Can I run TMSH commands inside an iRule?

[mahanth]

I have added:     

set NODENAME [HTTP::header value test]

 POOLMEMBER_IP=($(tmsh list ltm node $NODENAME | grep "address" | awk '{print $2}'))

1) I am trying to run tmsh commands using/in iRule

2) Trying to get just the Node IP from Node Name

[Dario_Garrido]

Hello Mahanth.

I think you are mixing concepts. Take into account this:

• TMSH are management plane scripts
• iRule are dataplane scripts.

So, you cannot access a F5 config using iRule commands.

One idea that you could use is to resolv your server hostname using your DNS.

[lindex [RESOLV::lookup $hostname] 0]

REF - https://clouddocs.f5.com/api/irules/resolv__lookup.html

Regards,

Dario.

[Rene_C_]

Please note that with v15 RESOLV::lookup is deprecated and no longer supported!

[Dario_Garrido]

https://clouddocs.f5.com/api/irules/RESOLVER__name_lookup.html

https://clouddocs.f5.com/api/irules/DNSMSG__record.html

[Rene_C_]

which just includes that it can no longer be written nicely on one line...or 2...or 3... 🙂

[JRahm]

deprecated just means it is marked for removal in a future version. As long as it's still available it will be supported.

[Rene_C_]

Trust me, with v15 you dont want to use that anymore, unless you are ready for core dumps....

[Dario_Garrido]

I guess you mean this:

https://cdn.f5.com/product/bugtracker/ID916753.html

It's a problem with the object name resolution, but it has workaround.

[Rene_C_]

Yeah, thats the one we raised. And it has a workaround but its not so easy to implement depending on the environment you have, since we have a complete custom dev cycle for irules. But, well.

[JRahm]

Ok fair enough, Rene! 😃

But generally, deprecated doesn't mean immediate death sentence. Test, test, then test some more, and as I recommend with any new release, comb the release notes and if there is a better way forward with any implementation, iterate through those updates as resources allows.