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Set of IBM interview questions often asked in an interview for fresher to experienced level.
WebSphere is a suite of product, and this article isonlyaboutWebSphere tool Server.
In case you are wondering what products are under WebSphere suite.
Ready to go through thequestions?
Ripplestart is to restart the WAS cluster.
It first stops the JVM and then starts it.
By doing ripplestart you ensure only one JVM is down at one time hence no downtime to the applications.
What would you do when JVM is consuming 100% CPU & Memory on a server?
What is node sync?
Sync always happens from master to local repository, so its one-way communication.
Can program run without any issue if DMGR is down?
Yes, DMGR down doesnt impact existing running tool.
However, if you oughta make any changes or deployment through DMGR, then that would be affected.
How to deploy an app in WebSphere?
There are three possible ways to deploy.
Why does JVM come up automatically though I stop/kill the process manually?
There could be two things.
Automatic restartis enabled for the JVM which is default configs and available under JVM»Monitoring policy.
What file types you’re free to deploy into WebSphere?
What is a virtual host?
How would you deal with slow program complaint from clients?
To isolate, you’re able to check the following.
It would be worth checking if there were any release and slowness is just after that.
How to take WAS configuration backup without stopping the DMGR?
Go to DMGR profile and bin folder
Execute./backupConfig.sh -nostopto take a backup
11.
Whats the default WAS port?
The default port for HTTP is 9080 and HTTPS 9443.
Checkoutdefault port pagefor more.
What are the WebSphere editions available?
How to generate and propagate the plugin?
What are the common issues you have experienced?
How to check the installed WAS version?
How do you know if your JVM is up or not?
There are multiple ways to confirm this.
Choose whatever is easy for you.
Tell me some of the log files generated by WebSphere?
How to generate a thread dump?
There are three possible ways to generate a thread dump.
Whats a difference between vertical and horizontal cluster?
What is garbage collection?
How do you disable security in WebSphere?
You candisable securityby executing securityoff through wsadmin.sh.
DMGR must be restarted after switching off the security.
How to enable verbose garbage collection?
How to make WebSphere auto-start when server reboot?
WebSphere automatically generates startup script in /etc/init.d which will ensure it starts when reboot.
Refer my detailed guide onhow to auto-start services on boot.
How to increase the heap size of JVM?
you’ve got the option to enter initial and maximum heap size here.
Can you Sync the node when nodeagent is down?
Absolutely, nodeagent must be in stopped for sync to work.
Whats a command to stop and start DMGR, Nodeagent & JVM?
To stop
To start
27.
Whats new in WAS 8.5.5?
On the high level:
You may also refer the detailed information here.
What does it mean by node federation?
Federation in WebSphere means adding a node to the Cell.
This is done by addNode.sh command, and this may take a few minutes based on the node size.
FFDC (First failure data capture) capture event and error during WebSphere runtime.
Can you decode WebSphere keystore XOR?
Yes, you’re free to through online tool http://strelitzia.net/wasXORdecoder/wasXORdecoder.html
31.
Which scripting language is the default in WebSphere?
JACL is the default scripting language in WebSphere.
How can you apply fix pack in WebSphere 8.5.x?
IBM IM can be used to apply the fix.
Referhow to apply fix pack guidefor detailed instruction.
What are the environments you support?
Be honest and explain the environments you support.
You may be supporting the following.
Where is your web server hosted?
Again explain about your supported system architecture.
This means you must have necessary ports allowed in the firewall between web servers to an tool server.
What is the session affinity?
Session affinity in another word is persistence session.
Having session affinity allow a request to bind with single JVM.
It means the returning request will always be routed to the same JVM.
Can you deploy more than one app in single JVM?
Which database do you use with Websphere?
Tell them what you use.
Most of the organization use Oracle database but WebSphere support the following database as well.
How do you connect Web Server to WAS?
There are two ways to connect to WAS.
Do I need Web Server in front of WAS?
Its recommended to have supported web server in front of WAS for better security, performance & maintenance.
What is a Cell?
What is the default session timeout for an administrative console?
30 minutes
42.
What is a fix pack?
A fix pack is a collection of patches provided by IBM.
It may contain bug fixes, security patches & performance improvements.
What is the registry or repository supported in WebSphere?
What is shared libraries?
Creating a shared library is recommended to reduce the duplicate library files.
The single shared library can bed used by multiple applications within a cell.
What is context root?
A context root for each utility should be unique within the cell.
Its defined n deployment descriptor and used to enter the utility.
What is WAS plugin configuration file name?
WebSphere plugin configuration name isplugin-cfg.xml
47.
How to change WebContainer thread pool size?
WebContainer thread pool can be changed by going insideJVM » Thread pools » WebContainer
48.
Can you change the context root for deployed software?
Yes, its doable.
JVM must be restarted after the change.
Which script to change the Java SDK used by profile?
managesdk.sh script is available in bin folder which will help to change the SDK.
PMT (profile management tool) is GUI to create and manage the WebSphere profiles.
I hope above helps you to get a WebSphere administrator job.
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