This lab is also based on the lab setup I am using.
This time I'll do the same, but with AppShape++, which is similar to F5's iRules.
I want a2.dans-net.com to be served by SRV1 and b2.dans-net.com to be served by SRV2, any other host should be served by all web servers.
I'll use VIP 10.86.3.10 as the VIP. Here is how I edit my /etc/hosts files, which is c:\windows\system32\drivers\etc\hosts :
10.136.6.10 a2.dans-net.com
10.136.6.10 b2.dans-net.com
/c/slb/group a2_dans
add 1
/c/slb/group b2_dans
add 2
Next I'll write the AppShape++ script which will select a group based on the Host header:
attach group a2_dans
attach group b2_dans
when HTTP_REQUEST {
switch -glob [HTTP::host] {
"a2.dans-net.com" {
group select a2_dans
}
"b2.dans*" {
group select b2_dans
}
default {
group select 10
}
}
}
-----END
The first two lines are attach statements. I have no idea why they are needed. All I know that any group referenced inside other parts of the script must be declared there.
Then, with the help of the switch command we select which group to use when using this host or the other. If the Host matches nothing, then we will use group #10, which includes all the web servers.
Lets import the script into Alteon. Notice the "-----END" at the end, which marks the end of the script.
/c/slb/appshape/script group_by_host
ena
import text
attach group a2_dans
attach group b2_dans
when HTTP_REQUEST {
switch -glob [HTTP::host] {
"a2.dans-net.com" {
group select a2_dans
}
"b2.dans*" {
group select b2_dans
}
default {
group select 10
}
}
}
-----END
Next lets configure the VIP, or virt in Alteon's terminology.
/c/slb/virt 6_10
ena
vip 10.136.6.10
/c/slb/virt 6_10/service 80 http
/c/slb/virt 6_10/service 80 http/appshape
add 10 group_by_host
Success!
So which is better? Using Content Rules or use AppShape++ scripts.
I think that once you learn it, AppShape++ scripts are much easier as you you always use the same TCL commands and you are not forced in awkward configurations which at the end mimic that short script.
