Start up ES with environment and variables in systemd

Elastic Stack Elasticsearch
1

For config directory, I am trying to "eliminate" the need to use the elasticsearch.yml for each instance by having each instance start up with the environment and variables.

Eg. Using systemd
Environment="ES_JAVA_OPTS=-Xms1g Xmx1g"
ExecStart=/opt/elasticsearch/bin/elasticsearch
-Ecluster.name=production
-Ecluster.initial_master_nodes=es01,es02,es03
-Ediscovery.seed_hosts=192.168.100.1,192.168.100.2,192.168.100.3
-Enetwork.host=192.168.100.1
-Ehttp.port=9200
-Enode.name=es01
-Epath.logs=/var/log/elasticsearch/es01
-Epath.data=/data/es01

Seems that all the required settings can be placed in the service file and "eliminate" the need to use elasticsearch.yml.

Is there any caveat in doing this?

2

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