Encrypt EBS volumes from AWS EC2 instances

A serverless version of this script exists here: https://github.com/jbrt/ec2cryptomatic-serverless

This tool let you :

• Encrypt all the EBS volumes for an instance
• If volumes already encrypted, re-encrypt these with the given key
• Duplicate all the source tags to the target
• Apply DeleteOnTermination flag if needs
• Preserve the original volume or not as an option (thank to @cobaltjacket)
• Start each instance after encrypting is complete (thank to @dshah22)

For your information, the workflow used to encrypt an EBS volume is:

• Take a snapshot from the original volume
• Create a new volume encrypted from that snapshot
• Swap volumes
• Delete source unencrypted volumes (if requested)

Since version 1, EC2Cryptomatic was coded in Python. This version 2 is a complete rewriting of this tool in Golang.

Why Golang instead of Python ? Principally because of fun and for training for the author on that language.

Golang is also a good option for a CLI tool like this (more portable than Python).

Python version is still available at git tag 1.2.4.

EC2Cryptomatic needs the following IAM rights:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "EC2CryptomaticPolicy",
            "Action": [
                "ec2:AttachVolume",
                "ec2:CopyImage",
                "ec2:CopySnapshot",
                "ec2:CreateSnapshot",
                "ec2:CreateVolume",
                "ec2:CreateTags",
                "ec2:DeleteSnapshot",
                "ec2:DeleteVolume",
                "ec2:DescribeInstances",
                "ec2:DescribeSnapshots",
                "ec2:DescribeVolumes",
                "ec2:DetachVolume",
                "ec2:ModifyInstanceAttribute",
                "ec2:StartInstances",
                "kms:DescribeKey"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ]
}

Here is the syntax of ec2cryptomatic. You have to specify a AWS region name and one EC2 instance ID.

Encrypt all EBS volumes for the given instances

Usage:
  ec2cryptomatic run [flags]

Flags:
  -d, --discard           Discard source volumes after encryption process (default: false)
  -h, --help              help for run
  -i, --instance string   Instance ID of instance of encrypt (required)
  -k, --kmskey string     KMS key alias name (default "alias/aws/ebs")
  -r, --region string     AWS region (required)

You can build a Docker image of that tool with the Dockerfile provided in this repository :

docker build -t ec2cryptomatic:latest .

Or you can use the image already pulled into the official Docker Hub:

docker pull jbrt/ec2cryptomatic

If you do not want to use Docker, you can use a binary version (accessible from the release section). Versions currently supported:

• Linux (x86_64, ARM)
• FreeBSD (x86_64, ARM)
• MacOS/Darwin (x86_64 only)
• Windows (x86_64 only)

This project is under GPL3 license