Forum Discussion
Branden_Visser_
Nimbostratus
NimbostratusSwitching persistence to new member
Hello,
We have 4 members in a pool. We want to implement a way to force a session onto a particular instance if we need to (by a URL prefix), and then that session would be maintained, even if we current had another session on another member. Is this possible?
This is where we're at:
(iRule attached to our VH with dest_addr persistence profile)
when HTTP_REQUEST {
set uri [HTTP::uri]
if { $uri starts_with "/www" } {
scan $uri /www%d%s host_num path
snip the host prefix from the URI
HTTP::uri $path
redirect the request to the appropriate member
switch $host_num {
1 {
pool WWW_Pool member $ip $port
}
2 {
pool WWW_Pool member $ip $port
}
4 {
pool WWW_Pool member $ip $port
}
5 {
pool WWW_Pool member $ip $port
}
}
}
}
when HTTP_RESPONSE {
if { $uri starts_with "/www" } {
persist dest_addr
}
}
In this iRule, anything request for www.myserver.com/www4/ would be redirected to member representing www4 with URI . This works, except for the part where you need to be persisted to the chosen host. I imagine the "persist dest_addr" is no where close. My hope was for that to rewrite the persistence record for the client. Do I have to implicitly remove it first? How does one do that?
Any advice is greatly appreciated.
Thanks,
Branden
hoolioCirrostratus
Hi,
Destination address persistence works well for caching and firewall scenarios where you want all requests to one destination address to be sent to a specific pool member. In this case you want to persist based on something specific to the client. Have you tried using source address persistence with something like 'persist source_addr 255.255.255.255 300' (Click here)? If that works, you could change it to cookie insert or something more elaborate if required.
Aaron