Julio's Blog


High Availability and Pacemaker 101!

In this blog post, we will talk a little bit about High Availability and a little bit more about Pacemaker. Here are some of the topics of this post: Introduction to High Availability (HA) and Clustering. Benefits of Highly Available applications. How HA is implemented on Red Hat Enterprise Linux (RHEL) 7. HA requirements on RHEL 7. Demo: Building a 3 node Apache cluster. Introduction to High Availability (HA) and Clustering. What is High Availability (HA)? In IT, High Availability refers to a system or component that is continuously operational for a desirably long length of time. 3 cores principles to HA Elimination of single point... read more »


Selecting the right storage backend for your OpenStack cloud.

Embracing OpenStack or any other Infrastructure-As-A-Service (IaaS) platform should not be the only decision to take on the road to building your private cloud. Selecting the right cloud components like server hardware, network (architecture and topology), and storage backend is crucial to creating an OpenStack cloud architecture that will meet your needs. In this article, I will discuss what are the considerations to take when choosing the storage backend for your OpenStack cloud. What could go wrong First, let's discuss what could be the pitfalls of selecting the wrong storage backend for your OpenStack cluster: Performance problems: You will most likely have performance issues if your... read more »


Architecting your first OpenStack cloud.

OpenStack is the most popular open-source cloud computing platform to build and manage infrastructure-as-a-service (IaaS) environments. Since its inception in 2010 by Rackspace Hosting and NASA this project has gained popularity and positioned itself as a reliable alternative to proprietary IaaS platforms. Now under the management of the OpenStack Foundation and with more than 30,000 Individual Members from over 170 countries around the world, OpenStack is thriving and increasing its presence in enterprise IT environments. In this article, I will be sharing best practices for the adoption of OpenStack as your IaaS platform and the necessary steps to take while building your cloud. In my... read more »


10 things to do after installing Fedora 24.

In this post, I will cover the top 10 things to do after a fresh install of Fedora 24. In my case I use a Fedora workstation spin (Fedora 24 Cinnamon) and here are the things that I do after a fresh install: 1. Set the hostname [[email protected] ~]# hostnamectl set-hostname desktop.quebolon.local Verify it: [[email protected] ~]# hostname desktop.quebolon.local 2. Enable and configure SSH Enable and start SSH: [[email protected] ~]# systemctl enable sshd; systemctl start sshd Created symlink from /etc/systemd/system/multi-user.target.wants/sshd.service to /usr/lib/systemd/system/sshd.service. Verify that SSH is working: [[email protected] ~]# systemctl status... read more »


Upgrading to Fedora 24.

In today post I will show you how to upgrade to Fedora 24 from Fedora 23. The first thing that we are going to check the current version of Fedora and also apply any patches to the system: [email protected]:[~]#cat /etc/redhat-release Fedora release 23 (Twenty Three) [email protected]:[~]#dnf update -y After this we will refresh the system: [email protected]:[~]# dnf upgrade --refresh RPM Fusion for Fedora 23 - Free - Updates 13 kB/s | 1.3 kB 00:00 RPM Fusion for Fedora 23 - Nonfree - Updates 11 kB/s | 1.3 kB 00:00 Open source multiplatform video transcoder 239 kB/... read more »