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All About ConfigMap in GKE

by | Jul 9, 2023

Learn more about configMap in GKE from our experts. Our Google Cloud Support team is here to help you with your questions and concerns.

All About configMap in GKE

In GKE (Google Kubernetes Engine), a ConfigMap is a Kubernetes resource. It helps store configuration data that can be consumed by containers running in a cluster.

All About configMap in GKE

Furthermore, it offers a way to decouple configuration from the container images. This offers more flexibility and easier management of configuration settings.

Today, we are going to take a look at how to define a ConfigMap:

  1. First, we have to specify key-value pairs in a YAML or JSON file.

    For instance, we have to create a file named configmap.yaml with this content:

    apiVersion: v1 kind: ConfigMap metadata: name: my-configmap data: KEY1: value1 KEY2: value2

    Here, the ConfigMap named my-configmap has two key-value pairs: KEY1 with the value value1 and KEY2 with the value value2. Additionally, we can add more key-value pairs as and when needed.

  2. Next, it is time to apply the ConfigMap to our GKE cluster as seen here:

    kubectl apply -f configmap.yaml

    The above command creates the ConfigMap in our GKE cluster.

  3. Then, we can use the ConfigMap in a Pod, by mounting it as environment variables or as a volume.
  4. Now it is time to modify the Pod’s YAML file to include the env section with the environment variables referencing the ConfigMap keys.

    apiVersion: v1 kind: Pod metadata: name: my-pod spec: containers: - name: my-container image: my-image env: - name: ENV_VAR1 valueFrom: configMapKeyRef: name: my-configmap key: KEY1 - name: ENV_VAR2 valueFrom: configMapKeyRef: name: my-configmap key: KEY2

    This will mount the values of KEY1 and KEY2 from the my-configmap ConfigMap as environment variables in the Pod.

  5. We can also modify the Pod’s YAML file to include a volumes section and a volume mount inside the containers section as seen here:

    apiVersion: v1 kind: Pod metadata: name: my-pod spec: containers: - name: my-container image: my-image volumeMounts: - name: config-volume mountPath: /etc/config volumes: - name: config-volume configMap: name: my-configmap

    This will mount the ConfigMap my-configmap as a volume at the path /etc/config inside the Pod.

  6. Then, we can apply the modified Pod YAML file as seen here:

    kubectl apply -f pod.yaml

The above steps will create a COnfigMap in GKE and used it in a Pod.

Let us know in the comments if you need further help.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

In brief, our Support Techs introduced us to about configMap in GKE.

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