AWS EC2 Dedicated Host vs Dedicated Instances

EC2 Dedicated Host vs Dedicated Instances

EC2 Dedicated Host vs Dedicated Instances

  • Each instance launched into a VPC has a tenancy attribute.
    • default
      • is the default option
      • instances run on shared hardware.
      • all instances launched would be shared, unless you explicitly specify a different tenancy during the instance launch.
    • dedicated
      • instance runs on single-tenant hardware.
      • all instances launched would be dedicated
      • can’t be changed to default after creation
    • host
      • instance runs on a Dedicated Host, which is an isolated server with configurations that you can control.
  • default tenancy can’t be changed to dedicatedor hostand vice versa. Changes reflect the next time when the instance starts.
  • dedicatedtenancy can be changed to hostand vice versa only for the stopped instance after launch.
  • Dedicated Hosts and Dedicated Instances can both be used to launch EC2 instances onto physical servers that are dedicated for your use.
  • There are no performance, security, or physical differences between Dedicated Instances and instances on Dedicated Hosts.

Dedicated Host vs Dedicated Instances

EC2 Dedicated Host vs Dedicated Instances

Dedicated Hosts

  • EC2 Dedicated Host is a physical server with EC2 instance capacity fully dedicated to your use.
  • provides Affinity that allows you to specify which Dedicated Host an instance will run on after it has been stopped and restarted.
  • Dedicated Hosts provide visibility and the option to control how you place your instances on a specific, physical server. This enables you to deploy instances using configurations that help address corporate compliance and regulatory requirements.
  • Dedicated Hosts allow using existing per-socket, per-core, or per-VM software licenses, including Windows Server, Microsoft SQL Server, SUSE, and Linux Enterprise Server.
  • Dedicated Host is also integrated with AWS License Manager, a service that helps you manage your software licenses, including Microsoft Windows Server and Microsoft SQL Server licenses.
  • RDS instances are not supported.
  • Dedicated Hosts cannot be launched in placement groups

Dedicated Instances

  • Dedicated Instances are EC2 instances that run in a VPC on hardware that’s dedicated to a single customer
  • Dedicated Instances are physically isolated at the host hardware level from the instances that aren’t Dedicated Instances and from instances that belong to other AWS accounts.
  • Dedicated Instances can be launched using
    • Create the VPC with the instance tenancy set to dedicated, all instances launched into this VPC are Dedicated Instances even if you mark the tenancy as shared.
    • Create the VPC with the instance tenancy set to default, and specify dedicated tenancy for any instances that should be Dedicated Instances when launched.

AWS Certification Exam Practice Questions

  • Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
  • AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
  • AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
  • Open to further feedback, discussion and correction.
  1. A company wants its instances to run on single-tenant hardware with dedicated hardware for compliance reasons. Which value should they have to set the instance’s tenancy attribute to?
    1. Dedicated
    2. Isolated
    3. Default
    4. Reserved
  2. A company is performing migration from on-premises to AWS cloud. They have a compliance requirement for application hosting on physical servers to be able to use existing server-bound software licenses. Which AWS EC2 purchase type would help fulfill the requirement?
    1. Spot instances
    2. Reserved instances
    3. On-demand instances
    4. Dedicated Hosts