What is Namespace?
Namespaces are a way to organize clusters into virtual sub-clusters they can be helpful when different teams or projects share a Kubernetes cluster. Any number of namespaces are supported within a cluster, each logically separated from others but with the ability to communicate with each other.
What are Services?
In Kubernetes, a service is an abstract way to expose an application running on a set of pods as a network service. It provides a stable IP address and DNS name, allowing other applications within or outside the cluster to access the pods seamlessly, even as pods come and go due to scaling, updates, or failures.
Services play a crucial role in abstracting the network connectivity and load-balancing aspects from the individual pods, making it easier to manage and scale applications. There are several types of services in Kubernetes:
ClusterIP: This is the default type. It exposes the service on a cluster-internal IP, making it accessible only from within the cluster. It's suitable for communication between different components of an application within the cluster.
NodePort: This type exposes the service on a static port on each node's IP. It allows external traffic to reach the service. It's often used for debugging or when you need to access a service from outside the cluster during development.
LoadBalancer: This type automatically creates an external load balancer that routes traffic to the service. It's useful when you need to expose a service externally, typically in cloud environments.
ExternalName: This type maps the service to the contents of the
externalNamefield (e.g., a CNAME record). It's used when you want to provide an external name to your service without actually exposing it within the cluster.Headless: This type allows you to disable the cluster IP and load balancing usually provided by a service. Instead, DNS records are created for the pods, making each pod directly addressable.
Ingress: Ingress is an API object that manages external access to services within a cluster. It provides HTTP and HTTPS routing to services based on the requested host and path.