Wednesday, 25 July 2018

AWS interview questions and answers for 1 year experienced

AWS interview questions and answers for 1 year experienced

Question: What is the difference between Amazon S3 and Amazon EC2 instance?
Amazon S3: It is just storage service where you can upload photo, video, audio, pdf etc any type of files upto 5 terabytes (5Tb).
It store data as a object, you can't install any software like MS office, VLC player, Adobe etc.

You can import/export data from/to S3 and also can access via cloudfront.

EC2 instance: Launching a EC2 instance is similar a create virtual computer (windows, linux) where you can install software unlike S3. You can customize the configuration like volume(storage), RAM, CPU etc.

Question: How to copy files from one bucket to another?
  1. Login to SSH using ip address and ppk file.
  2. Make sure, it have AWS S3 access privilege
  3. Now just execute following command
    aws s3 sync s3://source-bucket s3://destination-bucket --exclude *.tmp

Question: Can we change the availability zone of an existing EC2 t1.micro instance?
No, you can not do.
for this, you need to launch new instance from existing instance.

Question: What is Availability Zones?
Amazon EC2 is hosted in world-wide.
These locations are composed of regions and Availability Zones.
Each region has multiple, isolated locations known as Availability Zones.

Question: How to move files directly from one S3 account to another?
Bucket Explorer works on Mac
S3 Browser works on windows.

Question: AWS Difference between a snapshot and AMI?
A snapshot is of an EBS volume where you save at a certain point of time.
An AMI is similar, but its for the EC2 instances themselves. you can create a AMI but can't do snapshot.

Question: What is the maximum length of a filename in S3?
1024 characters.

Question: How to move a domain from Godaddy to AWS Route 53? =>Login on your aws console
=>Click on Route 53
=>Create Hosted Zone
=>Select your new created host title
=>click "Go to Record Sets", take note of the nameservers;

=>Login on your Godaddy account
=>Select your domain
=>Go to Nameservers and click SetNameservers;
=>paste all the four you took from Go to Record Sets;

Question: How to transfer files between from AWS ec2 to S3
aws s3 cp myfolder s3://mybucket/myfolder --recursive

Question: How to transfer files between from S3 to EC2
aws s3 cp s3://mybucket/myfolder myfolder  --recursive

Question: Question: What is private hosted zone?
A private hosted zone is a container that holds information about how you want Amazon Route 53 to respond to DNS queries for a domain

Question: What is the AWS Storage Gateway service?
The AWS Storage Gateway service enables hybrid storage between on-premises environments and the AWS Cloud.