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Load Balancing 101 Archive
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State Of GSLB: DNS FTW
Posted on March 13, 2008 | No CommentsBack when load balancers were the toast of the town, there were two competing methods for GSLB (Geographic Server Load Balancing). The first method was through use of DNS (and perhaps some IP or HTTP redirection), and the second was to use some type of... -
Port Confusion
Posted on January 25, 2008 | No CommentsThere was a recent post on the lb-l mailing list which discussed a problem relating to combining SSL and non-SSL virtualJerry o the free nextel free cingular ringtones download polyphonic ringtone. services pointing to the same web server(s). The issue comes up when you have... -
4 Things You Can Do To Improve Your Load Balancing Infrastructure for 2008
Posted on January 21, 2008 | No CommentsIt’s a new year, and time for resolutions and all that. In that spirit, I’ve put together a list of 4 things you can do to improve your load balancing infrastructure. Some are quick, some are more involved, but they’ll all pay huge dividends. ... -
Troubleshoot Any Load Balancing Ailment: End-to-End Connectivity
Posted on December 20, 2007 | 3 CommentsYou’re stumped. There’s a problem with your infrastructure, and you’re not positive what it is. You checked a few things out, but the symptoms befuddle you. You’re pretty sure it’s not the load balancer, but everyone is pointing at you, and you’ve got no proof.... -
BIG-IP V4 Test Script
Posted on December 12, 2007 | 2 CommentsWhen I’m diagnosing load balancing issues, there are three really critical tools I use: TCPDump HTTP Header dump (such as Live HTTP Headers) Telnet Yup, telnet. I don’t know about anyone else, but I use telnet excessively. Basically, I use it to test TCP connectivity,... -
The Argument For Cookies
Posted on September 6, 2007 | 1 CommentOccasionally, I’ll find myself in a defensive position with regards to cookie persistence implementation. Some question it’s usefulness. Others have a concern about performance. I’ll try to address both here. First, we’re talking about persistence. Most applications are stateful, so they require users be directed... -
Another Critical Diagnostic Tool
Posted on August 10, 2007 | No CommentsIn my last post, I talked about the venerable tcpdump tool. For load balancing, it’s a critical tool for diagnosing issues. Another tool, equally as critical, is an HTTP header-sniffer. For Firefox, one such tool is Live HTTP Headers. For Internet Explorer, there’s ieHTTPHeaders. Both... -
A Tale of Two Markets
Posted on May 22, 2007 | No CommentsIn the beginning, there was but one load balancing/application delivery market, and it was good. A couple of years and one dot-com meltdown later and somehow, unknown to many, we have two very distinct load balancer markets. The first market, the enterprise or “premium†market,... -
Network World’s Load Balancer Buyer’s Guide
Posted on April 24, 2007 | No CommentsThe buyer’s guide I had mentioned before has gone live on Network World’s site: Server Load Balancing: A Practical Guide. -
SSL Transactions Per Second: What do you need?
Posted on April 23, 2007 | No CommentsWhen shopping for an SSL acceleration device, whether it’s integrated into a load balancer or a stand-alone device, I’ve noticed people tend to vastly overestimate their needs when it comes to TPS (Transactions per Second). Users might balk at 1,000 TPS. After all, 1,000 SSL...