Delete resources that sit idle

How to do it

List disks attached to nothing, unused public addresses and load balancers with no targets. Add snapshots older than 90 days and servers stopped for 14 days. Tell the owner from the tags. Stop development servers at night and on weekends. Set lifecycle rules on buckets, so old files move to cheaper storage or expire.

Example

import boto3

ec2 = boto3.client("ec2")
volumes = ec2.describe_volumes(Filters=[{"Name": "status", "Values": ["available"]}])["Volumes"]
for volume in volumes:
    owner = next((t["Value"] for t in volume.get("Tags", []) if t["Key"] == "owner"), "no owner")
    print(volume["VolumeId"], volume["Size"], "GiB", owner)
addresses = [a["PublicIp"] for a in ec2.describe_addresses()["Addresses"] if "AssociationId" not in a]
print("Unused addresses:", addresses)

import { EC2Client, DescribeVolumesCommand, DescribeAddressesCommand } from '@aws-sdk/client-ec2';

const ec2 = new EC2Client({});
const { Volumes } = await ec2.send(new DescribeVolumesCommand({ Filters: [{ Name: 'status', Values: ['available'] }] }));
for (const volume of Volumes) {
  const owner = volume.Tags?.find(tag => tag.Key === 'owner')?.Value ?? 'no owner';
  console.log(volume.VolumeId, volume.Size, 'GiB', owner);
}
const { Addresses } = await ec2.send(new DescribeAddressesCommand({}));
console.log('Unused addresses:', Addresses.filter(address => !address.AssociationId).map(address => address.PublicIp));

How to check

The weekly report lists no resource that was already on last week's report and had no objection.