mongodb启动不了：child process failed, exited with error number 100

今天在启动mongodb的时候，发现起不来，报错：child process failed, exited with error number 100然后先去/var/log/mongo/mongod.log 查看启动的日志,发现： ************** Unclean shutdown detected. Please visit http://dochub.mongodb.org/co

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