当我启动mongo db时，它会立即崩溃并返回到正常的命令行.如果有帮助的话，我在Mac上运行MEAN stack.以下是错误:
$sudo mongod
Sun Jun 1 21:01:01.728 [initandlisten] MongoDB starting : pid=47937 port=3000 dbpath=/usr/local/var/mongodb 64-bit host=NoHax4You
Sun Jun 1 21:01:01.728 [initandlisten]
Sun Jun 1 21:01:01.729 [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
Sun Jun 1 21:01:01.729 [initandlisten] db version v2.4.9
Sun Jun 1 21:01:01.729 [initandlisten] git version: nogitversion
Sun Jun 1 21:01:01.729 [initandlisten] build info: Darwin minimavericks.local 13.0.0 Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49
Sun Jun 1 21:01:01.729 [initandlisten] allocator: tcmalloc
Sun Jun 1 21:01:01.729 [initandlisten] options: { bind_ip: "127.0.0.1", config: "/usr/local/etc/mongod.conf", dbpath: "/usr/local/var/mongodb", logappend: "true", logpath: "/usr/local/var/log/mongodb/mongo.log", port: 3000 }
Sun Jun 1 21:01:01.729 [initandlisten] exception in initAndListen: 10310 Unable to lock file: /usr/local/var/mongodb/mongod.lock. Is a mongod instance already running?, terminating
Sun Jun 1 21:01:01.729 dbexit:
Sun Jun 1 21:01:01.729 [initandlisten] shutdown: going to close listening sockets...
Sun Jun 1 21:01:01.729 [initandlisten] shutdown: going to flush diaglog...
Sun Jun 1 21:01:01.729 [initandlisten] shutdown: going to close sockets...
Sun Jun 1 21:01:01.729 [initandlisten] shutdown: waiting for fs preallocator...
Sun Jun 1 21:01:01.729 [initandlisten] shutdown: lock for final commit...
Sun Jun 1 21:01:01.729 [initandlisten] shutdown: final commit...
Sun Jun 1 21:01:01.729 [initandlisten] shutdown: closing all files...
Sun Jun 1 21:01:01.729 [initandlisten] closeAllFiles() finished
Sun Jun 1 21:01:01.729 dbexit: really exiting now
谢谢