Welcome!

Linux Containers Authors: Yeshim Deniz, Elizabeth White, Pat Romanski, Liz McMillan, Amit Gupta

Related Topics: Containers Expo Blog, Linux Containers

Containers Expo Blog: Blog Feed Post

FOSS Linux Virtualization Tools

Five things about FOSS Linux virtualization you may not know

In January I attended the 10th annual Southern California Linux Expo. In addition to speaking and running the Ubuntu booth, I had an opportunity to talk to other sysadmins about everything from selection of distribution to the latest in configuration management tools and virtualization technology.

I ended up in a conversation with a fellow sysadmin who was using a proprietary virtualization technology on Red Hat Enterprise Linux. Not only did he have surprising misconceptions about the FOSS (Free and Open Source Software) virtualization tools available, he assumed that some of the features he was paying extra for (or not, as the case may be) wouldn’t be in the FOSS versions of the software available.

Here are five features that you might be surprised to find included in the space of FOSS virtualization tools:

1. Data replication with verification for storage in server clusters

When you consider storage for a cluster there are several things to keep in mind:

  • Storage is part of your cluster too, you want it to be redundant
  • For immediate failover, you need replication between your storage devices
  • For data integrity, you want a verification mechanism to confirm the replication is working

Regardless of what you use for storage (a single hard drive, a RAID array, or an iSCSI device), the open source DRBD (Distributed Replicated Block Device) offers quick replication over a network backplane and verification tools you can run at regular intervals to ensure deta integrity.

Looking to the future, the FOSS distributed object store and file system Ceph is showing great promise for more extensive data replication.

2. Automatic failover in cluster configurations

Whether you’re using KVM Kernel-based Virtual Machine or Xen, automatic failover can be handled via a couple of closely integrated FOSS tools, Pacemaker and Corosync. At the core, Pacemaker handles core configuration of the resources themselves and Corosync handles quorum and “aliveness” checks of the hosts and resources and logic to manage moving Virtual Machines.

3. Graphical interface for administration

While development of graphical interfaces for administration is an active area, many of the basic tasks (and increasingly, more complicated ones) can be made available through the Virtual Machine Manager application. This manager uses the libvirt toolkit, which can also be used to build custom interfaces for management.

The KVM website has a list of other management tools, ranging from command-line (CLI) to Web-based: www.linux-kvm.org/page/Management_Tools

As does the Xen wiki: wiki.xen.org/wiki/Xen_Management_Tools

4. Live migrations to other hosts

In virtualized environments it’s common to reboot a virtual machine to move it from one host to another, but when shared storage is used it is also possible to do live migrations on KVM and Xen. During these live migrations, the virtual machine retains state as it moves between the physical machines. Since there is no reboot, connections stay intact and sessions and services continue to run with only a short blip of unavailability during the switch over.

Documentation for KVM, including hardware and software requirements for such support, can be found here: www.linux-kvm.org/page/Migration

5. Over-allocating shared hardware

KVM has the option to take full advantage of hardware resources by over-allocating both RAM (with adequate swap space available) and CPU. Details about over-allocation and key warnings can be found here: Overcommitting with KVM.

Conclusion

Data replication with verification for storage, automatic failover, graphical interface for administration, live migrations and over-allocating shared hardware are currently available with the FOSS virtualization tools included in many modern Linux distributions. As with all moves to a more virtualized environment, deployments require diligent testing procedures and configuration but there are many on-line resources available and the friendly folks at LinuxForce to help.

Read the original blog entry...

More Stories By CJ Fearnley

CJ Fearnley was an early leader in the adoption and implementation of Linux and Free and Open Source Software (FOSS) in Philadelphia.

In 1993, he recognized the emerging value of the Linux operating system. Through his leadership position in the Philadelphia Area Computer Society (PACS), he began introducing Linux to organizations in the Greater Philadelphia region. At PACS, he organized monthly presentations on Linux and FOSS and wrote 29 columns in the organization’s print periodical, The Databus. He then founded and helped build Philadelphia’s premiere Linux user group, the Philadelphia area Linux User Group (PLUG), where he continues to facilitate its first Wednesday meetings. After helping to establish a community and culture for Linux and FOSS in Philadelphia, CJ started building his first company, LinuxForce, to be the “go-to” firm for organizations wanting to realize the promise and power of Linux. LinuxForce is a leading technology services provider specializing in the development, implementation, management and support of Linux-based systems, with a particular expertise in Debian GNU/Linux and Ubuntu. LinuxForce provides remote Linux systems management services to clients including The Franklin Institute Science Museum and the Aker Philadelphia Shipyard through its flagship service offering Remote Responder.

In addition, CJ Fearnley has applied his organizational and leadership talent to building Buckminster Fuller’s legacy. CJ published an essay Reading Synergetics: Some Tips to help students of Fuller’s magnum opus, Synergetics: Explorations in the Geometry of Thinking, wade through that complex, multi-dimensional tome. He started maintaining The R. Buckminster Fuller FAQ on the Internet in 1994. His work on Buckminster Fuller was featured in an extensive interview published by Dome Magazine in 1999. In 2002 CJ started building the Synergetics Collaborative (SNEC) as an organization to bring together people with an interest in Synergetics’ methods and principles in workshops, symposia, seminars, and other meetings.

CJ received his BA in Mathematical Sciences and Philosophy from Binghamton University in 1989 where he was a Regents Scholar and has done graduate work at Drexel University. CJ was named to the Philadelphia Business Journal’s 2006 “40 Under 40″ List as one of the region’s most accomplished young professionals.

