从官网下载MongoDB最新版

wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel70-4.4.4.tgz

如果是选择其他版本，则在如下页面选择对应版本然后复制连接即可：
https://www.mongodb.com/try/download/community

上面的这个copy link 有时候不会显示出来，多刷新几次就好了

tar zxvf mongodb-linux-x86_64-rhel70-4.4.4.tgz -C /data/software/mongodb/
mv mongodb-linux-x86_64-rhel70-4.4.4 mongodb-4.4.4

# [cdh-test02 bigdata 18:21:38] [Wed Feb 24] /data/software/mongodb/mongodb-4.4.4/bin
$ ll
total 195604
-rwxr-xr-x 1 bigdata bigdata     7684 Feb 12 06:37 install_compass
-rwxr-xr-x 1 bigdata bigdata 53431320 Feb 12 06:27 mongo
-rwxr-xr-x 1 bigdata bigdata 82400432 Feb 12 06:28 mongod
-rwxr-xr-x 1 bigdata bigdata 64440352 Feb 12 06:17 mongos

创建数据及日志文件夹：

mkdir /data/software/mongodb/mongodb-4.4.4/data/
mkdir /data/software/mongodb/mongodb-4.4.4/log/

新建mongodb.conf文件：

vim mongodb.conf

# 数据库存放目录
dbpath=/data/software/mongodb/mongodb-4.4.4/data/
# 日志文件路径:
logpath=/data/software/mongodb/mongodb-4.4.4/log/mongodb.log
# 是否追加日志
logappend=true
# 端口
port=27017
# 是否后台程序启动
fork=true
# 是否启动授权认证
auth=true

添加环境变量

sudo vim /etc/profile

启动MongoDB：

mongod --config /data/software/mongodb/mongodb-4.4.4/bin/mongodb.conf

查看服务是否正常：

ps -ef | grep mongodb
bigdata  13674     1  3 18:27 ?        00:00:00 mongod --config /data/software/mongodb/mongodb-4.4.4/bin/mongodb.conf

启动命令行客户端：

$ mongo
MongoDB shell version v4.4.4
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("f374bb47-a958-43a4-89ec-96a537c77dfc") }
MongoDB server version: 4.4.4
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
	https://docs.mongodb.com/
Questions? Try the MongoDB Developer Community Forums
	https://community.mongodb.com
> show tables
Warning: unable to run listCollections, attempting to approximate collection names by parsing connectionStatus
> show dbs
> help
	db.help()                    help on db methods
	db.mycoll.help()             help on collection methods
	sh.help()                    sharding helpers
	rs.help()                    replica set helpers
	help admin                   administrative help
	help connect                 connecting to a db help
	help keys                    key shortcuts
	help misc                    misc things to know
	help mr                      mapreduce

	show dbs                     show database names
	show collections             show collections in current database
	show users                   show users in current database
	show profile                 show most recent system.profile entries with time >= 1ms
	show logs                    show the accessible logger names
	show log [name]              prints out the last segment of log in memory, 'global' is default
	use <db_name>                set current database
	db.mycoll.find()             list objects in collection mycoll
	db.mycoll.find( { a : 1 } )  list objects in mycoll where a == 1
	it                           result of the last line evaluated; use to further iterate
	DBQuery.shellBatchSize = x   set default number of items to display on shell
	exit                         quit the mongo shell
> show collections
Warning: unable to run listCollections, attempting to approximate collection names by parsing connectionStatus
> show dbs
> use test
switched to db test
> db
test
> exit
bye

开启用户名和密码认证

$ mongo
MongoDB shell version v4.4.4
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("495593ff-f8fb-4d6e-ae86-64d78b914800") }
MongoDB server version: 4.4.4
> use admin
switched to db admin

### 因为没有认证所以show users 会报错
> show users
uncaught exception: Error: not authorized on admin to execute command { usersInfo: 1.0, lsid: { id: UUID("495593ff-f8fb-4d6e-ae86-64d78b914800") }, $db: "admin" } :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
DB.prototype.getUsers@src/mongo/shell/db.js:1659:15
shellHelper.show@src/mongo/shell/utils.js:914:9
shellHelper@src/mongo/shell/utils.js:819:15
@(shellhelp2):1:1


## 创建一个用户名密码都为root的用户
> db.createUser({user:"root",pwd:"root",roles:["root"]})
Successfully added user: { "user" : "root", "roles" : [ "root" ] }
> show users
uncaught exception: Error: command usersInfo requires authentication :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
DB.prototype.getUsers@src/mongo/shell/db.js:1659:15
shellHelper.show@src/mongo/shell/utils.js:914:9
shellHelper@src/mongo/shell/utils.js:819:15
@(shellhelp2):1:1


### 用最新创建的用户名密码进行认证
> db.auth('root','root')
1
> show users
{
	"_id" : "admin.root",
	"userId" : UUID("2fa4d904-544e-4902-9104-91d091a8e736"),
	"user" : "root",
	"db" : "admin",
	"roles" : [
		{
			"role" : "root",
			"db" : "admin"
		}
	],
	"mechanisms" : [
		"SCRAM-SHA-1",
		"SCRAM-SHA-256"
	]
}