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

Similar Messages

  • Best way for HTTP load balancing in OSB

    Hi everybody,
    We have setup an OSB cluster and we need to load balance HTTP requests across managed servers. Looking for info about load balancing in OSB I found that there are mainly two options: using a hardware load balancer or a software solution like Weblogic HttpClusterServlet. At the moment we have no hardware balancer available so we will have to take the software option. I found some articles about configuring HttpClusterServlet like http://redstack.wordpress.com/2010/12/20/using-weblogic-as-a-load-balancer.
    But I have a question about this configuration. If we use a managed server as an HTTP proxy that balances requests between OSB managed servers, what would happen if this server goes down? I think one of the main goals of a clustered deployment is avoiding a single point of failure but with that setup all requests would depend on the availability of the proxy managed server.
    Could you recommend us a setup for implementing load balancing in OSB?
    Thank you in advance,
    Daniel.

    Load balancing in a cluster for http requests can be achieved using atleast 4 different ways:
    (1)- use a hardware load balancer like F5 BigIP LTM
    (2)- use a web server with weblogic plugin to frontend the cluster
    (3)- use weblogic with HTTPClusterServlet
    (4)- use DNS round robin - this works if you have managed servers running on 2 machines (say mach1, mach2) but on the same port. HTTP clients use hostname 'mach' to access the URL's and the dns does a round robin name resolution of mach to mach 1 and mach2 IP addresses..
    All the options except (1) achieve only load balancing and not auto failover on all instances.. Hardware load balancers has the extra feature of probing [ sending periodic pings to the targets] , by which it can detect whether the target resource is alive and if not send the traffic to other nodes which are alive.. this is why hardware load balancers are worth their investment..
    other options may work if client is coded to do retrying on failure.. so on 2nd or subsequent attempt, the routing is done to the machine which is alive..
    For options (1),(2) and (3), you also need some redundancy of load balancing device ( web server, weblogic or hardware load balancer) to prevent single point of failure.. Hardware load balancers are usually deployed in redundant pairs to achieve this..
    Edited by: atheek1 on 22/11/2011 15:31

  • Webdispatcher for Load balancing

    Hi All,
    We have implemented EP7. The portal is configured to redirect to https.
    Now we want to use sapwebdispatcher for load balancing.
    We are performing the following steps to configure the sapwebdispatcher
    1. uncar the icmadmin.SAR
    2. sapwebdisp -bootstrap
    The following screen appears:
    This bootstrap will perform the following steps:
    1. create profile file "sapwebdisp.pfl"for SAP Web Dispatcher (if not already existing)
    2. create user for web based administration in file "icmauth.txt"(if not already exisiting)
    3. start SAP Web Dispatcher with the created profile
    After the bootstrap you can use the web based administration
    Generating Profile "sapwebdisp.pfl"
    Hostname of Message Server (rdisp/mshost): <hostname>
    HTTP Port of Message Server (ms/http_port): 8101
    Checking connection to message server...OK
    Unique Instance Number for SAP Web Dispatcher (SAPSYSTEM): 38
    HTTP port number for SAP Web Dispatcher: 8101
    Create configuration for s(mall), m(edium), l(arge) system (default: medium): l
    WARNING: Maximum number of sockets supported on this system: 2045
    Please check the operating system configuration
    Profile "sapwebdisp.pfl" generated
    Authentication file "icmauth.txt" generated
    Web Administration user is "icmadm" with password "xxxxxxxxx"
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    sapwebdisp started with new pid 14014
    Web administration accessible with "http://<hostname>:8101/sap/wdisp/admin/default.html"
    SAP Web Dispatcher bootstrap ended (rc=0)
    <hostname>47> *** WARNING: Could not start service 8101 for protocol HTTP on host "<hostname>m"(on all adapters)
    SAP Web Dispatcher up and operational (pid: 14014) ***
    Now, if I use any port other than 8101 for HTTP port number for SAP Web Dispatcher the webdispatcher does not work.
    If i use port 8101(which i am using currently) then the webdispatcher does the load balancing however i cannot access the http://<hostname>:8101/sap/wdisp/admin/default.html url
    Can anyone help me getting both thigs: load balancing and the webdisp admin page also.
    Thanks!!
    Regards,
    Rohit

