about to fork child process, waiting until server is ready for connections.
forked process: 6174
ERROR: child process failed, exited with error number 48
To see additional information in this output, start without the "--fork" option.
但其实 --fork并不能起作用
1.先清除data里的.lock文件
删除log里的config.log和configsvr.pid
2.修复模式启动
/www/server/mongodb/bin/mongod -f /www/server/mongodb/config.conf --repair （路径填写自己的mongodb所在地址）
得到提示：
about to fork child process, waiting until server is ready for connections.
forked process: 7701
child process started successfully, parent exiting
成功修复
mongodb的异常关闭都会导致锁死无法启动，推荐mongod --shutdown -f .地址/mongodb.conf
千万不要 kill -9 pid