README.md

Config Map

Config Map
Tips and Tricks

For simulated Practice problems visit KillerCoda.

1. Create a config map myconfig with var1=val1

   Solution

   k create configmap myconfig --from-literal=var1=val1

2. Create a config map fileconfig from a file created below, with userdetails key.

     echo "username=admin" > user.txt

   Solution

   k create configmap fileconfig --from-file=userdetails=user.txt

3. create gconfig configmap with ability=thunder. Run a pod named aries with nginx image having env variable named power getting value from ability key of gconfig configmap.

   Solution

   # create configmap
   k create configmap gconfig --from-literal=ability=thunder
   
   # generate pod yaml file $dr(export dr="--dry-run=client -o yaml")
   k run aries --image=nginx $dr > pod.yaml
   
   # modify pod.yaml
   apiVersion: v1
   kind: Pod
   metadata:
     creationTimestamp: null
     labels:
       run: aries
     name: aries
   spec:
     containers:
     - image: nginx
       name: aries
       env:
         - name: power
           valueFrom:
             configMapKeyRef:
               name: gconfig
               key: ability
     dnsPolicy: ClusterFirst
     restartPolicy: Always
   status: {}
   
   # to check the env variable
   k exec aries -ti -- env

4. create tconfig configmap with var9=val9. Run a pod named tarz with nginx image having mounting tconfig as a volume at path /delta and name core. Do all these in taurus namespace.

   Solution

   # create the ns
   k create ns taurus
   
   # set it as default namespace
   k config set-context --current --namespace=taurus
   
   # create configmap
   k create configmap tconfig --from-literal=var9=val9
   
   # generate pod yaml file $dr(export dr="--dry-run=client -o yaml")
   k run tarz --image=nginx $dr > pod.yaml
   
   # modify pod.yaml
   apiVersion: v1
   kind: Pod
   metadata:
     creationTimestamp: null
     labels:
       run: tarz
     name: tarz
   spec:
     volumes:
       - name: core
         configMap:
           name: tconfig
     containers:
     - image: nginx
       name: tarz
       volumeMounts:
         - name: core
           mountPath: /delta
     dnsPolicy: ClusterFirst
     restartPolicy: Always
   status: {}