About cloud, EC2 instance and its components
Welcome to my DevOps blog! My name is PAWAN JD BHAGAT, and I am a passionate DevOps Engineer with 6+ years of experience in the field. I created this blog to share my knowledge, experience, and insights on all things related to DevOps.
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Cloud computing is the on-demand delivery of IT resources (compute, storage, applications, etc) through a cloud platform AWS via the internet with pay-as-you-go pricing.
Accessing IT resources provided by the cloud providers through the web.
Key features
On-demand: - Whenever/whatever we need, we get it immediately
Scalable: - Increase and decrease the configuration as per the requirement
Pay only whatever you use
EC2
Amazon Elastic Compute Cloud
EC2 is one of the famous web services. By using it we can launch any number of instances (Servers) as per our required configuration within a fraction of a minute.
- After launching an instance, we can increase and decrease the configuration as per our requirement without stopping the instance.
To Launch an instance, we need to select below
AMI (Amazon Machine Image)
AMI is an operating system in AWS
AWS has provided some pre-defined O.S. for windows, Linux, and Mac.
We have to choose O.S. from AWS provided list only.
We can't bring any O.S. from outside into AWS.
Instance type
Here we are going to choose CPU cores and RAM.
AWS is giving them as pairs.
AWS paired the best possible combination form which we get maximum performance.
These pairs we called instance type.
EBS (Elastic Block Storage)
EBS is simply a hard disk that we attached to an instance.
Here we can choose any amount of hard disk.
Here we can keep both operating systems as well as objects (mp3, mp4, pictures, documents).
Tag
Tag is the full name we give to the EC2 instance for identification.
Security Groups
Security groups deal with ports.
ports are like a door to your instance.
We have a total of 0-65535 ports.
All these ports are dedicated for some special purpose
Key
Key pairs are just like a password, but it's a file in AWS.
It generates two types of keys .PEM (for use with openSSH) and .PPK (for use with putty)
