creating-and-managing-pods.md

Creating and managing pods

At the core of Kubernetes is the Pod. Pods represent a logical application and hold a collection of one or more containers and volumes. In this lab you will learn how to:

• Write a Pod configuration file
• Create and inspect Pods
• Interact with Pods remotely using kubectl

In this lab you will create a Pod named monolith and interact with it using the kubectl command line tool.

Tutorial: Creating Pods

Explore the monolith pod configuration file:

cat pods/monolith.yaml

Create the monolith pod using kubectl:

kubectl create -f pods/monolith.yaml

Exercise: View Pod details

Use the kubectl get and kubect describe commands to view details for the monolith Pod:

Hints

kubectl get pods

kubectl describe pods <pod-name>

Quiz

• What is the IP address of the monolith Pod?
• What node is the monolith Pod running on?
• What containers are running in the monolith Pod?
• What are the labels attached to the monolith Pod?
• What arguments are set on the monolith container?

Exercise: Interact with a Pod remotely

Pods are allocated a private IP address by default and cannot be reached outside of the cluster. Use the kubectl port-forward command to map a local port to a port inside the monolith pod.

Hints

Use two terminals. One to run the kubectl port-forward command, and the other to issue curl commands.

kubectl port-forward monolith 10080:80

curl http://127.0.0.1:10080

curl http://127.0.0.1:10080/secure

curl -u user http://127.0.0.1:10080/login

Type "password" at the prompt.

curl -H "Authorization: Bearer <token>" http://127.0.0.1:10080/secure

Use the JWT token from the previous login.

Exercise: View the logs of a Pod

Use the kubectl logs command to view the logs for the monolith Pod:

kubectl logs monolith

Use the -f flag and observe what happens.

Exercise: Run an interactive shell inside a Pod

Use the kubectl exec command to run an interactive shell inside the monolith Pod:

kubectl exec monolith --stdin --tty -c monolith /bin/sh