Forum Discussion
AlexS_yb
Cirrocumulus
CirrocumulusMy stick session
Hi
The system has multiple tomcat stype containers, they provide a JSESSIONID and we append a node id to the end
so we have a JSESSION id that looks like
JSESSIONID=83987345.nodeX where X could 1 2 3 4 5
on my nginx setup i had
server app1.env:XXXX slow_start=0s weight=1 max_fails=0 fail_timeout=10 route=node1;
server app2.env:XXX slow_start=0s weight=1 max_fails=0 fail_timeout=10 route=node2;
# Session Persistence based on JSESSION ID, if necessary
sticky route $route_cookie;
# jboss mapping for nodes
map $cookie_jsessionid $route_cookie {
~.+\.(?P<route>\w+)$ $route;
}
I want to do this in F5 i presume with F5.
But ... the persistence model in F5 break my nginx setup.
so
client A -> connect talks to node1
JSESSIONID 123456789.node1
node1 dies
client A -> get rerouted to node2
JSESSIONID 123456789.node1...
JSESSIONID 987654321.node1
note 100% sure if the jsessionid changes or not. but i'm 100% sure that the nodeX stays the same
until node1 comes back client gets routed to node2
once node1 comes back the client is routed back to node1
I presume irule.
but how do I say go to pool member if its up otherwise go to pool (use the balancing method)
- xuwen
Cumulonimbus
pool_node1 member 10.1.1.10:80 monitor tcp
pool_node2 member 20.1.1.20:80 monitor tcp
pool_default member 10.1.1.10:80 20.1.1.20:80 monitor tcp
iRuels code:
when RULE_INIT {
array set static::pool_array {
1 pool_node1
2 pool_node2
}
}
when HTTP_REQUEST {
if { [HTTP::cookie exists "JSESSIONID"] } {
set node_x [findstr [HTTP::cookie "JSESSIONID"] "node" 4 1]
log local0. "node_x is $node_x"
if { [active_members [lindex [array get static::pool_array $node_x] 1]] == 0 } {
pool pool_default
} else {
pool [lindex [array get static::pool_array $node_x] 1]
}
} else {
pool pool_default
}
}
AlexS_ybThink I like this. but modified
I will create singleton pools for each member and 1 pool with all members.
then
if I have no JSESSIONID or no NODE
then go to the generic pool
other wise
test to see if pool with 1 node corresponding to the NODE1 is available
if yes then send it
if no then send to generic pool
Hello Alex.
You could configure an iRule that routes traffic base on the "nodeX" value of the JSESSIONID cookie, checking first if this specific member is UP using "active_members" command.
https://clouddocs.f5.com/api/irules/active_members.html
Config details.
- Create an iRule
- create a generic pool with all members
- create specific pools with only one member (let say, node1, node2, ...)
iRules steps:
- Get the "nodeX" value.
- if "[active_members pool_nodeX] == 0" use generic pool
- if "[active_members pool_nodeX] > 0" use specific pool (pool_nodeX)
Hope this helps you.
Regards,
Dario.
- AlexS_yb
thanks i will check that out
