How to config Single node for Single Cluster (Standalone Cluster) ElasticSearch

Question

I installed elastic search in my local machine, I want to configure it as the only one single node in the cluster(Standalone Server). it means whenever I create a new index, it

Answer 1

I wanted to do this without having to write/overwrite an elasticsearch.yml in my container. Here it is without a config file

Set an environment variable prior to starting elasticsearch:

discovery.type=single-node

https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html

Answer 2

All of these didn´t help me (and I sadly didn´t read the answer of bhdrkn). The thing that worked for me was to change elasticsearch´s cluster-name everytime I need to have a separate instance, where new nodes aren´t added automatically via multicast.

Just change cluster.name: {{ elasticsearch.clustername }} in elasticsearch.yml, e.g. via Ansible. This is particulary helpful, when building separate Stages like Dev, QA and Production (which is a standard usecase in enterprise-environments).

And if you´re using logstash to get your data into elasticsearch, don´t forget to put the same cluster-name into the output-section, like:

output {
    elasticsearch {
        cluster => "{{ elasticsearch.clustername }}"
    }
}

Otherwise your "logstash-*"-index will not be build correctly...

Answer 3

In the config file, add:

• network.host: 0.0.0.0 [in Network settings]
• discovery.type: single-node [in Discovery and Cluster formation settings]