max file descriptors [4096] for elasticsearch process is too low

elasticsearch常见错误汇总

运行elasticsearch一种是 root用户按照官方文档通过rpm安装之后直接可以启动服务。

service elasticsearch start

另一种是在elasticsearch安装目录下直接运行，但是会报错：

[[email protected] elasticsearch]# ./bin/elasticsearch

uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root

解决办法是新建一个用户然后再去启动elasticsearch，记得先给这个用户elasticsearch权限。

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node validation exception
[1] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]

解决方法：

root用户编辑limits.conf

vim /etc/security/limits.conf

最后一行加上

*               soft    nofile          65536
*               hard    nofile          65536

保存，然后重新登录后再次启动elasticsearch即可！