CentOS7上elasticsearch5.0启动失败

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 failed
max 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

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解决办法：

问题1：

max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536]

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修改/etc/security/limits.conf文件，添加或修改如下行：

*        hard    nofile           65536
*        soft    nofile           65536

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问题2：

max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144]

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使用下面的方法临时使其生效

$ sudo sysctl -w vm.max_map_count=262144

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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