irb(main):005:0> c=Mongo::Client.new('mongodb://localhost:14440')
D, [2019-09-10T18:00:26.569990 #11418] DEBUG -- : MONGODB | EVENT: #<TopologyOpening topology=Unknown[]>
D, [2019-09-10T18:00:26.570088 #11418] DEBUG -- : MONGODB | Topology type 'unknown' initializing.
D, [2019-09-10T18:00:26.570307 #11418] DEBUG -- : MONGODB | EVENT: #<TopologyChanged prev=Unknown[] new=Unknown[localhost:14440]>
D, [2019-09-10T18:00:26.570364 #11418] DEBUG -- : MONGODB | Topology type 'Unknown' changed to type 'Unknown'.
D, [2019-09-10T18:00:26.570423 #11418] DEBUG -- : MONGODB | EVENT: #<ServerOpening address=localhost:14440 topology=Unknown[localhost:14440]>
D, [2019-09-10T18:00:26.570461 #11418] DEBUG -- : MONGODB | Server localhost:14440 initializing.
D, [2019-09-10T18:00:26.570670 #11418] DEBUG -- : MONGODB | Waiting for up to 30.00 seconds for servers to be scanned: #<Cluster topology=Unknown[localhost:14440] servers=[#<Server address=localhost:14440 UNKNOWN>]>
D, [2019-09-10T18:00:26.572375 #11418] DEBUG -- : MONGODB | EVENT: #<ServerDescriptionChanged address=localhost:14440 topology=Sharded[localhost:14440] prev=#<Mongo::Server:Description:0x47104320952560 config={} average_round_trip_time=> new=#<Mongo::Server:Description:0x47104320983280 config={"ismaster"=>true, "msg"=>"isdbgrid", "maxBsonObjectSize"=>16777216, "maxMessageSizeBytes"=>48000000, "maxWriteBatchSize"=>100000, "localTime"=>2019-09-10 22:00:26 UTC, "logicalSessionTimeoutMinutes"=>30, "connectionId"=>440, "maxWireVersion"=>8, "minWireVersion"=>0, "ok"=>1.0, "operationTime"=>#<BSON::Timestamp:0x000055aea8a3a640 @seconds=1568152819, @increment=1>, "$clusterTime"=>{"clusterTime"=>#<BSON::Timestamp:0x000055aea8a3a528 @seconds=1568152819, @increment=1>, "signature"=>{"hash"=><BSON::Binary:0x47104320983440 type=generic data=0x0000000000000000...>, "keyId"=>0}}} average_round_trip_time=0.0013202>>
D, [2019-09-10T18:00:26.572467 #11418] DEBUG -- : MONGODB | Server description for localhost:14440 changed from 'unknown' to 'sharded'.
D, [2019-09-10T18:00:26.572678 #11418] DEBUG -- : MONGODB | EVENT: #<TopologyChanged prev=Unknown[localhost:14440] new=Sharded[localhost:14440]>
D, [2019-09-10T18:00:26.572734 #11418] DEBUG -- : MONGODB | Topology type 'Unknown' changed to type 'Sharded'.
=> #<Mongo::Client:0x47104320945280 cluster=#<Cluster topology=Sharded[localhost:14440] servers=[#<Server address=localhost:14440 MONGOS pool=#<ConnectionPool size=0 (0-5) used=0 avail=0 pending=0>>]>>
irb(main):006:0> c.database.command(shutdown:1)
D, [2019-09-10T18:00:34.837993 #11418] DEBUG -- : MONGODB | EVENT: #<ServerDescriptionChanged address=localhost:14440 topology=Sharded[localhost:14440] prev=#<Mongo::Server:Description:0x47104320983280 config={"ismaster"=>true, "msg"=>"isdbgrid", "maxBsonObjectSize"=>16777216, "maxMessageSizeBytes"=>48000000, "maxWriteBatchSize"=>100000, "localTime"=>2019-09-10 22:00:26 UTC, "logicalSessionTimeoutMinutes"=>30, "connectionId"=>440, "maxWireVersion"=>8, "minWireVersion"=>0, "ok"=>1.0, "operationTime"=>#<BSON::Timestamp:0x000055aea8a3a640 @seconds=1568152819, @increment=1>, "$clusterTime"=>{"clusterTime"=>#<BSON::Timestamp:0x000055aea8a3a528 @seconds=1568152819, @increment=1>, "signature"=>{"hash"=><BSON::Binary:0x47104320983440 type=generic data=0x0000000000000000...