What is Bash Script?

Bash Script is a plain text file that contains the commands used in a command line.

Creating a Bash Script

Step 1: Creating an HTML page.

• Create the web page in a Notepad and save it with .html extension.

Step 2: Creating a bucket in S3.

• Move to the S3 service.
• Create a bucket in S3.

• Enter the bucket name.

• Click on the Create button.
• Click on the jtpbucket that you created and upload the index.html file in S3.
• The below screen shows that index.html file has been successfully uploaded in S3.

Step 3: Creating an IAM Role.

• Now, go to the main console and click on the IAM service.

• We create a new Role.
• Select EC2 service to access your AWS services on your behalf. Click on the Next.
• Select the AmazonS3FullAccess policy, this policy gets attached to our role.

• Click on the Next.
• Enter the role details such as Role name.

• Click on the create role.
• The below screen shows that the role has been created with the name S3AdmainAccess.

In the above screen, the role which has been checked is a newly created role.

Step 4: Creating an EC2 instance

• Move to the main console and click on the EC2 service.
• Launch an Instance.
• Choose an Amazon Machine Image. I select the Amazon Linux AMI 2018.03.0 (HVM).
• Choose an Instance type. I choose a t2.micro type.
• Configure the Instance details. Select the IAM Role as S3AdminAccess and keep other settings as default.

Bash scripts are added in an Advanced Details.

• Add Storage to your instance. Root is a default volume, and I am not adding new volume.

• Click on the Next.
• Add a tag.

• Configure Security group.

The above screen shows that we created a new security group whose name is WebServer.

• Review and Launch.
• Select an existing key pair or create a new key pair. I contain a key pair.

• Finally, my EC2Instance has been created.
• Open the Putty.
• Enter your Host Name such as [email protected]
• Click on the auth in SSH appearing on the left side of the putty, attach the key pair.ppk file to it.
• Run the command sudo du to reach the root level.
• Run the command yum update -y to update an EC2 instance.
• Run the command yum install httpd -y to install an Apache server.
• Start the server by running the command service httpd start.
• Move to the directory cd /var/www/html.
• Copy all the commands that we saw till now to the Notepad file.

The above screen shows the bash script.

Step 5: Test the Bash Script

• First, we delete the instance that we created.

• Now we create a new instance.
• Launch an instance.
• Choose an Amazon Machine Language (AMI). I choose the Amazon Linux AMI 2018.03.0 (HVM).
• Choose an Instance type. I choose a t2.micro type.
• Configure Instance details. Set IAM Role as S3AdminAccess and paste the bash script in Advanced details.

• (Optional) Add storage.
• Add tags.
• Configure Security Group. I select a default group.
• Review instance launch.
• After launching an instance, paste the public IP address to a clipboard of the web browser. You will see the output shown below:

We conclude that copying the data from S3 to EC2 becomes easier by using Bash scripts.