What is EC2 instance user data?

When you launch an instance in Amazon EC2, you have the option of passing user data to the instance that can be used to perform common automated configuration tasks and even run scripts after the instance starts. You can pass two types of user data to Amazon EC2: shell scripts and cloud-init directives.

How do I add user data to an existing EC2 instance?

Choose Actions, choose Instance Settings, and then choose Edit User Data. 6. Copy your user script into the Edit user data box, and then choose Save. The following example is a shell script that writes “Hello World” to a testfile.

How do I see EC2 instance usage?

To enable these reports, simply enable Detailed Billing Reports With Resources and Tags for your account. Then open up the Reports tab of the Billing Console. From there you can look at the EC2 Instance Usage Report and the EC2 Reserved Instance Utilization Report.

What is EC2 user in AWS?

Each Linux instance launches with a default Linux system user account. The default user name is determined by the AMI that was specified when you launched the instance. For Amazon Linux 2 or the Amazon Linux AMI, the user name is ec2-user . For a CentOS AMI, the user name is centos or ec2-user .

How do I find my EC2 metadata?

By default, you can use both instance metadata services. To require the use of IMDSv2, see Use IMDSv2. You can use a tool such as cURL, as shown in the following example. Note that you are not billed for HTTP requests used to retrieve instance metadata and user data.

What is the user data?

User data is typically local data that individuals need to complete their specific tasks. This data is to be kept in the /home file system or in file systems that are created specifically for user data.

Does user data run on reboot EC2?

When you update instance user data, user data scripts are not run automatically when you reboot or start the instance. However, you can enable user data execution so that user data scripts are run one time when you reboot or start the instance, or every time you reboot or start the instance.

What is AWS spot?

Amazon EC2 Spot Instances let you take advantage of unused EC2 capacity in the AWS cloud. Spot Instances are available at up to a 90% discount compared to On-Demand prices. Due to the operating scale of AWS, Spot Instances can offer the scale and cost savings to run hyper-scale workloads.

How do I find my EC2 instance size?

Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/ .

  1. In the navigation pane, choose Instances.
  2. Select the instance.
  3. In the Storage tab, view the information provided about root and block devices.
  4. (Optional) Choose a link in the Volume ID column to view additional details for the volume.

What is EC2 and how it works?

Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides secure, resizable compute capacity in the cloud. It is designed to make web-scale cloud computing easier for developers. It provides you with complete control of your computing resources and lets you run on Amazon’s proven computing environment.