Readme.md

Config Map Demo

1. Create a configmap from file myconfig

   apiVersion: v1
   kind: ConfigMap
   metadata:
       name: myconfig
   data:
       MYSQL_ROOT_PASSWORD: Password@123
       MYSQL_USER: mahendra
       MYSQL_PASSWORD: Password@1234
       MYSQL_DATABASE: data1
       MYSQL_ROOT_HOST: 127.0.0.1

   Now, run following commands:

   $ kubectl apply -f ./myconfig.yml
   $ kubectl describe -f ./myconfig.yml

2. Create a pod that uses ConfigMap pod

   apiVersion: v1  
   kind: Pod       
   metadata:
       name: pod3    
       labels:       
           name: web3
   
   spec:
       containers:
       -   name: db1
           image: mysql:5.7 
           envFrom:
           - configMapRef:
               name: myconfig
           resources:
               limits:
                   memory: "512Mi"
                   cpu: "500m"
           ports:
           - containerPort: 3306
       -   name: test
           image: mahendrshinde/mysql-client:latest
           imagePullPolicy: IfNotPresent
           command: ['sh','-c','echo Hello World && sleep 3600']
           resources:
               limits:
                   memory: "64Mi"
                   cpu: "100m"

   Now, run following commands:

   $ kubectl apply -f ./pod-3.yaml
   $ kubectl get pods

3. Once, pod status for "pod3" chages to RUNNING, try entering inside the pod.

   $ kubectl exec -it pod3 -c test -- sh  
   # try connecting mysql server (Use loopback ip or pod name)
   $ mysql -umahendra -pPassword@1234 -h pod3
   $ exit
   $ exit

4. Delete the resources

   $ kubectl delete -f pod-3.yaml
   $ kubectl delete -f myconfig.yml