added aws_ec2_terminate_instance_by_name.sh
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#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2024-08-27 11:28:25 +0200 (Tue, 27 Aug 2024)
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#
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# https///github.com/HariSekhon/DevOps-Bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/HariSekhon
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#
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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srcdir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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# shellcheck disable=SC1090,SC1091
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. "$srcdir/lib/aws.sh"
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# shellcheck disable=SC2034,SC2154
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usage_description="
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Terminate an AWS EC2 instance by name
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Investigate instance names quickly using adjacent script aws_ec2_list_instance_states.sh
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$usage_aws_cli_required
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"
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# used by usage() in lib/utils.sh
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# shellcheck disable=SC2034
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usage_args="<instance_name>"
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help_usage "$@"
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num_args 1 "$@"
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instance_name="$1"
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timestamp "Determining EC2 instance ID for name '$instance_name'"
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instance_id="$(aws ec2 describe-instances \
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--filters "Name=tag:Name,Values=$instance_name" \
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--query "Reservations[*].Instances[*].InstanceId" \
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--output text)"
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if [ "$(awk '{print NF}' <<< "$instance_id")" -gt 1 ]; then
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echo "More than 1 instance ID returned, aborting for safety!"
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echo
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echo "Instance ID found:"
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echo
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echo "$instance_id"
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echo
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exit 1
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fi
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timestamp "Determined EC2 instance ID for name '$instance_name' to be '$instance_id'"
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timestamp "Doing reverse lookup on instance ID for safety"
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# want * to remain in AWS query rather than evaluated in shell
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# shellcheck disable=SC2016
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returned_name="$(aws ec2 describe-instances \
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--instance-ids "$instance_id" \
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--query 'Reservations[*].Instances[*].Tags[?Key==`Name`].Value' \
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--output text)"
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if [ "$returned_name" != "$instance_name" ]; then
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die "ERROR: reverse lookup of instance id '$instance_id' returned '$returned_name' instead of expected '$instance_name' - aborting for safety"
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fi
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timestamp "Reverse lookup on instance ID for safety correctly returned name '$returned_name'"
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timestamp "We definitely have the right instance ID"
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timestamp "Checking instance state"
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instance_state="$(
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aws ec2 describe-instances --instance-ids "$instance_id" --query 'Reservations[*].Instances[*].State.Name' --output text
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)"
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if [ "$instance_state" = "terminated" ]; then
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timestamp "Instance '$returned_name' with id '$instance_id' is already terminated"
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exit 0
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elif [ "$instance_state" != "running" ]; then
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die "Instance state '$instance_state' was not expected - is not 'terminated' or 'running' - aborting for safety"
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fi
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echo >&2
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read -r -p "Do you want to terminate instance '$returned_name' with id '$instance_id'? (y/N) " answer
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check_yes "$answer"
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aws ec2 terminate-instances --instance-ids "$instance_id"
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