If you are using CentOS and get this error when trying to install a package, “Could not retrieve mirrorlist http:/mirrorlist.centos.org” … More Update CentOS repositories after mirrorlist End of Life
A list of useful commands to manage linux services with systemctl. Service file configuration example Basic example of a systemd … More systemctl: Linux services cheatsheet
Filesystem / is 100% full In this example we have the root Filesystem 100% full, it’s possible to expand the … More How to extend root Filesystem using LVM in CentOS 7 / RHEL 7
Introduction With Katello & Foreman, you can install and configure the open source version of Red Hat Satellite, to manage … More How to install Foreman & Katello (Satellite free version) on CentOS 7
First of all, check your current keyboard language configuration (in this example the current configuration is ES, Spanish) : With … More Change the default Keyboard input Language in Linux
Lab information For this lab, we will distribute the ssh public key of our main server, Ansible Master to two … More Best way to distribute users’s Public ssh Key to many hosts (no prompt password)
To configure a SSH trust relationship providing authentication via RSA public keys is necessary to follow the next steps: Generate … More Configure SSH trust relationship
Requirements: Ubuntu Server Linux with Docker installed. Tip: I have installed a virtual machine using the image: “ubuntu-18.04.2-live-server-amd64”. You can … More How to Install Jenkins using Docker
Escaner de puertos nmap, es la herramienta por excelencia para escanear puertos. Se utiliza para hacer descubrimientos en redes y … More Cheatsheet de nmap
Comando para mostrar la memoria RAM Con el comando free mostramos información de la memoria RAM de nuestra máquina linux, … More Saber cuanta memoria RAM tengo en Linux