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Configurando nuestras aplicaciones: ConfigMaps

ConfigMap te permite definir un diccionario (clave,valor) para guardar información que puedes utilizar para configurar una aplicación.

Al crear un ConfigMap los valores se pueden indicar desde un directorio, un fichero o un literal.

kubectl create cm mariadb --from-literal=root_password=my-password \
                          --from-literal=mysql_usuario=usuario     \
                          --from-literal=mysql_password=password-user \
                          --from-literal=basededatos=test
configmap "mariadb" created

kubectl get cm
NAME      DATA      AGE
mariadb   4         15s

kubectl describe cm mariadb
Name:         mariadb
Namespace:    default
Labels:       <none>
Annotations:  <none>

Data
====
mysql_usuario:
----
usuario
root_password:
----
my-password
basededatos:
----
test
mysql_password:
----
password-user
Events:  <none>

Ahora podemos configurar el fichero yaml que define el despliegue, mariadb-deployment-configmap.yaml:

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: mariadb-deploy-cm
  labels:
    app: mariadb
    type: database
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: mariadb
        type: database
    spec:
      containers:
        - name: mariadb
          image: mariadb
          ports:
            - containerPort: 3306
              name: db-port
          env:
            - name: MYSQL_ROOT_PASSWORD
              valueFrom:
                configMapKeyRef:
                  name: mariadb
                  key: root_password
            - name: MYSQL_USER
              valueFrom:
                configMapKeyRef:
                  name: mariadb
                  key: mysql_usuario
            - name: MYSQL_PASSWORD
              valueFrom:
                configMapKeyRef:
                  name: mariadb
                  key: mysql_password
            - name: MYSQL_DATABASE
              valueFrom:
                configMapKeyRef:
                  name: mariadb
                  key: basededatos

Creamos el despliegue y probamos el acceso:

kubectl create -f mariadb-deployment-configmap.yaml
deployment.apps "mariadb-deploy-cm" created

kubectl get pods -l app=mariadb
NAME                                 READY     STATUS    RESTARTS   AGE
mariadb-deploy-cm-57f7b9c7d7-ll6pv   1/1       Running   0          15s

kubectl exec -it mariadb-deploy-cm-57f7b9c7d7-ll6pv -- mysql -u usuario -p
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 8
Server version: 10.2.15-MariaDB-10.2.15+maria~jessie mariadb.org binary distribution

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| test               |
+--------------------+
2 rows in set (0.00 sec)