vim /etc/yum.repos.d/mongodb-org-4.0.repo

配置mongo的yum源

[mongodb-org-4.0]  
name=MongoDB Repository  
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.0/x86_64/  
gpgcheck=1
enabled=1  
gpgkey=https://www.mongodb.org/static/pgp/server-4.0.asc


yum install mongodb-org