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Kevin_M_182964's avatar
Kevin_M_182964
Icon for Nimbostratus rankNimbostratus
Feb 10, 2015

Can health monitor maintain TCP connection?

Can a TCP health monitor check be configured such that the load balancer maintains a persistent TCP connection with the pool members? I have a send string for a TCP health check, but our development...
application delivery
availability
LTM
Kevin_K_51432's avatar
Kevin_K_51432
Historic F5 Account
Feb 10, 2015

Oops, I didn't see the "in conjunction". Well, it may be worth considering if this can be used in conjunction with an ICMP (or ping) monitor?

 

I'll be sure to update this if something more fitting shows up.

 

Thanks, Kevin

 

Kevin_K_51432's avatar
Kevin_K_51432
Historic F5 Account
Feb 10, 2015
I did set this up to answer the question "so there are no responses to check to mark it as up again" and have found that the response to the client is the object parsed by the iRule (not the monitor traffic) and the pool member becomes down. Then the monitor comes around and marks it back up until another client request is parsed and marks the member down again. Note: I set the iRule to trigger on 200 OK to make this easier. Client connection results: HTTP/1.1 200 OK Date: Tue, 10 Feb 2015 22:00:48 GMT Server: Apache/2.2.22 (Ubuntu) MISS MISS HTTP/1.1 200 OK Date: Tue, 10 Feb 2015 22:00:48 GMT Server: Apache/2.2.22 (Ubuntu) MISS MISS ------------------------------------------------------------------ What is logged to /var/log/ltm: notice mcpd[6987]: 01071681:5: SNMP_TRAP: Virtual /Common/me2 has become available err tmm[10521]: 01010221:3: Pool /Common/test1 now has available members err tmm[10521]: 01010028:3: No members available for pool /Common/test1 notice mcpd[6987]: 01070638:5: Pool /Common/test1 member /Common/10.12.23.27:80 monitor status iRule down. [ /Common/gateway_icmp: up ] [ was up for 0hr:0min:0sec ] notice mcpd[6987]: 01071682:5: SNMP_TRAP: Virtual /Common/me2 has become unavailable notice mcpd[6987]: 01070727:5: Pool /Common/test1 member /Common/10.12.23.27:80 monitor status up. [ /Common/gateway_icmp: up ] [ was iRule down for 0hr:0min:1sec ] notice mcpd[6987]: 01071681:5: SNMP_TRAP: Virtual /Common/me2 has become available err tmm[10521]: 01010221:3: Pool /Common/test1 now has available members err tmm[10521]: 01010028:3: No members available for pool /Common/test1 notice mcpd[6987]: 01070638:5: Pool /Common/test1 member /Common/10.12.23.27:80 monitor status iRule down. [ /Common/gateway_icmp: up ] [ was up for 0hr:0min:0sec ] notice mcpd[6987]: 01071682:5: SNMP_TRAP: Virtual /Common/me2 has become unavailable notice mcpd[6987]: 01070727:5: Pool /Common/test1 member /Common/10.12.23.27:80 monitor status up. [ /Common/gateway_icmp: up ] [ was iRule down for 0hr:0min:1sec ]