在系统上安装mongodb之后报错。 
(安装教程地址: https://docs.mongodb.com/master/tutorial/install-mongodb-on-red-hat/)

错误信息: 
WARNING: /sys/kernel/mm/transparent_hugepage/enabled is ‘always’.We suggest setting it to ‘never’ 
WARNING: /sys/kernel/mm/transparent_hugepage/defrag is ‘always’.We suggest setting it to ‘never’ 
WARNING: soft rlimits too low. rlimits set to 1024 processes, 65535 files. Number of processes should be at least 32767.5 : 0.5 times number of files.

解决方案

前两个warning

sudo echo "never" > /sys/kernel/mm/transparent_hugepage/enabled
sudo echo "never" >  /sys/kernel/mm/transparent_hugepage/defrag

第三个warning

vim /etc/security/limits.conf
添加一下几行
mongod  soft  nofile  64000
mongod  hard  nofile  64000
mongod  soft  nproc  32000
mongod  hard  nproc  32000
 

重启mongod

sudo service mongod restart
 

成功

?  ~ git:(master) mongo
MongoDB shell version: 3.2.6
connecting to: test
>

MongoDB 启动后告警

原文：https://www.cnblogs.com/xibuhaohao/p/12577849.html