Question: Java lang.RuntimeException: can not run elasticsearch as root

Solution:

Elaticsearch cannot be started by root by default, so it will report Java.Lang.runtimeException: can not run elasticsearch as root.

There are two types of solutions:

1. Modify the elaticsearch configuration to allow the root user to start (not recommended)

#Add the parameter -Des.insecure.allow.root=true when executing elasticSearch, the complete command is as follows

./elasticsearch -Des.insecure.allow.root=true

#Or open the elasticsearch executable file with vi, and add the following command before the variable ES_JAVA_OPTS is used

ES_JAVA_OPTS="-Des.insecure.allow.root=true"

2. Create users for elaticsearch and grant corresponding permissions

adduser es

passwd es

chown -R es:es elasticsearch-6.3.2/

chmod 770 elasticsearch-6.3.2/