Load balancing check

could anyone tell me what is load balancing check..! its urgent.
Best regards!

Depends of the subject.
The load balancing is a method of distribution of the queries between servers.
Fred

Similar Messages

Load balancing problem

We need a load balancing setup that share the load for many web applications on multiple backend servers, but we don’t want the web apps to be activated on all backend servers at the same time. We want to configure all apps as “lazy” on all backend servers. They will then be activated when the first request to their DNS is made. Then the app is started on that backend server.
We have hundreds of apps and each backend server will become very slow if all apps are activated on all backend servers. The preferred solution would therefore be to not call all DNS names on all backend servers but to share the balance based on the DNS name in the requests. Sticky-session or sticky source-IP won’t be enough to solve this as they only stick to each user session.
If User-A request www.siteA.com he may be redirected to backend server 1 and then be kept there. But if User-B then requests the same www.siteA.com he may be redirected to backend server 2 and then be kept there. This means that the web application for siteA will be activated and loaded in both the backend servers. When we host hundreds of sites this will be a problem. We may have hundreds of backend servers but they will all end up loading all web apps over time and get out of memory.
The theory to get this work is a load balancer with the following logic:
1.     A request for a certain DNS comes in. For example: www.siteA.com
2.     Load balancer checks if this certain DNS has been redirected to a certain backend server before and if this server is alive
2.1.     (If not redirected before): Redirect the request to the backend server with least load. Store the selected backend route based on the DNS name.
2.2.     (If redirected before): Redirect the request to the assigned backend server for siteA.
3.     If a backend server is down then all DNS requests to this server will be redirected to another backend server with least load. All requests to these DNS names will be assigned to this backend server instead.
h3. Example of set up
Many DNS to one IP
192.168.1.1 www.siteA.com
192.168.1.1 www.siteB.com
192.168.1.1 www.siteC.com
Frontend load balancer
192.168.1.1 (load balancer)
Backend app servers
192.168.2.2 (App server 1)
192.168.2.3 (App server 2)
192.168.2.4 (App server 3)
h3. Snapshot of servers during load
App server 1
www.siteA.com (Activated)
www.siteB.com (Lazy)
www.siteC.com (Lazy)
App server 2
www.siteA.com (Lazy)
www.siteB.com (Activated)
www.siteC.com (Lazy)
App server 3
www.siteA.com (Lazy)
www.siteB.com (Lazy)
www.siteC.com (Activated)

Only from load balancing point of view cluster is not really needed.
apart from session replication and failover capabilities, few more benefits are there with clustering only if you are using a web server also.
Stuck threads can be due to lot's of problems like application issues, load issues etc, So first make sure you are getting stuck thread on both servers or only on one, if on one, then in this case your load balancing not working properly and sending more load to that server, and if you are getting stuck threads on both then try to add one more managed server.
Regards
Mukesh Negi
http://weblogicserveradministration.blogspot.com

How can I support a health check, from a load balancer?

My company has load balancers which use health checks to determine if the end point is available for client traffic. The basic health check is a tcp ping, and will tell you if the device is on the network. The next level of health check is an http request. This request, and the response are static, you can’t create your own version of the request and response. The standard request is this:
     http://host:port/healthcheck/hc.html
The standard response is this:
     “The server is available”
I want to use the load balancer as part of my total deployment. The problem is that I am not seeing how to support this health check request and response in the MDEX engine. What I see is this request
     http://host:port/admin?op=ping
Will return this response
     dgraph <host>: <port> responding at <day month year time>
It is nice that there is a built in ping, but I am not able to make use of it. I am new to Endeca and still poking around. The dgraph process listens on a port set up in <…>/config/script/AppContext.xml
<dgraph id="Dgraph1" host-id="MDEXHost" port="3281">
<properties>
<property name="restartGroup" value="A" />
<property name="updateGroup" value="a" />
</properties>
<log-dir>./logs/dgraphs/Dgraph1</log-dir>
<input-dir>./data/dgraphs/Dgraph1/dgraph_input</input-dir>
<update-dir>./data/dgraphs/Dgraph1/dgraph_input/updates</update-dir>
</dgraph>
(I am not using the default port, as I only have an instance on a shared server and have to worry about port clashing. But that is a different thread.)
In a standard tc Server install I can support this health check by doing this:
* Create a directory named “healthcheck”, in the “webapps” directory.
* Place a file name “hc.html” in that directory, which contains “The server is available”
The one hack which comes to mind is to write a servlet which would be able to be a smart proxy for the load balancer health check. It would pass along any regular traffic to the MDEX engine. But if the request was a health check it would send “admin?op=ping” to the MDEX engine, and for a good response from the engine, create and pass back the correct response to the load balancer.
Ideas, comments, flames, …
Thanks

