Selecting the target HA architecture for IBM MQ running in containers
Choose between single instance (a single Kubernetes Pod) and multi-instance (two Pods) to meet your high availability requirements.
Before you begin
About this task
The IBM® MQ Advanced certified container provides two high availability options:
- Single instance: A single container (Pod) is started and it is the responsibility of OpenShift® to restart in the event of a failure. Because of the characteristics of a stateful set within Kubernetes, there are several situations in which this failover might take an extended period of time, or require an administrative action to be completed.
- Multi-instance: Two containers (each in a separate Pod) are started, one in active mode and another on standby. This topology enables much faster failover. It requires a Read Write Many file system that meets IBM MQ requirements.
In this task you only choose the target HA architecture. Steps for configuring your chosen architecture are described in a subsequent task in this scenario (Creating the new queue manager on Red Hat OpenShift).