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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 Namespace as a variable by replacing the {namespace} placeholder in the following command and running it:

    export K8S_NAMESPACE="{namespace}"
export KYMA_EXAMPLE_DOMAIN="{kyma domain}"

  2. Create a Redis instance:

    kubectl apply -f deployment/redis-instance.yaml -n $K8S_NAMESPACE

  3. Ensure that the Redis instance is provisioned:

    kubectl get serviceinstance/redis-instance -o jsonpath='{ .status.conditions[0].reason }' -n $K8S_NAMESPACE

  4. Create a Redis client through a lambda function, along with the ServiceBinding, and the ServiceBindingUsage custom resource:

    kubectl apply -f deployment/lambda-function.yaml -n $K8S_NAMESPACE

  5. Ensure that the Redis ServiceBinding works:

    kubectl get servicebinding/redis-instance-binding -o jsonpath='{ .status.conditions[0].reason }' -n $K8S_NAMESPACE

  6. Verify that the lambda function is ready:

    kubeless function ls redis-client -n $K8S_NAMESPACE

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

     curl -ik https://redis-client.$KYMA_EXAMPLE_DOMAIN

Cleanup

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

kubectl delete all,api,function,servicebinding,serviceinstance,servicebindingusage -l example=service-binding -n $K8S_NAMESPACE

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 $K8S_NAMESPACE -it $(kubectl get po -n $K8S_NAMESPACE -l example=service-binding-lambda --no-headers | awk '{print $1}') bash

env | grep -i redis_password