    Hi Rohit,
    this is your Profile File
    Generating Profile "sapwebdisp.pfl"
    Hostname of Message Server (rdisp/mshost): <hostname>
    HTTP Port of Message Server (ms/http_port): 8101
    Checking connection to message server...OK
    Unique Instance Number for SAP Web Dispatcher (SAPSYSTEM): 38
    HTTP port number for SAP Web Dispatcher: 8101
    Create configuration for s(mall), m(edium), l(arge) system (default: medium): l
    WARNING: Maximum number of sockets supported on this system: 2045
    Please check the operating system configuration
    Profile "sapwebdisp.pfl" generated
    Authentication file "icmauth.txt" generated
    Web Administration user is "icmadm" with password "xxxxxxxxx"
    Restart sapwebdisp with profile: sapwebdisp.pfl
    sapwebdisp started with new pid 14014
    Web administration accessible with "http://<hostname>:8101/sap/wdisp/admin/default.html"
    You have wrongly configured your HTTP port number for SAP Web Dispatcher make it as 80 by default
    Sample Profile File:
    Profile generated by sapwebdisp bootstrap
    unique instance number
    SAPSYSTEM = 1
    add default directory settings
    DIR_EXECUTABLE = .
    DIR_INSTANCE = .
    Accessibility of Message Servers
    rdisp/mshost = Hostname
    ms/http_port = 8101
    SAP Web Dispatcher Parameter
    wdisp/auto_refresh = 120
    wdisp/max_servers = 100
    wdisp/shm_attach_mode = 6
    configuration for small scenario
    icm/max_conn      = 100
    icm/max_sockets   = 1024
    icm/req_queue_len = 300
    icm/min_threads   = 5
    icm/max_threads   = 15
    mpi/total_size_MB = 20
    #maximum number of concurrent connections to one server
    wdisp/HTTP/max_pooled_con = 100
    wdisp/HTTPS/max_pooled_con = 100
    SAP Web Dispatcher Ports
    icm/server_port_0 = PROT=HTTP,PORT=80
    icm/server_port_1 = PROT=ROUTER,PORT=443
    Swapnil

  • Mod_oc4j for load-balancing

    Guys,
    Looking for some feedback on DMSMetricCollector when using "metric" as the selectmethod for load-balancing. What i want to know is that whether the DMSMetricCollector can be configured to use multiple metrics such jvm-heapsiize, servlet-processRequestTime etc, Connection-pools FreePoolSize.value etc ? the documentation doesn't explicitly mention that if its possible, apparently it doesn't but want to check from the experts here, Steve you might have something on this...
    Or if there is any other implementation available which supports load-balancing based on multiple performance metrics
    Thanks and Regards

    can i use this loadbalancer.jar or not?
    how to mod_oc4j in standalone app server

  • CF8/JRun4 Cluster for Load Balancing

    Does anyone have an example of how to set up a CF8/JRun4
    cluster for load balancing?
    I have three servers:
    x004 - Linux - Apache2 (10.0.0.54,10.1.0.54)
    x020 - Linux - JRun4/CF8 (10.0.0.70,10.1.0.70)
    x021 - Linux - JRun4/CF8 (10.0.0.71,10.1.0.71)
    Every server in our network has two network cards. One
    network card is attached to 10.0.x.x which has a gateway to the
    internet and runs at 100Mbps and is firewalled, and the other is
    attached to 10.1.x.x which runs at 1Gbps and is internal with no
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    STST using 10.1.0.54 which consists of STST_x020 coldfusion server
    running on x020 and STST_x021 running on x021. I want the
    communications between JRun4 on x020 and x021 to occur on the
    10.1.x.x network and eventhough JRun and ColdFusion will only use
    the 10.1.x.x network I still need the 10.0.x.x network card
    attached for other purposes which require a gateway. I have
    installed JRun4/CF8 about 10 times already and it seems I have no
    control over what network JRun4 clusters on... sometimes it will
    communicate on one, sometimes the other and without being able to
    set which network is being used there always seems to be "network
    error" on at least one of the two CF8 servers. I was able to get
    everything working fine by disabling the network cards on the
    10.0.x.x network and re-installing everything... but as soon as I
    added the network cards back the whole thing was broken again.
    How is this supposed to work? Most of the examples are either
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    How do I install a connector on a web server which doesn't
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    and the cluster is not listed?
    How do I get JRun to bind to a specific network card?
    Does this work if I choose a J2EE server other than JRun?
    Any help anyone can provide is greatly appreciated. I'm
    getting close to giving up which means staying on the non-clustered
    environment and figuring out how we can deal with scalability by
    switching to something else.

