Separate cluster and node level configurations

[sunzhu]

Currently the configurations for the cluster and node are mixed together in the same elasticsearch.yml file. This make it hard to sync cluster level configurations as I have to edit elasticsearch.yml on all nodes one by one manually because they have different node level configurations such as paths and publish host etc.

[clintongormley]

Hi @sunzhu

What we recommend doing is to put the cluster-wide settings into elasticsearch.yml and to set the node specific settings on the command line or in the $ES_JAVA_OPTS environment variable.

[sunzhu]

thanks. It sounds reasonable. I still have 2 questions:

1. Will the configurations in elasticsearch.yml overwrite command line or vice versa?
2. Can all the node level configurations be set on the command line?

[clintongormley]

1. Will the configurations in elasticsearch.yml overwrite command line or vice versa?

Generally yes, but see #6887

1. Can all the node level configurations be set on the command line?

Yes, you can set any setting on the command line

[sunzhu]

OK, I will try the solution.