>, "keyId"=>0}}} average_round_trip_time=0.0013202> new=#<Mongo::Server:Description:0x47104322779160 config={"ismaster"=>true, "msg"=>"isdbgrid", "maxBsonObjectSize"=>16777216, "maxMessageSizeBytes"=>48000000, "maxWriteBatchSize"=>100000, "localTime"=>2019-09-10 22:00:34 UTC, "logicalSessionTimeoutMinutes"=>30, "connectionId"=>442, "maxWireVersion"=>8, "minWireVersion"=>0, "ok"=>1.0, "operationTime"=>#<BSON::Timestamp:0x000055aea8da7378 @seconds=1568152829, @increment=1>, "$clusterTime"=>{"clusterTime"=>#<BSON::Timestamp:0x000055aea8da72b0 @seconds=1568152829, @increment=1>, "signature"=>{"hash"=><BSON::Binary:0x47104322779340 type=generic data=0x0000000000000000...>, "keyId"=>0}}} average_round_trip_time=0.0011546014000000002>>
D, [2019-09-10T18:00:34.838094 #11418] DEBUG -- : MONGODB | Server description for localhost:14440 changed from 'sharded' to 'sharded'.
D, [2019-09-10T18:00:34.838214 #11418] DEBUG -- : MONGODB | EVENT: #<TopologyChanged prev=Sharded[localhost:14440] new=Sharded[localhost:14440]>
D, [2019-09-10T18:00:34.838270 #11418] DEBUG -- : MONGODB | Topology type 'Sharded' changed to type 'Sharded'.
D, [2019-09-10T18:00:34.838772 #11418] DEBUG -- : MONGODB | localhost:14440 | admin.shutdown | STARTED | {"shutdown"=>1, "$readPreference"=>{"mode"=>"primary"}, "lsid"=>{"id"=><BSON::Binary:0x47104321170380 type=uuid data=0x6be50d4103ff4678...>}}
D, [2019-09-10T18:00:34.843124 #11418] DEBUG -- : MONGODB | localhost:14440 | admin.shutdown | FAILED | EOFError: end of file reached (for 127.0.0.1:14440 (no TLS)) | 0.004188575s
D, [2019-09-10T18:00:34.843558 #11418] DEBUG -- : MONGODB | EVENT: #<ServerDescriptionChanged address=localhost:14440 topology=Sharded[localhost:14440] prev=#<Mongo::Server:Description:0x47104322779160 config={"ismaster"=>true, "msg"=>"isdbgrid", "maxBsonObjectSize"=>16777216, "maxMessageSizeBytes"=>48000000, "maxWriteBatchSize"=>100000, "localTime"=>2019-09-10 22:00:34 UTC, "logicalSessionTimeoutMinutes"=>30, "connectionId"=>442, "maxWireVersion"=>8, "minWireVersion"=>0, "ok"=>1.0, "operationTime"=>#<BSON::Timestamp:0x000055aea8da7378 @seconds=1568152829, @increment=1>, "$clusterTime"=>{"clusterTime"=>#<BSON::Timestamp:0x000055aea8da72b0 @seconds=1568152829, @increment=1>, "signature"=>{"hash"=><BSON::Binary:0x47104322779340 type=generic data=0x0000000000000000...>, "keyId"=>0}}} average_round_trip_time=0.0011546014000000002> new=#<Mongo::Server:Description:0x47104318808220 config={} average_round_trip_time=>>
D, [2019-09-10T18:00:34.843638 #11418] DEBUG -- : MONGODB | Server description for localhost:14440 changed from 'sharded' to 'unknown'.
D, [2019-09-10T18:00:34.843731 #11418] DEBUG -- : MONGODB | EVENT: #<TopologyChanged prev=Sharded[localhost:14440] new=Sharded[localhost:14440]>
D, [2019-09-10T18:00:34.843785 #11418] DEBUG -- : MONGODB | Topology type 'Sharded' changed to type 'Sharded'.
W, [2019-09-10T18:00:35.343702 #11418]  WARN -- : Retrying ismaster in monitor for localhost:14440 due to: Mongo::Error::SocketError EOFError: end of file reached (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:35.343858 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::EPIPE: Broken pipe (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:35.845788 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:36.846947 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:37.847747 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:38.848913 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:39.850001 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))

