How to configure iSCSI disks

Disks of one host can be accessed by another host in network with various protocols. iSCSI is one of the protocols which can be used for the purpose.
Server has to be configured to share the disk with specific clients and clients have to be configured to access the server disks as though they are local to the host.
Server configuration – details can be found @ https://www.learnitguide.net/2015/07/install-configure-iscsi-target-server.html
Client configuration – details can be found @ https://www.learnitguide.net/2015/07/how-to-access-or-map-iscsi-lun-volume.html

Demo on how to configure can be found @ https://www.youtube.com/watch?v=elWYb2n5dLA

How to configure DNS in Unix

DNS service is used for name resolution. Most of the enterprises have their own DNS server for resolving hosts within the organization (not connected to internet). We feel configuring DNS server is a complicated task but is not. If you ever have to configure a DNS server refer to the video . It’s a 10 min short video with example on how to configure a DNS server and add entries of other hosts in the network for hostname resolution.

Local peering gateway

If you are looking for how to connect two VCN’s in Oracle cloud, check the video .It’s a 10 mins short video which explains how to connect two VCN’s with example.

Project lombok

lombok library helps in getting rid of lot of boilerplate code like getters,setters,constructors, hashcode, tostring, equals etc… it reduces the number of lines of code to written. More details of the project can be found @ https://projectlombok.org/ . You can also refer to short demo projects in youtube.

Hub router and switch

Quite often the distinction between the three hub, router and switch is not clear from various articles in net. I found the short video explains the three cleary. Hope this helps.

Books Books n Books

I left my previous organisation Microfocus (formerly Hewlett Packard Enterprises) and all of a sudden i had ample time to do whatever i want. Started reading again and read couple of books before actual work started in my new company (Oracle). This time not physical copy of books but in Kindle (Thanks to my brother Dr. Ravi who lent it to me). Bought Kindle unlimited plan and read

a. Think Straight by Darius Foroux – goodread

b. Win your own battles by Darius Foroux – goodread

c. 30 Interactive brain teasers by Puzzleland – goodread

d. The four hour work week by Timorty Ferriss – goodread

e. Top 10 Fixed return option trading strategies byKavita Mehatani – goodread

f. Day Trading made easy by Latthew R Kratter – goodread

6 books in a span of month. Felt really good. What next ? Started reading for stuff required for new job 🙂

File and Directory permission

What’s the default permission of newly created file/directories in unix ? This can be different in different hosts based on umask value.
Each OS has default permission for newly created files and directories. But this can be changed using umask. umask value can be changed by administrators so that the default file/directory permission are different than the one used by OS. Following two articles provide explanation of umask and it’s affect on newly created file/directory permission.

https://www.computerhope.com/unix/uumask.htm
http://wintelguy.com/umask-calc.pl

Catalyst

by Chandramouli Venkatesan

A must read for all professionals. This is one of the top rated books and I would recommend all to read.
I am sure one can make lot of corrections in his/her career from where they stand now and move higher up in the ladder by adopting the principles explained in book.

Thanks a lot to Chandramouli for such a wonderful career guidance book.

I Have a Dream

by Rashmi Bansal
Who is an entrepreneur?. is it only individuals who have built big corporate’s? No, there are many social entrepreneurs whom we do not know about.

Author has provided details of 20 social entrepreneurs who have done exceptional work for the good of society. There are so individuals around us with selfless motive serving for the betterment of society. I was really surprised with the commitment of these individuals. I think, if these individuals were in politics, our society would have improved to a great extent.
Most of them have built organizations/NGOs which serve for betterment of backward class citizens with their time, effort and money. These social entrepreneurs have studied in IIT and IIM’s and have taken up the task of serving the society which is really surprising. If they would have taken up a corporate job, i am sure they would have earned better name and fame. This boils down to, whatever it may be “follow your dream”.
I am sure, with the help of these organizations many individuals would have reached greater heights or are having a better standard of leaving. Thanks to all the social entrepreneurs.

Personally i appreciate all the work these individuals have done and will try to keep my social commitment too.

This is definitely a book to read.

Distributed System

I have viewed all 24 lectures (link below) of “Distributed Systems” by Prof. Keshav, Waterloo University and would recommend all who are interested in the system to listen too. Each of the lecture comes with bundle of information. Prof co-relates most of the use cases with real life scenarios which makes it easy to understand and remember. I am sure, listening to the lecture will definitely enhance the knowledge on the subject.