 desktop. The plan is to integrate the existing Kubuntu software while at the same time offering the best out-of-the-box KDE 4 experience around. Intrepid Ibex…

  • FileSyncTask: Using Phing to synchronize files and directories

    I needed to automate the task of synchronizing files from one server to another, so I wrote a Phing task. Finally today I found some time to finish writing the documentation. Overview FileSyncTask is a Phing extension for Unix systems which synchronizes files and directories from one location to another while minimizing data transfer. FileSyncTask…

  • The easiest way to search and replace in files

    The “find” command is one of the most powerful and useful Unix commands, you can use it to locate files, and then perform some type of action on the files after they’ve been located. With this capability, you can locate files using powerful search criteria, and then run any Unix command you want on the…