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Colin Walker

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Top Stories by Colin Walker

What could you do with your code in 20 Lines or Less? That's the question I ask (almost) every week for the devcentral community, and every week I go looking to find cool new examples that show just how flexible and powerful iRules can be without getting in over your head. Here are a few more cool iRules from the forums. This week I’ve included one of the simplest, shortest iRules to ever make the 20LoL. It just struck me as something quite useful that I’m willing to bet several people will look at and say “oh, that’s handy” despite the fact that it’s not complex or long.  Keep the code coming. Multiple Matches with Switch http://devcentral.f5.com/Default.aspx?tabid=53&forumid=5&postid=60678&view=topic Joe answered a plea for help from the forums that showed how to modify an existing iRule that mad use of switch dropping through to multiple match cases.  This is a ... (more)

DevCentral Top5 01/22/2010

Wow! What a whirlwind it's been the past few weeks. Between holidays and vacation and people traveling out of town, it's been an absolute zoo around here. Though I've been out the past week or so there has been an avalanche of content. I've hemmed and hawed and finally managed to slim my picks down to just five, though there are at least a dozen awesome things worth checking out on DevCentral in the past week or so. So don't be shy, get out there and poke around for yourself. For now, though, here are my top 5 picks for the week: v10.1 - The table Command - The Basics http://de... (more)

Winner Winner, iRule Dinner

Last week I wrote about the iRules challenge issued to the FSEs again, and showed my intended solution.  Go take a look at that post for a point of reference if you like, or just dive in. Today I want to give props where props are due, and show off the winner and two runners up of the FSE iRules Challenge.  Big congrats to Harry Kleinbourg, Sudarshan Sivaperumal, and the winner, Karl Vogel.  Excellent work, guys!  There were many solid entries so the judging was surprisingly close, but these three engineers came the closest to the complete solution while keeping an eye towards e... (more)

iRules Concepts: Tcl, The How and Why

F5 uses TCL as the interpreter for iRules. Many people often ask why that is. This questions is usually followed up by an immediate, "Why not Perl?" or "Why not Java" or "Why not ?". I understand the question, and frankly I'm a Perl guy from way back myself, so when I first landed at F5 and started devouring all things iRules, I was curious about the same thing. Since then I've discussed this topic with some of F5's best, in my opinion, and have come to understand that there are many solid reasons for choosing the runtime that we use. Whe... (more)

Friendly URL Redirection Scaling via iRules

The concept of a friendly URL is a pretty simple one. Basically you want to make things in your application, on your website, etc. easier to access. This stems from the fact that most applications these days make use of increasingly complex paths for a multitude of reasons. Whether it’s user specific content, auto generated pages or otherwise, typing in a URL that looks like “http://domain.com/a7391/users/0928179/events/live/release/20110403/regions.php?region=atl” isn’t something that’s easy or frankly even realistic for a user. I’m not going to remember that URL, and if I’m a... (more)