Hi, we are using following String to test the MDEX ping response but we get the invalid version formation on dgraph.log -
following is on F5
GET /admin?op=ping HTTP/1.1/r/nHost:myhost.endeca.com:19000/r/nConnection:close/r/n/r/n
Following gets logged on Dgraph.log
WARN 09/05/12 05:30:03.799 UTC (1346823003799) DGRAPH {dgraph} Invalid version format in 'HTTP/1.1/r/nHost:myhost.endeca.com:19000/r/nConnection:close/r/n/r/n'
Please let me know - if you have any suggestions to solve this issue.
I know that it works from browser and wget from unix with following commands.
wget http://myhost.endeca.com:19000/admin?op=ping - from unix command line
from browser:
http://myhost.endeca.com:19000/admin?op=ping
Thanks,
Ram

Load Balancing Health Check Probes

Are these values correct for setting up a load balancer with Exchange 2013 Layer 7? Trying to go over this article from Ross Smith:
http://blogs.technet.com/b/exchange/archive/2014/03/05/load-balancing-in-exchange-2013.aspx
OWA: https:/mail.company.com/owa/healthcheck.htm
ECP: https://mail.company.com/ecp/healthcheck.htm
EWS: https://mail.company.com/ews/healthcheck.htm
EAS: https://mail.company.com/Microsoft-Server-ActiveSync/healthcheck.htm
OAB: https://mail.company.com/OAB/healthcheck.htm
RPC: https://mail.company.com/rpc/healthcheck.htm
MAPI: ?
AutoD: https://autodiscover.company.com/Autodiscover/healthcheck.htm
MCITP Exchange 2010 | MCTS Exchange 2007 | MCITP Lync Server 2010 | MCTS Windows 2008 | MCSE 2003

Easy enough to check. Paste each into a browser. If you get a 200 response ( assuming the health probes are active), then you know you are using the correct URLs.
If you are using 2013 SP1 and have MAPI/HTTP enabled it would be https://mail.company.com/mapi/healthcheck.htm
Twitter!: Please Note: My Posts are provided “AS IS” without warranty of any kind, either expressed or implied.

CSS load balancing, service dependancy condition check

Hi,
I would like to seek some advice regarding the CSS's service configuration.
Is there a way to configure the CSS such that it check for the condition/status of a independant service (not involved in the load balancing algorithm) is alive/down (using service mode keepalive port/type), before deciding whether to/not to load balance to a group of services?
Senario is as follwows:
We process incoming HTTPS request and load balance to 2 HTTPS Servers (HTTPS service SSL1 and SSL2), on condition that a independent service (HTTPS service SSL3) is alive (using the keepalive type/port check in service mode).
If the independant service (HTTPS service SSL3) is not alive, remove the HTTPS Servers (HTTPS service SSL1 and SSL2) from the load balancing algorithm.
Thanks in advance for assistance
!************************** CIRCUIT **************************
circuit VLAN1
ip address 192.168.103.35 255.255.255.192
!************************** SERVICE **************************
service SSL1
ip address 192.168.103.53
protocol tcp
port 443
keepalive type tcp
keepalive port 443
active
service SSL2
ip address 192.168.103.54
protocol tcp
port 443
keepalive type tcp
keepalive port 443
active
? This is the service condition that CSS will check before deciding to/not to load balance to SSL1 and SSL2.
? If SSL3 is down, do not load balance to SSL1 and SSL2. If SSL3 is up, load balance to SSL1 and SSL2
service SSL3
ip address 192.168.103.55
protocol tcp
port 443
keepalive type tcp
keepalive port 443
active
!*************************** OWNER ***************************
owner CISCO
content L5Rule_SSL
vip address 192.168.103.37
application ssl
protocol tcp
port 443
url "/*"
add service SSL1
add service SSL2
active
!*************************** GROUP ***************************
group SSL
vip address 192.168.103.37
add destination service SSL1
add destination service SSL2
active

maybe this?
circuit VLAN1
ip address 192.168.103.35 255.255.255.192
ip virtual-router 10 priority 100
ip redundant-vip 10 192.168.103.37
ip critical-service 10 SSL3
if I'm not mistaken the vip 192.168.103.37 will stop working when the service SSL3 goes down. I'm not sure that this is what you want though...

