about to fork child process, waiting until server is ready for connections.
forked process: 17607
ERROR: child process failed, exited with 1
To see additional information in this output, start without the "--fork" option.
删除mongodb 的db目录下的mongod.lock文件，重启mongodb即可。该文件会生成在日志文件下（跟bin目录同级），cd 日志文件后 rm指令删除mongod.lock文件