Create High Availability Architecture with AWS CLI

The article includes- 

- Webserver configured on EC2 Instance

- Document Root(/var/www/html) made persistent by mounting on EBS Block Device.

- Static objects used in code such as pictures stored in S3

- Setting up Content Delivery Network using CloudFront and using the origin domain as S3 bucket. 

- Finally place the Cloud Front URL on the webapp code for security and low latency.

To Perform This Task You should have an aws account and an IAM user .

STEP 1:Download aws CLI and configure it.

STEP 2: START AN INSTANCE

COMMAND : aws ec2 start-instances --instance-ids <ID_OF_YOUR_INSTANCE>

STEP 3: Create an EBS volume and then attach it to the instance.

COMMAND TO CREATE AN EBS :
 aws ec2 create volume --availability-zone <AZ_CODE> --size <SIZE> 

STEP 4 : Now attach the volume to the instance

COMMAND TO ATTACH AN EBS:
aws ec2 attach-volume --volume-id <VOLUME_ID> --instance-id <INSTANCE_ID> --device <STORAGE_NAME>

Before using this attached volume , it must be partitioned and formatted first.

( here ssh program is used to login and run the command )

STEP 5 : PARTITIONING :

COMMAND TO CREATE PARTITION:
ssh -i <KeyPair_Name> <USERNAME@IP> sudo fdisk <STORAGE_NAME>

n ( for new partition)

press enter (it will be first partition only)

press enter (it will be counting the space from initial sector)

w (save the partition and exit)

STEP 6 : FORMAT the partition with ext4 :

COMMAND : ssh -i <KEY_PAIR_NAME <USERNAME@IP> sudo mkfs.ext4 <PARTITION_NAME> 

STEP 7 : Now Install httpd server using yum command

COMMAND : ssh -i <KEYPAIRNAME> <USERNAME@IP> sudo yum install httpd -y

STEP 8 : Start the httpd service:

COMMAND : ssh -i <KEYPAIRNAME> <USERNAME@IP> sudo systemctl start httpd

Check the status of the service:

COMMAND : ssh -i <KEYPAIRNAME> <USERNAME@IP> sudo systemctl status httpd

STEP 9 : Now , Mount the /var/www/html folder to the created partition of the EBS volume

COMMAND : ssh -i <KEYPAIRNAME> <USERNAME@IP> sudo mount <Partition_name> /var/www/html

To check the web server configuration create a small code and access it through the webUI

NOTE : save the code in /var/www/html directory.

STEP 10 : Create a S3 bucket and upload some objects there.

COMMAND : aws s3api create-bucket --bucket <Bucket_Name> --region <Region_code> --create-bucket-configurationConstraint=<region_code>

STEP 11 : Add an image as an object in the bucket.

STEP 12 : Now create a cloud Front distribution with the origin as above bucket .

COMMAND : aws cloudfront create-distribution --origin-domain-name <bucket_name>

STEP 13: Add the domain name of the cloud front distribution in the html file 

Now open the web.html page in browser.