无法连接到 MongoDB errno:61

我使用 macports 安装了 MongoDB 并尝试运行mongo命令以启动 mongo shell。我收到以下错误：

warning: Failed to connect to 127.0.0.1:27017, reason: errno:61 Connection refused

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

然后我跑了mongod并收到以下错误：

$ [initandlisten] MongoDB starting : pid=11984 port=27017 dbpath=/data/db 64-bit host=Nikitas-MacBook-Air.local
$ [initandlisten] 
$ [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
$ [initandlisten] db version v2.6.0
$ [initandlisten] git version: nogitversion
$ [initandlisten] build info: Darwin tennine-slave.macports.org 13.1.0 Darwin Kernel Version 
13.1.0: Thu Jan 16 19:40:37 PST 2014; root:xnu-2422.90.20~2/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_55
$ [initandlisten] allocator: tcmalloc
$ [initandlisten] options: {}
$ [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
$ [initandlisten] dbexit: 
$ [initandlisten] shutdown: going to close listening sockets...
$ [initandlisten] shutdown: going to flush diaglog...
$ [initandlisten] shutdown: going to close sockets...
$ [initandlisten] shutdown: waiting for fs preallocator...
$ [initandlisten] shutdown: lock for final commit...
$ [initandlisten] shutdown: final commit...
$ [initandlisten] shutdown: closing all files...
$ [initandlisten] closeAllFiles() finished
$ [initandlisten] dbexit: really exiting now

我在哪里创建/data/db目录，根目录？第二个错误是否是原因errno:61当我跑步时mongo?

我遇到了类似的问题。我已经详细描述了错误跟踪和解决方案在这个博客上 http://www.alirazabhayani.com/2015/02/mongodb-correct-way-to-start-error-Cannot-connect-to-mongodb-errno-61-connection-refused.html这是我为解决此问题所做的逐步过程：

第 1 步 - 安装（如果您已经安装了 MongoDB，请不要执行此步骤）：

brew update
brew install mongodb

第 2 步 - 运行 Mongo 守护进程：

mkdir -p /data/db
sudo mongod

第 3 步 - 运行 Mongo Shell 界面：

mongo

按照这个顺序，我能够运行 mongo 命令，没有任何错误。