【mongodb】mongodb碰到 Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed : c...

Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:237:13

初次使用mac装的mongodb 碰到了

Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:237:13

权限问题，解决办法

1.删除 /data/db下的  .lock 文件

2. sudo chown -R 用户名 /data/db