ubuntu 16.04 MongoDB 오류 - Error: couldn't connect to server 127.0.0.1:...

mongo 쉘 진입을 위해서 mongo 입력시 Error: couldn't connect to server 127.0.0.1 오류에 직면 했다.

$ mongo
MongoDB shell version v4.2.10
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
2020-10-23T16:57:38.500+0000 E  QUERY    [js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused :
connect@src/mongo/shell/mongo.js:353:17
@(connect):2:6
2020-10-23T16:57:38.501+0000 F  -        [main] exception: connect failed
2020-10-23T16:57:38.501+0000 E  -        [main] exiting with code 1

 사실 이 오류가 뜨는 이유는 다양해서 딱히 정해진 해결법이 하나 있다고는 할 수 없다. 그래서 mongod를 실행해서 확인 해봐야 한다.

$ mongod
2020-06-09T19:52:14.630+0000 I  CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
2020-06-09T19:52:14.632+0000 W  ASIO     [main] No TransportLayer configured during NetworkInterface startup
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten] MongoDB starting : pid=27618 port=27017 dbpath=/data/db 64-bit host=ip-*-*-*-*.eu-central-1.compute.internal
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten] db version v4.2.7
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten] git version: 51d9fe12b5d19720e72dcd7db0f2f17dd9a19212
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.1e-fips 11 Feb 2013
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten] allocator: tcmalloc
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten] modules: none
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten] build environment:
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten]     distmod: rhel70
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten]     distarch: x86_64
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten]     target_arch: x86_64
2020-06-09T19:52:14.632+0000 I  CONTROL  [initandlisten] options: { storage: { dbPath: "/data/db" } }
2020-06-09T19:52:14.633+0000 I  STORAGE  [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2020-06-09T19:52:14.633+0000 I  STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=256M,cache_overflow=(file_max=0M),session_max=33000,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,close_scan_interval=10,close_handle_minimum=250),statistics_log=(wait=0),verbose=[recovery_progress,checkpoint_progress],
2020-06-09T19:52:15.356+0000 I  STORAGE  [initandlisten] WiredTiger message [1591732335:356822][27618:0x7f9b34a81c40], txn-recover: Recovering log 6 through 7
2020-06-09T19:52:15.412+0000 I  STORAGE  [initandlisten] WiredTiger message [1591732335:412272][27618:0x7f9b34a81c40], txn-recover: Recovering log 7 through 7
2020-06-09T19:52:15.500+0000 I  STORAGE  [initandlisten] WiredTiger message [1591732335:500634][27618:0x7f9b34a81c40], txn-recover: Main recovery loop: starting at 6/22528 to 7/256
2020-06-09T19:52:15.609+0000 I  STORAGE  [initandlisten] WiredTiger message [1591732335:609015][27618:0x7f9b34a81c40], txn-recover: Recovering log 6 through 7
2020-06-09T19:52:15.672+0000 I  STORAGE  [initandlisten] WiredTiger message [1591732335:672877][27618:0x7f9b34a81c40], txn-recover: Recovering log 7 through 7
2020-06-09T19:52:15.727+0000 I  STORAGE  [initandlisten] WiredTiger message [1591732335:727038][27618:0x7f9b34a81c40], txn-recover: Set global recovery timestamp: (0, 0)
2020-06-09T19:52:15.735+0000 I  RECOVERY [initandlisten] WiredTiger recoveryTimestamp. Ts: Timestamp(0, 0)
2020-06-09T19:52:15.739+0000 I  STORAGE  [initandlisten] Timestamp monitor starting
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] 
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] 
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] ** WARNING: This server is bound to localhost.
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] **          Remote systems will be unable to connect to this server. 
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] **          Start the server with --bind_ip <address> to specify which IP 
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] **          addresses it should serve responses from, or with --bind_ip_all to
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] **          bind to all interfaces. If this behavior is desired, start the
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] **          server with --bind_ip 127.0.0.1 to disable this warning.
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] 
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] 
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] **        We suggest setting it to 'never'
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] 
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] **        We suggest setting it to 'never'
2020-06-09T19:52:15.741+0000 I  CONTROL  [initandlisten] 
2020-06-09T19:52:15.743+0000 I  SHARDING [initandlisten] Marking collection local.system.replset as collection version: <unsharded>
2020-06-09T19:52:15.744+0000 I  STORAGE  [initandlisten] Flow Control is enabled on this deployment.
2020-06-09T19:52:15.744+0000 I  SHARDING [initandlisten] Marking collection admin.system.roles as collection version: <unsharded>
2020-06-09T19:52:15.745+0000 I  SHARDING [initandlisten] Marking collection admin.system.version as collection version: <unsharded>
2020-06-09T19:52:15.746+0000 I  SHARDING [initandlisten] Marking collection local.startup_log as collection version: <unsharded>
2020-06-09T19:52:15.746+0000 I  FTDC     [initandlisten] Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data'
2020-06-09T19:52:15.748+0000 I  SHARDING [LogicalSessionCacheRefresh] Marking collection config.system.sessions as collection version: <unsharded>
2020-06-09T19:52:15.749+0000 I  SHARDING [LogicalSessionCacheReap] Marking collection config.transactions as collection version: <unsharded>
2020-06-09T19:52:15.749+0000 I  NETWORK  [listener] Listening on /tmp/mongodb-27017.sock
2020-06-09T19:52:15.749+0000 I  NETWORK  [listener] Listening on 127.0.0.1
2020-06-09T19:52:15.749+0000 I  NETWORK  [listener] waiting for connections on port 27017
2020-06-09T19:52:16.000+0000 I  SHARDING [ftdc] Marking collection local.oplog.rs as collection version: <unsharded>

