MongDB启动警告WARNING:softrlimitstoolow

#mongo
MongoDB shell version: 3.0.2
connecting to: test
Server has startup warnings:
2015-03-09T12:34:19.688-0700 I CONTROL [initandlisten]
2015-03-09T12:34:19.688-0700 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 1024 processes, 64000 files. Number of processes should be at least 32000 : 0.5 times number of files.

>

root cause:mongodb当前限制：1024 processes, 64000 files

mongodb要求：processes = 0.5*files=32000
实际上产环境 processes =48000

所以需要将 processes 从1024 改为 48000 或更大. 

修改配置文件 /etc/security/limits.d/90-nproc.conf

# vi /etc/security/limits.d/90-nproc.conf

*          soft    nproc     1024
改为:
*          soft    nproc     48000
重启mongodb，异常消失