MongoDB不是'；t从ubuntu 16.04开始

我在ubuntu 16.04上安装mongodb时使用了：

echo "deb http://repo.mongodb.org/apt/debian wheezy/mongodb-org/3.0 main" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.0.list
sudo apt-get update
sudo apt-get install -y mongodb-org

但我在尝试启动服务时出现以下错误：

**~$** systemctl start mongodb
Failed to start mongodb.service: Unit mongodb.service is masked.

**~$** systemctl start mongod
Failed to start mongod.service: Unit mongod.service not found.

**~$** sudo service mongod start
Failed to start mongod.service: Unit mongod.service not found.

**~$** mongod
mongod --help for help and startup options
2016-09-04T11:20:59.074+0200 [initandlisten] MongoDB starting : pid=30207 port=27017 dbpath=/data/db 64-bit host=zantes
2016-09-04T11:20:59.074+0200 [initandlisten] db version v2.6.10
2016-09-04T11:20:59.074+0200 [initandlisten] git version: nogitversion
2016-09-04T11:20:59.074+0200 [initandlisten] OpenSSL version: OpenSSL 1.0.2g-fips  1 Mar 2016
2016-09-04T11:20:59.074+0200 [initandlisten] build info: Linux lgw01-12 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 BOOST_LIB_VERSION=1_58
2016-09-04T11:20:59.074+0200 [initandlisten] allocator: tcmalloc
2016-09-04T11:20:59.074+0200 [initandlisten] options: {}
2016-09-04T11:20:59.074+0200 [initandlisten] exception in initAndListen: 10296 
*********************************************************************
 ERROR: dbpath (/data/db) does not exist.
 Create this directory or give existing directory in --dbpath.
 See http://dochub.mongodb.org/core/startingandstoppingmongo
*********************************************************************
, terminating
2016-09-04T11:20:59.074+0200 [initandlisten] dbexit: 
2016-09-04T11:20:59.074+0200 [initandlisten] shutdown: going to close listening sockets...
2016-09-04T11:20:59.074+0200 [initandlisten] shutdown: going to flush diaglog...
2016-09-04T11:20:59.074+0200 [initandlisten] shutdown: going to close sockets...
2016-09-04T11:20:59.074+0200 [initandlisten] shutdown: waiting for fs preallocator...
2016-09-04T11:20:59.074+0200 [initandlisten] shutdown: lock for final commit...
2016-09-04T11:20:59.074+0200 [initandlisten] shutdown: final commit...
2016-09-04T11:20:59.074+0200 [initandlisten] shutdown: closing all files...
2016-09-04T11:20:59.074+0200 [initandlisten] closeAllFiles() finished
2016-09-04T11:20:59.074+0200 [initandlisten] dbexit: really exiting now

但当我检查状态为活动时，请帮助我。我不知道我该怎么办

**~$** sudo systemctl status mongodb
**●** mongodb.service - An object/document-oriented database
   Loaded: loaded (/lib/systemd/system/mongodb.service; enabled; vendor prese
   Active: active (running) since dom 2016-09-04 11:01:11 CEST; 20min ago
     Docs: man:mongod(1)
 Main PID: 27544 (mongod)
   CGroup: /system.slice/mongodb.service
           └─27544 /usr/bin/mongod --config /etc/mongodb.conf

set 04 11:01:11 zantes systemd[1]: Started An object/document-oriented databa
lines 1-9/9 (END)

我以前在c9上工作过，但它有很多问题，而且速度很慢，我需要mongodb来处理我的项目

---

（对不起，我的英语不好）

在错误消息的某个地方，它说“dbpath（/data/db）不存在”。“/data/db”是mongodb存储其数据文件的默认目录。您必须手动创建它。这条路似乎不存在

---

如果要更改此路径，请将--dbpath参数传递给mongod，或者更改mongodb.conf文件中的dbpath参数值。

如果mongodbversion大于等于4并且安装在ubuntu中，请使用mongod而不是mongodb

sudo systemctl状态mongod sudo系统控制启动mongod sudo vi/etc/mongod.conf

否则，使用mongodb命令将出现以下错误

无法重新启动mongodb.service:单元mongodb.service被屏蔽