You’ve stumbled upon my secret hiding spot! Or just the place I go to look up things I sometimes forget, but hey, thanks for stopping by anyway.

ConfigMap: Creation

IMPERATIVE LITERALS

$ kubectl create configmap appconfigmap \
  --from-literal=name=mclane \
  --from-literal=catchphrase=yippeekiyay

IMPERATIVE FROM FILE

NOTE: Remember, when using a file that the key will be the name of the file used. In this case, config.txt is the key and will contain the entire contents of the db-info file.

$ kubectl create configmap appconfigmap --from-file config.txt 

DECLARATIVE MULTIPLE ENTRIES

apiVersion: v1
data:
  config.txt: |
    name=gruber
    home: nakatomi
kind: ConfigMap
metadata:
  name: appconfigmap

DECLARATIVE SINGLE ENTRIES

apiVersion: v1
data:
  catchphrase: yippeekiyay
  name: mclane
kind: ConfigMap
metadata:
  name: appconfigmap

---

Mount a ConfigMap in a Pod

As a Volume

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: nginxsec
  name: nginxsec
spec:
  containers:
  - image: nginx
    name: nginxsec
    volumeMounts:
    - name: configmap
      mountPath: /tmp
  volumes: 
  - name: configmap
    configMap:
      Name: appconfigmap

ConfigMaps as Environment Variables [Individual]

apiVersion: v1
kind: Pod
metadata:
  labels:
  name: nginxenv
spec:
  containers:
  - image: nginx
    name: nginx
    env: 
    - name: DB_USER
      valueFrom:
        configMapKeyRef:
          name: appConfigMap
          key: name

ConfigMaps as Environment Variables [–from-env-file]

apiVersion: v1
kind: Pod
metadata:
  labels:
  name: nginxenv
spec:
  containers:
  - image: nginx
    name: nginx
    envFrom:
      - configMapRef: 
          name: appConfigMap