Contents
What is a stateful Deployment?
Stateful applications save data to persistent disk storage for use by the server, by clients, and by other applications. An example of a stateful application is a database or key-value store to which data is saved and retrieved by other applications.
What is difference between stateful and Deployment?
A StatefulSet is another Kubernetes controller that manages pods just like Deployments. But it differs from a Deployment in that it is more suited for stateful apps. A stateful application requires pods with a unique identity (for example, hostname). One pod should be able to reach other pods with well-defined names.
What is stateful service in Kubernetes?
StatefulSet is the workload API object used to manage stateful applications. Manages the deployment and scaling of a set of Pods, and provides guarantees about the ordering and uniqueness of these Pods. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec.
How do you expose a stateful set?
You can create individual Services for each instance that use that label as their selector to expose the individual instances of the StatefulSet. To remove a potential extra hop, create the Services with the attribute externalTrafficPolicy and set it to Local .
What is the difference between daemon set and Deployment?
You will have to specify the tolerations for it on the pod. which means that it should tolerate all nodes. When you deploy the daemonset, it will create pods equal to the number of nodes. In terms of behavior, it will behave the same as Deployments i.e. all pods will share the same Persistent Volume.
Why is headless service used?
What exactly is a headless service. It is used for discovering individual pods(especially IPs) which allows another service to interact directly with the Pods instead of a proxy.
How does a stateful and stateless application work?
Stateful and Stateless applications store state from client requests on the server itself and use that state to process further requests. It uses DB for storing data as a backend, but session information stored on the server itself.
How are reliable collections used in stateful services?
For stateful services, the Reliable Services programming model allows you to consistently and reliably store your state right inside your service by using Reliable Collections. Reliable Collections are a simple set of highly available and reliable collection classes that will be familiar to anyone who has used C#…
How does a front-end service talk to a stateless service?
The front-end service then talks to stateful services to complete a user request. In this case, calls from clients are directed to a known port, such as 80, where the stateless service is listening.
How are stateless services used in service fabric?
A common example of how stateless services are used in Service Fabric is as a front-end that exposes the public-facing API for a web application. The front-end service then talks to stateful services to complete a user request. In this case, calls from clients are directed to a known port, such as 80, where the stateless service is listening.