Boto3 not starting an instance

What will you learn?

In this tutorial, you will delve into the common issue of Boto3 failing to start an EC2 instance. You will gain insights into troubleshooting this problem effectively and learn how to rectify it with a detailed solution.

Introduction to the Problem and Solution

Encountering issues when attempting to start an EC2 instance using Boto3 in Python can be frustrating. Various factors such as misconfigurations or inadequate permissions can lead to instances not launching as expected. However, fear not! This guide is here to assist you in resolving this issue seamlessly.

To address this problem, we will analyze the code responsible for initiating an EC2 instance through Boto3. By grasping how Boto3 interacts with AWS services and ensuring correct configurations, you can successfully launch your EC2 instances without any hindrances.


import boto3

ec2 = boto3.client('ec2', region_name='your_region')

response = ec2.start_instances(InstanceIds=['your_instance_id'])
print(response)  # Display response from attempting to start the instance

# For more information on Boto3 and AWS services, visit [](

# Copyright PHD


In the provided code snippet: – We import the boto3 library to interact with AWS services. – A client for Amazon Elastic Compute Cloud (EC2) is created with a specified region. – Using start_instances(), we attempt to start an instance by providing its unique ID. – The response from our request is displayed, indicating success or any encountered errors.

By following these steps and ensuring accurate parameters like region name and instance ID are supplied, troubleshooting issues related to starting instances using Boto3 becomes efficient.

    1. How do I install Boto3 in Python? To install Boto3 in Python, use pip: pip install boto.

    2. Can I start multiple instances simultaneously using Boto3? Yes, you can start multiple instances at once by passing a list of Instance IDs when calling start_instances().

    3. What permissions are required for starting EC2 instances with Boto3? Ensure your IAM user has necessary permissions like ec2:StartInstances for initiating EC2 operations via Boto3.

    4. Why am I getting ‘Access Denied’ error when trying to start an instance? This error usually results from insufficient IAM permissions assigned to your user. Check your IAM policies for required access rights.

    5. How do I troubleshoot if my instance is still not starting after executing the code? Verify that your security groups permit inbound/outbound traffic needed for your instances. Also check for ongoing maintenance events affecting your resources.


Resolving challenges related to launching EC2 instances through BOTO in Python involves understanding essential concepts like proper instantiation settings and necessary permissions within the AWS environment. By adhering to best practices outlined above & exploring additional details on, users can overcome obstacles associated with initializing their cloud resources effortlessly.

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