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Amazon EC2

How do I list all instances in my region using AWS CLI?

by Roy "rat" Tokeshi on

To list all instances in the AWS CLI, you can use the aws ec2 describe-instances command. Here’s an example:

aws ec2 describe-instances

This will return a list of all instances in your default region, along with their details such as instance ID, instance type, status, and more.

If you want to filter the results based on certain criteria, you can use various filters with the --filters option. For example, if you only want to list instances with a specific tag, you can use the following command:aws ec2 describe-instances --filters "Name=tag:Name,Values=my-instance"

This will only return instances that have a tag named “Name” with a value of “my-instance”. You can modify the filter to suit your needs.

Note that you’ll need to have the appropriate permissions to run this command. If you encounter any issues, check your IAM user’s permissions or consult with your AWS administrator.

To only get the output of just instance IDs in the AWS CLI, you can use the --query parameter with a JMESPath expression. Here’s an example command:

aws ec2 describe-instances --query 'Reservations[].Instances[].InstanceId' --output text

This command uses a JMESPath expression to query the InstanceId attribute of each instance and return only that value. The --output parameter is set to text to ensure that the output is in plain text format.

The result will be a list of instance IDs.

Remember that you can run was CLI commands at the bottom of the console by enabling CloudShell.

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Amazon Web Services (AWS)

How Can I Create A Gateway Endpoints For Amazon S3 using BASH

by Roy "rat" Tokeshi on

You can create a gateway endpoint for Amazon S3 using the AWS CLI. Here’s an example of a bash script that creates a gateway endpoint for S3:

#!/bin/bash

# Set the AWS CLI region
aws configure set default.region us-west-2

# Define the VPC ID and the subnet IDs
vpc_id="vpc-12345678"
subnet_ids="subnet-12345678 subnet-23456789"

# Create the gateway endpoint for Amazon S3
aws ec2 create-vpc-endpoint \
    --vpc-id vpc-1a2b3c4d \
    --service-name com.amazonaws.us-east-1.s3 \
    --route-table-ids rtb-11aa22bb

In this example, replace vpc-12345678 with the ID of the VPC in which you want to create the endpoint, replace subnet-12345678 and subnet-23456789 with the IDs of the subnets in which to create the endpoint, and replace sg-12345678 with the ID of the security group to associate with the endpoint.

The aws ec2 create-vpc-endpoint command creates the gateway endpoint for Amazon S3, using the specified VPC ID, subnet IDs, security group ID, and endpoint type. Once the endpoint is created, you can use it to access Amazon S3 resources from instances within your VPC without using the public internet.

Note: You will need to have the necessary IAM permissions to create VPC endpoints in order to run this script. You can find more information on the necessary IAM permissions in the AWS documentation.

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