Running Heartbeat on Kubernetes

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Running Heartbeat on Kubernetes

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Heartbeat Docker images can be used on Kubernetes to check resources uptime.

Running Elastic Cloud on Kubernetes? See Run Beats on ECK

Kubernetes deploy manifests

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A single Heartbeat can check for uptime of the whole cluster.

Everything is deployed under kube-system namespace, you can change that by updating the YAML file.

To get the manifests just run:

curl -L -O https://raw.githubusercontent.com/elastic/beats/8.17/deploy/kubernetes/heartbeat-kubernetes.yaml

If you are using Kubernetes 1.7 or earlier: Heartbeat uses a hostPath volume to persist internal data, it’s located under /var/lib/heartbeat-data. The manifest uses folder autocreation (DirectoryOrCreate), which was introduced in Kubernetes 1.8. You will need to remove type: DirectoryOrCreate from the manifest and create the host folder yourself.

Settings

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Some parameters are exposed in the manifest to configure logs destination, by default they will use an existing Elasticsearch deploy if it’s present, but you may want to change that behavior, so just edit the YAML file and modify them:

- name: ELASTICSEARCH_HOST
  value: elasticsearch
- name: ELASTICSEARCH_PORT
  value: "9200"
- name: ELASTICSEARCH_USERNAME
  value: elastic
- name: ELASTICSEARCH_PASSWORD
  value: changeme

Deploy

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To deploy Heartbeat to Kubernetes just run:

kubectl create -f heartbeat-kubernetes.yaml

Then you should be able to check the status by running:

$ kubectl --namespace=kube-system get deployment/heartbeat

NAME        READY   UP-TO-DATE   AVAILABLE   AGE
heartbeat   1/1     1            1           1m

Running Heartbeat as unprivileged user

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Under Kubernetes, Heartbeat can run as a non-root user, but requires some privileged network capabilities to operate correctly. Ensure that the NET_RAW capability is available to the container.

containers:
- name: heartbeat
  image: docker.elastic.co/beats/heartbeat:8.17.0
  securityContext:
    runAsUser: 1000
    runAsGroup: 1000
    capabilities:
      add: [ NET_RAW ]

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