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Probe question on ACE

kirit_patel
Level 1
Level 1

I have a serverfarm with four rservers defined with port 80,8080,8009. Each rserver is defined with a probe for each individual probes like TCP_80, TCP_8080 and TCP_8009

Out of these three ports only port 80 is listening. Other ports are down

When I do show serverfarm it says probe failed. why? I know 2 ports are down but port 80 is listening

20 Replies 20

Post

Show run probe

&

sh probe detail

Syed Iftekhar Ahmed

I know how to do show probe but thats not what I am asking . I have a serverfarm defined as follows. This serverfarm has only 1 server

show serverfarm 204.6.147.30-any

serverfarm : 204.6.147.30-any, type: HOST

total rservers : 1

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

----------connections-----------

real weight state current total

---+---------------------+------+------------+----------+--------------------

rserver: nj09mhe0111

172.28.8.46:0 8 PROBE-FAILED 0 0

The rserver looks like this

rserver host nj09mhe0111

ip address 172.28.8.46

probe PING

inservice

The serverfarm looks like this

serverfarm host 204.6.147.30-any

probe TCP_80

probe TCP_8080

probe TCP_40000

probe TCP_40001

probe TCP_50668

rserver nj09mhe0111

inservice

Only port 80 is running on the server but the probe fails for the serverfarm.why? We need to probe those services even though they are down

Here are the probes

probe tcp TCP_40000

port 40000

interval 5

passdetect interval 5

connection term forced

probe tcp TCP_40001

port 40001

interval 5

passdetect interval 5

connection term forced

if you define multiple probes under a severfarm then all need to pass before serverfarm is declared operational.

If you want it to fail only when all probes fail then you need to use "fail-on-all" command under server farm.

Syed

there is no fail-on-all command under serverfarm. There is failaction command. But so let me get this straight. If 4 probes are defined under serverfarm and only 1 probe is up i should use the fail-on-all command right? so where is this command under serverfarm I only see

description Configure description string for serverfarm

do EXEC command

end Exit from configure mode

exit Exit from this submode

failaction Configure action to be taken on rserver failure or removal

no Negate a command or set its defaults

predictor Configure Load Balancing Predictor Algorithm for the serverfarm

probe Associate probe with sfarm

retcode Configure http return code checking

rserver Associate server with serverfarm

transparent No virtual-address to real-address translation

Hi,

The fail-on-all option comes with ACE 2.1.0:

Quoth the manual:

"By default, real servers that you configure in a server farm inherit the probes that you configure directly on that server farm. When you configure multiple probes on a server farm, the real servers in the server farm use an OR logic with respect to the probes. This means that if one of the probes configured on the server farm fails, all the real servers in that server farm fail and enter the PROBE-FAILED state.

With AND logic, if one server farm probe fails, the real servers in the server farm remain in the OPERATIONAL state. If all the probes associated with the server farm fail, then all the real servers in that server farm fail and enter the PROBE-FAILED state. You can also configure AND logic for probes that you configure directly on real servers in a server farm. For more information, see the command in server farm host real server configuration mode.

Examples

To configure the SERVER1 real server to remain in the OPERATIONAL state unless all associated probes fail, enter the following commands:

host1/Admin(config)# rserver SERVER1

host1/Admin(config-rserver-host)# ip address 192.168.12.15

host1/Admin(config-rserver-host)# probe HTTP_PROBE

host1/Admin(config-rserver-host)# probe ICMP_PROBE

host1/Admin(config-rserver-host)# fail-on-all

To remove the AND probe logic from the real server and return the behavior to the default of OR logic, enter the following command:

host1/Admin(config-rserver-host)# no fail-on-all"

Example from my 2.1.0a system:

ace1/web2(config)# serverfarm FARM-Wibble

ace1/web2(config-sfarm-host)# ?

Configure host serverfarm:

description Configure description string for serverfarm

do EXEC command

end Exit from configure mode

exit Exit from this submode

fail-on-all Fail reals when all probes fail

failaction Configure action to be taken on rserver failure or removal

no Negate a command or set its defaults

partial-threshold Configure partial-threshold % to deactivate the sfarm

predictor Configure Load Balancing Predictor Algorithm for the serverfarm

probe Associate probe with sfarm

retcode Configure http return code checking

rserver Associate server with serverfarm

transparent No virtual-address to real-address translation

Which version of ACE software are you using?

HTH

Cathy

I am running REL_3_0_0_A1_6_3 and thats a problem i don't see that commands under rserver and serverfarm

Hi,

You will need to upgrade from 1.6.3 to version 2.1.0 or higher to use this feature.

Cathy

whats the exact release can u send me show version from your box

sh ver

Cisco Application Control Software (ACSW)

TAC support: http://www.cisco.com/tac

Copyright (c) 2002-2008, Cisco Systems, Inc. All rights reserved.

The copyrights to certain works contained herein are owned by

other third parties and are used and distributed under license.

Some parts of this software are covered under the GNU Public

License. A copy of the license is available at

http://www.gnu.org/licenses/gpl.html.

Software

loader: Version 12.2[120]

system: Version A2(1.0a) [build 3.0(0)A2(1.0a) adbuild_04:14:49-2008/04/18_/auto/adbu-rel3/rel_a2_1_throttle/REL_3_0_0_A2_1_0A]

system image file: [LCP] disk0:c6ace-t1k9-mz.A2_1_0a.bin

installed license: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Is 2.1 a safe harbor code?

Hi,

Can you please elborate the OR logic, when one probe fails all servers in the farm enter the probe failed state. does that mean no requests will be processed for that server farm?

one more question

we want a single vip to listen on multiple ports. e.g port 8010, 8111, 8112. there are 3 servers in the farm. these servers actually listen on 9010, 9111, 9112..how does the port translation happens and how will ace understand if request come for 8010 forward it to 9010 and so on.

also probing on ports 9010, 9111 and 9112 needs to be enabled and if 9010 stops listening on port 9010, only that server should be out of service for all the 3 ports. how this can be achieved

Thanks

I have written and attached a sample config for your requirement.

Above discussion doesn't hold true for your requirement. You need 3 different class-maps and policies.

Syed

The wording was a little bit misleading.

The default is that if you configure many probes and one of them fails, the rservers which didn't respond to the probe, will go down.

Only those rservers will fail. Not all of them.

With the new command provided, all probes for one rserver need to fail before that rserver is put into failed state.

Hope this helps.

Gilles.

It became misleading because in question only a single real server was used in the serverfarm :)

syed

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