MongoDB启动报错 51

• 问题：启动MongoDB时提示number 51报错

• ./mongodb.sh start
  
  about to fork child process, waiting until server is ready for connections.
  forked process: 13206
  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：

        找到MongoDB安装目录下data目录中的mongod.lock文件，并删除mongod.lock

rm -rf  **/data/mongod.lock

        进入bin目录 修复etc下mongodb.conf 

mongod -f **/etc/mongodb.conf -repair

        再次启动MongoDB，成功解决！

./mongodb.sh start

about to fork child process, waiting until server is ready for connections.
forked process: 13368
child process started successfully, parent exiting