Install MongoDB on Centos 7

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#!/bin/bash
#######################
#mongodb简介
#mongodb是个非关系型数据库，但操作跟关系型数据最类似。mysql是关系型数据库
#mongodb是面向文档存储的非关系型数据库，数据以json的格式进行存储
#mongodb可用来永久存储，也可用来缓存数据
#mongodb提供副本集和分片集群功能，操作简单
#############################
if [ `whoami` != root ]
then
echo "Please login as root to continue :)"
exit 1
fi
if [ ! -d /home/tools/ ];then
mkdir -p /home/tools
else
rm -rf /home/tools && mkdir -p /home/tools
fi
#Prohibit memory giant pages
echo 'never' >/sys/kernel/mm/transparent_hugepage/enabled
echo 'never' >/sys/kernel/mm/transparent_hugepage/defrag
#Add commands to /etc/rc.local
chmod +x /etc/rc.d/rc.local
echo "echo 'never' >/sys/kernel/mm/transparent_hugepage/enabled" >>/etc/rc.local
echo "echo 'never' >/sys/kernel/mm/transparent_hugepage/defrag" >>/etc/rc.local
#Disable firewall and selinux
sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config
systemctl disable firewalld.service
#Setting Handles Number and Process
cat >> /etc/security/limits.conf  /data/mongodb/27017/mongodb.conf