Along the same lines off an an earlier post by Natty about persistence. I'm trying to just read a cookie that is handed out by the server and persist a user on it. One example is where the cookie is static and therefore, I thought of user mapclass2node. class nodes { "s1s1 10.11.1.10:80" "s1s2 10.11.1.20:80" } I'd like to search the request and map as appropriate. I used to do this in the pool with a select command: select mapclass2node ((http_cookie,("server")),nodes) How does this work now? Do I need to do a when HTTP_REQUEST and then some if statement. when HTTP_REQUEST { if {HTTP::cookie]} { select mapclass2node((http_cookie,("server")),nodes) }}

It's pretty simple, though not configured quite the same as the select statement on the pool. Here's what to do: class node_class { "s1s1 10.11.1.10:80" "s1s2 10.11.1.20:80" } rule direct_select { when HTTP_REQUEST { node [findclass [HTTP::cookie "server"] $::node_class " "] } } The findclass command does pretty much the same thing as the mapclass2node, returning the latter portion of the matched class entry. The node command directly selects the node.

We discovered an issue in 9.0.2 with the separator argument of the findclass command. The getfield command should be used in conjunction with the findclass command until 9.0.3 where the issue has been resolved. Updated example: rule direct_select { when HTTP_REQUEST { set server [HTTP::cookie "server"] set entry [findclass $server $::node_class] if { $entry ne "" } { node [getfield $entry " " 2] } else { log "Bad server cookie: $server" reject } } }

Thanks, I used this and it works great. rule select_on_cookie { when HTTP_REQUEST { if {[HTTP::cookie exists "server"]} { set result [findclass [HTTP::cookie "server"] $::nodes] if {$result ne ""} { node [getfield $result " " 2] } } } } class nodes { "s1s1 10.11.1.10:80" "s1s2 10.11.1.20:80" }

Hi there. I'm trying to follow your example and am having absolutley no luck. When I try to define the class in the iRule, it doesn't allow it. I created the data group that is supposed to do the same thing, but that fails as well. I am running BigIP 9.0.3 and any help would be greatly appreciated.

In the example above, this is what is stored in the system configuration file. If you are using the GUI, you will need to create a Data Group List of name "nodes" and then only include the when part of the rule. If you can explain further what you mean by "fails" we might be able to help further. A good debugging trick is to make use of the log statement to output values you are expecting to search on. In the case of this example logging the [HTTP::cookie "server"] value might help if you aren't finding an exact match. -Joe

mapclass2node | DevCentral

15 Replies

David_Zuk_10432
Nimbostratus
May 17, 2005
Thanks unRuley and Joe, I will give that a try tonight. Should I set the default pool and the default persistence profile to none?
unRuleY_95363
Historic F5 Account
May 17, 2005
That's not going to matter as the node command overrides them.
David_Zuk_10432
Nimbostratus
May 18, 2005
Well, I gave it a try last night and it doesn't seem to be using the iRule at all. In fact, in my Virtual server, if I didn't have the default persistence set to cookie, if would just follow the round robin rules of the pool. I did write the rule with the log statement, where does that log get written? Also, could this have anything to do with the http profile? Would/should I set up a custom one?

Sorry to be so stubborn and I appreciate the help.
unRuleY_95363
Historic F5 Account
May 18, 2005
The log outputs to /var/log/ltm.

Unfortunately, it's very hard for us to debug problems like this over the forum as we do not have access to your box. You may want to consider opening a case with support to help you get to the bottom of why your rule isn't being run.

Are you sure the rule is assigned to the virtual server?
David_Zuk_10432
Nimbostratus
May 20, 2005
Dear Sirs,

I must apologize for my none programming ways. The above examples did in fact work, but I was looking for the wrong thing. Where I was searching for

set server [HTTP::cookie "server"]

I should have been searching for

set server [HTTP::cookie "SERVER"]

I found this out by adding a log statement to tell me what it was finding. I also looked into what the IIS servers were sending out. I appreciate all your help and I have learned a lot from this excersize. And Joe, I would really like to see that list of commands when you get it completed. Thanks again everyone.

Dave

Forum Discussion

mapclass2node

15 Replies

Recent Discussions

Disk space full - what files, folders are safe to delete?

ASM instance creation

BIG-IP DNS: Check Status Of Multiple Monitors Against Pool Member

Open Redirection Mitigation

F5Access | MacOS Sonoma

Related Content

mapclass2node

mapclass2node, imid and wlnode

Weblogic JSESSIONID Persistence BIG-IP v4

Re: CPU utilization upon adding irule condition

node select expression