配置下载源：
# vim /etc/yum.repos.d/mongodb-org-4.2.repo
配置内容：
[mongodb-org-4.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.2.asc
安装：
# yum install -y mongodb-org
安装过程：
# yum install -y mongodb-org
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* epel: mirror01.idc.hinet.net
* extras: mirrors.aliyun.com
* nux-dextop: mirror.li.nux.ro
* updates: mirrors.163.com
mongodb-org-4.2 | 2.4 kB 00:00:00
mongodb-org-4.2/7/primary_db | 8.7 kB 00:00:00
Resolving Dependencies
--> Running transaction check
---> Package mongodb-org.x86_64 0:4.2.0-1.el7 will be installed
--> Processing Dependency: mongodb-org-tools = 4.2.0 for package: mongodb-org-4.2.0-1.el7.x86_64
--> Processing Dependency: mongodb-org-shell = 4.2.0 for package: mongodb-org-4.2.0-1.el7.x86_64
--> Processing Dependency: mongodb-org-server = 4.2.0 for package: mongodb-org-4.2.0-1.el7.x86_64
--> Processing Dependency: mongodb-org-mongos = 4.2.0 for package: mongodb-org-4.2.0-1.el7.x86_64
--> Running transaction check
---> Package mongodb-org-mongos.x86_64 0:4.2.0-1.el7 will be installed
---> Package mongodb-org-server.x86_64 0:4.2.0-1.el7 will be installed
---> Package mongodb-org-shell.x86_64 0:4.2.0-1.el7 will be installed
---> Package mongodb-org-tools.x86_64 0:4.2.0-1.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===================================================================================================================================================================================================================
Package Arch Version Repository Size
===================================================================================================================================================================================================================
Installing:
mongodb-org x86_64 4.2.0-1.el7 mongodb-org-4.2 5.8 k
Installing for dependencies:
mongodb-org-mongos x86_64 4.2.0-1.el7 mongodb-org-4.2 14 M
mongodb-org-server x86_64 4.2.0-1.el7 mongodb-org-4.2 25 M
mongodb-org-shell x86_64 4.2.0-1.el7 mongodb-org-4.2 17 M
mongodb-org-tools x86_64 4.2.0-1.el7 mongodb-org-4.2 46 M
Transaction Summary
===================================================================================================================================================================================================================
Install 1 Package (+4 Dependent packages)
Total download size: 102 M
Installed size: 258 M
Downloading packages:
warning: /var/cache/yum/x86_64/7/mongodb-org-4.2/packages/mongodb-org-4.2.0-1.el7.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID 058f8b6b: NOKEY ] 0.0 B/s | 0 B --:--:-- ETA
Public key for mongodb-org-4.2.0-1.el7.x86_64.rpm is not installed
(1/5): mongodb-org-4.2.0-1.el7.x86_64.rpm | 5.8 kB 00:00:01
(2/5): mongodb-org-mongos-4.2.0-1.el7.x86_64.rpm | 14 MB 00:00:10
(3/5): mongodb-org-shell-4.2.0-1.el7.x86_64.rpm | 17 MB 00:00:08
(4/5): mongodb-org-server-4.2.0-1.el7.x86_64.rpm | 25 MB 00:00:21
(5/5): mongodb-org-tools-4.2.0-1.el7.x86_64.rpm | 46 MB 00:00:16
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 2.8 MB/s | 102 MB 00:00:35
Retrieving key from https://www.mongodb.org/static/pgp/server-4.2.asc
Importing GPG key 0x058F8B6B:
Userid : "MongoDB 4.2 Release Signing Key <[email protected]>"
Fingerprint: e162 f504 a20c df15 827f 718d 4b7c 549a 058f 8b6b
From : https://www.mongodb.org/static/pgp/server-4.2.asc
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : mongodb-org-mongos-4.2.0-1.el7.x86_64 1/5
Installing : mongodb-org-tools-4.2.0-1.el7.x86_64 2/5
Installing : mongodb-org-shell-4.2.0-1.el7.x86_64 3/5
Installing : mongodb-org-server-4.2.0-1.el7.x86_64 4/5
Created symlink from /etc/systemd/system/multi-user.target.wants/mongod.service to /usr/lib/systemd/system/mongod.service.
Installing : mongodb-org-4.2.0-1.el7.x86_64 5/5
Verifying : mongodb-org-server-4.2.0-1.el7.x86_64 1/5
Verifying : mongodb-org-4.2.0-1.el7.x86_64 2/5
Verifying : mongodb-org-shell-4.2.0-1.el7.x86_64 3/5
Verifying : mongodb-org-tools-4.2.0-1.el7.x86_64 4/5
Verifying : mongodb-org-mongos-4.2.0-1.el7.x86_64 5/5
Installed:
mongodb-org.x86_64 0:4.2.0-1.el7
Dependency Installed:
mongodb-org-mongos.x86_64 0:4.2.0-1.el7 mongodb-org-server.x86_64 0:4.2.0-1.el7 mongodb-org-shell.x86_64 0:4.2.0-1.el7 mongodb-org-tools.x86_64 0:4.2.0-1.el7
Complete!
启动：
# systemctl start mongod
进入命令行：
# mongo