Mongodb start Error: "/sys/kernel/mm/transparent_hugepage/enabled is ' always '"

System Environment

Distributor Id:centos
Description:    CentOS Release 6.7 (Final)
release:    6.7
codename:   Final

Problem Description

Error after installing MongoDB on the system.
(Installation Tutorial Address: https://docs.mongodb.com/master/tutorial/install-mongodb-on-red-hat/)

Error message:
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 1024x768 processes, 65535 files. Number of processes should is at least 32767.5:0.5 times number of files.
As shown in figure:
Solution Solutions first two warning

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

a third warning

Vim/etc/security/limits.conf
Add a few lines
mongod  soft  nofile  64000
mongod  Hard Nofile  64000
mongod  soft  nproc  32000
mongod  hard  nproc  32000

Restart Mongod

sudo service mongod restart

Success

After the restart success, all the errors are gone, as follows

➜  ~ git: (master) MONGO
MongoDB shell version:3.2.6
connecting to:test
>