Solution Namespaces optional

This lesson walks through the solution for the namespaces lab. It shows how to list namespaces, count pods in a namespace, and create a Pod in a specific namespace. Use the commands and examples below to verify resources in your cluster. Quick answers

Question	Short answer
How many namespaces exist on the system?	`10`
How many pods exist in the `research` namespace?	`2` (`dna-1`, `dna-2`)
How to create a Pod named `redis` in the `finance` namespace?	`kubectl run redis --image=redis --restart=Never -n finance`

Question 1 — How many namespaces exist on the system?

List all namespaces with:

kubectl get namespaces
# short form:
kubectl get ns

Example output:

controlplane ~ ➜  kubectl get namespaces
NAME               STATUS   AGE
default            Active   6m50s
kube-system        Active   6m49s
kube-public        Active   6m49s
kube-node-lease    Active   6m49s
finance            Active   27s
marketing          Active   27s
dev                Active   27s
prod               Active   27s
manufacturing      Active   27s
research           Active   27s

Count the lines (excluding the header) — there are 10 namespaces in this example. For more on namespaces and how they partition cluster resources, see the Kubernetes docs: Namespaces.

Question 2 — How many pods exist in the research namespace?

To list pods in a specific namespace, use --namespace or the short -n flag:

kubectl get pods --namespace=research
# or
kubectl get pods -n research

Example output for the research namespace:

controlplane ~ ➜ kubectl get pods -n research
NAME   READY   STATUS             RESTARTS        AGE
dna-2  0/1     CrashLoopBackOff   3 (14s ago)     76s
dna-1  0/1     CrashLoopBackOff   3 (16s ago)     76s

There are 2 pods in the research namespace: dna-1 and dna-2. Tip: use kubectl describe pod <pod-name> -n research and kubectl logs <pod-name> -n research to investigate CrashLoopBackOff or other pod issues.

Question 3 — Create a pod in the finance namespace using the given spec

To create a single Pod named redis from the redis image in the finance namespace, you can use kubectl run. Newer kubectl versions default to creating a Deployment unless you explicitly request a Pod object by setting --restart=Never:

kubectl run redis --image=redis --restart=Never -n finance

Then verify the Pod exists:

kubectl get pods -n finance

kubectl run behavior changed in newer versions: without --restart=Never it may create a Deployment instead of a Pod. Use --restart=Never to ensure a Pod is created, or provide a Pod manifest and apply it with kubectl apply -f <pod-manifest.yaml>.

Additional verification examples

Below are example commands to show how to inspect resources in other namespaces. These help illustrate how Services and Pods appear when scoped to a namespace. Example: list pods in the marketing namespace

controlplane ~ ➜  kubectl get pods -n marketing
NAME             READY   STATUS    RESTARTS   AGE
redis-db         1/1     Running   0          4m14s
blue             1/1     Running   0          4m14s

Example: list services in the marketing namespace

controlplane ~ ➜  kubectl get svc -n marketing
NAME           TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)           AGE
blue-service   NodePort   10.43.82.162    <none>        8080:30082/TCP    4m27s
db-service     NodePort   10.43.134.33    <none>        6379:30758/TCP    4m27s

Example: list services in the dev namespace

controlplane ~ ➜  kubectl get svc -n dev
NAME        TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
db-service  ClusterIP   10.43.252.9     <none>        6379/TCP   5m22s

Use these commands to verify and debug resources across namespaces. For quick reference, see:

kubectl basics: https://kubernetes.io/docs/reference/kubectl/overview/
kubectl run docs: https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#run

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Mock Exams

Solution Namespaces optional

Question 1 — How many namespaces exist on the system?

Question 2 — How many pods exist in the research namespace?

Question 3 — Create a pod in the finance namespace using the given spec

Additional verification examples

Watch Video

​Question 1 — How many namespaces exist on the system?

​Question 2 — How many pods exist in the research namespace?

​Question 3 — Create a pod in the finance namespace using the given spec

​Additional verification examples

Watch Video

Question 1 — How many namespaces exist on the system?

Question 2 — How many pods exist in the research namespace?

Question 3 — Create a pod in the finance namespace using the given spec

Additional verification examples