mongodを再起動できない

vagrant上のcentosにmongodbをインストールし、一度、起動し、ログインできたのですが、vagrant haltをして、再度vagrant upしたのち、動かそうとすると、

mongo

MongoDB shell version: 2.6.12
connecting to: test
2017-05-21T06:27:47.046+0000 warning: Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2017-05-21T06:27:47.046+0000 Error: couldn't connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed at src/mongo/shell/mongo.js:146
exception: connect failed

となってしまいました。

ためしたこと

mongod --dbpath=/var/db/mongodb --repair

php
12017-05-21T06:31:34.148+0000 [initandlisten] MongoDB starting : pid=12184 port=27017 dbpath=/var/db/mongodb 64-bit host=localhost.localdomain
22017-05-21T06:31:34.148+0000 [initandlisten] db version v2.6.12
32017-05-21T06:31:34.148+0000 [initandlisten] git version: d73c92b1c85703828b55c2916a5dd4ad46535f6a
42017-05-21T06:31:34.148+0000 [initandlisten] build info: Linux build5.ny.cbi.10gen.cc 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC 2014 x86_64 BOOST_LIB_VERSION=1_49
52017-05-21T06:31:34.148+0000 [initandlisten] allocator: tcmalloc
62017-05-21T06:31:34.148+0000 [initandlisten] options: { repair: true, storage: { dbPath: "/var/db/mongodb" } }
72017-05-21T06:31:34.148+0000 [initandlisten] exception in initAndListen: 10296
8*********************************************************************
9 ERROR: dbpath (/var/db/mongodb) does not exist.
10 Create this directory or give existing directory in --dbpath.
11 See http://dochub.mongodb.org/core/startingandstoppingmongo
12*********************************************************************
13, terminating
142017-05-21T06:31:34.148+0000 [initandlisten] dbexit:
152017-05-21T06:31:34.148+0000 [initandlisten] shutdown: going to close listening sockets...
162017-05-21T06:31:34.148+0000 [initandlisten] shutdown: going to flush diaglog...
172017-05-21T06:31:34.148+0000 [initandlisten] shutdown: going to close sockets...
182017-05-21T06:31:34.148+0000 [initandlisten] shutdown: waiting for fs preallocator...
192017-05-21T06:31:34.148+0000 [initandlisten] shutdown: closing all files...
202017-05-21T06:31:34.148+0000 [initandlisten] closeAllFiles() finished
212017-05-21T06:31:34.148+0000 [initandlisten] dbexit: really exiting now