提供一個思路。
Elasticsearch啓動不了
Nov 04 15:45:10 appserver01 elasticsearch[25283]: Invalid -Xlog option '-Xlog:gc*,gc+age=trace,safepoint:file=/var/log/elasticsearch/gc.log:utctime,pid,tags:filecount=32,filesize=64m', see error log for details.
Nov 04 15:45:10 appserver01 elasticsearch[25283]: Error: Could not create the Java Virtual Machine.
Nov 04 15:45:10 appserver01 elasticsearch[25283]: Error: A fatal exception has occurred. Program will exit.
去看log發現整個folder都不見了（被刪了）。
重建，grant right to elasticsearch就OK了。
/var/log/elasticsearch