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Luis Sequeira

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  • How to setup a Kubernetes cluster

    Blog Aug 1, 2018 | 15:06 pm

    How to setup a Kubernetes cluster The initial setup constists of a remote server running KVM in which three virtual machines were installed using Ubuntu 16.04. Each virtual machine has one network interface bridged to a physical network interface on the remote server, so that each VM is using a different interface of the server and IP addresses were asigned accordingly. At the end of this tutorial, you will have a kubernetes cluster that consist of one Kubernetes master and two Kubernetes nodes. Docker installation First, let's install updates, dependencies and docker:sudo apt updatesudo apt upgradesudo apt install apt-transport-https # already installedsudo apt install docker.io Now,[…]

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  • Kerberos protocol operation

    Blog Sep 8, 2014 | 23:00 pm

    Kerberos protocol operation The authentication protocol Kerberos allows a number of computers to prove their identity among them safely over an insecure network. The operation of the protocol is based on the Needham-Schroeder protocol, which defines a ''trusted third party'' called Key Distribution Center (KDC). William Stallings in his book Fundamentals of Network Security: Applications and Standards, Second Edition (p.394) defines a KDC as follows: Authorized system to transmit temporary session key for users. Each session key is transmitted encrypted using a master key that the Key Distribution Center shares with the target user. The KDC can be seen as a set of[…]

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  • How to modify files with SED?

    Blog May 12, 2014 | 06:00 am

    How to modify files with SED? What is sed? Sed is a stream editor which is used to perform basic text transformations on an input stream (a file or input from a pipeline) or filter strings. It permits to modify the contents of different lines in a file, based on some parameters. For the examples shown in this article, you used the 4.2.1 version of sed as shown below:sed --versionGNU sed version 4.2.1Copyright (C) 2009 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,to the extent permitted by law.[…]

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  • Femtocell's access methods

    Blog May 5, 2014 | 06:00 am

    Femtocell's access methods Femtocells are low-power and low-cost base stations that provide residential cellular services, providing a coverage of roughly 10 m [1]. They can integrate with mobile operator through a broadband connection, typically ADSL. In General, femtocell makes that the traffic from the home cellular system, deviates through the broadband connection, releasing the resource consumption of the macrocell. The 3GPP has introduced the concept of Closed Subscriber Group (CSG), which essentially identifies a group of subscribers who have access permission to one or more cells. Femtocells basically have three different operating modes: open access, closed access and a combination of both named[…]

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  • What is LaTeX?

    Blog Apr 28, 2014 | 06:00 am

    What is LaTeX? Latex is a language for high quality editing documents, especially oriented to book composition, scientific and technical documents, that include formulas and high quality images. It consists on a set of Tex macros (one low-level language) and has become almost a standard for scientific publications in areas such as mathematics, physics and engineering, since we can have finer control over any typographical appearance of the document. Latex is not a text editor, is a language for preparing documents and therefore its appearance is not equal. The latex editors differ of the WYSIWYG editor (what you see is what you get)[…]

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