2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten] MongoDB starting : pid=2043 port=31250 dbpath=/home/vagrant/./M310-HW-2.5/r0 64-bit host=m040
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten] db version v4.0.0
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten] git version: 3b07af3d4f471ae89e8186d33bbb1d5259597d51
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.1f 6 Jan 2014
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten] allocator: tcmalloc
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten] modules: enterprise 
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten] build environment:
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten]     distmod: ubuntu1404
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten]     distarch: x86_64
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten]     target_arch: x86_64
2018-12-12T01:03:45.924+0000 I CONTROL  [initandlisten] options: { net: { port: 31250 }, processManagement: { fork: true }, replication: { replSet: "UNENCRYPTED" }, security: { enableEncryption: true, encryptionKeyFile: "./M310-HW-2.5/master_key" }, storage: { dbPath: "./M310-HW-2.5/r0" }, systemLog: { destination: "file", path: "./M310-HW-2.5/r0/mongo.log" } }
2018-12-12T01:03:45.943+0000 I STORAGE  [initandlisten] Detected data files in /home/vagrant/./M310-HW-2.5/r0 created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2018-12-12T01:03:45.943+0000 I STORAGE  [initandlisten] 
2018-12-12T01:03:45.944+0000 I STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2018-12-12T01:03:45.944+0000 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2018-12-12T01:03:45.944+0000 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=488M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),statistics_log=(wait=0),verbose=(recovery_progress),encryption=(name=AES256-CBC,keyid=".system"),extensions=[local={entry=mongo_addWiredTigerEncryptors,early_load=true},,],
2018-12-12T01:03:46.638+0000 E STORAGE  [initandlisten] Unable to retrieve key .system, error: Error reading file ./M310-HW-2.5/master_key: No such file or directory
2018-12-12T01:03:46.644+0000 E STORAGE  [initandlisten] Unable to retrieve key .system, error: Error reading file ./M310-HW-2.5/master_key: No such file or directory
2018-12-12T01:03:46.651+0000 E STORAGE  [initandlisten] Unable to retrieve key .system, error: Error reading file ./M310-HW-2.5/master_key: No such file or directory
2018-12-12T01:03:46.652+0000 F STORAGE  [initandlisten] Failed to start up WiredTiger under any compatibility version.
2018-12-12T01:03:46.652+0000 F -        [initandlisten] Fatal Assertion 28561 at src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp 190
2018-12-12T01:03:46.652+0000 F -        [initandlisten] 

***aborting after fassert() failure