Is it Adelman or Adleman?

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Question
You know about RSA (Rivest, Shamir, Adelman) encryption. Asymmetric encryption and RSA specifically are regularly used in the I.T. industry. But when you search on the internet, you find many different spellings of Adelman (such as Adleman). Which is the correct spelling?

Answer
It is Adelman. The sources include page 648 of RHCSA/RHCE Linux Certification Study Guide Sixth Edition by Jang (McGrawHill) and this external site.

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How Do You Troubleshoot “TLS Error: TLS key negotiation failed to occur TLS handshake failed”?

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Problem scenario
You have a Linux server with the openvpn binary command installed. You try to start the OpenVPN client service. You see this message: “TLS Error: TLS key negotiation failed to occur TLS handshake failed.”

What should you do?

Solution
Reinstall and reconfigure the OpenVPN server. Just completely start over.
You may want to try this: https://www.cyberciti.biz/faq/howto-setup-openvpn-server-on-ubuntu-linux-14-04-or-16-04-lts/

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Helping a Loved One Through the Challenges of an Autoimmune Disease

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Helping a Loved One Through the Challenges of an Autoimmune Disease

This post below was contributed by fitshiela.com.

Autoimmune diseases impact at least 50 million Americans according to the American Autoimmune Related Diseases Association. As of now, more than 80 chronic illnesses are considered autoimmune, and the number keeps rising.

If you have a loved one who lives with an autoimmune disease,

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Using Ubuntu How Do You Make a USB Stick with an .iso (for Installing an OS) Bootable?

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Problem scenario
You are using Ubuntu with a desktop GUI. You want to create a USB stick with an .iso file to install Linux on some hardware elsewhere. What should you do?

Solution
Remove USB sticks from your computer that will not get the ISO. Why? You may accidentally overwrite one of them.

From the GUI desktop go to the Menu and search for “USB.” You may find “USB Image Writer” or “Startup Disk Creator”.

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A Budget-Friendly Resource Guide to Tech Investments for Solopreneurs

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Image via Pexels. Article brought to you by Techdeck.info.

A Budget-Friendly Resource Guide to Tech Investments for Solopreneurs

If you’re a small business owner or solopreneur, keeping overhead costs low is probably a priority. While it’s understandable to save where you can, one area you shouldn’t skimp on is technology. The right tech investments can help streamline your business operations, saving you time, stress, and money.

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Where Is the core-site.xml File in a Hadoop Installation?

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Problem scenario
You downloaded and installed Hadoop core. But you cannot find the core-site.xml file. What should you do?

Possible Solution #1
Run this: sudo find / -name core-site.xml

Possible Solution #2
Did you download the installation media with a file “-site” in its name?

Try again with a .tar.gz file without “-site” (and without “-src”) in its name:
https://dlcdn.apache.org/hadoop/core/stable/

(This is the for open source version and not a specific vendor’s implementation of Hadoop.)

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How Do You Troubleshoot “Segmentation fault” Errors in Hadoop/HDFS?

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Problem scenario
You get a “Segmentation fault” or “Segmentation fault (core dumped)” error when you run any “hdfs” command. What should you do?

Solution

Root cause
There is probably an infinite loop/recursion problem. (Segmentation faults involve writing to the stack. Eventually the memory gets filled up.) There is some configuration problem with your Hadoop / hdfs installation.

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For Databases Is a B-Tree the Same as an Index?

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Question
In the context of databases, Is a B-tree the same as an index?

Answer
For many intents and purposes they are the same.

“B-Tree is a self-balancing search tree.” Taken from
https://www.geeksforgeeks.org/introduction-of-b-tree-2/.

“B-tree is a data structure that store data in its node in sorted order.” Taken from https://dzone.com/articles/database-btree-indexing-in-sqlite.

This source says that the “B” stands for “balanced” (not “binary”): https://use-the-index-luke.com/sql/anatomy/the-tree

To learn more see this: https://www.geeksforgeeks.org/difference-between-binary-tree-and-b-tree/

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