Virtualization technologies have evolved such that support for multiple networks on a single host is a must-have feature. For example, Red Hat Enterprise Virtualization allows administrators to configure multiple NICs using bonding for several networks to allow high throughput or high availability. In this configuration, different networks can be used for connecting virtual machines (using layer 2 Linux bridges) or for other uses such as host storage access (iSCSI, NFS), migration, display (SPICE, VNC), or for virtual machine management. While it is possible to consolidate all of these networks into a single network, separating them into multiple networks enables simplified management, improved security, and an easier way to track errors and/or downtime.
The aforementioned configuration works great but leaves us with a network bottleneck at the host level. All networks compete on the same queue in the NIC / in a bonded configuration and Linux will only enforce a trivial quality of service queuing algorithm, namely: pfifo_fast, which queues side by side, where packets can be enqueued based on their Type of Service bits or assigned priority. One can easily imagine a case where a single network is hogging the outgoing link (e.g. during a migration storm where many virtual machines are being migrated out from the host simultaneously or when there is an attacker VM). The consequences of such cases can include things like lost connectivity to the management engine or lost storage for the host.
A simple solution is to configure
Continue reading “Steps to Optimize Network Quality of Service in Your Data Center”
No, last night’s news wasn’t an early April Fool’s Day joke: Red Hat Enterprise Linux is now available through a no-cost developer subscription as part of the Red Hat Developers Program. All that’s needed is an email address to register for the program and developers then have access to not only Red Hat Enterprise Linux (as part of the Red Hat Enterprise Linux Developer Suite) but also the entire Red Hat JBoss Middleware portfolio and the Red Hat Container Development Kit (CDK).
Continue reading “No Joking: No-cost Red Hat Enterprise Linux is Now Available for Developers”
Yesterday, Intel launched the Xeon E5-2600 v4 processor family with 26 new world records on industry-standard benchmarks. Once again, Intel’s innovation, driven by Moore’s law, has enabled faster computing for the enterprise world.
Red Hat and Intel have enjoyed a long history of collaboration across a full spectrum of enterprise IT – covering a wide range of use cases, from applications running on physical servers to virtualized and cloud-based deployments. It should come as no surprise that many of
Continue reading “Red Hat Enterprise Linux Sets Record Breaking Performance Results on New Generation of Intel Processors”
Some time ago, two different projects were started in the open source community, namely: Ipsilon and Keycloak. These projects were started by groups with different backgrounds and different perspectives. In the beginning, it seemed like these two projects would have very little in common… though both aimed to include
Continue reading “Red Hat Federation Story: Ipsilon & Keycloak… a “Clash of the Titans””
Identity management solutions integrate systems, services, and applications into a single ecosystem that provides authentication, access control, enterprise SSO, identity information and the policies related to those identities. While I have dedicated time to explaining how to provide these capabilities to Linux systems – it is now time to broaden the scope and talk a little bit about services and applications.
In some ways, services and applications are very similar. They are both usually
Continue reading “Identity Management and Application Integration”
Red Hat has long advocated for the importance of cross-industry IT standards, with the intention of enabling ecosystems with broad industry participation and providing a common basis for innovation. Perhaps even more importantly, these standards can help drive adoption of new technologies within enterprises, pushing the cycle of innovation even further along.
With ARM being one of these emerging ecosystems, we wanted to provide a snapshot of a recent event that highlights some of the standards-based work happening in this growing community: last week’s Linaro Connect conference in Bangkok, Thailand.
Continue reading “Connecting the Dots at Linaro Connect”
Yogi Berra, the late baseball great and oft-quoted source of humorous statements about the condition of the world, once said, “It’s tough to make predictions, especially about the future.” Some of his most celebrated remarks were eerily prescient on the subject of using technology to predict the future. As many IT managers today ponder the best way forward with predictive analytics, it might be interesting to think about it from his perspective. Consider predictive analytics in the context of the following classic Yogi-isms
Continue reading “Yogi Berra, Predictive Analytics, and SAP HANA Running on Red Hat Enterprise Linux for SAP HANA”
Over last several months, in meetings with many Red Hat customers, I have been asked about best practices related to migration from an existing third-party identity management solution to Red Hat’s Identity Management (IdM) solution. In today’s post I will share some of my thoughts on this matter…
Continue reading “When to Migrate: Red Hat Identity Management vs. Third-Party Solutions”
With Docker moving all of their official images to Alpine, base image size is a hot topic. Sure, having sane and minimal base images is important, but software supply chain hygiene is equally (if not more) important – interested to understand why?
Among other things, it’s important in a production container environment to have provenance (i.e. knowledge of where your container images came from). Using
Continue reading “Container Tidbits: Can Good Supply Chain Hygiene Mitigate Base Image Sizes?”
Hello again! I have not had time to blog in awhile. What happened? I picked up some additional responsibilities and these consumed a lot of my time. But now… I am back and will be blogging once again.
Time goes on and there are (many) new topics that are worth sharing with you. The first subject that I want to cover is the new Identity Management (IdM) features in Red Hat Enterprise Linux 7.2. While the release happened nearly three months ago – it’s still worth me providing an overview of new features and functionality. Another subject that people often ask about nowadays is the conversion from 3rd party vendor solutions to the IdM offering from Red Hat. We see a lot of interest in this area and I want to share some hints for when it is a good idea to use what we offer and when it might not be. Finally, there are also some emerging technologies
Continue reading “Back to Blogging: New Identity Management Features in RHEL 7.2”