Forms Services availability checking for BIGIP Load Balancer

We are load balancing across a number of 10.1.2.2 Forms servers using a BIGIP load balancer. Currently our load balancing is done based on which server has the "least connections" to the BIGIP. So far we have been using the following test URL to allow BIGIP to check the availability of the Forms Services on each server.
http://server:port/forms/frmservlet?ifcmd=status
This works well however it only checks through to the HTTP level within Forms Services. We encountered a problem when the Forms Services failed to work on a particular server however the above URL showed that everything was OK. The effect of this was that all new users attempting to login were directed to the failed server as this server had the "least number of connections".
After raising an SR with Oracle they advised that the forking of runtime processes had probably failed and this was not detectable by the load balancer with the above URL. So they have recommended a number of options for checking the status of the Forms Services. These are:
a) http://server:port/forms/frmservlet
This loads the default Form and therefore by definition tests the forking of runtime processes. However BIGIP is unable to automatically process the information to distinguish whether the service is up or down. Oracle recommended that if using this method we would need to customise BIGIP to handle the various FRM-xxxx error codes.
b) http://server:port/forms/frmservlet?userid=scott/tiger@YOURDB&form=yourtestform.
fmx
Even more thorough would be to actual log on to the database using a test form as above.
My question is does anyone out there have experience in checking Forms Services availability using these last two methods as I'm not sure how to customize the load balancer so that it can handle the output of these URLs. Also when using the original URL is it normal to load balance using a "least connections" method or do people out there use a different algorithm.
Thanks for any help/advise that you can give.
Regards,
Philippe

Well SR followed up and it looks like the only course of action is to use the standard HTTP check: http://server:port/forms/frmservlet?ifcmd=status ...
... unless that is you want to do some serious customisation. Oracle don't support any other form of checking.
I'm guessing from the lack of responses to this thread that this hasn't been an issue for anybody else ... ???
Any thoughts/suggestions really welcome as we go into production in 4 weeks.
a) What do people recommend for load balancing Forms ... least connection, round robin ... ?
b) Do people use http://server:port/forms/frmservlet?ifcmd=status or have some of you used something else?
Thanks,
Philippe

Health check for load balancing ALSB/OSB instances

What is the standard practice for a load balancer sitting in front of ALSB/OSB instances as far as a health check? I'm working with our IS department to implement a valid health check. Currently the load balancer (older model cisco device) is just checking for an active port which is generating excessive logging on the ALSB side. As a workaround I'm just going to have the loadbalancer check for a http 200 response and a greater than zero body size.
thanks in advance...

it depends on the type of load balancer what it can do. I suggest create a 'empty' proxy service that does not have logging or auditing. Publish the prox and use this webservice in your load balancer to check if the service is available.
Marc

Load Balancing Health Checks

I am looking for per-protocol health checks to work with a Netscaler load balancer for Exchange 2010. I have the one for OWA working (see below), but I cannot seem to find anything else on the other protocols (ECP, EWS, OAB, AS, etc.). Does anyone have this
information? Citrix website is less then helpful.
OWA health check:
Custom header: Agent: Mozilla/4.0\r\nHost: FQDN\r\n
Send String: GET /owa/auth/logon.aspx?url=https://FQDN/owa/&reason=0
Receive String: Outlook
MCITP Exchange 2010 | MCTS Exchange 2007 | MCITP Lync Server 2010 | MCTS Windows 2008 | MCSE 2003

Hi,
Ways to locate the IIS log on your CAS/FE server:
http://social.technet.microsoft.com/Forums/exchange/en-US/935eeb5b-d996-4933-9cbd-0347ebad801d/how-can-i-view-exchange-iis-logs?forum=exchange2010
Thanks,
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Simon Wu
TechNet Community Support

How to check the load balancing in Oracle 11gR2 2 node RAC

Dear All,
Can any one please assist me how to check whether the incoming connections are evenly distributing across the nodes..?
We have two nodes, when we check the sessions counts in both nodes, Most of the time we could see node -1 has more no of sessions than node-2..? So just wanted to know whether load balancing is happening or not ...? If not how to enable it and distribute the incoming connections evenly..?
Oracle 11gR2 / RHEL5

SQL> select inst_id,count(*) from gv$session where username is not null group by inst_id;
INST_ID COUNT(*)
1 43
2 40
Not sure how to check the users are connecting through scan or not ..? But below are scan setttings...
SQL> !srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:1521
SQL> !srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node za-rac-prd-02
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is running on node za-rac-prd-01
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is running on node za-rac-prd-01
SQL> !srvctl config scan
SCAN name: rac_prd.abc.local, Network: 1/10.100.130.0/255.255.255.192/eth6.64
SCAN VIP name: scan1, IP: /rac_prd.abc.local/10.100.130.55
SCAN VIP name: scan2, IP: /rac_prd.abc.local/10.100.130.54
SCAN VIP name: scan3, IP: /rac_prd.abc.local/10.100.130.53
SQL>

