今天刚刚开机，启动服务后发现数据库无法访问27017端口，于是就尝试 ./mongo 发现抛出异常：
qianjiahaodeMacBook-Pro:bin qianjiahao$ ./mongo MongoDB shell version: 3.0.0 connecting to: test 2015-03-15T10:38:16.504+0800 W NETWORK Failed to connect to 127.0.0.1:27017, reason: errno:61 Connection refused 2015-03-15T10:38:16.505+0800 E QUERY Error: couldn’t connect to server 127.0.0.1:27017 (127.0.0.1), connection attempt failed at connect (src/mongo/shell/mongo.js:179:14) at (connect):1:6 at src/mongo/shell/mongo.js:179 exception: connect failed
于是又尝试 ./mongod 发现提示中有这一句：
2015-03-15T10:49:24.602+0800 I STORAGE [initandlisten] exception in initAndListen: 98 Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied Is a mongod instance already running?, terminating
我就按网上说的 删除了/data/db/mongod.lock文件，但是发现还是没有效果，输入./mongod依然提示 上面写道的错误。
2015-03-15T10:49:24.602+0800 I STORAGE [initandlisten] exception in initAndListen: 98 Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied Is a mongod instance already running?, terminating
后来我天真的删除了mongdb的文件和data/db里的文件，在重新下载后，配置了data/db ，结果发现错误依然存在，小弟新人，希望大家帮帮忙，望解决，谢谢
qianjiahaodeMacBook-Pro:~ qianjiahao$ cd mongodb/ qianjiahaodeMacBook-Pro:mongodb qianjiahao$ ls GNU-AGPL-3.0 THIRD-PARTY-NOTICES README bin qianjiahaodeMacBook-Pro:mongodb qianjiahao$ cd bin qianjiahaodeMacBook-Pro:bin qianjiahao$ ls bsondump mongodump mongoimport mongorestore mongostat mongo mongoexport mongooplog mongos mongotop mongod mongofiles mongoperf mongosniff qianjiahaodeMacBook-Pro:bin qianjiahao$ sudo mongod Password: sudo: mongod: command not found qianjiahaodeMacBook-Pro:bin qianjiahao$
在进入bin后 提示命令无法找到
