Web sphere application server online training

Web Sphere Application ServerInterview Question and Answers

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1. What is Ripple start?

Ripple start is to restart the WAS cluster. It first stops

the JVM and then starts it. By doing ripple start you

ensure only one JVM is down at one time hence no

downtime to the applications.


2. What would you do when JVM is consuming

100% CPU & Memory on a server?

First of all, identify which JVM is having high

utilization. Take a thread dump of identified JVM for

investigation and restart the JVM as a workaround to

cool down the CPU/Memory.


3. What is node sync?

IBM WAS stores the entire configuration in a central

repository called “Master repository” and every node

will have the local repository. When you make any

changes to the node through DMGR, you must sync it

so configuration is pushed to respective node’s server.


4. Can application run without any issue if DMGR

is down?

Yes, DMGR down doesn’t impact existing running

application. However, if you need to make any

changes or deployment through DMGR then that

would be impacted.


5. What is a virtual host?

Virtual host contains multiple URLs (IP or FQDN

based) on a single application and configuration is

done through WAS administrative console. In order to

allow an application to be accessible on particular

URL, you must have this URL in a virtual host and

associated with the application.


5. What is a virtual host?

Virtual host contains multiple URLs (IP or FQDN based) on a single application and configuration is done through WAS administrative console. In order to allow an application to be accessible on particular URL, you must have this URL in a virtual host and associated with the application .


6. What are the Web Sphere editions available?

WAS – Network Deployment

WAS – Developers

WAS – z/OS

WAS – Hypervisor

WAS – Express

WAS – Base

WAS – Liberty core


7. What are the common issues you have experienced?

You should always be honest about your expertise, however, to give you an idea:

Virtual host not defined

Logs not moving

Internal Server Error

Out Of Memory exception

Slowness

JVM not starting

High CPU/Memory/Disk utilization


8. How do you know if your JVM is up or not?

There are multiple ways to confirm this.

Do you have any monitoring tool if so check if there is

any alert or current status

Login to server and grep for the JVM by ps -ef | grep

jvm name

Check if you can access the JVM URLe

Check if you can telnet JVM URL and port


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