and this is mongod logs
root@ip-172-31-3-183:/var/log/mongodb# nano mongod.log
GNU nano 2.5.3 File: mongod.log
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] MongoDB starting : pid=11631 port=27017 dbpath=/var/lib/mongodb 64-bit host=ip-172-31-3-183
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] db version v3.4.24
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] git version: 865b4f6a96d0f5425e39a18337105f33e8db504d
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2g 1 Mar 2016
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] allocator: tcmalloc
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] modules: none
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] build environment:
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] distmod: ubuntu1604
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] distarch: x86_64
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] target_arch: x86_64
2020-04-10T13:31:20.828+0000 I CONTROL [initandlisten] options: { config: "/etc/mongod.conf", net: { bindIp: "127.0.0.1", port: 27017 }, storage: { dbPath: "/var/lib/mongodb", journal: { enabled:$
2020-04-10T13:31:20.852+0000 I - [initandlisten] Detected data files in /var/lib/mongodb created by the 'mmapv1' storage engine, so setting the active storage engine to 'mmapv1'.
2020-04-10T13:31:20.863+0000 I JOURNAL [initandlisten] journal dir=/var/lib/mongodb/journal
2020-04-10T13:31:20.863+0000 I JOURNAL [initandlisten] recover : no journal files present, no recovery needed
2020-04-10T13:31:20.869+0000 I JOURNAL [durability] Durability thread started
2020-04-10T13:31:20.869+0000 I JOURNAL [journal writer] Journal writer thread started
2020-04-10T13:31:20.871+0000 I CONTROL [initandlisten]
2020-04-10T13:31:20.871+0000 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
2020-04-10T13:31:20.871+0000 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
2020-04-10T13:31:20.871+0000 I CONTROL [initandlisten]
2020-04-10T13:31:20.871+0000 I CONTROL [initandlisten]
2020-04-10T13:31:20.871+0000 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2020-04-10T13:31:20.871+0000 I CONTROL [initandlisten] ** We suggest setting it to 'never'
2020-04-10T13:31:20.871+0000 I CONTROL [initandlisten]
2020-04-10T13:31:21.080+0000 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory '/var/lib/mongodb/diagnostic.data'
2020-04-10T13:31:21.081+0000 I NETWORK [thread1] waiting for connections on port 27017
2020-04-10T13:31:21.945+0000 I NETWORK [thread1] connection accepted from 127.0.0.1:50858 #1 (1 connection now open)
2020-04-10T13:31:21.953+0000 I NETWORK [thread1] connection accepted from 127.0.0.1:50860 #2 (2 connections now open)
2020-04-10T13:31:21.954+0000 I NETWORK [thread1] connection accepted from 127.0.0.1:50862 #3 (3 connections now open)
2020-04-10T13:31:21.957+0000 I NETWORK [thread1] connection accepted from 127.0.0.1:50864 #4 (4 connections now open)
2020-04-10T13:31:22.018+0000 I NETWORK [thread1] connection accepted from 127.0.0.1:50866 #5 (5 connections now open)
2020-04-10T13:33:00.493+0000 I COMMAND [conn4] query rocketchat.rocketchat_message query: { orderby: { ts: -1 }, $query: { ts: { $exists: 1 } } } planSummary: IXSCAN { ts: 1 } ntoreturn:1 ntoskip$
2020-04-10T13:34:03.306+0000 I CONTROL [signalProcessingThread] got signal 15 (Terminated), will terminate after current cmd ends
2020-04-10T13:34:03.306+0000 I NETWORK [signalProcessingThread] shutdown: going to close listening sockets...
2020-04-10T13:34:03.306+0000 I NETWORK [signalProcessingThread] closing listening socket: 8
2020-04-10T13:34:03.306+0000 I NETWORK [signalProcessingThread] closing listening socket: 9
2020-04-10T13:34:03.306+0000 I NETWORK [signalProcessingThread] removing socket file: /tmp/mongodb-27017.sock
2020-04-10T13:34:03.306+0000 I NETWORK [signalProcessingThread] shutdown: going to flush diaglog...
2020-04-10T13:34:03.306+0000 I FTDC [signalProcessingThread] Shutting down full-time diagnostic data capture
2020-04-10T13:34:03.308+0000 I STORAGE [signalProcessingThread] shutdown: waiting for fs preallocator...
2020-04-10T13:34:03.308+0000 I STORAGE [signalProcessingThread] shutdown: final commit...
2020-04-10T13:34:03.308+0000 I JOURNAL [signalProcessingThread] journalCleanup...
2020-04-10T13:34:03.308+0000 I JOURNAL [signalProcessingThread] removeJournalFiles
2020-04-10T13:34:03.314+0000 I JOURNAL [signalProcessingThread] old journal file /var/lib/mongodb/journal/j._0 will be reused as /var/lib/mongodb/journal/prealloc.0
2020-04-10T13:34:03.321+0000 I JOURNAL [signalProcessingThread] Terminating durability thread ...
2020-04-10T13:34:03.412+0000 I JOURNAL [journal writer] Journal writer thread stopped
2020-04-10T13:34:03.413+0000 I JOURNAL [durability] Durability thread stopped
