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stefango/freeme.sh

Created October 31, 2020 08:06
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autochange elastic ips by aws cli 2
Raw
freeme.sh
# ref: https://wangfanggang.com/AWS/aws-cli-renew-ip/
FilterStr="Name=tag-key,Values=ec2"
# get ec2 instance id by tag
InstanceId=$(aws ec2 describe-instances --filters $FilterStr --query "Reservations[*].Instances[*].[InstanceId]" --output text)
OldPublicIpAddress=$(aws ec2 describe-instances --filters $FilterStr --query "Reservations[*].Instances[*].[PublicIpAddress]" --output text)
# generate an elastic ip address
NewPublicIpAddress=$(aws ec2 allocate-address --domain vpc --query "PublicIp" --output text)
# associate an elastic ip to an existed ec2 instance
result=$(aws ec2 associate-address --instance-id $InstanceId --public-ip $NewPublicIpAddress)
# release an existed elastic ip address
aws ec2 release-address --allocation-id $(aws ec2 describe-addresses --filters "Name=public-ip,Values=$OldPublicIpAddress" --query "Addresses[*].[AllocationId]" --output text)
echo "New Elastic IP: "$NewPublicIpAddress
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