19-Practice-Test-Namespaces.md

Practice Test - Namespaces

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Solutions to practice test for namespaces

1. How many Namespaces exist on the system?

   kubectl get namespace
   

   Count the number of namespaces (if any)

2. How many pods exist in the research namespace?

   kubectl get pods --namespace=research
   

   Count the number of pods (if any)

3. Create a POD in the finance namespace.

   kubectl run redis --image=redis --namespace=finance
   

4. Which namespace has the blue pod in it?

   kubectl get pods --all-namespaces
   

   Examine the output.

   Or use grep to filter the results, knowing that NAMESPACE is the first result column

   kubectl get pods --all-namespaces | grep blue
   

5. Access the Blue web application using the link above your terminal!!

   Press the blue-application-ui button at the top of the terminal. Try the following:

   Host Name: db-service
   Host Port: 6379
   

6. What DNS name should the Blue application use to access the database db-service in its own namespace - marketing?

   db-service

   To access services in the same namespace, only the host name part of the fully qualified domain name (FQDN) is required.

7. What DNS name should the Blue application use to access the database db-service in the dev namespace?

   Either FQDN

   db-service.dev.svc.cluster.local

   Or, it is sufficient just to append the namespace name

   db-service.dev