Pod is a single instance of an application.

kubectl run nginx --image nginx

Resume:

• Kubernetes Pod Basics:
  • Kubernetes does not deploy containers directly; instead, it encapsulates them into "pods."
  • A pod is the smallest Kubernetes object and represents a single instance of an application, typically containing one container.
• Scaling Applications:
  • To handle increased load, add new pods (not containers within an existing pod).
  • Scaling across nodes in a cluster is supported by deploying additional pods on new nodes if capacity on current nodes is insufficient.
• Multi-Container Pods:
  • Although a pod usually has one container, it can contain multiple containers.
  • Multi-container pods are rare and typically used for helper tasks, where containers need to share resources or communicate directly.
• Kubernetes Pod vs. Docker:
  • In Docker, manually managing connections, storage, and scaling is necessary. Kubernetes automates this within pods.
  • Pods share network and storage, creating and destroying containers in sync.
• kubectl Commands for Pods:
  • Creating a pod: kubectl run command, with the -image parameter specifying the Docker image (e.g., NGINX from Docker Hub).
  • Listing pods: kubectl get pods shows all pods and their states (e.g., running or creating).
• External Access:
  • Pods are initially inaccessible to external users. Later lectures cover exposing pods to external users through networking and services.