Checking number of connection in load balancer

Hi,
could you help me find how many connection connected to load balancer in avg and peak connection on daily basis.
any script or tool to help us find out how many connection hitting to live real servers and VIP,

Hello,
You can utilize ACE Device Manger which is a built-in GUI tool to monitor system statistics. It is bundled in any license.
It is pretty easy to start. You need only basic configurations to access management address via https, and
snmp community for monitoring.
# Monitoring a rserver
You can change time range to view the graph. Options are 1h, 2h, 4h, 8, 24h, or All Date.
On the ACE, statistics are kept for 7 days or 20,000 hourly records, whichever comes first.
# Monitoring L7 connection
I think grapsh for L7 connections are aggregate statistics of all L7 policies.
Row data view.You can download the data in Excel format.
You can find more detail about the Device Manager in the Configuration Guide.
Some sample shots of DM view are also on the configuration guide.
Cisco 4700 Series Application Control Engine Appliance Device Manager GUI Configuration Guide
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA3_2_5/configuration/device_manager/guide/New_Book.html
Monitoring Your Network
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA3_2_5/configuration/device_manager/guide/UGmntr.html#wp998451
Thanks and regards,
Kimihito.

ISE 1.2 - Multiple NICs/Load Balancing for DHCP Probe

Hello guys
Just prepping an ISE 1.2 patch 8 setup in our organization. I am going for the virtual appliances with multiple NICs. It will be a distributed deployment with 4 x PSNs behind a load balancer and there is no requirement for wireless or guest user at the moment. I've got 2 points I will like to get some guidance on:
Our DC has a dedicated mgmt network and I plan to IP the gig0 interface of the PANs, MNTs and PSNs from this subnet. All device admin, clustering, config replication, etc will be over this interface. However, RADIUS/probe/other user traffic to the ISE PSNs will be over the gig1 interface which will be addressed from another L3 network. Is this a supported configuration in ISE?
I intend to use the DHCP probe as part of device profiling and will ideally like to have just an additional ip helper to add to our switch SVI config. Also, it will appear that WLCs can only be configured for 2 DHCP servers for a given network so another consideration for when we bringing our WLAN in scope. We however use ACE load balancers within our DC and from what I have read, they do not support DHCP load balancing. Are there any workarounds to using the DHCP probe with multiple PSNs without having to add each node as an ip helper/DHCP server on the NADs?
Thanks in advance
Sayre

Hello Sayre-
For Question #1:
Management is restricted to GigabitEthernet 0 and that cannot be changed so you should be good there
You can configure Radius and Profiling to be enabled on other interfaces
Even though you are not using guest services yet, you can dedicate an interface just for that. As a result, you can separate guest traffic completely from your production network
Take a look at this link for more info:
http://www.cisco.com/c/en/us/td/docs/security/ise/1-2/installation_guide/ise_ig/ise_app_c-ports.html
For Question #2
If you are using a Cisco WLC and running code 7.4 and newer you don't need to mess with the IP helper configurations.
The controller can be configured to act as a collector for client profiling and interact with the DHCP thread along with the RADIUS accounting task that is running on the controller. The controller receives a copy of the DHCP request packet sent from the DHCP thread and parses the DHCP packet for two options:
–Option 12—HostName of the client
–Option 60—The Vendor Class Identifier
After this information is gathered from the DHCP_REQUEST packet, a message is formed by the controller with these option fields and is sent to the RADIUS accounting thread, which is in turn transmitted to the ISE in the form of an interim accounting message.
Both DHCP and HTTP profiling settings are located under the "Advanced" configuration tab in the WLC
On the other hand, you can also use Anycast for profiling. You can check out some of Cisco Live's sessions for more info on that. Here is one that is from a couple of years (There are more recent ones that are available as well):
http://www.alcatron.net/Cisco%20Live%202013%20Melbourne/Cisco%20Live%20Content/Security/BRKSEC-3040%20%20Advanced%20ISE%20and%20Secure%20Access%20Deployment.pdf
I hope this helps!
Thank you for rating helpful posts!

