v10 - local vs. global vars

I haven't used the TCL 'global' command before. Per the TCL wiki page on the command, I don't think it could be used in current versions of iRules as there is no support for procs in iRules as of now:

 

 

 

http://www.tcl.tk/man/tcl8.4/TclCmd/global.htm

 

This command has no effect unless executed in the context of a proc body.

 

 

 

If you did want to declare a global variable, you could use 'set ::my_global_var' and then reference it using $::my_global_var. However, I don't think you want to use a global variable in the scenario you've described. If you want to set a variable for one client connection and access the variable later in the same iRule or in another iRule on the same VIP, you could use a local variable. Using a global variable means that all client connections will reference the same variable. If one HTTPS connection was established and then another client established an HTTP connection, the HTTP connection would set the global variable to "http" for itself and any prior requests that were still established.

 

 

See this post for some additional info:

 

 

http://devcentral.f5.com/Default.aspx?tabid=53&view=topic&postid=85746&ptarget=85747

 

 

Aaron