Fundamentals of EC2 - Elastic Compute Cloud

 EC2 = Elastic Compute Cloud

 AWS Cloud Computing provides more than 200+ various services. EC2 is one of it. It is very nice and most popular service by AWS Cloud.   

-       It is Virtual Server – also known as “Instance”

 

-       We can start / launch new Server within few minutes (In any Region/AZ) 

 

-       1 Year FREE Tier account – 750 hr / month with Linux OS and t2.micro instance type 

 

-       With the help of EC2 service we can quickly launch new VM (Virtual Machine) and for creating new VM we can choose EC2 instance from approximately 350+ various EC2 types 

-       Linux, Windows, Amazon Linux OS templates readily available, so that we can create new VM within few minutes 

 

 

Few Key Terms of EC2

 

1.     Instances

2.     Instance Type

3.     Amazon Machine Image ( AMI )

4.     Key Pair

5.     Instance Store Volumes

6.     EBS Volume

7.     Security Groups

8.     Elastic IP Address

9.     Tags  

 

 

 

DevOps Skills Trends across the world !

 DevOps 

If we do analysis of last 5 years data for DevOps and various skill sets around it, we will come to know that, it is in very high demand across the globe. 

 

5 Years search history for DevOps Keyword 

What is lost+found directory on Linux?

Many times while working on Linux system we come across the "lost+found" directory. 

So what is this directory? What is use of this directory? Let's try to understand it.  

"lost+found" directory on Linux Server

/lost+found directory can be accessed by “root” user on Linux Server

Do sudo su - and become root user

This directory contains recovered bits of corrupted files here​

Let’s understand with some scenario

Sometime  power off of Linux server​ happen  abruptly, and it might be possible that some data writing operations are in progress on server.

​Now, when we restart our Linux Server next time, the Linux FileSystem will do "FileSystem Check" with fsck command and all corrupted data / files will be placed in "lost+found" directory 

fsck command on Linux 

If we check the man page of "fsck" command, we will find that, it is mainly used for repairing various Linux File System

fsck - check and repair a Linux filesystem

fsck - This command find out some bits / orphaned objects / corrupted files on Linux / Unix Filesystem​

After completing its operation fsck, command will store all such recovered files in "lost+found" directory.