Support Policies for RHEL High Availability Clusters - Amazon Web Services (AWS) EC2 Instances as Cluster Members

Updated -



Applicable Environments

  • Red Hat Enterprise Linux (RHEL) with the High Availability Add-On
  • Using Amazon EC2 to provide instances that may serve as High Availability cluster members

Useful References and Guides


This guide offers Red Hat's policies, requirements, and limitations applicable to the use of Amazon Web Services (EC2) instances as members of a RHEL High Availability cluster. Users of RHEL High Availability software components should adhere to these policies by installing only on the approved platforms in order to be eligible to receive assistance from Red Hat Support with the appropriate support subscriptions.


Consider general conditions for support of RHEL High Availability in virtualization environments

Supported releases for Amazon AWS EC2 instances as High Availability members: Red Hat supports RHEL High Availability cluster members running on Amazon Web Services (AWS) EC2 instances with the following RHEL releases or later:

  • RHEL 7.4.z - Supported with packages resource-agents-3.9.5-105.el7_4.13, fence-agents-4.0.11-66.el7_4.6 and the most up to date 7.4.z corosync and pacemaker packages
  • RHEL 7.5 or later - Supported with packages pacemaker-1.1.18-11.el7, corosync-2.4.3-2.el7, fence-agents-*-4.0.11-86.el7 or later.

Amazon AWS EC2 instances cluster members have to be all in the same region: Red Hat does not support having cluster members in different AWS regions, all cluster members have to be in the same AWS region. We do support having cluster members running in different availability zones within the same region.

Supported transport protocols: RHEL 7 High Availability clusters with members that run on the Amazon EC2 platform can only use the udpu transport protocol - which is the default in RHEL 7 clusters. Azure VNETs do not support multicast traffic, preventing the usage of the udp transport protocol.

Red Hat only supports the knet transport in RHEL 8, regardless of platform.

For more information, see:

Shared storage: RHEL High Availability clusters support shared storage with LVM (including tagging, clvmd, etc) on the following versions of RHEL below.

  • RHEL 8.3 or later
  • RHEL 7.9

For more information, see:

Support for pacemaker managing Amazon Elastic File System (EFS). Support for managing Amazon Elastic File System (EFS) with pacemaker was added with the following releases below. For more information see: pacemaker cluster resources are unable to mount EFS with EFS Mount helper.

No support for AWS GovCloud VMs as RHEL High Availability cluster members: Red Hat does not support RHEL High Availability deployments consisting of members that are virtual machines running on the AWS GovCloud platform.

** Support for AWS Outposts VMs as RHEL High Availability cluster members**: Red Hat only supports RHEL High Availability deployments consisting of members that are virtual machines running on the AWS Outposts on-premises cloud platform on the following releases below:

  • RHEL 8.9 or later.
  • RHEL 9.3 or later.