错误日志：
[2018-07-30T18:18:22,438][ERROR][o.e.b.Bootstrap ] [es-2] node validation exception
[2] bootstrap checks failed
[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[2018-07-30T18:18:22,443][INFO ][o.e.n.Node ] [es-2] stopping ...
[2018-07-30T18:18:22,471][INFO ][o.e.n.Node ] [es-2] stopped
[2018-07-30T18:18:22,472][INFO ][o.e.n.Node ] [es-2] closing ...
[2018-07-30T18:18:22,485][INFO ][o.e.n.Node ] [es-2] closed
原因：
文件句柄不足，设定虚拟内存不足
解决方法：
切换到root用户下
调整文件句柄数：
修改limits.conf文件，修改以下内容：vi /etc/security/limits.conf
soft nofile 65536
hard nofile 65536
soft nproc 10240
hard nproc 10240
调整虚拟内存权限：
临时生效：sysctl -w vm.max_map_count=262144
查看结果：sysctl -a|grep vm.max_map_count
永久生效：修改sysctl.conf文件，添加以下内容：vi /etc/sysctl.conf
vm.max_map_count=655360
使配置生效：sysctl -p
启动命令：
/home/jyapp/elasticsearch-6.3.2/bin/elasticsearch -d
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