AWS S3: how do I see how much disk space is using

Question

The command line tool gives a nice summary by running:

aws s3 ls s3://mybucket --recursive --human-readable --summarize

Yippe - an update to AWS CLI allows you to recursively ls through buckets...

aws s3 ls s3://<bucketname> --recursive  | grep -v -E "(Bucket: |Prefix: |LastWriteTime|^$|--)" | awk 'BEGIN {total=0}{total+=$3}END{print total/1024/1024" MB"}'

To find out size of S3 bucket using AWS Console:

1. Click the S3 bucket name
2. Select "Management" tab
3. Click "Metrics" navigation button
4. By default you should see Storage metric of the bucket

s3cmd can show you this by running s3cmd du, optionally passing the bucket name as an argument.

The AWS CLI now supports the --query parameter which takes a JMESPath expressions.

This means you can sum the size values given by list-objects using sum(Contents[].Size) and count like length(Contents[]).

This can be be run using the official AWS CLI as below and was introduced in Feb 2014

 aws s3api list-objects --bucket BUCKETNAME --output json --query "[sum(Contents[].Size), length(Contents[])]"

On linux box that have python (with pip installer), grep and awk, install AWS CLI (command line tools for EC2, S3 and many other services)

sudo pip install awscli

then create a .awssecret file in your home folder with content as below (adjust key, secret and region as needed):

[default]
aws_access_key_id=<YOUR_KEY_HERE>
aws_secret_access_key=<YOUR_SECRET_KEY_HERE>
region=<AWS_REGION>

Make this file read-write to your user only:

sudo chmod 600 .awssecret

and export it to your environment

 export AWS_CONFIG_FILE=/home/<your_name>/.awssecret

then run in the terminal (this is a single line command, separated by \ for easy reading here):

aws s3 ls s3://<bucket_name>/foo/bar | \
grep -v -E "(Bucket: |Prefix: |LastWriteTime|^$|--)" | \
awk 'BEGIN {total=0}{total+=$3}END{print total/1024/1024" MB"}'

• the aws part lists the bucket (or optionally a 'sub-folder')
• the grep part removes (using -v) the lines that match the Regular Expression (using -E). ^$ is for blank line, -- is for the separator lines in the output of aws s3 ls
• the last awk simply add to total the 3rd colum of the resulting output (the size in KB) then display it at the end

NOTE this command works for the current bucket or 'folder', not recursively

Cloud watch also allows you to create metrics for your S3 bucket. It shows you metrics by the size and object count. Services> Management Tools> Cloud watch. Pick the region where your S3 bucket is and the size and object count metrics would be among those available metrics.