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


@ThingsExpo Stories
Real IoT production deployments running at scale are collecting sensor data from hundreds / thousands / millions of devices. The goal is to take business-critical actions on the real-time data and find insights from stored datasets. In his session at @ThingsExpo, John Walicki, Watson IoT Developer Advocate at IBM Cloud, will provide a fast-paced developer journey that follows the IoT sensor data from generation, to edge gateway, to edge analytics, to encryption, to the IBM Bluemix cloud, to Wa...
What is the best strategy for selecting the right offshore company for your business? In his session at 21st Cloud Expo, Alan Winters, U.S. Head of Business Development at MobiDev, will discuss the things to look for - positive and negative - in evaluating your options. He will also discuss how to maximize productivity with your offshore developers. Before you start your search, clearly understand your business needs and how that impacts software choices.
SYS-CON Events announced today that Fusic will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Fusic Co. provides mocks as virtual IoT devices. You can customize mocks, and get any amount of data at any time in your test. For more information, visit https://fusic.co.jp/english/.
SYS-CON Events announced today that Massive Networks, that helps your business operate seamlessly with fast, reliable, and secure internet and network solutions, has been named "Exhibitor" of SYS-CON's 21st International Cloud Expo ®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. As a premier telecommunications provider, Massive Networks is headquartered out of Louisville, Colorado. With years of experience under their belt, their team of...
SYS-CON Events announced today that Enroute Lab will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Enroute Lab is an industrial design, research and development company of unmanned robotic vehicle system. For more information, please visit http://elab.co.jp/.
SYS-CON Events announced today that MIRAI Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. MIRAI Inc. are IT consultants from the public sector whose mission is to solve social issues by technology and innovation and to create a meaningful future for people.
SYS-CON Events announced today that Mobile Create USA will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Mobile Create USA Inc. is an MVNO-based business model that uses portable communication devices and cellular-based infrastructure in the development, sales, operation and mobile communications systems incorporating GPS capabi...
SYS-CON Events announced today that Interface Corporation will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Interface Corporation is a company developing, manufacturing and marketing high quality and wide variety of industrial computers and interface modules such as PCIs and PCI express. For more information, visit http://www.i...
SYS-CON Events announced today that Keisoku Research Consultant Co. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Keisoku Research Consultant, Co. offers research and consulting in a wide range of civil engineering-related fields from information construction to preservation of cultural properties. For more information, vi...
There is huge complexity in implementing a successful digital business that requires efficient on-premise and cloud back-end infrastructure, IT and Internet of Things (IoT) data, analytics, Machine Learning, Artificial Intelligence (AI) and Digital Applications. In the data center alone, there are physical and virtual infrastructures, multiple operating systems, multiple applications and new and emerging business and technological paradigms such as cloud computing and XaaS. And then there are pe...
SYS-CON Events announced today that SIGMA Corporation will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. uLaser flow inspection device from the Japanese top share to Global Standard! Then, make the best use of data to flip to next page. For more information, visit http://www.sigma-k.co.jp/en/.
SYS-CON Events announced today that B2Cloud will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. B2Cloud specializes in IoT devices for preventive and predictive maintenance in any kind of equipment retrieving data like Energy consumption, working time, temperature, humidity, pressure, etc.
Agile has finally jumped the technology shark, expanding outside the software world. Enterprises are now increasingly adopting Agile practices across their organizations in order to successfully navigate the disruptive waters that threaten to drown them. In our quest for establishing change as a core competency in our organizations, this business-centric notion of Agile is an essential component of Agile Digital Transformation. In the years since the publication of the Agile Manifesto, the conn...
While some developers care passionately about how data centers and clouds are architected, for most, it is only the end result that matters. To the majority of companies, technology exists to solve a business problem, and only delivers value when it is solving that problem. 2017 brings the mainstream adoption of containers for production workloads. In his session at 21st Cloud Expo, Ben McCormack, VP of Operations at Evernote, will discuss how data centers of the future will be managed, how th...
SYS-CON Events announced today that NetApp has been named “Bronze Sponsor” of SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. NetApp is the data authority for hybrid cloud. NetApp provides a full range of hybrid cloud data services that simplify management of applications and data across cloud and on-premises environments to accelerate digital transformation. Together with their partners, NetApp em...
SYS-CON Events announced today that Nihon Micron will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Nihon Micron Co., Ltd. strives for technological innovation to establish high-density, high-precision processing technology for providing printed circuit board and metal mount RFID tags used for communication devices. For more inf...
SYS-CON Events announced today that Suzuki Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Suzuki Inc. is a semiconductor-related business, including sales of consuming parts, parts repair, and maintenance for semiconductor manufacturing machines, etc. It is also a health care business providing experimental research for...
SYS-CON Events announced today that Ryobi Systems will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Ryobi Systems Co., Ltd., as an information service company, specialized in business support for local governments and medical industry. We are challenging to achive the precision farming with AI. For more information, visit http:...
SYS-CON Events announced today that Daiya Industry will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Daiya Industry specializes in orthotic support systems and assistive devices with pneumatic artificial muscles in order to contribute to an extended healthy life expectancy. For more information, please visit https://www.daiyak...
In his session at @ThingsExpo, Greg Gorman is the Director, IoT Developer Ecosystem, Watson IoT, will provide a short tutorial on Node-RED, a Node.js-based programming tool for wiring together hardware devices, APIs and online services in new and interesting ways. It provides a browser-based editor that makes it easy to wire together flows using a wide range of nodes in the palette that can be deployed to its runtime in a single-click. There is a large library of contributed nodes that help so...