Legolas
the picture (although a bit detailed and crowded) at
http://wiki.glassfish.java.net/gfwiki/Wiki.jsp?page=GlassFishV2Architecture
might help
P
kedar wrote:
> Hi Legolas,
>
> Let me try to explain:
>
> Domain Spans machines, usually.
> One of the machines is designated as DAS, as Pankaj pointed out earlier.
> The DAS is the admin server and it manages the servers in the same
> domain. The servers can be clustered if administrator wants them so.
> The administrator has benefits of management when instances are
> clustered.
>
> Now, on the other machine, all you need is "bits".
>
> Consider the scenario: You have "m1" and "m2" as two machines. Let's
> say you want to create a cluster "c1" with instances "s1" and "s2"
> with node-agents "na1" on "m1" and "na2" on "m2". Your DAS is on "m1".
> Let's call the domain where all this "logically" resides as "domain1".
>
> You do the following:
> 1- Download the glassfish.jar on both "m1" and "m2".
> 2- On "m1", run "ant -f setup-cluster.xml". This creates the domain,
> domain1 that is capable of handling clusters.
> 3- On "m1", you start domain, domain1.
> 4- On "m1", <bin>/asadmin create-node-agent na1
> 5- On "m2", run ant -f setup-cluster.xml on glassfish.jar you downloaded
> (after of course, java -jar ...) This creates a domain on that machine
> as well, but you don't need it. I will file an RFE in this regard.
> 6- On "m2" you create a node-agent *pointing to domain1 on "m1"* as:
> <bin>/asadmin create-node-agent --host m1 --user admin-user na2
> 7- On "m1", <bin>/asadmin start-node-agent na1
> On "m2", <bin>/asadmin start-node-agent na2
>
> Now, your topology is created and ready to go.
> You have a domain domain1, this spans "m1" and "m2".
> Node-agent "na1" is on "m1". It will control instances on "m1".
> Node-agent "na2" is on "m2". It will control instances on "m2".
>
> From this point on, forget you had machine "m2". The entire
> configuration can be done just from machine "m1".
>
> This is the beauty of the process, IMO.
>
> 8- On "m1", just try: <bin>/asadmin create-cluster c1
> 9- On "m1", <bin>/asadmin create-instance --cluster c1 --nodeagent
> na1 s1
> This puts "s1" in cluster "c1". Note that this instance is controlled by
> Node Agent "na1". This instance uses "physical resources" from "m1".
>
> 10- On "m1", (not "m2"!)
> <bin>/asadmin create-instance --cluster c1 --nodeagent na2 s2
>
> 11- On "m1", <bin>/asadmin start-cluster "c1".
>
> This is where it culminates.
> All you do is "start cluster".
> It starts instance "s1" on "m1" and "s2" on "m2".
>
> The instances have homogeneous configuration.
>
> Does this help?
>
> Regards,
> Kedar
>
> Legolas Woodland wrote:
>> Thank you for reply.
>> just as last question:
>>
>> As i said i have DAS installed and configuredin my own computer
>> i want to install some more glassfish in other computer and add them
>> to cluster.
>>
>> question is:
>>
>> Should i install glassfish clustered edition on other computers that
>> will act as nodes?
>> ant -f setup-cluster.xml
>>
>> Thankss
>>
>> On 4/17/07, *Pankaj Jairath* <Pankaj.Jairath_at_sun.com
>> <mailto:Pankaj.Jairath_at_sun.com>> wrote:
>>
>> Legolas Woodland wrote:
>>
>> > Thank you very much for reply.
>> >
>> > Right now i think i have setup a cluster and a load balancer
>> according
>> > to your very good weblog.
>> > I have sun java web server 7.u1 and latest blassfish installed.
>> > What i want to know is:
>> > I have one DAS, And a web server which according to your weblog
>> will
>> > balance the load between any instance that we add in
>> loadbalancer.xml .
>> >
>> > I have two questions and one problem.
>> >
>> > problem:
>> > I tried several time to create load balancer in glassfish
>> application
>> > server and then apply it to my web server, but it just return an
>> error
>> > without any stack trance, error say: Can not connect to server.
>> > My web server and glassfish both works on the same machine, so i
>> > tried: 127.0.0.1 <http://127.0.0.1> < http://127.0.0.1>,
>> localhost and my lan ip address
>> > none of them worked.
