Deploy an Elasticsearch instance

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Deploy an Elasticsearch instance

Create an Elasticsearch cluster. If you are using the Daemonset described in the Virtual memory section to set max_map_count you can add the initContainer below is also used to ensure the setting is set prior to starting Elasticsearch.

cat <<EOF | kubectl apply -f -
apiVersion: elasticsearch.k8s.elastic.co/v1
kind: Elasticsearch
metadata:
  name: elasticsearch-sample
spec:
  version: 8.18.0
  nodeSets:
  - name: default
    count: 1
    # Only uncomment the below section if you are not using the Daemonset to set max_map_count.
    # config:
    #  node.store.allow_mmap: false
    podTemplate:
      spec:
        # This init container ensures that the max_map_count setting has been applied before starting Elasticsearch.
        # This is not required, but is encouraged when using the previously mentioned Daemonset to set max_map_count.
        # Do not use this if setting config.node.store.allow_mmap: false
        initContainers:
        - name: max-map-count-check
          command: ['sh', '-c', "while true; do mmc=$(cat /proc/sys/vm/max_map_count); if [ ${mmc} -eq 262144 ]; then exit 0; fi; sleep 1; done"]
EOF

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