Basic iRule Anatomy

In this episode of Lightboard Lessons, Jason Rahm covers the basic anatomy of BIG-IP iRules, a scripting language based on Tcl that allows inspection, manipulation, and redirection of traffic on the wire.

[@leoniaklebanov2502]

Awesome, clear information to iRule users. Awesome!!!!

[@MikeDeanOfficials]

Great summary, thank you.

[@anoopdharan7845]

Hi , any description out there more on irule events , for example what can be done inside an irule event ?

[@devcentral]

iRules are documented here: devcentral.f5.com/wiki/iRules.homepage.ashx.

[@kevindavies6824]

Now available at iRules Reference - clouddocs.f5.com/api/irules/ The more common commands typically come with example code. You can always check out the user-contributed codebase devcentral.f5.com/s/codeshare?tag=iRules

[@kevindavies6824]

iRules Introduction - devcentral.f5.com/s/articles/irules-101-01-introduction-to-irules

[@komalthecoolk]

Having a tough time trying to understand how they shot this lol!

[@AlexeyRivkin]

IMO the video was flipped, to make annotations readable. All guides are writing with their left hand :)

[@ssmantri]

There is a video explaining how they did it, search for it

[@DonaldOfEarth]

On their channel?

[@amitpawar9287]

nice .. Required more examples for Irule

[@kevindavies6824]

Plenty of examples here iRules User Contributed Codebase - devcentral.f5.com/s/codeshare?tag=iRules

[@Soundwave-F7Z]

Do you need the SSL cert on the F5 to use iRules?

[@devcentral]

You only need the SSL cert on the BIG-IP if you need access to the encrypted payload in iRules, but the iRules event loop does not require SSL in and of itself.

[@Soundwave-F7Z]

@F5 DevCentral Thank you for responding. If I wanted to write an iRule that changes the URL from user input: "example.com" to "www.example.com" that would require the SSL cert right ?

[@devcentral]

@@Soundwave-F7Z if that traffic is encrypted then the URL is within the protocol payload so yes, you would need to offload SSL on the BIG-IP to see that URL to rewrite it.

[@superbaim]

hi, Do you have pdf showing what kind of variable,command, and conditional i can use ? Thx.

[@JasonRahm]

+Ibrahim Lubis all the documentation for iRules are here on the @DevCentral wiki: devcentral.f5.com/wiki/iRules.homepage.ashx.

[@kevindavies6824]

Now located at iRules Reference - clouddocs.f5.com/api/irules/ You can also get a full offline copy using Dash 2 and the links from github.com/f5devcentral/f5-offline-dc-docsets. Install the free app then click on the (dash feed) links to load the relevant document set. (scroll down the page)

[@ruchit8762]

where can i find the complete syntax of iRules that can be used?

[@devcentral]

Command/Event syntax for iRules specific commands are here: devcentral.f5.com/wiki/iRules.HomePage.ashx For Tcl commands (not all are supported in iRules), the man pages for 8.4 are here: www.tcl.tk/man/tcl8.4/TclCmd/contents.htm

[@kevindavies6824]

Since F5 DevCentral was refreshed you will now find these at... iRules Reference - clouddocs.f5.com/api/irules/ iRules Introduction - devcentral.f5.com/s/articles/irules-101-01-introduction-to-irules iRules User Contributed Codebase - devcentral.f5.com/s/codeshare?tag=iRules iRules are an enhancement of TCL for the F5 environment TCL Reference - www.tcl.tk/man/tcl8.4/TclCmd/contents.htm

[@coronamex9297]

Horrible explanation !