D, [2019-09-10T18:00:40.851157 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))

D, [2019-09-10T18:00:41.852303 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:42.853460 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:43.853912 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:44.855154 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:45.855833 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:46.856873 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:47.857994 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:48.859111 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:49.859742 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:50.860881 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:51.862043 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:52.863131 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:53.864301 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:54.865402 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:55.866511 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:56.867669 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:57.868802 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:00:58.869896 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))

D, [2019-09-10T18:00:59.871016 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
























D, [2019-09-10T18:01:00.872141 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))






D, [2019-09-10T18:01:01.873277 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:01:02.874433 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
D, [2019-09-10T18:01:03.875597 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
Traceback (most recent call last):
       16: from /home/w/apps/ruby-driver/lib/mongo/operation/shared/response_handling.rb:87:in `add_server_diagnostics'
       15: from /home/w/apps/ruby-driver/lib/mongo/operation/shared/executable.rb:29:in `block (3 levels) in do_execute'
       14: from /home/w/apps/ruby-driver/lib/mongo/operation/shared/executable.rb:50:in `get_result'
       13: from /home/w/apps/ruby-driver/lib/mongo/operation/shared/executable.rb:55:in `dispatch_message'
       12: from /home/w/apps/ruby-driver/lib/mongo/server.rb:416:in `with_connection'
       11: from /home/w/apps/ruby-driver/lib/mongo/server/connection_pool.rb:559:in `with_connection'
       10: from /home/w/apps/ruby-driver/lib/mongo/operation/shared/executable.rb:56:in `block in dispatch_message'
        9: from /home/w/apps/ruby-driver/lib/mongo/server/connection_base.rb:90:in `dispatch'
        8: from /home/w/apps/ruby-driver/lib/mongo/server/connection.rb:383:in `deliver'
        7: from /home/w/apps/ruby-driver/lib/mongo/server/connection_base.rb:97:in `deliver'
        6: from /home/w/apps/ruby-driver/lib/mongo/server/connectable.rb:83:in `ensure_connected'
        5: from /home/w/apps/ruby-driver/lib/mongo/server/connection_base.rb:105:in `block in deliver'
        4: from /home/w/apps/ruby-driver/lib/mongo/protocol/message.rb:139:in `deserialize'
D, [2019-09-10T18:01:04.846232 #11418] DEBUG -- : MONGODB | Error running ismaster on localhost:14440: Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:14440 (for 127.0.0.1:14440 (no TLS))
        3: from /home/w/apps/ruby-driver/lib/mongo/socket.rb:127:in `read'
        2: from /home/w/apps/ruby-driver/lib/mongo/socket.rb:313:in `handle_errors'
        1: from /home/w/apps/ruby-driver/lib/mongo/socket.rb:319:in `rescue in handle_errors'
Mongo::Error::SocketError (EOFError: end of file reached (for 127.0.0.1:14440 (no TLS)) (on localhost:14440, attempt 1, later retry failed: Mongo::Error::NoServerAvailable: No primary server is available in cluster: #<Cluster topology=Sharded[localhost:14440] servers=[#<Server address=localhost:14440 UNKNOWN pool=#<ConnectionPool size=0 (0-5) used=0 avail=0 pending=0>>]> with timeout=30, LT=0.015))
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