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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.

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.

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Conclusion

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