Commands and Namespaces

Lab Objectives

This lab has you run a few different commands to familiarize yourself with kubectl.

Lab Structure - Overview

1. List Kubernetes Pods and Nodes
2. List Kubernetes Services and Namespaces
3. Look at Kubernetes components

Execute on the Leader node

The following commands should all be executed in the VS Code window connected to the leader node.

List Pods and Nodes

1. Enter the following to list Pods in the default namespace

   kubectl get pods 
   

   NOTE: This will return ‘no resources found’

2. List Pods in all namespaces.

   kubectl get pods --all-namespaces
   

3. List nodes

   kubectl get nodes 
   

4. List nodes and additional information (labels, name, IP etc.)

   kubectl get nodes -o wide 
   

List Services and Namespaces

1. List Services in default namespace

   kubectl get services
   

2. List Services in all namespaces.

   kubectl get services --all-namespaces
   

   PROTIP: substitute svc for services

3. List Namespaces

   kubectl get namespaces
   

4. Create a new Namespace.. Use kubectl create --help if you get stuck.

Explore Kubernetes

Using kubectl interact with the Kubernetes cluster.

1. Look at documentation

   kubectl --help
   

2. Retrieve information about Kubernetes resources

   kubectl get <random resources>
   

3. Look at node details

   kubectl describe node <node from cluster>
   

4. Look at Pod details

   kubectl describe pod -n kube-system coredns
   

5. Check out service details

   kubectl describe svc kubernetes
   

6. Look at deployment details

   kubectl describe deployment -n kube-system coredns 
   

Now you should have a better understanding of Kubernetes resources and using the kubectl client.