저번에 겪었던 dbpath를 지정안해서 생긴 NonExistentPath: Data directory /data/db 오류는 아니였고 Marking collection local.oplog.rs as collection version: <unsharded>이 단계에서 더 이상 진행이 되지 않던 문제가 있었다.

일단 복구 실행옵션인 --repair를 실행시키고 재시작 이후 mongo를 다시 실행 시켜보았다.

$ mongod --repair
2020-10-23T17:24:42.552+0000 I  CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
2020-10-23T17:24:42.553+0000 W  ASIO     [main] No TransportLayer configured during NetworkInterface startup
2020-10-23T17:24:42.554+0000 I  CONTROL  [initandlisten] MongoDB starting : pid=15466 port=27017 dbpath=/data/db 64-bit host=sugimoto-1
2020-10-23T17:24:42.554+0000 I  CONTROL  [initandlisten] db version v4.2.10
...

$ service mongod restart
$ mongo
MongoDB shell version v4.2.10
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("51271f1b-ddc0-4774-9aed-c014ed2224ec") }
MongoDB server version: 4.2.10
Server has startup warnings: 
2020-10-23T17:50:41.720+0000 I  STORAGE  [initandlisten] 
2020-10-23T17:50:41.720+0000 I  STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2020-10-23T17:50:41.720+0000 I  STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2020-10-23T17:50:42.606+0000 I  CONTROL  [initandlisten] 
2020-10-23T17:50:42.606+0000 I  CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2020-10-23T17:50:42.606+0000 I  CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2020-10-23T17:50:42.606+0000 I  CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2020-10-23T17:50:42.607+0000 I  CONTROL  [initandlisten] 
2020-10-23T17:50:42.607+0000 I  CONTROL  [initandlisten] ** WARNING: This server is bound to localhost.
2020-10-23T17:50:42.607+0000 I  CONTROL  [initandlisten] **          Remote systems will be unable to connect to this server. 
2020-10-23T17:50:42.607+0000 I  CONTROL  [initandlisten] **          Start the server with --bind_ip <address> to specify which IP 
2020-10-23T17:50:42.607+0000 I  CONTROL  [initandlisten] **          addresses it should serve responses from, or with --bind_ip_all to
2020-10-23T17:50:42.607+0000 I  CONTROL  [initandlisten] **          bind to all interfaces. If this behavior is desired, start the
2020-10-23T17:50:42.607+0000 I  CONTROL  [initandlisten] **          server with --bind_ip 127.0.0.1 to disable this warning.
2020-10-23T17:50:42.607+0000 I  CONTROL  [initandlisten] 
---
Enable MongoDB's free cloud-based monitoring service, which will then receive and display
metrics about your deployment (disk utilization, CPU, operation statistics, etc).

The monitoring data will be available on a MongoDB website with a unique URL accessible to you
and anyone you share the URL with. MongoDB may use this information to make product
improvements and to suggest MongoDB products and deployment options to you.

To enable free monitoring, run the following command: db.enableFreeMonitoring()
To permanently disable this reminder, run the following command: db.disableFreeMonitoring()
---

> 

 

그러자 갑자기 잘 작동하는 mongo...

이 방식이 안된다면 mongod.lock을 수동으로 지우고 /etc/mongod.conf을 수정하는 방법을 선택해야 하는데 이 방식은 아래 링크로 가서 해결하면 된다. 일본어지만 그냥 대충 흐름만 보면 뭘 시키는지 알 수 있다. 정 안되면 번역기를...

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