Volumes, ConfigMap & Secrets

It is an object type that you put pieces of data like configuration files and environment variables.

kubecctl create configmap NAME --from-file=FILE → create a quick configmap kubectl get configmaps → Show configmaps kubectl describe cm NAME → Describe cm (configmap)

Adding a ConfigMap Permanently

# Same indentation with 'containers:'
spec:
	containers:
	- name: nginx
	  image: nginx:1.14.2
	  volumeMounts:
	  - name: my_vol
	    mountPath: /hbroes
 
	volumes:
	  - name: my_vol
	    configMap:
		    name: heroes

Note: K8s will create folders if they don’t exist. ‘/heroes’ will be created automatically Another Note: The folder will be OVERWRITTEN. To prevent it, you can use subPath.

Secrets

They are a separate object type.

apiVersoin: v1
kind: Secret
metadata:
	name: mysql-secret
type: kubernetes.io/basic-auth
stringData:
	password: deneme

(You can also use command line kubectl create secret generic NAME --type=kubernetes.io/basic-auth --from-literal=password=deneme)

• kubectl get | describe secrests [SECRET_NAME]

Using Secret inside Manifest

spec:
  containers:
  - image: mysql:8-debian
    name: mysql
    env:
	- name: MYSQL_ROOT_PASSWORD
	  valueFrom: 
	    secretKeyRef:
	      name: mysql-secret
	      key: password # look for this key-value