Concepts

Is a logical grouping of Workloads defined by the application labels that users apply to an object. In Istio it is defined by the Label App. Istio Label Requirements.

A deployment is a replication controller based on a user defined template called a Deployment configuration. Deployments are created manually or in response to triggered events.

For more information see the Istio Sidecar definition in Istio Sidecar Documentation.

It’s a user-created tag to identify a set of objects.

An empty label selector (that is, one with zero requirements) selects every object in the collection.

A null label selector (which is only possible for optional selector fields) selects no objects.

For example, Istio uses the Label App & Label Version on a Workload to specify the version and the application.

Namespaces are intended for use in environments with many users spread across multiple teams, or projects.

Namespaces are a way to divide cluster resources between multiple users.

A limited or fixed number or amount of resources.

Ensures that a specified number of pod replicas are running at any one time.

A Service is an abstraction which defines a logical set of Pods and a policy by which to access them. A Service is determined by a Label.

For more information see the VirtualService definition in Istio VirtualService Documentation.

For more information see the Workload definition in Istio Glossary.