Tutorial: Monitor Redis running on Kubernetes

If you have a service running on Kubernetes, and it's a service we support, you can enable monitoring of that service by adding a configuration section for that integration to the Kubernetes integration's config.

This tutorial shows how to enable monitoring for a Redis service running on the Kubernetes PHP Guestbook. For the general procedure, see Monitor a Kubernetes-running service.

What you need

• See the general requirements for this feature, including supported services.
• The kubectl command-line tool must be configured to communicate with your cluster. If you don't have a cluster, you can create one using Minikube.

Step 1: Set up an example Redis application

This tutorial builds on the Kubernetes tutorial Deploying a PHP Guestbook application with Redis. Skip the Kubernetes tutorial and run the following command to set up the application needed for our tutorial:

$
kubectl create -f https://raw.githubusercontent.com/kubernetes/examples/master/guestbook/all-in-one/guestbook-all-in-one.yaml

If you'd like to first complete the Kubernetes tutorial, follow their tutorial instructions but do not follow the instructions in the Cleaning up section.

Step 2: Enable monitoring of Redis instances

The PHP Guestbook application has three Redis instances: one master and two replica instances. Each instance is tagged with a label where app=redis. For this example, we're using our Redis monitoring integration. It can monitor both master and replica instances of Redis, so we don’t have to distinguish between them.

1. In the values-newrelic.yaml YAML file for our helm chart you need to update the newrelic-infrastructure.integrations section. From the list of integration configs, get the Redis integration YAML and add it to the Kubernetes config. The Redis-specific configuration is contained under the redis-config.yml: key:

   newrelic-infrastructure:
     integrations:
       redis-config.yml:
         # Run auto discovery to find pods with label "app=redis"
         # https://docs.newrelic.com/docs/integrations/host-integrations/installation/container-auto-discovery
         discovery:
           command:
             # Run discovery for Kubernetes. Use the following optional arguments:
             # --namespaces: Comma separated list of namespaces to discover pods on
             # --tls: Use secure (TLS) connection
             # --port: Port used to connect to the kubelet. Default is 10255
             exec: /var/db/newrelic-infra/nri-discovery-kubernetes --tls --port 10250
             match:
               label.app: redis
         integrations:
           - name: nri-redis
             env:
               # using the discovered IP as the hostname address
               HOSTNAME: ${discovery.ip}
               PORT: 6379
               KEYS: '{"0":["<KEY_1>"],"1":["<KEY_2>"]}'
               labels:
                 env: production

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2. Deploy the updated service:

   bash

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   $
   helm upgrade --install newrelic newrelic/nri-bundle \
   >
   --namespace newrelic --create-namespace \
   >
   -f values-newrelic.yaml \
   >
   --devel

   You should be able to see the following in the logs for the nrk8s-kubelet pod that is scheduled in the same node as the service you want to monitor:

   bash

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   $
   kubectl logs -n newrelic newrelic-nrk8s-kubelet-xxxxx agent

   time="2019-12-23T17:37:07Z" level=info msg="Integration health check starting" instance=redis-metrics integration=com.newrelic.redis prefix=integration/com.newrelic.redis working-dir=/var/db/newrelic-infra/newrelic-integrations
   time="2019-12-23T17:37:07Z" level=info msg="Integration health check finished with success" instance=redis-metrics integration=com.newrelic.redis prefix=integration/com.newrelic.redis working-dir=/var/db/newrelic-infra/newrelic-integrations

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If there are no errors, you should see Redis data in the infrastructure UI. To find the Redis dashboards, go to one.newrelic.com > All capabilities > Infrastructure > Third party services, and select the Redis dashboard.

For the general procedure of how to monitor services running on Kubernetes, including more detail about how configuration works, see Monitor a Kubernetes-running service.