2. Pods.md

Pods

A Pod represents a set of running containers on your cluster - it's the smallest and simplest Kubernetes object.

Using Command Line

1. Create new Pod called 'webserver' running nginx image using command line

   kubectl run webserver --image=nginx --restart=Never 
   

2. Get the status, IP of the pod 'webserver'

   kubectl get pod webserver -o wide 
   

   Now use describe to get detailed description of the pod , including related resources such as events or controllers

   kubectl describe pod webserver  
   

3. Delete pod 'webserver'

   kubectl delete pod webserver
   

4. List all the pods in current namespace

   kubectl get pod 
   

5. Create new Pod called 'faultywebserver' running nnginx image using command line

   kubectl run faultywebserver --image=nnginx --restart=Never 
   

6. Get the status, IP of the pod 'faultywebserver'

   kubectl get pod faultywebserver -o wide 
   

   Use describe command to identify the issue

   kubectl describe pod faultywebserver 
   

7. Now fix the pod and verify it runs correctly

   kubectl edit pod faultywebserver
   

   • edit file and change the following image: nnginx to be image: nginx

   • save and close the file

   • verify that changes worked

     kubectl get pod faultywebserver -o wide 
     

8. Delete all Pods in current namespace

   kubectl delete po --all
   

Creating Pods using YAML

1. Create new Namespace called 'mynamespace'

   kubectl create namespace mynamespace
   

2. Create new Pod called 'webserver' described using YAML into mynamespace

   Notice we used --dry-run flag

   •   kubectl run webserver --image=nginx --restart=Never --dry-run -o yaml > nginx-pod.yaml
     

   • View the file using VS Code (or any editor of choice)

   • Now create pod using YAML file

     kubectl apply -f nginx-pod.yaml -n mynamespace
     

3. Get the status, IP of the pod 'webserver'

   kubectl get pod webserver -o wide -n mynamespace 
   

4. change the image nginx in 'webserver' pod to use tag 1.16.0

   • edit the image field to include tag e.g. nginx:1.16.0 in the nginx-pod.yaml
   • Save the file
   • kubectl apply -f nginx-pod.yaml -n mynamespace

Pod Logs and Execs

1. Get 'webserver' pod logs

   kubectl logs webserver -n mynamespace 
   

2. Run list all the files within container nginx running on 'webserver' pod

   kubectl exec webserver -n mynamespace -- ls
   

3. Delete Namespace mynamespace

   kubectl delete namespace mynamespace
   

Delete all resources in the current namespace

kubectl delete all --all