I'm deploying ElasticSearch inside of a Docker container, which usually run processes as root user. I get "org.elasticsearch.bootstrap.StartupError: java.lang.RuntimeException: can not run elasticsearch as root" error when trying to start ElasticSearch, and there doesn't seem to be a way to get arou…

Why is it ElasticSearch is not allowed to run as root

jprante (Jörg Prante) September 13, 2016, 9:52pm 4

This is wrong. Running root processes in Docker are far from safe. If the container is compromised, the root user can do anything, because root in the container is also root on the host. This is the reason why Docker 1.10 introduced user namespaces https://success.docker.com/Datacenter/Apply/Introduction_to_User_Namespaces_in_Docker_Engine

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