CentOS7上elasticsearch5.0启动失败 问题描述：
最新版本5.0release了，想着装上试试，结果一上来就报了两个错，然后就退出了，如下：
$ ./elasticsearch...ERROR: bootstrap checks failedmax file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144][2016-10-31T04:55:45,240][INFO ][o.e.n.Node ] [vJDcSkt] stopping ...[2016-10-31T04:55:45,249][INFO ][o.e.n.Node ] [vJDcSkt] stopped[2016-10-31T04:55:45,249][INFO ][o.e.n.Node ] [vJDcSkt] closing ...[2016-10-31T04:55:45,257][INFO ][o.e.n.Node ] [vJDcSkt] closed 解决办法： 问题1： max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]
修改/etc/security/limits.conf文件，添加或修改如下行：
- hard nofile 65536* soft nofile 65536 问题2： max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]
使用下面的方法临时使其生效
$ sudo sysctl -w vm.max_map_count=262144
或者修改 /etc/sysctl.conf 文件，添加 “vm.max_map_count”设置
设置后，可以使用
$ sysctl -a