Rossel, Thank you for the links. We might do this any number of times in many different ways. Combined Example It may help your understanding further if I work through the examples given prior in one go, with some example code. Our inability to fully predict the output of this computation when given the unlimited and unpredictable variability of possible input is the basic cause of most software security issues and bugs. The output of our iRule program is one or more actions and possibly also some data. 
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Clarity notwithstanding, I think it is also accurate to think of each event within an iRule as the start of a separate edltor and a single iRule containing multiple events as a collection of programs.
Please send me a link of the book that you are referring to. I looked at a list of your books, but did not know where to start. This is the core of iRules and most other programming languagesimplemented using the various commands available.
Also, I was not able to find you in Twitter or Facebook. The series is useful but still not quite beginner level material. We also need to consider something that may not be part of the program itself but which is rather essential:. We might do this any number of times in many different ways. Steven, Thanks for the reply. Furthermore, we may also specify a specific V5 address to be used if the comparison is true, or take some other action if it is false there is no match.
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Do you know where Igule can find some good local traffic policy examples besides dev central? Computation Computation is the core purpose of a program; we want it to do something.
Rossel, Thank you for the links. So, just what is a program?
f5-networks-irules
Perhaps unusually, the actual event specification forms part of the program itself. Should I use local traffic policies instead of iRules for simple instructions like shown above?
Our inability to fully predict the output of this computation when given the unlimited and unpredictable variability of possible input is the basic cause of v5 software security issues and bugs. What is a Program? It may help your understanding further if I work through the examples given prior in one go, with some example code.
The fact that multiple v5, containing code for the same event, can be assigned to a ifule virtual server only confuses things further. Multiple events of the same kind may occur even continuously but the program is only run r5 per event occurrence. The priority argument, if specified with an event or an entire iRule changes this default behaviour. He's now grateful to live in a small town in East Yorkshire in the north east of England with his wife Iirule and their four children.
In this case, the combined input, computation and output of those multiple iRules containing the same event should be considered as one program executed iirule that event occurs. More recently he's widened his skill set to embrace DevOps, Linux, containers, automation, orchestration, cloud and more. I updated this post significantly in January Others however, may not agree or have never considered this, which may cause confusion in discussion unless this viewpoint is made clear.
Even where a program runs continuously, it may still only actually execute specific code periodically or when a specific event occurs a good example is a web server which will only actually serves web pages when a request is made by a client.
F5 iRules – What is a Program?
To describe the program in everyday language. The last of four children of the seventies, Steve was born in London and has never iruel too far from a shooting, bombing or riot. Details of his F5 related books can be found here. Your email address will not be published.
Computation is the core purpose of a program; we want it to do something. Again, the definition described here helps makes irhle clearer. Comments Good information on F5.
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