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AWS for Beginners: What is AWS VPC Peering and Why Transit Gateway is Required? Part 24
AWS EC2 Hibernate is a feature of Amazon Web Services (AWS) Elastic Compute Cloud (EC2) that allows users to “hibernate” their EC2 instances instead of stopping or terminating them. When an EC2 instance is hibernated, the current state of the instance’s memory and all the contents of the instance’s disks are written to an encrypted storage location in Amazon S3. When the user resumes the instance, the instance is restored to its previous state, including its RAM contents, which allows the user to resume from where they left off, without the need to restart any applications or reload data.
Note that not all EC2 instances support hibernation, and there may be additional costs associated with using this feature, such as S3 storage costs. Additionally, hibernation may take longer to start and stop an instance than other options, such as stopping an instance.
1. Login to AWS console and navigate to the EC2 instance page.
2. Kindly note that not all the EC2 instances support hibernate feature. To identify hibernate supported EC2 instances, use the AWS CLI and run the following command.
output text | sort
c4.2xlarge
c4.4xlarge
c4.8xlarge
c4.large
c4.xlarge
c5.12xlarge
c5.18xlarge
c5.2xlarge
c5.4xlarge
c5.9xlarge
and so on..
3. Hibernate feature can’t be enabled once the instance is launched. You need to enable this feature while launching the instance.
4. You can find the “hibernate behavior” option in the advanced EC2 options section.
5. You must enable “disk encryption” to use the “hibernate” feature. This ensures that In-memory content is protected securely.
6. Here we can see that instance is launched successfully.
7. Before “Hibernate” instance, let’s run some job to append numbers automatically for every 10 seconds. This job will resume once you bring instance back to running from hibernate state.
Login to EC2 instance.
The authenticity of host ‘3.19.72.220 (3.19.72.220)’ can’t be established.
ED25519 key fingerprint is SHA256:uq0VyWL7TjGncbCbvxulJLjSaGBSuhFHtSQ3QDUS5KQ.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added ‘3.19.72.220’ (ED25519) to the list of known hosts.
__| __|_ )
_| ( / Amazon Linux 2 AMI
___|\___|___|
https://aws.amazon.com/amazon-linux-2/
[ec2-user@ip-172-31-32-136 ~]$
8. Create a script called “counter.sh” like below and make it executable.
#!/bin/bash
total=”${1}”
for ((i = 0; i < total; ++i)); do echo "${i}" sleep 10 done [ec2-user@ip-172-31-32-136 ~]$ chmod +x counter.sh [ec2-user@ip-172-31-32-136 ~]$
9. Execute the script in the background and add nohup. This job will be keep on appending numbers sequentially up to 1000.
[1] 2608
[ec2-user@ip-172-31-32-136 ~]$ nohup: ignoring input and appending output to ‘nohup.out’
[ec2-user@ip-172-31-32-136 ~]$ cat nohup.out
0
[ec2-user@ip-172-31-32-136 ~]$ cat nohup.out
0
1
[ec2-user@ip-172-31-32-136 ~]$
10. To hibernate the instance, click on “Instance state” and click on “Hibernate instance”
11. Once the instance hibernated successfully, we can see that instance will be in “stopped state”
12. Start the instance from the portal.
13. Login to the EC2 instance. Instance might come up with new IP address.
The authenticity of host ‘18.223.112.214 (18.223.112.214)’ can’t be established.
ED25519 key fingerprint is SHA256:uq0VyWL7TjGncbCbvxulJLjSaGBSuhFHtSQ3QDUS5KQ.
This host key is known by the following other names/addresses:
~/.ssh/known_hosts:27: 3.19.72.220
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added ‘18.223.112.214’ (ED25519) to the list of known hosts.
Last login: Sat Feb 18 16:15:02 2023 from 49.207.202.238
__| __|_ )
_| ( / Amazon Linux 2 AMI
___|\___|___|
https://aws.amazon.com/amazon-linux-2/
[ec2-user@ip-172-31-32-136 ~]$ cat nohup.out
0
1
2
3
4
5
6
7
8
9
10
Here we can see that the script has started running and appending numbers in nohup.out file.
Conclusion:
The hibernation feature is particularly useful for instances that have long initialization times or instances that require a lot of configuration and customization. By using hibernation, the user can avoid the overhead of starting up the instance and configuring it every time they need to use it.
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