Application Server basic concept -- "server instance"

If I am to run multiple web applications, do i need multiple instances of the application server at the same time? or is that one server instance can handle multiple applications?
jtjliAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

suprapto45Commented:
Hi,

>>"do i need multiple instances of the application server at the same time?"
No you don't.

One server instance can definitely handle multiple applications. For example, in Tomcat, if you see your <TOMCAT_HOME>/webapps folder, all the folders there are the web applications.

David
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
suprapto45Commented:
If your app server is accessible from http://localhost:8080 and you have deployed multiple web applications successfully, you can access them as http://localhost:8080/WebApp1, http://localhost:8080/WebApp2 and so on.
0
suprapto45Commented:
Sorry for spamming your mail by posting multiple replies.

You may be confused on the concept of clustering. In clustering the servers, yes, you will need multiple app server instances. However, in the simple scenario, you can deploy multiple web applications to one instance of app server. The disadvantage of this design is that once the app server is down / shut down, all the web applications are also inaccessible. By clustering the servers, if one of the app servers are down, all the web applications are still accessible (it may be slower). In clustering environment, all the workloads are also shared by multiple servers instead of single server.

Hope that helps.
David
0
Newly released Acronis True Image 2019

In announcing the release of the 15th Anniversary Edition of Acronis True Image 2019, the company revealed that its artificial intelligence-based anti-ransomware technology – stopped more than 200,000 ransomware attacks on 150,000 customers last year.

Mayank SAssociate Director - Product EngineeringCommented:
Yes, clustering is a different thing if that is what you meant:

http://tomcat.apache.org/tomcat-5.0-doc/cluster-howto.html
0
jtjliAuthor Commented:
Thanks for the replies.
Just one last question.

In the case of clustering, does each web app run on a different server, or the same web app can run across several servers (so that when one crashed, the web app still runs) ? Also, is it possible to link up servers across different geographical locations (e.g. some in USA some in UK) to form a cluster?



0
Mayank SAssociate Director - Product EngineeringCommented:
Different instances of the same web app run on different servers - did I say that clearly? If one crashes, the other still runs. And you can link them up across locations regardless of location as long as they are on the same network.
0
suprapto45Commented:
Agree! :)
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Web Servers

From novice to tech pro — start learning today.