Background Why Docker has quite an amount of buzz around it today because it makes so many things easy that were difficult with virtual machines. Docker containers makes it easy for Developers, Systems Administrators, Architects, Consultants and others to quickly test a piece of software in a container; much quicker than a virtual machine, and
Continue Reading “A Practical Introduction to Docker Containers”
At JUDCon 2013 in Boston, Scott Cranton and I presented a talk entitled Resilient Enterprise Messaging with Fuse & Red Hat Enterprise Linux. This technical article is the follow up work from that presentation.
Continue Reading “Resilient Enterprise Messaging with JBoss A-MQ & Red Hat Enterprise Linux”
As I discussed in an article entitled Red Enterprise Linux Release Speed, developers sometimes have a problem with how slow Red Hat’s Enterprise Linux releases new versions of software. Well, the good news is, Software Collections are here. Software Collections provide Red Hat Enterprise Linux users with newer versions of programming languages and server daemons
Background The goal of this article is use the OpenShift Platform as a Service (PaaS) as a learning platform for Django. Most of the technical articles out there about running Django on OpenShift assume the user already understands how to administer Django environments and projects. This article is written from the perspective of someone who
Background Recently, I came across an article entitled: 5 Reasons Not to Use CentOS. While I actually disagree with all five points from a technical debate standpoint, I think this article is really the result of a few pain points that some developers express when talking about enterprise editions of Linux. Working as a technology
Background I manage the crunchtools lab and the infrastructure for this blog similar to a development data center. I have a rigorous weekly checklist, which includes optionally applying operating system patches as they are available. I do not perform the updates every week because of time constraints, but when I do, I patch all of
Background In my ever evolving lab, it came time to integrate Red Hat Enterprise Linux (RHEV) with Identity, Policy, Audit (IPA).There were a few caveats and searching Google didn’t help, so hopefully this article can save you some time. Integrating the two was fairly straitforward. The biggest challenge was finding a quick and easy way
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Background This weekend I decided to upgrade my home network with a Cisco WRVS4400N wireless router. Like a typical router it can provide standard wireless services WPA2, DHCP, etc, but the this model also provides support for four distinct VLANs and four distinct SSIDs. This has allowed me to create separate networks for work, play,
Background Recently, I discovered how to use the openssl provided CA script to create a certificate authority and self signed certificates. Traditionally, I had ran all fo the commands manually. When using the CA script it is critical to understand the underlying security concepts. Certificate Authority Openssl has infrstructure to create a long lived Certificate
Background My lab environment is supported by a KVM virtual network at each site. It includes four datacenters, more than a handful of physical machines and tens of KVM based virtual machines. Recently, I discovered that libvirtd does some interesting things with iptables FORWARD rules. When a NAT KVM virtual network is added, the following
