配置文件的格式变了
是这样子的啦：
systemLog:
destination: file
path: "/var/log/mongodb/mongodb.log"
logAppend: true
storage:
journal:
enabled: trueprocessManagement:
fork: true
net:
bindIp: 127.0.0.1
port: 27017
setParameter:
enableLocalhostAuthBypass: false
...
如果想要添加其他参数，请到这里查看吧：http://docs.mongodb.org/manual/reference/configuration-options/