This question is in reference to Atlassian Documentation: Installing Confluence on Linux
After a vanilla install as root, the catalina.out log says:
09-Aug-2016 00:54:06.754 SEVERE [Standalone-startStop-1] org.apache.catalina.startup.HostConfig.beforeStart Unable to create directory for deployment: /opt/atlassian/confluence/conf/Standalone/localhost
Pretty terrible "out of the box" experience.