You are looking at the documentation of a prior release. To read the documentation of the latest release, please visit here.

Configure Elasticsearch JVM Options

The Elasticsearch offers users to configure the JVM settings by using jvm.options file. The jvm.options file located at the $ES_HOME/config (ie. /usr/share/elasticsearch/config) directory.

Deploy Elasticsearch with Custom jvm.options File

Before deploying the Elasticsearch instance, you need to create a k8s secret with the custom config files (here: jvm.options).

apiVersion: v1
kind: Secret
metadata:
  name: es-custom-config
  namespace: demo
stringData:
  jvm.options: |-
    ## G1GC Configuration

    10-:-XX:+UseG1GC
    10-13:-XX:-UseConcMarkSweepGC
    10-13:-XX:-UseCMSInitiatingOccupancyOnly
    10-:-XX:G1ReservePercent=25
    10-:-XX:InitiatingHeapOccupancyPercent=30

    ## JVM temporary directory
    -Djava.io.tmpdir=${ES_TMPDIR}

    ## heap dumps

    # generate a heap dump when an allocation from the Java heap fails
    # heap dumps are created in the working directory of the JVM
    -XX:+HeapDumpOnOutOfMemoryError

    # specify an alternative path for heap dumps; ensure the directory exists and
    # has sufficient space
    -XX:HeapDumpPath=data

    # specify an alternative path for JVM fatal error logs
    -XX:ErrorFile=logs/hs_err_pid%p.log

    # JDK 9+ GC logging
    9-:-Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m    

If you want to provide node-role specific settings, say you want to configure ingest nodes with a different setting than others in a topology cluster, add node role as a prefix in the file name.

stringData:
  ingest-jvm.options: |-
    ... ...    
  master-jvm.options: |-
    ... ...    
  ... ... 

Deploy the k8s secret:

kubectl apply -f https://github.com/kubedb/docs/raw/v2023.08.18/docs/guides/elasticsearch/configuration/jvm-options/yamls/custom-config.yaml
secret/es-custom-config created

Now Deploy the Elasticsearch Cluster with the custom jvm.options file:

apiVersion: kubedb.com/v1alpha2
kind: Elasticsearch
metadata:
  name: es-test
  namespace: demo
spec:
  # Make sure that you've mentioned the config secret name here
  configSecret:
    name: es-custom-config
  enableSSL: false 
  version: opendistro-1.12.0
  storageType: Durable
  terminationPolicy: WipeOut
  topology:
    master:
      suffix: master
      replicas: 3
      storage:
        storageClassName: "standard"
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 1Gi
    data:
      suffix: data
      replicas: 2 
      storage:
        storageClassName: "standard"
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 5Gi
    ingest:
      suffix: ingest
      replicas: 2
      storage:
        storageClassName: "standard"
        accessModes:
        - ReadWriteOnce
        resources:
          requests:
            storage: 1Gi

Deploy Elasticsearch:

$ kubectl apply -f https://github.com/kubedb/docs/raw/v2023.08.18/docs/guides/elasticsearch/configuration/jvm-options/yamls/elasticsearch.yaml
elasticsearch/es-test created

Wait for the Elasticsearch to become ready:

$ kubectl get elasticsearch -n demo -w
NAME          VERSION             STATUS         AGE
es-test       opendistro-1.12.0   Provisioning   12s
es-test       opendistro-1.12.0   Provisioning   2m2s
es-test       opendistro-1.12.0   Ready          2m2s