    The article at
    http://www.adobe.com/go/1e8e9170
    is specific to configuring two or more cluster nodes that reside on
    separate networks, e.g. 10.0.1.0/24 and 10.0.2.0/24. (The article
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    cluster nodes host a single instance of JRun or multiple instances
    of JRun in the same cluster domain. When performing unicast
    discovery, JRun looks for all Jini groups and not just the cluster
    group.)
    Anyhow, that's not your problem. The simplest solution is you
    haven't enabled the jrun.servlet.jrpp.JRunProxyService service. I'm
    most familiar with the Windows version of JRun, but I'm assuming
    the directory structure is similar across platforms. In
    <jrun_root>/servers/<name>/SERVER-INF/jrun.xml, set the
    deactivated attribute of the jrun.servlet.jrpp.JRunProxyService
    service to false and restart JRun. You should now see JRun
    listening on the appropriate port. (The default for the first
    manually created instance is 51000.) You can limit the proxy
    service to a single interface using the interface attribute.
    If you have enabled the proxy service, verify your security
    settings in <jrun_root>/lib/security.properties. It's usually
    best to limit access to specific hosts. Comment out the
    jrun.subnet.restriction parameter and set the jrun.trusted.hosts to
    the IP address of your web server, e.g. 10.1.0.54.
    Forcing all JRun processes/services to listen on a single
    interface isn't difficult, but it does require modifying quite a
    few configuration files by hand. If you need assistance with that,
    I can elaborate.
    Configuring the JRun module under Apache is pretty
    straightforward. If you're not using virtual hosts, it's very
    simple. If you are using virtual hosts, it's still simple, but your
    JRun configuration can be virtual host-specific.
    On your Apache server, you'll want to create a directory
    structure for the JRun module. I'll assume
    /opt/jrun/lib/wsconfig/1, but you can use anything you want. Once
    the directory structure is created, extract the appropriate JRun
    module from wsconfig.jar to the new directory. You're most likely
    interested in the Apache 2.0 module,
    wsconfig.jar/connectors/apache/intel-linux/prebuilt/mod_jrun20.so.
    Let's assume you've extracted the module to
    /opt/jrun/lib/wsconfig/1/mod_jrun20.so. Your Apache service account
    should have read, write, and execute permissions on the
    /opt/jrun/lib/wsconfig/1 directory.
    The JRun module configuration is normally appended to your
    current httpd.conf file by wsconfig. Here's a sample configuration:
    LoadModule jrun_module
    "/opt/jrun/lib/wsconfig/1/mod_jrun20.so"
    <IfModule mod_jrun20.c>
    JRunConfig Verbose false
    JRunConfig Apialloc false
    JRunConfig Ssl false
    JRunConfig Ignoresuffixmap false
    JRunConfig Serverstore
    "/opt/jrun/lib/wsconfig/1/jrunserver.store"
    JRunConfig Bootstrap 10.1.0.70:51000
    #JRunConfig Errorurl <optionally redirect to this URL on
    errors>
    #JRunConfig ProxyRetryInterval 600
    #JRunConfig ConnectTimeout 30
    #JRunConfig RecvTimeout 30
    #JRunConfig SendTimeout 30
    AddHandler jrun-handler .jsp .jws .cfm .cfml .cfc .cfr
    .cfswf
    </IfModule>
    You may also want to update your DirectoryIndex directive
    with an appropriate index page, e.g. index.cfm.
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    is received, the module will query the boostrap server,
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    your cluster correctly, a line similar to following will be written
    to /opt/jrun/lib/wsconfig/1/jrunserver.store:
    proxyservers=10.1.0.70:51000;10.1.0.71:51000
    You can create/edit this file manually as well.
    Unfortunately, the bootstrap option only accepts one server. If
    your bootstrap server is down, the JRun module will use the values
    in jrunserver.store directly, if the file exists.
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    metrics *
    debugger *
    ssl *
    verbose
    traceflags
    serverstore
    bootstrap
    errorurl
    apialloc
    ignoresuffixmap
    proxyretryinterval
    connecttimeout
    recvtimeout
    sendtimeout
    sslcalist
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    server level and/or the virtual host level. The usage of these
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    code is included in wsconfig.jar. Keep in mind that versions of the
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    can't find what you need in the JRun or ColdFusion documentation,
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    If you're looking for resiliency, I highly recommend
    expanding your configuration to include a second web server and a
    hardware load-balancer (preferably one that supports redudancy via
    multiple paths and devices, e.g. devices from Cisco, F5, or Foundry
    Networks). Often, however, running Apache on the ColdFusion
    server(s) provides adequate performance, and round-robin DNS
    records coupled with the ability to update DNS quickly in the event
    of a failure may be all you need for load-balancing and
    failover.

