# Delete unused EBS Volumes

## What It Does

Deletes unused EBS volumes that are no longer attached to any EC2 instance. Unused volumes continue to incur storage costs even when idle. This runbook removes orphaned volumes after creating a snapshot for backup, helping reduce storage waste and control spend.

## Risk and Scope

| Detail                   | Value                     |
| ------------------------ | ------------------------- |
| **Risk Level**           | Medium                    |
| **AWS Service Targeted** | Elastic Block Store (EBS) |

{% hint style="warning" %}

## Permissions Required

Delete Permissions

* `ec2:DeleteVolume`

**Write Permissions**

* `ec2:CreateSnapshot`

**Read Permissions**

* `ec2:DescribeVolumes`

> These permissions are granted **only to the runbook**, not to the OneLens platform itself.
> {% endhint %}

## Optimization Policies Addressed

This runbook remediates violation tickets of the following policy:

| Policy ID | Policy Name                                                              |
| --------- | ------------------------------------------------------------------------ |
| ebs\_2    | EBS volumes should not be unattached                                     |
| ebs\_11   | EBS volumes should not be attached to stopped instances for long periods |

## Risk Mitigation

{% hint style="success" %}

## Risk Mitigation Strategy

* **Snapshots are** **taken** before the change to prevent any data loss.
* The volume can be **re-created** from that snapshot if needed.
  {% endhint %}

## How to Install

Refer to the [Runbook Setup Guide ](/automate/remediations/runbooks/install-runbooks.md#installing-a-runbook)for steps to install and enable this runbook in your environment.

## Runbook Workflow

### Step 1: Start

**Trigger:** Initiates the workflow to identify and delete orphaned EBS volumes.

### Step 2: validateEBS

**Action:**Runs a validation script to identify whether the EBS volume is unused and safe to delete.

### Step 3: If/Else

**Condition:** Checks whether the volume qualifies for deletion.

1. **If eligible, proceeds with deletion workflow:** 
   1. **CreateSnapshot**\
      Creates a snapshot of the EBS volume to retain a backup.
   2. **WaitForSnapshotCompletion**\
      Ensures snapshot creation is complete by describing snapshot status.
   3. **DeleteVolume**\
      Deletes the EBS volume to eliminate unnecessary storage cost.
2. **Else:**

   Ends the workflow if no deletable volume is identified.

## See How It Works

<figure><img src="/files/kWm3MGdllrFfvYtdpshR" alt=""><figcaption></figcaption></figure>

## Triggering the Runbook

To run this workflow:

### **1. Locate the Ticket**

Identify the ticket associated with the above mentioned policy violation.

### **2. Execute the Runbook**

Follow the steps described in the [executing a runbook](/automate/remediations/runbooks.md#executing-a-runbook) section to apply this runbook to the ticket.


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