Linux Server Cluster for Load Balancing

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The Linux Virtual Server is a highly scalable and highly available server built on a cluster of real servers, with the load balancer running on the Linux operating system. The architecture of the server cluster is fully transparent to end users, and the users interact as if it were a single high-performance virtual server. For more information, click here.

via The Linux Virtual Server Project – Linux Server Cluster for Load Balancing.

Linux Virtual Server Tutorial

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The Linux Virtual Server Project (LVS) allows load balancing of networked services such as web and mail servers using Layer 4 Switching. It is extremely fast and allows such services to be scaled to service 10s or 100s of thousands of simultaneous connections. The purpose of this tutorial is to demonstrate how to use various features of LVS to load balance Internet services, and how this can be made highly available using tools such as such as heartbeat and keepalived. It will also cover more advanced topics which have been the subject of recent development including maintaining active connections in a highly available environment and using active feedback to better distribute load.

Via Linux Virtual Server Tutorial.

Set up a Web server cluster in 5 easy steps

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This article illustrates the robust Apache Web server stack with 6 Apache server nodes (though 3 nodes is sufficient for following the steps outlined here) as well as 3 Linux Virtual Server (LVS) directors. We used 6 Apache server nodes to drive higher workload throughputs during testing and thereby simulate larger deployments

via Set up a Web server cluster in 5 easy steps.

The Next Generation of Unified Communications

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Microsoft® Lync® is an enterprise-ready unified communications platform. With Lync, users can keep track of their contacts’ availability; send an IM; start or join an audio, video, or web conference; or make a phone call—all through a consistent, familiar interface.  Lync is built to fully integrate with Microsoft Office. The Microsoft Lync 2010 desktop client is available for Windows and for Mac and mobile versions are available for Windows Phone, iPhone/iPad, and Android devices.

Via The Next Generation of Unified Communications – Microsoft Lync.

How Linux mastered Wall Street

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Others just use off-the-shelf distributions and pay consultants to tweak the settings for maximum performance. Red Hat Enterprise Linux is now the dominant Linux distribution among exchanges, Lameter said. Red Hat counts among its customers the Chicago Mercantile Exchange, New York Mercantile Exchange, Frankfurt Stock Exchange, Eurex derivative exchange and Philippine Stock Exchange.

via How Linux mastered Wall Street | ITworld.

The Five Levels of ISP Evil

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This is a serious allegation, but it’s the tip of the iceberg. I’m not sure if everyone understands the levels of sneakiness that service providers can engage in. So, while I’m no expert (as we are an ISP who doesn’t do these things), but as a broad overview, here is my quick guide to the five levels of ISP evil, and the various “opportunities to monetize customers” that we’ve passed on:

via Sonic.net CEO Blog » Blog Archive » The Five Levels of ISP Evil.

Linux CD / DVD Locked and Drive Is Not Opening / Ejecting CD

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You might also try disallowing the kernel from locking the cdrom. Sometimes a rogue process will hold onto the drive for no real reason. This way is often much cleaner than killing the process.

# Temporarily unlock the cdrom
echo 0 > /proc/sys/dev/cdrom/lock

# Permanently unlock the cdrom
echo “sys.dev.cdrom.lock=0″ >> /etc/sysctl.conf

via Linux CD / DVD Locked and Drive Is Not Opening / Ejecting CD.