README.md

Labels and Selectors

Labels and Selectors
Tips and Tricks

For simulated Practice problems visit KillerCoda.

1. name a pod sumo with image nginx and label it tier=frontend

   Solution

   k run sumo --image=nginx --labels=tier=frontend

   --OR--

   # update metadata of pod yaml
   apiVersion: v1
   kind: Pod
   metadata:
     creationTimestamp: null
     labels: # add label
       tier: frontend
     name: sumo
   spec:
     containers:
     - image: nginx
       name: sumo
       resources: {}
     dnsPolicy: ClusterFirst
     restartPolicy: Always
   status: {}

   verify labels on pods running

     k get po --show-labels

2. create 3 pods named one, two and three with image nginx:alpine and label them resource=alpha, resource=beta and resource=gama respectively.

   Solution

   k run one --image=nginx:alpine --labels=resource=alpha
   
   k run two --image=nginx:alpine --labels=resource=beta
   
   k run three --image=nginx:alpine --labels=resource=gama

3. Add label tier=backend to pods one,two and three

   Solution

   k label pod one two three tier=backend

4. Add label app_version=v1 to pods having labels tier=frontend or tier=backend.

   Solution

   k label pod -l "tier in (frontend,backend)" app_version=v1

5. Update label app_version=v2 on pod two

   Solution

   k label pod two app_version=v2 --overwrite

6. Remove label app_version on pod one

   Solution

   k label pod one app_version-