AWS Classroomnotes 24/Sep/2023

Activity

• Commands to get
  • instance ids aws ec2 describe-instances --query "Reservations[].Instances[].InstanceId"
  • tags: aws ec2 describe-instances --query "Reservations[].Instances[].Tags"
  • private ip addresses: aws ec2 describe-instances --query "Reservations[].Instances[].PrivateIpAddress"
• Apply a tag env=dev to some ec2 instances

• Sample script written

#!/bin/bash

function apply_tags_to_all() {
    # Get all my ec2 instances optional
    instances=$(aws ec2 describe-instances --query "Reservations[].Instances[].InstanceId" --output text)
    echo "found instaces are $instances"
    aws ec2 create-tags --resources $instances --tags Key=env,Value=dev
}

# right now this works only for tag env and value dev
function get_instances_by_tag() {
    instances=$(aws ec2 describe-instances --filters "Name=tag:env,Values=dev" --query "Reservations[].Instances[].InstanceId" --output text)
    echo $instances
}


# get all ec2 instance ids based on tag value

instances=$(get_instances_by_tag)
echo "found instances $instances"
aws ec2 stop-instances --instance-ids $instances

#aws ec2 start-instances --instance-ids $(instances)