iRule that redirects to Sorry Pool when pool is down

for maintenance page, i think we should use HTTP_REQUEST event and HTTP::uri command in addition to pool command since we may have to change url when sending to maintenance pool. and i do not think we need to save default pool name in CLIENT_ACCEPTED event.

e.g.

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b pool foo list
pool foo {
   monitor all fake
   members 200.200.200.101:80 {}
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
   if {[active_members [LB::server pool]] < 1} {
      HTTP::uri /
      pool sorrypool
   }
}
}
[root@ve10:Active] config  b pool sorrypool list
pool sorrypool {
   members 200.200.200.102:80 {}
}

 default pool is down

[root@ve10:Active] config  b pool foo|grep -i pool
POOL foo  LB METHOD round robin   MIN/CUR ACTIVE MEMBERS 0/0
+-> POOL MEMBER foo/200.200.200.101:80   inactive,down

 client accesses virtual server and is sent to sorrypool instead

[root@ve10:Active] config  ssldump -Aed -nni 0.0 port 80 and not host 200.200.200.10
New TCP connection 1: 172.28.19.251(44474) <-> 172.28.19.79(80)
1345898352.5804 (0.0009)  C>S
---------------------------------------------------------------
HEAD /something HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Host: 172.28.19.79
Accept: */*

---------------------------------------------------------------

New TCP connection 2: 200.200.200.80(44474) <-> 200.200.200.102(80)
1345898352.5875 (0.0070)  C>S
---------------------------------------------------------------
HEAD / HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Host: 172.28.19.79
Accept: */*

---------------------------------------------------------------

just my 2 cents.

So, my iRule is as follows:

 

 

when HTTP_REQUEST {

 

if {[active_members [LB::server pool]] < 1} {

 

HTTP::uri /

 

pool sorrypool

 

}

 

}

 

 

 

This works fine and when all pool members are down or unavailable, requests are sent to the 'sorrypool'. however, once the pool member(s) are available again, all requests are NOT being sent to the main pool again. I'm pretty sure this is due to persistence being set on the main Virtual IP, but we need it on that Virtual IP. This is obviously not acceptable for my site. How do I force requests back to the original pool once the pool members are available again; basically having requests follow the iRule.

 

 

Thanks.

Hi Jason,

Can you try this version which assigns a pool in all cases and logs the results?

when CLIENT_ACCEPTED {
set sorry_debug 1
set default_pool [LB::server pool]
}
when HTTP_REQUEST {
if {[active_members $default_pool] < 1} {
if {$sorry_debug}{log local0. "[IP::client_addr]:[TCP::client_port]: Using sorry pool for [HTTP::uri]"}
HTTP::uri /
pool sorrypool
} else {
if {$sorry_debug}{log local0. "[IP::client_addr]:[TCP::client_port]: Using pool $default_pool for [HTTP::uri]"}
pool $default_pool
}
}
when SERVER_CONNECTED {
if {$sorry_debug}{log local0. "[IP::client_addr]:[TCP::client_port]: Connected to [LB::server] - [IP::server_addr]:[TCP::server_port]"}
}

Aaron

I have tried these i'm using 11.3 and have no luck on making them work in my setup

I have tried these i'm using 11.3 and have no luck on making them work in my setupwhat is not working indeed?