5. Kubernetes: ConfigMap

Published: 23 July 2022
on channel: iMustLearn

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vi env.properties
env_sever=node1
env_name=myConfig

kubectl create configmap myconfigmap-1 --from-env-file=env.properties

kubectl get configmap myconfigmap-1 -o yaml

kubectl create configmap myconfigmap-2 --from-literal=env_sever=node1 --from-literal=env_name=myConfig

kubectl get configmaps myconfigmap-2 -o yaml

** Example:1 ***
vi myconfigmap3.yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: myconfigmap-3
namespace: default
data:
env_text1: Hello
env_text2: Students

kubectl create -f myconfigmap3.yaml

kubectl get ConfigMap

** Example:2 **
vi my-configmap-pod.yaml

apiVersion: v1
kind: Pod
metadata:
name: mypod-configmap
spec:
containers:
name: mybusybox
image: busybox
command: ['sh', '-c', "echo $(env_text1_key) $(env_text2_key) && sleep 3600"]
env:
name: env_text1_key
valueFrom:
configMapKeyRef:
name: myconfigmap-3
key: env_text1
name: env_text2_key
valueFrom:
configMapKeyRef:
name: myconfigmap-3
key: env_text2
restartPolicy: Never

kubectl create -f my-configmap-pod.yaml

kubectl get pods

kubectl logs mypod-configmap

kubectl exec mypod-configmap -- printenv

** Example:3 **
vi my-config-vol.yaml

apiVersion: v1
kind: Pod
metadata:
name: my-config-vol-pod
spec:
containers:
name: my-config-vol-container
image: busybox
command: ['sh', '-c', "echo $(ls /etc/config/) && sleep 3600"]
volumeMounts:
name: my-config-volume
mountPath: /etc/config
volumes:
name: my-config-volume
configMap:
name: myconfigmap-3
restartPolicy: Never

kubectl create -f my-config-vol.yaml

kubectl get pods

kubectl logs my-config-vol-pod

kubectl exec my-config-vol-pod -- cat /etc/config/env_text1

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