High Availability Architecture with AWS Command Line Interface(CLI)

ARTH Task-6

Task Description

• 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.

1. Install HTTPD over Redhat OS. The command for installing the OS goes as follows:

yum install httpd

After successful installation of the HTTPD, Start the httpd services and check the working status of the server. The command for the same goes as follows:

systemctl start httpd
systemctl status httpd

Following is the output of all the above commands:

• Configure the AWS-CLI by using the command with the output attached as below:

aws configure

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

The next step is to attach an EBS Volume to the /var/www/html folder to make the data persistent.We can use the below command to create an EBS Volume of 1GiB

aws ec2 create-volume --availability-zone --size --volume-type gp2

Now we can attach the above created EBS volume to the desired instance using the below command and the CLI and GUI outlook is as belows:

aws ec2 attach-volume --device sdb -- instance-id instance id --volume-id volume-id

In order to check if the volume is attached or not we can we can use the below command

fdisk -l

The output of the command is as follows:

Now we can use the following command to get inside the /dev/xvdb directory.The command is as follows with the desired output below:

fdisk /dev/xvdb

Now that we are in the desired directory we can create a new partition.We can press "n" to create a new partition and "p" for primary partition.The output is as below:

Now we have to format the partition using the below command

mkfs.ext4 /dev/xvdb1

The output of will be seen as follows:

Now we have to mount the partition to the /var/www/html folder and in order to check the attached disk we can use the below commands to which the output will be as follows:

mount /dev/xvdb1 /var/www/html

df -h

3.Static objects used in code such as pictures stored in S3

Now we have to use the AWS CLI to create a S3 bucket the command for the same goes as follows:

aws s3 mb s3://bucketname --region

Now we can upload the desired data to the bucket and set the permissions to public

aws s3 cp (location) (name of object) s3://(bucketname)/imagename.png --acl public-read

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

Now we have to create a distribution in cloud front to distribute the data to all Edge Locations of AWS by using the below command and the below is the output:

aws cloudfront create-distribution --origin-domain-name bucketname.s3.amazonaws.com

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

The last step is to create a HTML code and specify the cloudfront url in the image tag.The HTML code goes as follow:

Now check the final results by using the following

http://IP/FileNamw.html

The final result are as follows