Installer 10.5 | Complete Installation and Upgrade Information for Software AG Products | Upgrading Software AG Products On Premises | Critical Factors and Requirements for Successful Upgrade | Microservices Runtime Requirements | Clustering Requirements
 
Clustering Requirements
In Microservices Runtime, a cluster is defined as multiple Microservices Runtime instances that point to the same ISInternal database component and connect to the same Cache Manager on a Terracotta Server Array. In pre-10.4 installations, a cluster could include multiple Microservices Runtime installations as well as multiple server instances within a Microservices Runtime installation. Starting in 10.4, Microservices Runtime supports only one server instance, so a cluster can include multiple Microservices Runtime installations only.
This section is intended for use with the upgrade procedure for this product as explained elsewhere in this guide. You must perform all documented tasks for your products in the order they are written in that procedure, with the additional tasks or exceptions noted below.
*When you install the new Microservices Runtimes, install a Microservices Runtime for each old server instance you want to migrate. You can install the new Microservices Runtimes in parallel.
*When you install the fixes on the new Microservices Runtimes, you can install the fixes in parallel.
*When you shut down the old products, shut down all cluster nodes.
Configure the cluster as instructed in webMethods Integration Server Clustering Guide.