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Networking in Kubernetes


  • Pods that are running inside Kubernetes are running on a private, isolated network. By default they are visible from other pods and services within the same Kubernetes cluster, but not outside that network
  • Every Pod has a unique IP address
    • And it is reachable from all other Pods in the K8s cluster
    • A pod is a host, just like your laptop, having an ip-address and a range of ports that can be alloted to containers
    • A container runs on a specific port inside a pod
  • In a Kubernetes environment, when services are deployed within the same namespace, they can communicate with each other using the service name as the hostname
    • e.g. in the following snippet from appsetting.json form a .net core project, 'document-api' is the name of the service
    • "DocumentApiConfiguration": { "BaseUrl": "http://document-api/" }
  • What if I want to access a service from another namespace?
    • When you want to access a service from another namespace in Kubernetes, you typically need to use the fully qualified domain name (FQDN) of the service, which includes the namespace. The format is <service-name>.<namespace>.svc.cluster.local






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