Connect to an Elasticsearch cluster

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Connect to an Elasticsearch cluster

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You can connect an Elasticsearch cluster that is either managed by ECK or not managed by ECK.

Elasticsearch is managed by ECK

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It is quite straightforward to connect a Kibana instance to an Elasticsearch cluster managed by ECK:

apiVersion: kibana.k8s.elastic.co/v1
kind: Kibana
metadata:
  name: quickstart
spec:
  version: 8.16.1
  count: 1
  elasticsearchRef:
    name: quickstart
    namespace: default

The use of namespace is optional if the Elasticsearch cluster is running in the same namespace as Kibana. An additional serviceName attribute can be specified to target a custom Kubernetes service. Refer to Traffic Splitting for more information.

Any Kibana can reference (and thus access) any Elasticsearch instance as long as they are both in namespaces that are watched by the same ECK instance. ECK will copy the required Secret from Elasticsearch to Kibana namespace. Kibana cannot automatically connect to Elasticsearch (through elasticsearchRef) in a namespace managed by a different ECK instance. For more information, check Restrict cross-namespace resource associations.

The Kibana configuration file is automatically setup by ECK to establish a secure connection to Elasticsearch.

Elasticsearch is not managed by ECK

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You can also configure Kibana to connect to an Elasticsearch cluster that is managed by a different installation of ECK, or runs outside the Kubernetes cluster. In this case, you need the IP address or URL of the Elasticsearch cluster and a valid username and password pair to access the cluster.

Use the secure settings mechanism to securely store the credentials of the external Elasticsearch cluster:

kubectl create secret generic kibana-elasticsearch-credentials --from-literal=elasticsearch.password=$PASSWORD

apiVersion: kibana.k8s.elastic.co/v1
kind: Kibana
metadata:
  name: kibana-sample
spec:
  version: 8.16.1
  count: 1
  config:
    elasticsearch.hosts:
      - https://elasticsearch.example.com:9200
    elasticsearch.username: elastic
  secureSettings:
    - secretName: kibana-elasticsearch-credentials

If the external Elasticsearch cluster is using a self-signed certificate, create a Kubernetes Secret containing the CA certificate and mount it to the Kibana container as follows:

apiVersion: kibana.k8s.elastic.co/v1
kind: Kibana
metadata:
  name: kibana-sample
spec:
  version: 8.16.1
  count: 1
  config:
    elasticsearch.hosts:
      - https://elasticsearch-sample-es-http:9200
    elasticsearch.username: elastic
    elasticsearch.ssl.certificateAuthorities: /etc/certs/ca.crt
  secureSettings:
    - secretName: kibana-elasticsearch-credentials
  podTemplate:
    spec:
      volumes:
        - name: elasticsearch-certs
          secret:
            secretName: elasticsearch-certs-secret
      containers:
        - name: kibana
          volumeMounts:
            - name: elasticsearch-certs
              mountPath: /etc/certs
              readOnly: true

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