====== Gerenciar Configmaps no Kubernetes ======
<code bash>
$ kubectl create configmap variaveis --from-literal VAR1=VALOR1 --from-literal VAR2=VALOR2 --from-literal VAR3=VALOR3
configmap/variaveis created
</code>

<code bash>
$ kubectl get configmaps
NAME               DATA   AGE
kube-root-ca.crt   1      4d15h
variaveis          3      66s
</code>

<code bash>
$ kubectl describe cm variaveis
Name:         variaveis
Namespace:    default
Labels:       <none>
Annotations:  <none>

Data
====
VAR1:
----
VALOR1
VAR2:
----
VALOR2
VAR3:
----
VALOR3

BinaryData
====

Events:  <none>
</code>

<code yaml>
$ cat bashrc-configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: bashrc-configmap
data:
  PS1: '${debian_chroot:+($debian_chroot)}\h:\w\$ '
  TERM: linux
</code>

<code bash>
$ kubectl apply -f bashrc-configmap.yaml
configmap/bashrc-configmap created
</code>

<code yaml>
$ cat pod-configmap.yaml
apiVersion: v1
kind: Pod
metadata:
  name: pod-configmap
spec:
  containers:
  - name: busybox
    image: busybox:1.28
    imagePullPolicy: IfNotPresent
    command:
      - sleep
      - "3600"
    envFrom:
      - configMapRef:
          name: bashrc-configmap
</code>

  * **envFrom**: Define todos os dados do ConfigMap como variáveis de ambiente do conitainer. A chave do ConfigMap se torna o nome da variável de ambiente no Pod.
  * **configMapRef**: Define que sera utilizado um ConfigMap.
  * **name**: Define o nome do ConfigMap

<code bash>
$ kubectl apply -f pod-configmap.yaml
pod/pod-configmap created
</code bash>

<code bash>
$ kubectl exec -it pod-configmap -- env | grep PS1
PS1=${debian_chroot:+($debian_chroot)}\h:\w\$
</code>

<code bash>
$ kubectl delete -f bashrc-configmap.yaml,pod-configmap.yaml
configmap "bashrc-configmap" deleted
pod "pod-configmap" deleted
</code>

<code bash>
$ kubectl delete cm variaveis
configmap "variaveis" deleted
</code>