mongo ERROR: child process failed, exited with error number 1

about to fork child process, waiting until server is ready for connections.
forked process: 86998
ERROR: child process failed, exited with error number 1
查看配置文件：
#开启认证
auth=true
#keyFile path
keyFile=/data/mongo/conf/keyFile
ll /data/mongo/conf/keyFile
chmod 600 /data/mongo/conf/keyFile