./elasticsearch -E node.name=node0 ... can not run elasticsearch as root

[rick_zhang]

i have try to run a command start up elasticsearch node,"./elasticsearch -E node.name=node0 -E cluster.name=elasticsearch -E path.data=node0_data
",but still not work have a error message, what is worry?

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
[2019-07-01T23:44:11,991][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [node0] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-7.2.0.jar:7.2.0]
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.2.0.jar:7.2.0]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349) ~[elasticsearch-7.2.0.jar:7.2.0]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-7.2.0.jar:7.2.0]
... 6 more

[dadoonet (David Pilato)]

You can not start elasticsearch a root user.

Make sure you read the installation documentation: https://www.elastic.co/guide/en/elasticsearch/reference/7.2/install-elasticsearch.html depending on your OS and the way you want to install it.

[rick_zhang]

thanks,you means i must using sudo apt install,not using root user ,apt install. but i have a confuse ,why not need root usr ?

[dadoonet (David Pilato)]

I'd recommend reading this Elastic Install and Run - Root or Not?

[rick_zhang]

thanks you replay,very usefully.