线上一台mongoDB意外关闭，重启的时候报错：
old lock file: /duitang/dist/sys/mongodb/mydb/mongod.lock. probably means unclean shutdown,
but there are no journal files to recover.
this is likely human error or filesystem corruption.
found 17 dbs.
see: http://dochub.mongodb.org/core/repair for more information
需要删掉/duitang/dist/sys/mongodb/mydb/mongod.lock, 并通过/duitang/dist/sys/mongodb/bin/mongod --repair 然后启动。
重启：numactl --interleave=all /duitang/dist/sys/mongodb/bin/mongod -f /duitang/dist/conf/mongodb/mongodb.conf