>> > the port that i can access my web server administration console is
>> > 8989 and i used this port in HTTP Load Balancers node of glassfish
>> > administration console when i trid to create the load balancer.
>>
>> The communication between DAS and WS/LB is over SSL and the
>> host/port
>> needs to be HTTPS listener of the WebServer Instance and not that
>> of the
>> Admin Server (the Load Balancer is configured to run on the
>> WebServer
>> instance). Given that you have successfully configured the SSL setup
>> between the DAS and WS/LB, check with changing the port to the SSL
>> port
>> of the WebServer 7.0 instance.
>>
>> >
>> > IS there anything specific to change in order to make it
>> possible to
>> > apply changes to web server load balancer from glassfish console?
>> >
>> > Now my question:
>> >
>> > -what kind of glassfish i should setup in some other machines
>> to add
>> > them to the cluster? can they be normal domains or there are some
>> > specific ways to create domains to add them to cluster?
>> > can you give me the steps?
>> >
>>
>> You can create multiple server instances and group them under a
>> defined
>> cluster configuration. The cluster or the group of clustered server
>> instances are under a single domain. Domain is the administrative
>> reference - the single point / central repository of carrying out
>> the
>> administrative tasks.
>>
>> You can refer to the documentation that details the setups to work
>> with
>> clusters. This is from the /"High Availability Administration
>> Guide"/
>> under chapter 5 : /"Using Application Server Clusters" /:-
>> http://docs.sun.com/app/docs/doc/819-3679/6n5spoggp?a=view
>>
>> Specifically refer to the topic named - /"Working with Clusters"./
>>
>> > -I find that we can have several instance in a server? what is
>> > relation of domains with instances? why we should have several
>> > instance in a domain?
>>
>> There can be zero or more server instances in a administrative
>> domain
>> and there can one or more such domains. Each such domain has its
>> own
>> DAS. DAS is actually the designated administrative server instance
>> with
>> a default config within a domain.
>>
>> regards
>> Pankaj
>>
>> >
>> >
>> >
>> > Thanks.
>> >
>> >
>> >
>> >
>> >
>> >
>> > On 4/17/07, *Pankaj Jairath* <Pankaj.Jairath_at_sun.com
>> <mailto:Pankaj.Jairath_at_sun.com>
>> > <mailto: Pankaj.Jairath_at_sun.com
>> <mailto:Pankaj.Jairath_at_sun.com>>> wrote:
>> >
>> > Hello Legolas,
>> >
>> > If I understood your question, you are referring to the UI
>> element
>> > "HTTP
>> > Load Balancers" element of the GlassFish V2 Application
>> Server. If so
>> > let me give a brief.
>> >
>> > GlassFish V2 provides the HTTP Load Balancer which can then be
>> > deployed
>> > onto the supported WebServer - for GlassFish V2 it's the Sun
>> Java
>> > System
>> > WebServer 6.1 / 7.0. When defining the High Availability
>> deployment
>> > topology of a Java EE deployment, administrator would
>> define a
>> > cluster
>> > of application servers instances and install and configure the
>> > HTTP Load
>> > Balancer to take care of load balancing and failover of the
>> HTTP
>> > requests.
>> > To do this administrative configuration steps, the
>> end-user can
>> > use the
>> > Admin Console (GUI) or the CLI commands to define the
>> cluster, it's
>> > configuration and associate a HTTP Load Balancer with this
>> > configuration. This association defines the cluster
>> configuration and
>> > other Load Balancer configurable parameters, which the HTTP
>> Load
>> > Balancer uses to perform its HA functionality. The
>> administrator
>> > can use
>> > the Admin Console to generate this HTTP Load Balancer
>> > configuration and
>> > even push the configuration over the wire to the deployed
>> HTTP Load
>> > Balancer on a given Sun Java System WebServer.
>> >
>> > Refer to the documents provided earlier for further details
>> on how to
>> > use the Domain Administrative Server (DAS) Admin Console
>> (GUI) or
>> > CLI to
>> > administer the HTTP Load Balancer.
>> >
>> > regards
>> > Pankaj
>> >
>> > legolas wood wrote:
>> >
>> > > Hi
>> > > Thank you for reading my post.
>> > > What is relation of "HTTP Load Balancers" in administration
>> > console
>> > > with using sun java web server as load balancer?
>> > >
>> > > Thanks
>> > >
>> > >
>> >
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