Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused（MongoDB启动异常）

mongdb启动异常：

Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused

1、若数据库出现如上不能连接的原因，可能是data目录下的mongod.lock文件问题，可以用如下命令修复：

[root@localhost ~]# cd /usr/local/mongodb/

[root@localhost mongodb]# ./bin/mongod --repair

2015-09-01T18:25:40.659+0800 I STORAGE  [initandlisten] exception in initAndListen: 29 Data directory /data/db not found., terminating

或者直接删除mongod.lock。

[root@localhost mongodb]# rm -f /usr/local/mongodb/data/db/mongod.lock

然后再重新启动MONGODB

[root@localhost ~]# mongod -f /etc/monogdb.conf

note: noprealloc may hurt performance in many applications

about to fork child process, waiting until server is ready for connections.

forked process: 4935

child process started successfully, parent exiting