When I terminated an EC2 instance, I thought the EC2 instance would be terminated after additional EBS Volume (not root volume) was detached.

However, even if I look up Cloudtrail, I couldn't find the event named DetachVolume.

When I terminate an EC2 instance, does EBS do something like disconnection without being detached?

What's happening with EBS Volume when an EC2 instance is terminated?

CodePudding user response：

When an AWS EC2 instance is terminated, the AWS EBS volume attached to it either gets detached and deleted or just gets detached and doesn't get deleted. That depends on the value of the attribute named Delete on termination of the attached AWS EBS volume. You can see this on the AWS EC2 console by selecting the AWS EC2 instance and then navigating to the storage tab.

By default, its value is True for the root volume and False for the other volumes.

You can modify this value using AWS CLI only. From the AWS EC2 console, you can set its value when launching a new instance only. For already running AWS EC2 instance, use AWS CLI.

Examples using AWS CLI are below:

• Using a .json file: aws ec2 modify-instance-attribute --instance-id i-a3ef245 --block-device-mappings /path/to/file.json

  • .json file format:

  [
    {
    "DeviceName": "/dev/sda1",
    "Ebs": {
      "DeleteOnTermination": false
      }
    }
  ]
  

• Using a .json object inline: aws ec2 modify-instance-attribute --instance-id i-a3ef245 --block-device-mappings "[{\"DeviceName\": \"/dev/sda\",\"Ebs\":{\"DeleteOnTermination\":false}}]"

For more information, check this out: How can I prevent my Amazon EBS volumes from being deleted when I terminate Amazon EC2 instances?

CodePudding user response：

When an instance terminates, the value of the DeleteOnTermination attribute for each attached EBS volume determines whether to preserve or delete the volume. By default, the DeleteOnTermination attribute is set to True for the root volume, and is set to False for all other volume types.

1. Delete on termination - false Volume ID Device name Size Status Encrypt KMS ID Delete on Termination vol-09*** /dev/xvda 8 Attached No – Yes

   vol-03** /dev/sdb 8 Attached No – No

Status after termination of instance : Available

2. Delete on Termination - True

   Volume ID Device name Size Status Encrypt KMS ID Delete on Termination

   vol-09*** /dev/xvda 8 Attached No – Yes

   vol-03** /dev/sdb 8 Attached No – Yes

Status of EBS vol. apart from Root volume after termination of instance : deleted