Created
March 27, 2015 15:43
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Determine oldest instance inside AutoScalingGroup using LaunchTime
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| GROUP=$(ec2-describe-tags --filter "resource-type=instance" --filter "resource-id=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)" --filter "key=aws:autoscaling:groupName" | cut -f5) | |
| IDS=$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names $GROUP --query 'AutoScalingGroups[0].Instances[].InstanceId' --output text | sed 's/\t/ /g') | |
| IPS=$(aws ec2 describe-instances --instance-ids $IDS --region us-east-1 --query Reservations[].Instances[].PrivateIpAddress --output text | sed 's/\t/,/g') | |
| LAUNCH_TIME=$(date -d $(aws ec2 describe-instances --instance-ids `curl -s http://169.254.169.254/latest/meta-data/instance-id` --query Reservations[].Instances[0].LaunchTime --output text)) | |
| LAUNCH_TIMES=$(aws ec2 describe-instances --instance-ids $IDS --region us-east-1 --query Reservations[].Instances[].LaunchTime --output text) | |
| OLDEST=0 | |
| for time in $LAUNCH_TIMES; do | |
| if [[ `date -d $time` < $LAUNCH_TIME ]]; | |
| then | |
| OLDEST=1 | |
| fi | |
| done | |
| exit $OLDEST |
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