pod

fun fact: the name pod comes from the saying pod of whales, and the entire k8s ecosystem is based on nautical terms. Even Kubernetes is a greek word which means a helmsman who orchestrates the ship, analogous to how k8s orchestrates pods!

things to know

• a pod is the smallest element in a k8s cluster
• a pod is not a container!
• a pod is a collection of containers + other resources!
• a pod can have:
  • single container
  • multi container
  • init container: an init container is a container that needs to run successfully for the pod to run. ex- an init container that checks whether a db connection is set (it can be used to do pre checks needed for a pod to run!)
  • Networking
  • Storage

Note: even though a pod is not a container but the most common pods are single container pods!

Pod related commands:

# runs a pod with a container haivng nginx image!
kubectl run nginx-aniket --image=nginx
 
# definition of the pod - containers, networking storage
kubectl describe pod nginx-aniket
 
# gets pods in the current namespace
kubectl get pods
 
# gets pods in all namespaces
kubectl get pods --all-namespaces

more on interacting with pods

Links:

interacting with pods kubernetes kubectl deployment

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