本文将介绍在Windows10上面安装 mongodb-3.4.15 绿色版本。个人并不是很喜欢采用exe/msi等方式去安装mongodb，除非没得选了。
（1）将下载的压缩包 mongodb-3.4.15.rar 解压到指定的目录。加压后的目录结构如下：
（2）在mongodb 目录下面创建一个data目录。如下：
（3）通过 binmongod.exe 命令启动 mongodb。如下：
mongod.exe --dbpath D:mongodb-3.4.15data
启动日志，如下：
2020-02-14T20:59:21.725+0800 I CONTROL [initandlisten] MongoDB starting : pid=15688 port=27017 dbpath=D:servermongodb-3.4.15\data 64-bit host=ZQCBUIB1T9KD4J6
2020-02-14T20:59:21.727+0800 I CONTROL [initandlisten] targetMinOS: Windows Vista/Windows Server 2008
2020-02-14T20:59:21.728+0800 I CONTROL [initandlisten] db version v3.4.15-52-g874aa31cae
2020-02-14T20:59:21.728+0800 I CONTROL [initandlisten] git version: 874aa31cae91abbfdd2cbe10810e9e8d7dd98f6d
2020-02-14T20:59:21.728+0800 I CONTROL [initandlisten] allocator: tcmalloc
2020-02-14T20:59:21.728+0800 I CONTROL [initandlisten] modules: none
2020-02-14T20:59:21.728+0800 I CONTROL [initandlisten] build environment:
2020-02-14T20:59:21.728+0800 I CONTROL [initandlisten] distarch: x86_64
2020-02-14T20:59:21.728+0800 I CONTROL [initandlisten] target_arch: x86_64
2020-02-14T20:59:21.729+0800 I CONTROL [initandlisten] options: { storage: { dbPath: "D:servermongodb-3.4.15\data" } }
2020-02-14T20:59:21.731+0800 I - [initandlisten] Detected data files in D:servermongodb-3.4.15\data created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2020-02-14T20:59:21.732+0800 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=7550M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),verbose=(recovery_progress),
2020-02-14T20:59:22.094+0800 I STORAGE [initandlisten] WiredTiger message [1581685162:93425][15688:140716502113872], txn-recover: Main recovery loop: starting at 17/23552
2020-02-14T20:59:22.307+0800 I STORAGE [initandlisten] WiredTiger message [1581685162:306305][15688:140716502113872], txn-recover: Recovering log 17 through 18
2020-02-14T20:59:22.426+0800 I STORAGE [initandlisten] WiredTiger message [1581685162:426233][15688:140716502113872], txn-recover: Recovering log 18 through 18
2020-02-14T20:59:22.600+0800 I CONTROL [initandlisten]
2020-02-14T20:59:22.600+0800 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
2020-02-14T20:59:22.600+0800 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
2020-02-14T20:59:22.600+0800 I CONTROL [initandlisten]
2020-02-14T20:59:24.069+0800 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory 'D:/server/mongodb-3.4.15//data/diagnostic.data'
2020-02-14T20:59:24.071+0800 I NETWORK [thread1] waiting for connections on port 27017看见上面最后 27027 了吗？这就是 mongodb 的端口。恭喜你，启动成功了！！
注意：上面启动的 mongodb 不需要用户名和密码都可以连接。如果你需要账号和密码验证，需要使用 --auth 选项开启权限验证。
执行下面命令，开启mongodb的权限认证。命令如下：
mongod.exe --dbpath D:mongodb-3.4.15data --auth
成功启动 mongodb 以后，使用 mongo.exe 连接 mongodb。过程如下：
D:mongodb-3.4.15in> mongo.exe
MongoDB shell version v3.4.15-52-g874aa31cae
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.15-52-g874aa31cae
> show dbs;
2020-02-14T21:15:57.823+0800 E QUERY [thread1] Error: listDatabases failed:{
"ok" : 0,
"errmsg" : "not authorized on admin to execute command { listDatabases: 1.0 }",
"code" : 13,
"codeName" : "Unauthorized"
} :
_getErrorWithCode@src/mongo/shell/utils.js:25:13
Mongo.prototype.getDBs@src/mongo/shell/mongo.js:62:1
shellHelper.show@src/mongo/shell/utils.js:788:19
shellHelper@src/mongo/shell/utils.js:678:15
@(shellhelp2):1:1
>使用 show dbs 查看数据库列表，但是报错了，因为没有权限（你没有登录）。
