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Bind a Service to a Lambda Function

Overview

This example shows how to bind lambda functions to a service. A lambda function connects to a Redis instance and retrieves statistics for this service.

The example covers these tasks:

  1. Create a Redis instance.
  2. Create a function using Kubeless CLI.
  3. Bind the function to the Redis Service.
  4. Call the lambda function.

Prerequisites

Installation

Apply a battery of yaml files to run the example.

Steps

  1. Export your environment as variable by replacing the <environment> placeholder in the following command and running it:

    export KYMA_EXAMPLE_ENV="<environment>"

  2. Create a Redis instance and a service binding to the instance.

    kubectl apply -f deployment/redis-instance.yaml,deployment/redis-instance-binding.yaml -n $KYMA_EXAMPLE_ENV

  3. Ensure that the Redis instance and Redis binding service are provisioned.

    kubectl get serviceinstance/redis-instance -o jsonpath='{ .status.conditions[0].reason }' -n $KYMA_EXAMPLE_ENV

kubectl get servicebinding/redis-instance-binding -o jsonpath='{ .status.conditions[0].reason }' -n $KYMA_EXAMPLE_ENV

  4. Create a lambda function as Redis client.

    kubectl apply -f deployment/lambda-function.yaml -n $KYMA_EXAMPLE_ENV

  5. Create a ServiceBindingUsage resource.

    kubectl apply -f deployment/service-binding-usage.yaml -n $KYMA_EXAMPLE_ENV

  6. Verify that the lambda function is ready.

    kubeless function ls redis-client -n $KYMA_EXAMPLE_ENV

  7. Trigger the function. The information and statistics about the Redis server appear in the logs of the function Pod.

    kubeless function call redis-client -n $KYMA_EXAMPLE_ENV

Cleanup

Use this command to remove the example and all its resources from your Kyma cluster:

kubectl delete all,function,servicebinding,serviceinstance,servicebindingusage -l example=service-binding -n $KYMA_EXAMPLE_ENV

Troubleshooting

Make sure the password is injected correctly into the Pod. The password should match the one in the redis-instance.yaml

kubectl exec -n $KYMA_EXAMPLE_ENV -it $(kubectl get po -n $KYMA_EXAMPLE_ENV -l example=service-binding --no-headers | awk '{print $1}') bash

env | grep -i redis_password