With the release of Red Hat Decision Manager 7.3, I’ve started updating my free online workshop, a beginners guide to building an online retail web shop.
The previous article covered installing the tooling and setting up a project. This update is the for the third lab in this workshop, with more to follow. Learn how to create a domain model with Red Hat Decision Manager.
The Istio traffic management model basically allows for the decoupling of traffic from infrastructure scaling, allowing operations personnel to specify the rules to apply to traffic using Pilot instead of specifying which pods/VMS should receive traffic. Decoupling traffic from infrastructure scaling allows Istio to provide a variety of traffic management functions independent of application code. The Envoy sidecar proxy implements these functions.
In a typical mesh, you often have one or more finalizing external TLS connections at the end to guide traffic into the mesh’s load balancer (known as a gateway); the traffic then flows through internal services after the sidecar gateway. The following figure illustrates the use of gateways in a mesh:
Logic programming is a programming paradigm that sees computation as automatic reasoning over a database of knowledge made of facts and rules. It is a way of programming and is based on formal logic. A program in such a language is a set of sentences, in logical form, one that expresses facts and rules about a problem domain. Among others, Datalog is one such major logic programming language family.
Let’s talk about facts and rules. Facts are true statements — say, Bucharest is the capital of Romania. Rules are constraints that lead us to conclusions about the problem domain. These are logical clauses that express facts. We use the following syntax to write a rule (as a clause):
