ulimit too many open files

1. 问题

(1)、max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
每个进程最大同时打开文件数太小，可通过下面2个命令查看当前数量
(2). max number of threads [3818] for user [es] is too low, increase to at least [4096]
　最大线程个数太低。修改配置文件/etc/security/limits.conf（和问题1是一个文件），增加配置

解决方案

修改文件/etc/security/limits.conf ，增加以下内容：

* soft nofile 65536
* hard nofile 65536
* soft nproc 131072
* hard nproc 131072

针对普通用户，还需要修改：/etc/security/limits.d/20-nproc.conf

*          soft    nproc     131072
root       soft    nproc     unlimited

2. 问题

（3）.max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

解决方案

修改文件vi /etc/sysctl.conf，增加以下内容：

vm.swappiness=0
vm.max_map_count=262144

执行以下命令生效：

sysctl -p