Pod-to-Pod communication in Kubernetes - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Pod-to-Pod communication in Kubernetes?

It is the ability of one Pod to send network traffic directly to another Pod within the same Kubernetes cluster.

beginner

How do Pods communicate with each other by default in Kubernetes?

By default, all Pods in a Kubernetes cluster can communicate with each other using their IP addresses without any extra configuration.

intermediate

What role does the Kubernetes Service play in Pod-to-Pod communication?

A Service provides a stable IP and DNS name to a set of Pods, enabling reliable communication even if Pods change or restart.

intermediate

What is a NetworkPolicy in Kubernetes?

A NetworkPolicy is a set of rules that control how Pods are allowed to communicate with each other and other network endpoints.

advanced

Why might Pod-to-Pod communication fail even though Pods are running?

Possible reasons include NetworkPolicy restrictions, misconfigured network plugins, or firewall rules blocking traffic.

What is the default behavior of Pod-to-Pod communication in Kubernetes?

A All Pods can communicate with each other by default

B Pods cannot communicate unless a Service is created

C Pods communicate only within the same Node

D Pods require manual IP configuration to communicate

By default, Kubernetes allows all Pods to communicate with each other across the cluster using their IP addresses.

Which Kubernetes object provides a stable IP address for a group of Pods?

A Service

B Pod

C NetworkPolicy

D ConfigMap

A Service gives a stable IP and DNS name to a set of Pods, making communication reliable.

What does a NetworkPolicy control in Kubernetes?

A Pod scheduling

B Network traffic between Pods

C Pod resource limits

D Pod storage volumes

NetworkPolicy defines rules for allowed network traffic between Pods and other endpoints.

If Pod-to-Pod communication is blocked, what is a common cause?

A Pods have different labels

B Pods are on different Nodes

C NetworkPolicy is restricting traffic

D Pods are in different namespaces

NetworkPolicy can block traffic between Pods if rules are restrictive.

How do Pods identify each other for communication?

A Using hostnames only

B Using external DNS names

C Using MAC addresses

D Using IP addresses assigned by Kubernetes

Pods use their assigned IP addresses within the cluster to communicate.

Explain how Pod-to-Pod communication works in Kubernetes and the role of Services.

Think about how Pods find each other and stay connected even if they restart.

Describe what a NetworkPolicy is and how it affects Pod-to-Pod communication.

Consider how you might restrict who can talk to whom inside the cluster.