AWS Complete practically explained python boto3 script to connect with EC2 and IAM Roles


An EC2 (Elastic Compute Cloud) instance is a virtual server in the AWS cloud. It is a scalable computing resource that enables you to run your applications and services in the cloud. IAM (Identity and Access Management) roles are AWS’s way of granting permissions to AWS services, such as EC2 instances, to access other AWS resources. By assigning an IAM role to an EC2 instance, you can give the instance the necessary permissions to perform specific tasks, such as reading from an S3 bucket or writing to a CloudWatch log. This allows you to enforce least privilege and secure access to your AWS resources.

Different components relevant to ec2 security

There are several components relevant to EC2 security:

  1. Security Groups: Used to control inbound and outbound traffic to an EC2 instance.
  2. Key Pairs: Used for secure login to an EC2 instance via SSH.
  3. Network Access Control Lists (ACLs): Used to control network traffic at the subnet level in a VPC.
  4. IAM Roles: Used to grant EC2 instances permissions to access other AWS resources.
  5. Amazon Machine Images (AMIs): Pre-configured virtual machine images that can be used to launch EC2 instances. It’s important to ensure that AMIs are securely configured before use.
  6. Encryption: EC2 instances can be encrypted using AWS Key Management Service (KMS) or using customer-managed keys in the case of EBS volumes.
  7. Monitoring: Monitoring tools such as Amazon CloudWatch and AWS CloudTrail can be used to track activity and monitor for security issues within your EC2 environment.
  8. Patch Management: Regularly patching EC2 instances is important for maintaining security and protecting against known vulnerabilities.

These are just a few of the key components of EC2 security. It’s important to consider all aspects of security when using EC2 and to continuously monitor and update your security measures to ensure the ongoing protection of your resources.

How to use these component with real time examples

Here are a few examples of how the components of EC2 security can be used in real-world scenarios:

  1. Security Groups: You can create a security group that allows SSH traffic on port 22 and HTTP traffic on port 80. Then, you can associate this security group with an EC2 instance to allow inbound SSH and HTTP traffic to the instance while blocking other traffic.
  2. Key Pairs: To secure login to an EC2 instance, you can create an EC2 key pair, download the private key file, and use it to SSH into the instance. The private key file should be protected and should not be shared with anyone.
  3. Network Access Control Lists (ACLs): You can create a network ACL that allows HTTP traffic on port 80 and HTTPS traffic on port 443. Then, you can associate this network ACL with a subnet in your VPC to allow inbound HTTP and HTTPS traffic to instances in that subnet while blocking other traffic.
  4. IAM Roles: You can create an IAM role with permissions to access an S3 bucket. Then, you can assign this IAM role to an EC2 instance, allowing the instance to read from and write to the S3 bucket without the need for hardcoded credentials.
  5. Amazon Machine Images (AMIs): Before launching an EC2 instance from an AMI, you can check the AMI for any security issues or vulnerabilities. For example, you can check for the presence of a strong password policy, up-to-date software packages, and properly configured security groups.
  6. Encryption: To encrypt data on an EC2 instance, you can create an encryption key in AWS Key Management Service (KMS) and use it to encrypt an EBS volume attached to the instance. The encrypted data will be secure both at rest and in transit.
  7. Monitoring: You can set up Amazon CloudWatch to monitor your EC2 instances for resource utilization, network traffic, and other key metrics. You can also use AWS CloudTrail to track API calls made to EC2 and other AWS services. This information can be used to detect and respond to security incidents.
  8. Patch Management: To keep your EC2 instances secure, it’s important to regularly patch them with the latest software updates and security patches. You can use AWS Systems Manager to automate this process and ensure that all instances are up-to-date.

These are just a few examples of how the components of EC2 security can be used. It’s important to understand the role that each component plays in securing your EC2 environment and to use them in combination to ensure the best possible security policy

Python boto3 script to setup ec2 with Ian and private public subnet

.attach_internet_gateway(InternetGatewayId=ig_id, VpcId=vpc_id)

Create a route table and associate it with the public subnet

route_table = ec2.create_route_table(VpcId=vpc_id) route_table_id = route_table[‘RouteTable’][‘RouteTableId’] ec2.associate_route_table(SubnetId=public_subnet[‘Subnet’][‘SubnetId’], RouteTableId=route_table_id)

Add a default route to the internet gateway in the route table

ec2.create_route( DestinationCidrBlock=’′, GatewayId=ig_id, RouteTableId=route_table_id )

Launch EC2 instance in public subnet

ec2_instance = ec2.run_instances( ImageId=’ami-0c55b159cbfafe1f0′, InstanceType=’t2.micro’, MaxCount=1, MinCount=1, NetworkInterfaces=[ { ‘SubnetId’: public_subnet[‘Subnet’][‘SubnetId’], ‘DeviceIndex’: 0, ‘AssociatePublicIpAddress’: True, ‘Groups’: [route_table[‘RouteTable’][‘Associations’][0][‘Main’]] } ], IamInstanceProfile={ ‘Name’: ‘ec2_instance_role’ } )

This script creates an IAM role with permissions to access S3, creates a VPC with a public andprivate subnet, associates an internet gateway with the VPC, launches an EC2 instance in the public subnet with the IAM role, and associates the EC2 instance with the route table associated with the public subnet. Note that this is just an example
Integration with python via aws cli

The AWS CLI can be used to interact with AWS services, including EC2, from the command line. To integrate EC2 with Python using the AWS CLI, you can use the subprocess module to call the AWS CLI commands from within a Python script.

Here’s an example of how to use the AWS CLI to launch an EC2 instance from within a Python script:

import subprocess

# Define the AWS CLI command to launch an EC2 instance
command = [

# Call the AWS CLI command from within the Python script
output =, stdout=subprocess.PIPE)

# Print the output of the AWS CLI command

this example, the AWS CLI command is defined as a list of strings and passed to the method. The output of the AWS CLI command is stored in the output variable and can be accessed via the stdout attribute. The output is then decoded from a byte string to a string and printed.

You can modify this example to include other AWS CLI commands or to perform other actions with the output of the AWS CLI commands.

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