i have 4 Servers at a pool , persistence is source IP 3 servers went down , so all connections went to Server1 , when the 3 servers came back all the old connections didn't go to them & continued on Server1 i know that only new connections will go to them , but the idea is that i want even the new connections to be re-load balanced across all How can i achieve that ? is there an option @ GUI or Irule is needed ?

Correting : i have 4 Servers at a pool , persistence is source IP 3 servers went down , so all connections went to Server1 , when the 3 servers came back all the old connections didn't go to them & continued on Server1 i know that only new connections will go to them , but the idea is that i want even the old connections to be re-load balanced across all How can i achieve that ? is there an option @ GUI or Irule is needed ?

If there was even a way to do this, wouldn't moving a connection from one server to another break the application? I assume there is a reason you do persistence?

likely an iRule for this..you could track the number of available pool members and anytime there is an increase from the last check, you could remove persistence so they'll reshuffle.

brain isn't quite moving yet this morning, but this might get you started. basically sets the active pool member count to a variable every 60s, and when a client connects, if its check of the current count is greater than the last count, it'll remove persistence for those clients connecting in the minute where a new pool member was added to the active list. That's the theory anyway. when RULE_INIT { after 60000 -periodic { set static::counter [active_members /partition/pool] } } when CLIENT_ACCEPTED { if { [active_members /partition/pool] > $static::counter } { persist none } }

Thx all here is my issue: i have users connecting to application server , then application server connects to database server i have around 50 application servers & 5 database servers application servers connects to databsae server using 1 TCP connection ( for ex if 10 users connected to application server 1 , thsi application server1 will have one connection with DB serving all of them ) Now , 3 of DB servers went down , so all connections went to DB Server1 , when the 3 DB servers came back all the old connections didn't go to them & continued on Server1 i know that only new connections will go to them ( but at my case case here there will not be new connections because application server has one TCP connection with DB server serving all users ) , so How can i solve that & force re-load balancing ? The When CLIENT_ACCEPTED Irule will be applied only with 3 way Handshake ( new connections )

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SSHSSH_97332

Nimbostratus

Oct 31, 2013

IRule to Re-load Balance

i have 4 Servers at a pool , persistence is source IP 3 servers went down , so all connections went to Server1 , when the 3 servers came back all the old connections didn't go to them & continued on Server1 i know that only new connections will go to them , but the idea is that i want even the new connections to be re-load balanced across all How can i achieve that ? is there an option @ GUI or Irule is needed ?

14 Replies

JRahm

Admin

Oct 26, 2015

@Jesse, you can use the eval command to bypass the syntax validator in this case:

when RULE_INIT {
  set static::member_cmd "active_members /partition/pool"
  set static::counter [eval $static::member_cmd]
}

Jesse_48456
Historic F5 Account
Oct 26, 2015
Hi Jason, Running 11.5.3 but, thank you so much for the reply!

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IRule to Re-load Balance

14 Replies

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