SAP GLM Print Request - Load Balancing of WWI server

Hi GLM Experts,
I am using new GLM + module that generates labels based on Print Requests. I am unable to understand how I can load balance the WWI services when there are multiple label printing requests.
In GLM + we associate a WWI to a Print Station and which can then be associated with a printer. So in the configuration we are tying up a printer a WWI.
Also during label printing, if the scenario uses print request module, then the use need to select a print station and printer. What happens if the WWI related to the print station is down?
For example I have two services in WWI server GENPC1 and GENPC2. I created WWII and WWI2 as two print stations. I will associate my printer PRNWWI to both the print stations WWI1 and WWI2.
During label printing if the user picks and WWI1 and Printer PDNWWI and if the GENPC1 WWI server assocaited with print status WWI1 is busy and down I want WWI GENPC2 to generate the label?
How to setup the above load balancing or fall back? Please let me know.
Thanks
Pugal

Dear Pugal
we are not using GLM + and I am not sure about the technqiue used there to handle load balancing. Regarding general WWI setup I assume you know this Note: EH&amp;S: Availability and performance of WWI and Expert servers
On the top there is a further SAP Note abvailable which might be of interest. This is referenced here:
http://de.scribd.com/doc/191576739/011000358700000861002013-e
May be check OSS note: 1958655; OSS Note 1155294 is more related to normal WWI stuff; but may be check it as well. May be 1934253 might help better
May be this might help.
C.B.
PS: may be check as well: consolut - EHS_MD_140_01 - EH&amp;S-Management-Server einrichten
The load balancing of synchron WWi servers is donein the "RFC" layer, therefore you have no inffluence here, for asynchron WWI servers you can do a lot to manage the WWI load balancing by using "exits" etc.

Site not accessible from the Load balanced web front end server - sharepoint 2010

I have a production environment with 2 WFE's(sp-wfe1 & sp-wfe2), 2 APP's and 2 SQL clustered VM's.
2 WFE's are load balanced using hardware load balancer.
An A-Record(PORTAL) is created in DNS for the virtual IP of the load balancer which points to the 2 WFE's.
A web application is created on the WFE's on port 80.
alternative access mapping is configured and the load balanced record "http://PORTAL" is used under the default zone.
Under IIS I have edited the bindings for the sharepoint site at port 80 and added the HOSTNAME as PORTAL.
Result: The site is accessible from outside the server and works fine.
ISSUE: The site is not accessible within the WFE's(sp-wfe1 & sp-wfe2).
When I browse the site from the WFE's server it ask for the credentials and when I enter the credentials and click OK it ask the credentials again and again and in the end displays a blank page.
Kindly help me in this issue because I am clueless and couldn't find anything helpful on the internet.
Regards,
Mudassar
MADDY-DEV Forum answers from Microsoft Forum

Loop back check.
http://www.harbar.net/archive/2009/07/02/disableloopbackcheck-amp-sharepoint-what-every-admin-and-developer-should-know.aspx

Problem with WLIOTimeoutSecs in weblogic and apche CSS load balancer

Hi,
We are using Weblogic 11g, apache 2.2 and CSS load balancer for load balancing.
we have huge reports which take minutes to generate and hence we need higher value for WLIOTimeoutSecs. This works fine when we use server url but WLIOTimeoutSecs is not working when we use CSS load balancer.
We checked with our load balancing team they said CSS load balancer will not repost the request.
Here is the plugin configuration
<Location /*****>
SetHandler weblogic-handler
PathTrim /
WebLogicHost 'serevrip'
WebLogicPort 'port'
WLIOTimeoutSecs 3600
Idempotent OFF
WLProxySSL ON
DefaultFileName /***/***/index.jsp
Debug On
WLLogFile /***/***/***/***.log
</Location>
Could some please help me on this.
Thanks in advance
Regards,
Venkat

Hi Tarun,
The problem occurs when the SSL is enabled on apache. If I access the same URL over HTTP, the parameter WLIOTimeOut works fine.
Also I observed that, none of the parameters are getting applied to the plugin. I had switched on 'DebugConfigInfo'. With this the HTTP URL with ?__WebLogicBridgeConfig as query parameter returned the complete configuration. However when accessed with HTTPS the server did not return the configuration.
Is there a specific configuration to be applied when apache is used with SSL?
Thanks for your help,
Shashi

How to configure Load balance

Dear all,
Newly I installed dialog instance to my CI server,
Now I can configure load balance to my CI server.
Please send configuration doc for MSLG and what
Settings I need to perform in SAPGUI
Regards,
satish

Hi.
look at following
http://help.sap.com/saphelp_nw04s/helpdata/en/c4/3a644c505211d189550000e829fbbd/frameset.htm
check
26317 Set up for LOGON group for autom. load balancing
118093 Concepts of defining 'limits' in logon load balancing
27044 Login workload Balancing verification test
624955 Poor user distribution in logon load balancing
regards,
kaushal

Load balancing check

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