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

Updated -

Contents

Overview

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

Introduction

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.

Policies

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

  • RHEL 8.3 or later
  • RHEL 7.9

RHEL HA is supported on AWS GovCloud, with the caveat that because Amazon EBS Multi-Attach is not available in GovCloud, the Resilient Storage Add-On is not supported. For more information see: Support Policies for RHEL Resilient Storage Clusters - Resilient Storage on Amazon Web Services (AWS) EC2 Instances. AWS GovCloud does not support shared block storage which means using pacemaker resources that use shared block storage is not supported (ex. LVM-activate, Filesystem, etc).

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.

Support for AWS GovCloud 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 GovCloud platform on the following releases below:

  • RHEL 8.6 or later
  • RHEL 9.2 or later

RHEL HA is supported on AWS GovCloud, with the caveat that because Amazon EBS Multi-Attach is not available in GovCloud, the Resilient Storage Add-On is not supported. For more information see: Support Policies for RHEL Resilient Storage Clusters - Resilient Storage on Amazon Web Services (AWS) EC2 Instances. AWS GovCloud does not support shared block storage which means using pacemaker resources that use shared block storage is not supported (ex. LVM-activate, Filesystem, etc).

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 8.4 or later.
  • RHEL 9.4 or later.

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