brew install and brew update hang with error: 'refs/remotes/origin/master': unknown revision or path not in the working tree.

මේ lines දෙක use කරන්න.

rm -fr $(brew --repo homebrew/core) # because you can't brew untap homebrew/core
brew tap homebrew/core

Can anyone please tell me, what is the way to become a system engineer? What steps should I take?

සිංහලෙන් VPS එකක් හදාගන්න එක ගැන කිසිම විඩියෝ එකක් youtube එකේ තිබ්බේ නෑ. ඉතින් ගොඩක් කට්ටියත් කිව්වා පුලුවන්නම් දෙන්න කියලා.

සෝ එක නිසාම ගොඩක් කට්ටියට වැදගත් වෙයි කියලා හිතුන නිසා step by step ක්‍රියෙට් කරගන්න විදිහ ගැන විඩියෝ එකක් දැම්මා කැමති කට්ටිය බලල ඉගෙන ගන්න.

https://www.youtube.com/watch?v=H367pfpHPyw

I don't know here is the best place to post this kind a question because i just got here.
I want to begin my carrer in network enginnering and I want clear advices from those who know this paths well.

I also interested in system administration,network administration kind a thigs as well.

Can enyone help me, what should i study what kind a certifications ,degree should i get for maximum success in this field.

Thank you

What is Containerization & Why?

The Problem

When you develop a application, It may work fine on your PC or Laptop. But when you going to deploy it, Sometimes It will not work properly in production or others computer.

Reasons

Version Problems
Missing Dependencies
Other programs may disturb yours.

Because everything is on same server/PC.

Solution

To solve this issue, Developers uses a technology called Containerization.

Containerization

Containerization is a lightweight alternative to full machine virtualization that involves encapsulating an application in a container with its own operating environment. This provides many of the benefits of loading an application onto a virtual machine, as the application can be run on any suitable physical machine without any worries about dependencies.

It means, Each and every application / services can work on dedicated environment is same machine (Like Virtual Machine But Not Exactly).

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Just Image a Container & Ship. The stocks are packed into containers. And each containers are locked and shipped. The actions inside container will not effect the ship. Because container is protecting/separating outside.

Just Like that, Imagine you computer as a ship. Now you can create a separate container for Database, separate container for App, separate container for Cache and so on. And you can deploy all together in your ship (Computer).

So each services can run independently, If any service occurs, It will not effect your server.

What is Docker?

Docker one of the most famous containerization tool, use by Software Engineers. It allows you create, maintain & deploy containers easily.

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Virtualization vs Containerization

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