What are iRules in F5 LTM?

WHAT IS AN I-RULE ?

An iRule is TCL based scripting language code which is used when you want to extend the capabilities of the BIG-IP that are unavailable by default.
iRules can route, re-route, redirect, inspect, modify, delay, discard or reject, log or … do just about anything else with network traffic passing through a BIG-IP.

3 STEPS TO WRITE I-RULES ?

1) Events

An event will dig into much more detail, it is a way of executing iRules code at a given point in time
within the flow of a networking session. Events are also important because they indicate at which point in the proxy chain an iRule executes (incoming/outgoing). Given that BIG-IP is a bi-directional proxy, it is important for iRules to execute on not only the right side of the proxy, but at the right moment in the network flow.

2) Conditional statement

If a particular condition exists which may have combinations of relational/logical operators some specific action will get executed else there may be some other action.

3) Action

It performs actions such as sending traffic on a specific pool, redirecting URI, deleting cookies, etc.

EXAMPLE OF I-RULES
Lets understand its components very closely by following examples. Comments are enclosed by hash “#”.
#Event
when HTTP_REQUEST {
#Conditional Statement
if {[HTTP::uri] ends_with “jpg”} {
#Action1
pool Pool1
}
#Action2
else { pool Pool2 }
}

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