- Red Hat Enterprise Linux (RHEL) 6 or 7 with the High Availability Add-On
- Using Microsoft Azure to provide instances that may serve as High Availability cluster members
Recommended Prior Reading
Useful References and Guides
- Support Policies for RHEL High Availability Clusters
- Administrative Procedures - Installing and configuring a Red Hat Enterprise Linux 7.4 (and later)High Availability cluster on Microsoft Azure
This guide offers Red Hat's policies, requirements, and limitations applicable to the use of Microsoft Azure virtual machines 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 Microsoft Azure virtual machines as High Availability members: Red Hat supports RHEL High Availability cluster members running on Microsoft Azure virtual machines with the following RHEL releases or later:
- RHEL 7 Update 5 or later - Supported with packages
- RHEL 7 Update 4: Supported with packages
Supported transport protocols: RHEL High Availability clusters with members that run on the Microsoft Azure 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.
For more information, see:
- docs.microsoft.com - Azure Virtual Network FAQ
- Explore features - Overview of transport protocols
- Design guidance - Selecting the transport protocol
Known condition with slow fencing in Azure environments: Red Hat is aware of a condition which may cause fencing to take an excessive amount of time to complete in some Azure clusters. See Red Hat's Knowledge Solution describing this condition for more information, as well as Red Hat's guide to deploying a RHEL 7 High Availability cluster on Azure for instructions on accommodating this condition.
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