mongo 磁盤滿，導致mongo掛了，重啓報錯

 mongod --config /local/hadoop/var/lib/hdfs/data/mongodb/mongodb/conf/share1.conf
 mongod --config /local/hadoop/var/lib/hdfs/data/mongodb/mongodb/conf/share2.conf
 mongod --config /local/hadoop/var/lib/hdfs/data/mongodb/mongodb/conf/share3.conf
 執行以上報錯

about to fork child process, waiting until server is ready for connections.
forked process: 31571
ERROR: child process failed, exited with error number 51

方法：
 刪除 dbPath: /local/hadoop/var/lib/hdfs/data/mongodb/share3/data 目錄下面所有內容後重啓就可以

可是連接還是報錯：

mongodb Failed to execute "listdatabases" command.