question on mod_wl_ohs.conf and apps.conf

[Sri]

Hi Erman,

we have 2 application nodes with a load balancer in front of them.In node 1 mod_wl_ohs.conf,we have entries corresponding to node 1 alone and similarly in node 2 mod_wl_ohs.conf as entries corresonding to node 2 alone.Is this right or do we need to have all the entries of both the nodes in each file irrespective of the nodes

mod_wl_ohs.conf in EBS_web_UATDB_OHS1
-------------------------------------------------------------------------

<Location /OA_HTML> 
SetHandler weblogic-handler
WebLogicCluster erpuatapp01.ttd.com:7203,erpuatapp01.ttd.com:7202<<do we need to have all 4 oacores here?
WLTempDir ${ORACLE_INSTANCE}/tmp

mod_wl_ohs.conf in EBS_web_UATDB_OHS2
-------------------------------------------------------------------------

<Location /OA_HTML> 
SetHandler weblogic-handler
WebLogicCluster erpuatapp02.ttd.com:7202,erpuatapp02.ttd.com:7208<<do we need to have all 4 oacores here?
WLTempDir ${ORACLE_INSTANCE}/tmp

Thank you

[ErmanArslansOracleBlog]

Hi,

Normally "mod_wl_ohs.conf  will contain entries of managed servers from all Application tier nodes".
So I expect to see all your 4 oacores there..

1)Is DynamicServerList=on in your mod_wl_ohs.conf?
2)How did you do this setup? Which documentation you followed?
3)Did you test this? I mean what happens when you shut down these oacore: "erpuatapp01.ttd.com:7203,erpuatapp01.ttd.com:7202" ?

[Sri]

Hi Erman,

Thanks for the update.Dynamic ServerList is off and attached both the files for your reference.

Thank you

[Sri]

wls_ohs.txt

[ErmanArslansOracleBlog]

Please answer the following questions as well:

2)How did you do this setup? Which documentation you followed?
3)Did you test this? I mean what happens when you shut down these oacore: "erpuatapp01.ttd.com:7203,erpuatapp01.ttd.com:7202" ?

[Sri]

Hi Erman,

But we have a load balancer using round robin algorithm,so it will direct the first connection to first node where mod_wls_ohs.conf was present and from there it will be distributed to available oacores on that node

second connection will be directed to second node where mod_wls_ohs.conf was present and from there it will be distributed to oacores on that node

please correct me what is the issue with current configuration

[ErmanArslansOracleBlog]

If your HTTP server 1 is up , but oacore servers on Node 1 are down, what will happen??
Answer yourself

[Sri]

Thanks for the update erman,

requests sent to that node will error out

[ErmanArslansOracleBlog]

Test this -> what happens when you shut down these oacore: "erpuatapp01.ttd.com:7203,erpuatapp01.ttd.com:7202" ? -- while your HTTP Server 1 is up (don't shutdown HTTP Server 1)

[Sri]

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[ErmanArslansOracleBlog]

You didnt shutdown HTTP Server 1 right?
Did you test that login page several times? (test 5-6 times)

[Sri]

Hi Erman,

After testing several times,Not able to access the url

No backend server available for connection: timed out after 10 seconds or idempotent set to OFF or method not idempotent.

So,if i add these secondary nodes oacores in my config file,then will ohs redirect to those oacores on secondary node

Thanks

[ErmanArslansOracleBlog]

First, implement this ->12.2 E-Business Suite HTTP Server Tier Is Fowarding Request To Shut Down Oacore Servers Resulting "Failure of server APACHE Bridge error" Due To Incorrect Setup of mod_wl_ohs.conf (Doc ID 2172924.1)

Then, retest (multiple times) and update me.

[Sri]

Thanks erman,

We will make the changes and let you know..every time you are really helpful

between,the second node was up with all the services but i dont understand why i am not getting the login page.

Load balancer should redirect the connection to second node right?hope you got my concern

Thank you

[ErmanArslansOracleBlog]

That was my concern ..
If your HTTP server is up on node 1 while your managed servers are not running on node1 , then Load Balancer may still send the requests to node 1 and you will fail..
Your test shows that! (No backend server available for connection: timed out after 10 seconds or idempotent set to OFF or method not idempotent. )

[Sri]

Thanks erman,

when i enter the url multiple times,load balancer should direct login page to apache on second node right?i mean round robin fashion

please correct me if i am wrong

[ErmanArslansOracleBlog]

Yes! but "If your HTTP server is up on node 1 while your managed servers are not running on node1 , then Load Balancer may still send the requests to node 1 and you will fail"

[Sri]

yes erman,

I have almost clicked the login url 10 times,but every time i got the error,that means my load balancer also has some issue it seems.I think it was always redirecting to node 1 only

[Sri]

Erman,

do we have to make any changes in apps.conf as well?attached the files for your reference.Not sure exactly how this file is used internally.can you please clarify

Thank youapps.conf

[ErmanArslansOracleBlog]

Sri,

Please proceed in sequence..

First, implement this ->12.2 E-Business Suite HTTP Server Tier Is Fowarding Request To Shut Down Oacore Servers Resulting "Failure of server APACHE Bridge error" Due To Incorrect Setup of mod_wl_ohs.conf (Doc ID 2172924.1)

Then, retest (multiple times) and update me.