How can you modify a ConfigMap in Kubernetes without restarting pods?

In Kubernetes, a ConfigMap can be updated without restarting pods if the pods use the ConfigMap through a volume and the automatic update mechanism is configured.

To do this:

1. Update the ConfigMap with the command:

kubectl apply -f configmap.yaml

2. If the ConfigMap is mounted as a volume, Kubernetes will automatically update the content in the pods within a few seconds (usually up to 1 minute).

3. If the application reads the configuration from files, it can detect the changes and apply them without a restart.

If the ConfigMap is used via environment variables, changes will not take effect without restarting the pod.

Thus, to make changes without restarting, the ConfigMap must be mounted as a volume, and the application should support dynamic configuration updates.