Data Groups for dummies

Posted By hoolio on 03/18/2011 08:47 AM

Hi Kent,

That looks like a great start. You don't actually have to iterate through the datagroup manually to do a starts_with comparison. You can use class search to do this:

when RULE_INIT {

 Log debug to /var/log/ltm? 1=yes, 0=no
set static::debug 0
}
when CLIENT_ACCEPTED {

 Save the VS default pool name before it's changed
set default_pool "defpool01"

 set the data group name
set clname "AppVersion[virtual name]"
}
when HTTP_REQUEST {

 if there isn't a data group with the above name, set the pool to default and exit
if {[class exists $clname]} {

 Search the datagroup for a name that starts with the URI
set pool_name [class search -value $clname starts_with [HTTP::uri]]

if { $pool_name eq ""} {
 we don't match the context roots in the data class
if { $static::debug } { log local0. "fell through to the default pool" }
pool $default_pool
} else {
if { $static::debug } { log local0. "Matched $app_pool" }
pool $app_pool

}
} else {
if { $static::debug } { log local0. "Data group $clame not found, using default_pool $default_pool" }
pool $default_pool
}
}

Aaron

I'm back. I am testing this iRule and it does not appear to work. The pool_name variable does not appear to be set if my URI is, as I put it on the command line, ends with a / For example, if my data group looks like:

/foo2_1 := foo21
/foo2_2 := foo22

and I try to hit the virtual server with curl like this, curl http://10.10.10.100/foo2_1/, pool_name does not get set, and I fall through to the default pool, but nothing happens and the connection gets reset by peer. FYI, this is running on LTMVE, 10.2.0. Now, I don't think the connection getting reset has anything to do with the iRule. Is there anyway to see inside the line "set pool_name [class search -value....]" to find out what it happening there? If I add the trailing slash to the data group, /foo2_1/ instead of /foo2_1, pool_name sets set.

Also, app_pool is not used anyplace but in the log statement and where you set the pool to $app_pool. I have changed that to $pool_name.

Again, thanks for your help!

Kent