High Availability Add-On

Red Hat^® Enterprise Linux^® provides the ability to create managed, highly available clusters with groups of RHEL servers. This Add-On can be configured to manage most applications (both off-the-shelf and custom) and provides a wide range of configuration options to fit most requirements. This Add-On includes:

• The Pacemaker cluster resource manager supports up to 32 (x86) nodes.
• Corosync and Kronosnet for managing network communication between cluster nodes.
• Booth and QDevice/QNetd for managing multisite and stretch clusters.
• A Pacemaker command line interface (pcs) and GUI (pcsd).
• A collection of resource agents for many commonly used applications as well as support for user-created resource agents, management of systemd services, and containers.
• A collection of fencing agents for use on bare metal servers, virtual machines, and cloud platforms.
• For IBM POWER and/or Z, please contact your sales representative.

Red Hat^® Enterprise Linux^® targets general-purpose clustering workloads. Its capabilities include support for a wide variety of application configurations, including active/passive, active/active & primary/secondary. The clustering software maintains high availability by automatically restarting and/or moving failing services (and their dependencies) to other functioning nodes.

Some well-known applications that run well with RHEL High Availability include SAP, Apache, PostgreSQL, and DB2. In addition, most custom applications can be managed by RHEL High Availability by using their systemd startup script or by writing a simple custom resource agent.

See also: Datasheet, Deployment Guides: RHEL8, RHEL9