What is a Pod?
- Docker & Kubernetes course
- Intermediate
- Lesson 19/82
- 4 min
Learn that a Pod is the smallest Kubernetes unit.
What is a pod?
A pod is the smallest unit Kubernetes runs: a group of one or more containers running together on the same node. The containers in a pod share the same IP address and ports (they reach each other via localhost) and can mount volumes in common.
kubectl run deneme --image=nginx:1.27
kubectl get pod deneme -o wide
# NAME READY STATUS IP NODE
# deneme 1/1 Running 10.244.0.12 minikubePods are ephemeral
Pods aren't permanent: if the node crashes, or the pod is deleted or updated, a new pod is created with a new IP. That is why pods are usually created not directly but through controllers that manage them, like a Deployment; a Service gives pods a stable address.
kubectl run deneme --image=nginx:1.27 # a single pod for experiments
kubectl delete pod deneme # nobody recreates itPractice An experiment pod
Write three commands: run a pod named deneme with the nginx:1.27 image; show the pod in wide format; then delete it.
Starter code
# buraya yazSample solution
kubectl run deneme --image=nginx:1.27
kubectl get pod deneme -o wide
kubectl delete pod denemeExpected output
pod/deneme created NAME READY STATUS RESTARTS AGE IP NODE deneme 1/1 Running 0 6s 10.244.0.12 minikube pod "deneme" deleted
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 How do two containers in the same pod reach each other?
- With the host's IP
- They can't
- Via localhost and the port number Correct answer
- By pod name through DNS
Explanation: Since the network namespace is shared, both can't listen on the same port.
2 Run a single pod.
kubectl ____ deneme --image=nginx:1.27kubectl run deneme --image=nginx:1.27Explanation: kubectl run creates a single pod.
3 Match.
| Term | Meaning |
|---|---|
pod |
Smallest unit |
shared IP |
Access via localhost |
Deployment |
Manages pods |
Service |
Stable address |