AWS EC2

Instance type

On-Demand

With On-Demand instances, you pay for compute capacity by the hour or the second depending on which instances you run. No longer-term commitments or upfront payments are needed. You can increase or decrease your compute capacity depending on the demands of your application and only pay the specified per hourly rates for the instance you use.

Spot instances

Amazon EC2 Spot instances allow you to request spare Amazon EC2 computing capacity for up to 90% off the On-Demand price. Learn More.

Amazon EC2 Pricing - Amazon Web ServicesAmazon Web Services, Inc.

Amazon EC2 Instance Types - Amazon Web ServicesAmazon Web Services, Inc.

CPU Credits and Baseline Performance for Burstable Performance Instances

Key concepts and definitions for burstable performance instances - Amazon Elastic Compute CloudAmazon Elastic Compute Cloud

Amazon EC2 Pricing (on-demand)

EC2 On-Demand Instance Pricing – Amazon Web ServicesAmazon Web Services, Inc.

When to Use Spot Instances

When to Use Spot Instances - Overview of Amazon EC2 Spot InstancesOverview of Amazon EC2 Spot Instances

check available instance type of region via AWS CLI

aws2 ec2 describe-instance-type-offerings --location-type availability-zone --region us-east-2

AWS Pricing Calculator

ssh user name

• 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.

• For a Debian AMI, the user name is admin.

• For a Fedora AMI, the user name is fedora or ec2-user.

• For a RHEL AMI, the user name is ec2-user or root.

• For a SUSE AMI, the user name is ec2-user or root.

• For an Ubuntu AMI, the user name is ubuntu.

• For an Oracle AMI, the user name is ec2-user.

• For a Bitnami AMI, the user name is bitnami.

• Otherwise, check with the AMI provider.

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/connection-prereqs.html#connection-prereqs-get-info-about-instance