Cloning?

Amarnath Cherukuri Cloning is the process
of copying an existing entity to a different location while preserving its state.
Cloning can be performed on a Middleware home and certain Oracle Fusion
Middleware components, such as Oracle SOA Suite, Oracle HTTP Server, Oracle
Internet Directory and Oracle Virtual Directory.
Situations in which
cloning Oracle Fusion Middleware will be useful :
· Creating
a Middleware home that is a copy of a production, test, or development
environment.
· Cloning
enables to create a new Middleware home with all patches applied to all of the
Oracle homes and the WebLogic Server home in a single step. This is in contrast to separately installing
and applying any patches to the WebLogic Server home and separate Oracle homes.
· Preparing
a "gold" image of a patched Middleware home and deploying it to many
hosts.

Admin Server Starting Problem

I am facing problem while starting the admin server in weblogic. It is windows 7 machine. The moment when i start admin server, it is shutting down automatically. Here i have attached the domain and admin server log. 

Satheesh Kotla Use this command in Unix.... Nohup ./startweblogic.sh &

What is swap memory or swap space?

• 

  Mohammad Faisal Zakarneh When ur physical memory isn't enough to accommodate the information, it swaps space to and from the disk .. the space in the disk called swap memory

  
  
• 

  Suneel Kumar Kottapalli 
  A swap space is a certain amount of space used by Linux to temporarily hold some programs that are running concurrently. This happens when RAM does not have enough memory to hold all programs that are executing.

  
  
• 

  Parvath Reddy Swap space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space. While swap space can help machines with a small amount of RAM, it should not be considered a replacement for more RAM.

What are the prerequisites we need to check before going to install Weblogic and apache?

Gaguturi Kamalbee
 the prerequesties for oracle weblogic server are minimum 2GB RAM,
2GB free disk space and
1GHz cpu processor and also when installation, 
please make sure that the tmp directory has enough space bcoz the installation takes 2.5 times the amount of tmp space for the installed file,
and we check the prerequesties for WLS we can use top, du -sh,df -kh, free and uname also.

Raja Reddy 
1. Based on application size 
2. Future deployment plans
3. Traffic flow of app 
4.No. of nodes we need to create and RAM of each node 
5. uname, whoami, free, top, du df will useful to check the prerequesties.......................

Useful links Weblogic Admin

http://www.togotutor.com/weblogic/

http://174.37.163.146-static.reverse.softlayer.com/weblogic/

http://weblogictutorial.tripod.com/weblogic_6_1.htm

http://weblogicserveradministration.blogspot.in/2012/11/weblogic-server-basic-concepts-for.html

http://erpschools.com/weblogic-video-tutorials

http://www.weblogicbeginner.com/

http://docs.oracle.com/cd/E12839_01/web.1111/e13752/toc.htm

http://middlewaretimes.blogspot.in/

http://javaconceptoftheday.com/home/

http://www.coderanch.com/forums/f-40/BEA-Weblogic

http://www.tek-tips.com/threadminder.cfm?pid=830

https://community.oracle.com/community/fusion_middleware/weblogic

http://docs.oracle.com/cd/E13222_01/wls/docs81/faq/index.html

http://weblogic-wonders.com/weblogic/2012/02/21/general-weblogic-server-interview-questions/

http://weblogic4you.blogspot.in/

http://biemond.blogspot.in/

http://middlewaretimes.blogspot.in/2014/08/weblogic-interview.html

http://middleware-administration.blogspot.in/

What is DR (Disaster Recovery)?

Tatarao Vana Disaster recovery is nothing but exact copy of config of production environment..in case of any issues you can divert traffic from production server to diaster recovery server so that you can troubleshoot the issue without any business impact...i can say disaster recovery is a backup prod environment & exact mimic of prod in the view of configuration

Mohammad Faisal Zakarneh how to copy the files why are they in use?

November 5 at 11:22pm · Like

Kalyana Rama Charan DR is a complete backup of running Production Environment. Whenever we get an any alert that something is going to happen wrong then immediately we gong to take those backup completely of Production. According to My knowledge Production servers are same as DR server..i.e., replica of those.

November 5 at 11:22pm · Unlike · 1

Kalyana Rama Charan It all depends upon the company and the tool which they are using to take backup/SnapShots of those copy of files.

November 5 at 11:23pm · Like

Tatarao Vana Its not copying anything...while doing build of prod servers you will also build the backup/ disaster recovery servers...

November 5 at 11:24pm · Like

Mohammad Faisal Zakarneh Tatarao Vana so how configuration made in production will be reflected on DR?

