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Getting Started with iRules LX, Part 5: Troubleshooting

When you start writing code, you will eventually run into some issue and need to troubleshoot. We have a few tools available for you. Logging One of the most common tools use for troubleshooting is logging. STDOUT and STDERR for the Node.js... Read more
2 Reviews

Advanced iRules: Scan

Scan is used to parse out strings. It takes a string and based on your format parameters, stores the matches in one or more variables. It also returns the number of conversions performed, so it can be used in a conditional as well. For all the... Read more
1 Review

Advanced iRules: Binary Scan

The binary scan command, like the scan command covered in this Advanced iRules series, parses strings. Only, as the adjective indicates, it parses binary strings. In this article, I’ll highlight the command syntax and a few of the format string... Read more
0 Reviews

Advanced iRules: Tables

We’ve covered quite a bit of ground in the Getting Started with iRules and Intermediate iRules series. In this series, we’ll dive even deeper down the rabbit hole, starting with the table command. This article is a primer for the power of tables,... Read more
0 Reviews

Advanced iRules: Regular Expressions

A regular expression or regex for short is essentially a string that is used to describe or match a set of strings, according to certain syntax rules. Regular expressions ("REs") come in two basic flavors: extended REs ("ERE"s)... Read more
0 Reviews

Getting Started with iRules LX, Part 4: NPM & Best Practices

Sooner or later you will find yourself wanting to install packages from NPM to help you fulfill a use case. NPM on BIG-IP works much of the same way you use it on a server. We recommend that you not install modules... Read more
1 Review

Getting Started with iRules LX, Part 3: Coding & Exception Handling

In this article, we will cover the coding of iRules LX. TCL Commands As mentioned in the first article, we still need iRules TCL to make a RPC to Node.js. iRules LX introduces 3 new iRules TCL commands - ILX::init - Creates a RPC handle to... Read more
2 Reviews

Getting Started with iRules LX, Part 2: Configuration & Workflow

In the previous article in this series we covered the reasons for iRules LX and the conceptual operation. Now we need learn the new configurations items that iRules LX introduces. Since iRules LX has DevOps teams in mind, there is a slightly different workflow than... Read more
Average Rating: 4.9
5 Reviews

Getting Started with iRules LX, Part 1: Introduction & Conceptual Overview

What is iRules LX? The release of BIG-IP TMOS 12.1.0 brought a new feature called iRules LX. iRules LX is the next generation of iRules that allows you to programmatically extend the functionality of BIG-IP with Node.js. What is Node.js... Read more
Average Rating: 4.9
3 Reviews

Advanced iRules: Getting Started with iRules Procedures

As Colin so eloquently puts it in the procs overview in the iRules wiki: "Ladies and gentlemen, procs are now supported in iRules!" Yes, the rumors are true. As of BIG-IP version 11.4, you can move all that repetitive code into... Read more
Average Rating: 4.9
9 Reviews

Intermediate iRules: String Handling Exercise

I had the privilege of watching an exercise in string handling unfold on an internal list recently that should have its day in the community. The Problem URLs for this particular application arrive in this format:... Read more
1 Review

Advanced iRules: SMTP Start TLS

F5er and DevCentral member natty76 wrote a few iRules a while back on interactive TLS session starting on the SMTP, IMAP, and POP3 protocols. A lot of the iRules can be understood from a flow perspective by reading the iRule top to bottom. This is... Read more
0 Reviews

Advanced iRules: Sideband Connections

With the release of BIG-IP version 11 there are many, many new features and capabilities to come up to sped on. Not the least of which are the additions and changes to the already powerful iRules infrastructure. iRules, as a whole, is an amazingly... Read more
0 Reviews

The table Command: Examples

With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global data. We are very proud to introduce the... Read more
2 Reviews

The table Command: The Fine Print

With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global data. We are very proud to introduce the... Read more
2 Reviews

The table Command: Counting

With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global data. We are very proud to introduce the... Read more
0 Reviews

The table Command: Subtables

With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global data. We are very proud to introduce the... Read more
Average Rating: 4.9
4 Reviews

The table Command: Advanced Data Expiration

With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global data. We are very proud to introduce the... Read more
0 Reviews

The table Command: Data Expiration

With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global data. We are very proud to introduce the... Read more
Average Rating: 4.2
3 Reviews

The table Command: New Ways To Alter Data

With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global data. We are very proud to introduce the... Read more
0 Reviews

The table Command: New Ways To Set Data

With version 10.1, we've given the session table some long-sought functionality, and revamped its iRules interface completely to give users a new, cleaner, full-featured way to keep track of global data. We are very proud to introduce the... Read more
1 Review

The table Command: Basics

The Basics New Ways To Set Data New Ways To Alter Data Data Expiration Advanced Data Expiration Subtables Counting The Fine Print Examples The BIG-IP is a powerful tool when it comes to managing your applic... Read more
Average Rating: 4.3
4 Reviews