about to fork child process, waiting until server is ready for connections.
forked process: 12233
ERROR: child process failed, exited with error number 51
To see additional information in this output, start without the "--fork" option.
解决办法：
1、删除MongoDb安装目录下的 mongod.lock 文件
2、修改mongodb.conf参数：fork=false
3、mongod -f xxx.conf --repair 修复
4、重启mongodb
注意：本文归作者所有，未经作者允许，不得转载
