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node-group-settings.md

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Node settings groups

You should to provide one or more node groups. A node groups is Elasticsearch nodes that share the same settings. For basic topology, you will create 3 nodes groups:

  • client: then endpoint nodes
  • master: the master nodes
  • data: the data nodes

The node group settings will be merged with the global settings.

You can use the following setting for each node group:

  • name (string / required): the node group name.
  • replicas (number / required): The number of instances
  • roles (slice of string / required): The list of node roles
  • persistence (object): The persistent volume to use to store Elasticsearch data. Default is emptyDir (not peristent)
  • antiAffinity (object): The pod anti affinity to use. Hard or soft and the key to use to compute it. Default is soft with the key kubernetes.io/hostname
    • type: The anti affinity type. Default to soft
    • topologyKey: The toplogy key to use to compute anti affinity. Default to kubernetes.io/hostname.
  • resources (object): The default resources for Elasticsearch pods. Default is empty. Read the official doc to know the properties
  • jvm (string): Set additionnal JVM options. Default is empty.
  • config (map of string): Each key is the file store on config folder. Each value is the file contend. It permit to set elasticsearch.yml settings. Default is empty.
  • podDisruptionBudget (object): The pod disruption budget to use. Default it allow to lost one pod per node groups. The selector is automatically set. Read the official doc to know the properties
  • podTemplate (object): The pod template to merge with the Elasticsearch pod template. Default is empty. Read the official doc to know the properties
  • labels (map of string): The labels to merge on pod. Default to empty.
  • annotations (map of string): The annotations to merge on pod. Default to empty.
  • env (slice of object): The environment variable to inject on Elasticsearch pod. Default to empty. Read the official doc to know the properties
  • envFrom (slice of object): The secret or configMap to inject as environement variable on Elasticsearch pod. Default to empty. Read the official doc to know the properties
  • waitClusterStatus (string): Wait the cluster status provided for readiness check. Default to green.
  • nodeSelector (map of string): The node slector constraint. Default to empty. Read the official doc to know the properties
  • tolerations (slice of object): The toleration to schedule pod on nodes. Default to empty. Read the official doc to know the properties

elasticsearch.yaml:

apiVersion: elasticsearch.k8s.webcenter.fr/v1
kind: Elasticsearch
metadata:
  labels:
    socle: cluster-dev
  name: elasticsearch
  namespace: cluster-dev
spec:
  nodeGroups:
    - name: master
      persistence:
        volumeClaim:
          accessModes:
            - ReadWriteOnce
          resources:
            requests:
              storage: 2Gi
          storageClassName: openebs-hostpath
      replicas: 3
      resources:
        limits:
          cpu: '2'
          memory: 4Gi
        requests:
          cpu: '2'
          memory: 4Gi
      roles:
        - master
    - name: data
      nodeSelector:
        project: cluster-prd-data
      persistence:
        volumeClaim:
          accessModes:
            - ReadWriteOnce
          resources:
            requests:
              storage: 1300Gi
          storageClassName: openebs-hostpath
      replicas: 5
      podDisruptionBudget:
        maxUnavailable: 2
      resources:
        limits:
          cpu: '11'
          memory: 62Gi
        requests:
          cpu: '11'
          memory: 62Gi
      roles:
        - data_hot
        - data_content
      tolerations:
        - effect: NoSchedule
          key: project
          operator: Equal
          value: cluster-prd-hot
      config:
        elasticsearch.yml: |
          node.attr.data: "warm"
      antiAffinity:
        topologyKey: topology.kubernetes.io/zone
        type: hard
    - name: client
      persistence:
        volumeClaim:
          accessModes:
            - ReadWriteOnce
          resources:
            requests:
              storage: 2Gi
          storageClassName: openebs-hostpath
      replicas: 2
      resources:
        limits:
          cpu: '2'
          memory: 4Gi
        requests:
          cpu: '2'
          memory: 4Gi
      roles:
        - ingest
      waitClusterStatus: yellow
      podTemplate:
        spec:
          containers:
            - name: elasticsearch
                command:
                  - custom command
      jvm: '-Xmx1G - Xms1G'
      labels:
        label1: my label
      annotations:
        annotation1: my annotation
      envFrom:
        - secretRef:
            name: elasticsearch-env
      env:
        - name: LDAP_USERNAME
          value: ldap_user

elasticsearch-env-secret.yaml:

apiVersion: v1
kind: Secret
metadata:
  name: elasticsearch-env
  namespace: cluster-dev
type: Opaque
data:
  ELASTICSEARCH_LDAP_USER: ++++++++