November 5 at 11:25pm · Like

Tatarao Vana Forexample A is a production server and you want to create a backup server named B. Then you need to have all the resources like physical machines and servers configured...i can say you have to do configuration two times one for prod(A) and one for backup(B)

November 5 at 11:29pm · Like

Mohammad Faisal Zakarneh Tatarao Vana Dear I understand that, but after making changes to server A, how will it be reflected on server B in the future?

November 5 at 11:31pm · Like

Tatarao Vana Before application goes live make sure both environments are ready...divert the traffic to prod and keep backup server as backup then if any issues comes divert traffic to backup and continue troubleshooting prod without business impact...

November 5 at 11:31pm · Like

Tatarao Vana You didn't understand what i said...A and B will be built at a time and we will test those before it goes live...those are like two different items with exact config...if one fails will use another

November 5 at 11:34pm · Edited · Like

Mohammad Faisal Zakarneh I totally understand what are you saying, the thing is, if after going live I made some changes on server A, how will they be reflected on Server B

November 5 at 11:33pm · Like

Tatarao Vana Both will be up and running and will sync each other...only traffic will go to prod server

November 5 at 11:36pm · Like · 1

Mohammad Faisal Zakarneh Tatarao Vana can you please describe the technology or the configuration that will make them in sync?

November 5 at 11:37pm · Like

Tatarao Vana I am not exaclty sure...but it's not only related to servers its also related to Databases etc...everything will have its backup/recovery servers to it will sync each other...so thats why we never have dataloss and outage

November 5 at 11:40pm · Like · 1

Kishore Setti Thanks Tatarao Vana for sharing more info.

November 5 at 11:43pm · Like

Tatarao Vana You're welcome 

November 5 at 11:44pm · Like

Mohammad Faisal Zakarneh Tatarao Vana .. thanks for answering my question, but I'm still not convinced, for example, in DATABASE, we use Dataguard to create standby database so changes to production database will be reflected on DR site, in weblogic, after creating two identical server (A & B), how changes will be reflected from A to B?

November 5 at 11:51pm · Edited · Like

Tatarao Vana I am not sure how they sync each other but every prod database will have its backup database. So backup servers will connect to backup databases...everything in the same fasion...i can say its a process of mirroring of prod environment with exactly the same config

November 5 at 11:54pm · Like

Mohammad Faisal Zakarneh Tatarao Vana this is exactly what I wanted to tell you 

I'm dba as well as wls admin ,, I have worked in an environment like this, configuration should be reflected by os cluster or manually. 

November 5 at 11:58pm · Like

Tatarao Vana Will update you how exactly they will sync by asking my teammates...

Yesterday at 12:01am · Like · 1

Mohammad Faisal Zakarneh Thanks a lot 

Yesterday at 12:02am · Like

Afzal Haque Is it Master and Slave concept???....You can put http redirection on gateway webserver to redirect to DR webserver and then it is taken care back by back end appserver and db and then back....

Yesterday at 12:52am · Edited · Like

Chandra Varagani Generally, we make some sync scripts to update the DR servers also whenever a change goes into live env.

Yesterday at 2:02am · Like

Mohammad Faisal Zakarneh Chandra Varagani .. that's it , you will end up copying config.xml and some other files to the dr site

Yesterday at 2:07am · Like

Chandra Varagani Mohammad Faisal Zakarneh: when you have a replica of your env... then you dont need to copy anything as it is already replica/mirror. and sync scripts will copy everything to that replica(DR). thats it.

Yesterday at 2:10am · Like · 1

Mohammad Faisal Zakarneh My point is, it will be copied and should be scheduled.
can you please share the script that will do such a thing

Yesterday at 2:14am · Like

Afzal Haque There is something called replication ..in the master and slave concept in DBM. So the master sever or your Prod DB
will create bin logs which will contain all the current events of the database and this log is read by the slave db or your DR DB to get the DB of DR sync with Prod Db.

20 hrs · Unlike · 1

Mohammad Faisal Zakarneh Afzal.. I'm not talking about database I know about database.. I'm talking about Weblogic.. for example if you added a managed server on the prod .. how will it be reflected on the dr

18 hrs · Like

Tatarao Vana Then u have to add the same managed node in bcp too...whatever you want to do...you have to do it in build state not after going live...i mean activities like adding managed nodes and extra config...if you want to do that then shedule the config changes for both prod and backup in two different time intervals without affecting business

16 hrs · Unlike · 2

Mohammad Faisal Zakarneh That's the idea I wanted to deliver since yesterday.. Thx dear

14 hrs · Like

Afzal Haque Yes exactly.....!!..

14 hrs · Like