Category Sistemas

Probando el SMTP mediante telnet

Siguiendo, como ejemplo, el siguiente link: Use Telnet to test SMTP communication on Exchange servers: Me conecto a mi relay local: telnet smtp_server.domain.com 25 Trying xx.xx.xx.xx… Connected to smtp_server.domain.com Escape character is ‘^]’. 220 mailhost.rceit.com ESMTP Me conecto al servidor que enviará el correo: EHLO gmail.com 250-mailhost.rceit.com 250-8BITMIME 250 SIZE 104857600 Indico el Sender: MAIL […]

Backup de discos USB con dd y pv

Necesito realizar el backup de un disco USB durante varios días por temas de un proyecto. Para ello voy a utilizar los comando dd y pv como solución de backup. 1) Primero instalo el comando pv. root@jberry:~# apt-get install pv 2) Reviso la configuración del disco mediante fdisk root@jberry:~# fdisk -l /dev/sda Disk /dev/sda: 931.5 […]

ERROR: Loading local data is disabled

With the error in MySQL: ERROR: Loading local data is disabled – this must be enabled on both the client and server sides Review: mysql> SHOW GLOBAL VARIABLES LIKE ‘local_infile’; and execute if local_infile is off: mysql> SET GLOBAL local_infile=1; Query OK, 0 rows affected (0.00 sec) Enjoy!!!  

BeerSecOps – EP09: Gene Kim

Steve Giguere @_SteveGiguere_ of Aqua Security met with Gene Kim @RealGeneKim to discuss his personal experiences surrounding the core tenets of his new book the “Unicorn Project”, some of the difficulties as an author, and his experience with DevOps research. Gene Kim is a Wall Street Journal bestselling author, researcher, and multiple award-winning CTO. He […]

Trabajando con SAR en Linux Debian

La aplicación SAR nos permite monitorizar el estado de nuestra máquina Linux, así como del estado de los recursos en base a cuellos de botella, problemas de rendimiento o simplemente mejora del estado de los servicios en general. Para ello incluyo varios comandos básicos para revisión de nuestros sistemas: Instalación en Debian: sudo apt-get install […]

What’s my OS? – What a great page

Tips to know the version of your operative system. Example in Linux: Open a terminal program (get to a command prompt) and type uname -a. This will give you your kernel version, but might not mention the distribution your running. To find out what distribution of linux your running (Ex. Ubuntu) try lsb_release -a or […]

Working with iptables

This is my notes, links and videos about iptables. Please, send me your informatio to upgrae the site. Concepts of iptables: Types of tables: Filter: Contains the built in chains for inputs, forwards and outputs: INPUT – packages destined for local sockets FORWARD – packets routed through the system OUTPUT – packets generated locally Nat: is consulted when […]

Problems connecting CentOS with SSH

I’ve been the error: ssh : Permission denied (publickey,gssapi-with-mic) when I try to connect to my new CentOS box. The Solution: sudo sed -i ‘s/PasswordAuthentication no/PasswordAuthentication yes/g’ /etc/ssh/sshd_config; sudo systemctl restart sshd; That’s all. Enjoy!!!  

The race is on to dominate quantum computing – The Economist (Subscrition)

Great article about the future of the quantum computing in the Economist (you need subscription to read it). With the promise of outclassing even the world’s fasters supercomputers, The Economist thinks about the future of this technology. It explain the competition about the quantum between companies like IBM, Google or Microsoft and the quantum situation […]

Nos vemos en Red Hat Forum España 2018

Gran evento de Red Hat en Madrid para el próximo día 30 de Octubre de 2018.   Mas información en la Web de Red Hat: Red Hat Foruem España 2018 Enjoy!!!