1,

Exception in thread "main" java.nio.file.AccessDeniedException: /usr/local/elasticserch/elasticsearch-6.4.022/config/jvm.options
這個問題引起的原因是：伺服器上實體記憶體太小，大部分都是應為程式太多，記憶體吃緊，而給jvm分配的記憶體太大(java程式啟動需要的記憶體，linux不能給)，最好調整java程式jvm記憶體吧(測試環境下)

修改jvm.options -Xms2g -Xmx2g改為1g

2,

elasticserch.yml修改為

bootstrap.memory_lock: false
bootstrap.system_call_filter: false

3，NoNodeAvailableException[None of the configured nodes are available: [{#transport#-1}{erxVApIpTVW0Crl-ngbvzg}{ip}{ip:9300}] ]

https://blog.csdn.net/yunfeishiye/article/details/51894513

https://blog.csdn.net/u013083576/article/details/78499884

https://blog.csdn.net/zhang89xiao/article/details/68925294