Configuration

Upgrade the Enterprise Search specification

You can upgrade the Enterprise Search version or change settings by editing the YAML specification. ECK will apply the changes by performing a rolling restart of Enterprise Search pods.

Customize Enterprise Search configuration

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ECK sets up a default Enterprise Search configuration. To customize it, use the config element in the specification.

At a minimum, you must set both ent_search.external_url and kibana.host to the desired URLs.

apiVersion: enterprisesearch.k8s.elastic.co/v1
kind: EnterpriseSearch
metadata:
  name: enterprise-search-quickstart
spec:
  version: 8.16.1
  count: 1
  elasticsearchRef:
    name: quickstart
  config:
    # define the exposed URL at which users will reach Enterprise Search
    ent_search.external_url: https://my-custom-domain:3002
    # define the exposed URL at which users will reach Kibana
    kibana.host: https://kibana.my-custom-domain:5601
    # configure app search document size limit
    app_search.engine.document_size.limit: 100kb

Reference Kubernetes Secrets for sensitive settings

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Sensitive settings are best stored in Kubernetes Secrets, referenced in the Enterprise Search specification.

This example sets up a Secret with SMTP credentials:

apiVersion: enterprisesearch.k8s.elastic.co/v1
kind: EnterpriseSearch
metadata:
  name: enterprise-search-quickstart
spec:
  version: 8.16.1
  count: 1
  elasticsearchRef:
    name: quickstart
  config:
    ent_search.external_url: https://my-custom-domain:3002
    kibana.host: https://kibana.my-custom-domain:5601
  configRef:
    secretName: smtp-credentials
---
kind: Secret
apiVersion: v1
metadata:
  name: smtp-credentials
stringData:
  enterprise-search.yml: |-
    email.account.enabled: true
    email.account.smtp.auth: plain
    email.account.smtp.starttls.enable: false
    email.account.smtp.host: 127.0.0.1
    email.account.smtp.port: 25
    email.account.smtp.user: myuser
    email.account.smtp.password: mypassword
    email.account.email_defaults.from: my@email.com

ECK merges the content of config and configRef into a single internal Secret. In case of duplicate settings, the configRef secret has precedence.

Customize the Pod template

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You can override the Enterprise Search Pod’s specification through the podTemplate element.

This example overrides the default 4Gi deployment to use 8Gi instead, and makes the deployment highly-available with 3 Pods:

apiVersion: enterprisesearch.k8s.elastic.co/v1
kind: EnterpriseSearch
metadata:
  name: enterprise-search-quickstart
spec:
  version: 8.16.1
  count: 3
  elasticsearchRef:
    name: quickstart
  podTemplate:
    spec:
      containers:
      - name: enterprise-search
        resources:
          requests:
            cpu: 3
            memory: 8Gi
          limits:
            memory: 8Gi
        env:
        - name: JAVA_OPTS
          value: -Xms7500m -Xmx7500m

Customize the Pod template security context

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The Enterprise Search Pod’s security context can be customized through the podTemplate element. However, if readOnlyRootFilesystem is set to true without additional configuration, the Pod will fail to start. This happens because Enterprise Search (a Ruby service) requires write access to certain directories within /usr/share/enterprise-search, which include WAR files and configurations.

To work around this, use an init container to copy the necessary WAR files to a temporary writable location, before starting the Enterprise Search container with mounted writable volumes. Having the temporary directories (/tmp) in-memory also ensures Ruby has a temporary directory to work with during startup.

This example demonstrates the workaround:

apiVersion: enterprisesearch.k8s.elastic.co/v1
kind: EnterpriseSearch
metadata:
  name: testing
spec:
  version: 8.16.1
  image: docker.elastic.co/enterprise-search/enterprise-search:8.16.1
  count: 1
  elasticsearchRef:
    name: testing
  podTemplate:
    spec:
      containers:
        - name: enterprise-search
          image: docker.elastic.co/enterprise-search/enterprise-search:8.16.1
          securityContext: 
            readOnlyRootFilesystem: true
            runAsNonRoot: true
            allowPrivilegeEscalation: false
            runAsUser: 1000 
          volumeMounts: 
          - name: search-tmp
            mountPath: /usr/share/enterprise-search/tmp
          - name: tmp
            mountPath: /tmp
          - name: filebeat-data
            mountPath: /usr/share/enterprise-search/filebeat/data
          - name: war-files
            mountPath: /usr/share/enterprise-search/lib/war
          resources:
            requests:
              cpu: 3
              memory: 8Gi
            limits:
              memory: 8Gi
          env: 
          - name: JAVA_OPTS
            value: -Xms7500m -Xmx7500m
      initContainers: 
      - name: init-war-dir
        image: docker.elastic.co/enterprise-search/enterprise-search:8.16.1
        command: ['sh', '-c', 'cp --verbose -r /usr/share/enterprise-search/lib/war/. /usr/share/enterprise-search-war-tmp']
        volumeMounts:
        - name: war-files
          mountPath: /usr/share/enterprise-search-war-tmp
      volumes: 
      - name: war-files
        emptyDir: {}
      - name: filebeat-data
        emptyDir: {}
      - name: search-tmp
        emptyDir:
          medium: Memory
      - name: tmp
        emptyDir:
          medium: Memory

	Adds a security context to define permissions and access control settings for the `enterprise-search` container.
	Sets the user to random UID `1000` to run the container as a non-root user.
	Adds volume mounts for `search-tmp`, `tmp`, `filebeat-data`, and `war-files` to the `enterprise-search` container.
	Adds the variable `JAVA_OPTS` to pass options and configurations to the Java Virtual Machine (JVM).
	Adds an init container to copy WAR files to a temporary location.
	Adds volumes for WAR files and adds volumes with in-memory storage for `search-tmp` and `tmp`.

Expose Enterprise Search

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By default ECK manages self-signed TLS certificates to secure the connection to Enterprise Search. It also restricts the Kubernetes service to ClusterIP type that cannot be accessed publicly.

Check how to access Elastic Stack services to customize TLS settings and expose the service.

When exposed outside the scope of localhost, make sure to set both ent_search.external_url, and kibana.host accordingly in the Enterprise Search configuration.

Customize the connection to an Elasticsearch cluster

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The elasticsearchRef element allows ECK to automatically configure Enterprise Search to establish a secured connection to a managed Elasticsearch cluster. By default it targets all nodes in your cluster. If you want to direct traffic to specific nodes of your Elasticsearch cluster, refer to Traffic Splitting for more information and examples.

Connect to an external Elasticsearch cluster

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If you do not want to use the elasticsearchRef mechanism or if you want to connect to an Elasticsearch cluster not managed by ECK, you can manually configure Enterprise Search to access any available Elasticsearch cluster:

apiVersion: enterprisesearch.k8s.elastic.co/v1
kind: EnterpriseSearch
metadata:
  name: enterprise-search-quickstart
spec:
  version: 8.16.1
  count: 1
  configRef:
    secretName: elasticsearch-credentials
---
kind: Secret
apiVersion: v1
metadata:
  name: elasticsearch-credentials
stringData:
  enterprise-search.yml: |-
    elasticsearch.host: <a href="https://elasticsearch-url:9200" class="ulink" target="_top">https://elasticsearch-url:9200</a>
    elasticsearch.username: elastic
    elasticsearch.password: my-password
    elasticsearch.ssl.enabled: true

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