  • Recommended configuration for load balanced Portal with load balancer, multiple gateways and multiple servers.

    Does anyone have a recommended network, hardware and software configuration guide for a Portal installation running with multiple gateways load balanced (ie one URL) that talk to multiple servers?

    David,
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    you to group all the gateways under 1 virtual URL and load balance the
    incoming connections over each gateway depending on the rules that you
    define in Resonate. Look in the SUN portal whitepapers there is one that
    talks about it specifically.
    As far as load balancing the calls to the portals, the gateways will
    automatically load balance across all the portals that they know about
    using a simple round-robin rotation. You may be able to use Resonate in
    front of the portals but you may need to activate persistance within
    Resonate to ensure that the user always ends up on the portal that he
    established his initial connection on (if you want that), check with Sun
    on this one.
    David Broeren wrote:
    Recommended configuration for load balanced Portal with load balancer,
    multiple gateways and multiple servers.
    Does anyone have a recommended network, hardware and software
    configuration guide for a Portal installation running with multiple
    gateways load balanced (ie one URL) that talk to multiple servers?
    Try our New Web Based Forum at http://softwareforum.sun.com
    Includes Access to our Product Knowledge Base!

  • Best practice for load balancing on SA540

    Are there some 'best practice' guide to configure out load balancing on SA540 .?
    I've got 2 ADSL lines and would like device to auto manage outgoing traffic .. Any idea ?
    Regards

    Hi,
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    Regards,
    Richard

  • Cluster Apex MS's across multiple nodes for load balancing?

    Can Cluster Apex MS's across multiple nodes for load balancing? If Yes/No, any supportive doc's will be much appreciated.
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    Caused By: com.sleepycat.je.EnvironmentLockedException: (JE 4.0.103)$HOME/apex/bdb The environment cannot be locked for single writer access. ENV_LOCKED: The je.lck file could not be locked. Environment is invalid and must be closed.
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    Hey there,
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    Did it help?
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  • Round robin DNS for load balancing between multiple network adapters (Xserve)

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  • Windows Event Collector - Built-in options for load balancing and high availability ?

    Hello,
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    I would like to deploy a second collector for high availability and load balancing. What are the available options ? I have not found any guidance on TechNet articles.
    As a low cost option, is it fine to simply start using DNS round-robin with a common alias for both servers pushed as a collector name through GPO ?
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    Thanks for your help.

    Hi,
    >>As a low cost option, is it fine to simply start using DNS round-robin with a common alias for both servers pushed as a collector name through GPO ?
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    Regarding DNS round robin, the following article can be referred to for more information.
    Configuring round robin
    http://technet.microsoft.com/en-us/library/cc787484(v=ws.10).aspx
    TechNet Subscriber Support
    If you are TechNet Subscription user and have any feedback on our support quality, please send your feedback here.
    Best regards,
    Frank Shen

  • Query - Business Objects- CMS Cluster internals for load balancing/ sharing

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    Regards,
    G

    If you somehow needed to accomplish load balancing between the 2 machines which wasn't 50/50 you could possibly try dns aliasing and have more copies of one machine than the other.  I'm not recommending this, just thinking out loud here.

  • Distributed naming services for load balancing

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    ata,
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    John

  • Clustering for load balancing only

    I wish to set up 2 WLS 8.1 machines to run an application independently to
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    Chris,
              Yes you can certainly use a Cluster simply for load balancing. There is no
              mandate that you have to take advantage of session state replication in the
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              ~Ryan Upton
              "Chris Steains" <[email protected]> wrote in message
              news:[email protected]..
              > I wish to set up 2 WLS 8.1 machines to run an application independently to
              > share load (no replication of sessions, beans etc).
              >
              > Can I create a cluster for the two servers and not turn on any session or
              > bean replication, then configure the IIS or Apache plug-in to use the
              > cluster and therefore create some load balancing?
              >
              >
              > Chris
              >
              >
              

  • How to setup Adobe Media Server Professional x 2 run as cluster for load balance?

    How to setup Adobe Media Server Professional x 2 run as cluster for load balance?

    Hi,
    Welcome to adobe forums,
    Please refer to these help files in order to setup AMS as a cluster : https://helpx.adobe.com/adobe-media-server/config-admin/load-balancing.html
                                                                                                                https://helpx.adobe.com/adobe-media-server/tech-overview/scaling-server.html
    Let me know if you need any help.
    Regards,
    Puspendra

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