添加官方yum源——mongodb3.4
vim /etc/yum.repos.d/mongodb-org-3.4.repo
[mongodb-org-3.4] name=MongoDB Repository baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.4/x86_64/ gpgcheck=1 enabled=1 gpgkey=https://www.mongodb.org/static/pgp/server-3.4.asc
yum install -y mongodb-org