https://blog.csdn.net/cookzrk/article/details/80179006

转载：https://my.oschina.net/u/2510243/blog/810520

max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
max number of threads [1024] for user [hadoop] is too low, increase to at least [2048]
max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

解决方案：

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

切换到root用户

ulimit -Hn  查看硬限制

vim /etc/security/limits.conf

添加下面设置 hadoop是用户

hadoop soft nofile 65536
hadoop hard nofile 65536

退出用户重新登录，使配置生效

重新 ulimit -Hn  查看硬限制 会发现数值有4096改成65535

vim /etc/security/limits.d/90-nproc.conf

找到如下内容：

soft nproc 1024

修改为

soft nproc 2048

vi /etc/sysctl.conf

添加下面配置：

vm.max_map_count=655360

并执行命令：

sysctl -p