Cliでmongodコマンドを実行すると、MongoDBに接続できません。

Centos VMにmongoDbをインストールしようとしており、次のWebサイトに従いました。 https://linuxize.com/post/how-to-install-mongodb-on-centos-7/、https://www.digitalocean.com/community/tutorials/how-to-install-mongodb-on-centos-7 ただし、Cliでmongodコマンドを実行すると、MongoDBに接続/入力できません。誰でもこれについてどんな考えを持っていますか？よろしくお願いします。

出力mongod：

-460f-4bb5-a5d7-0bbe48f3246a") }
2019-08-26T15:21:13.417+0530 I  INDEX    [initandlisten] index build: done building index _id_ on ns admin.system.version
2019-08-26T15:21:13.417+0530 I  SHARDING [initandlisten] Marking collection admin.system.version as collection version: <unsharded>
2019-08-26T15:21:13.417+0530 I  COMMAND  [initandlisten] setting featureCompatibilityVersion to 4.2
2019-08-26T15:21:13.421+0530 I  SHARDING [initandlisten] Marking collection local.system.replset as collection version: <unsharded>
2019-08-26T15:21:13.421+0530 I  STORAGE  [initandlisten] Flow Control is enabled on this deployment.
2019-08-26T15:21:13.422+0530 I  SHARDING [initandlisten] Marking collection admin.system.roles as collection version: <unsharded>
2019-08-26T15:21:13.422+0530 I  STORAGE  [initandlisten] createCollection: local.startup_log with generated UUID: 660f8f2a-c6d0-4a0c-a4bb-0f975d1f207e and options: { c485760 }

2019-08-26T15:21:13.426+0530 I  INDEX    [initandlisten] index build: done building index _id_ on ns local.startup_log
2019-08-26T15:21:13.427+0530 I  SHARDING [initandlisten] Marking collection local.startup_log as collection version: <unsharded>
2019-08-26T15:21:13.427+0530 I  FTDC     [initandlisten] Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data'
2019-08-26T15:21:13.428+0530 I  SHARDING [LogicalSessionCacheRefresh] Marking collection config.system.sessions as collection version: <unsharded>
2019-08-26T15:21:13.428+0530 I  NETWORK  [initandlisten] Listening on /tmp/mongodb-27017.sock
2019-08-26T15:21:13.428+0530 I  NETWORK  [initandlisten] Listening on 127.0.0.1
2019-08-26T15:21:13.428+0530 I  NETWORK  [initandlisten] waiting for connections on port 27017
2019-08-26T15:21:13.428+0530 I  CONTROL  [LogicalSessionCacheReap] Sessions collection is not set up; waiting until next sessions reap interval: config.system.sessions
2019-08-26T15:21:13.429+0530 I  STORAGE  [LogicalSessionCacheRefresh] createCollection: config.system.sessions with provided UUID: 45ed25cc-1dbb-4f38-8333-cf36ae8bd473 UUID("45ed25cc-1dbb-4f38-8333-cf36ae8bd473") }
2019-08-26T15:21:13.433+0530 I  INDEX    [LogicalSessionCacheRefresh] index build: done building index _id_ on ns config.system.sessions
2019-08-26T15:21:13.438+0530 I  INDEX    [LogicalSessionCacheRefresh] index build: starting on config.system.sessions properties: { v: 2, key: { lastUse: 1 }, name: "lnfig.system.sessions", expireAfterSeconds: 1800 } using method: Hybrid
2019-08-26T15:21:13.439+0530 I  INDEX    [LogicalSessionCacheRefresh] build may temporarily use up to 500 megabytes of RAM
2019-08-26T15:21:13.439+0530 I  INDEX    [LogicalSessionCacheRefresh] index build: collection scan done. scanned 0 total records in 0 seconds
2019-08-26T15:21:13.439+0530 I  INDEX    [LogicalSessionCacheRefresh] index build: inserted 0 keys from external sorter into index in 0 seconds
2019-08-26T15:21:13.440+0530 I  INDEX    [LogicalSessionCacheRefresh] index build: done building index lsidTTLIndex on ns config.system.sessions
2019-08-26T15:26:13.428+0530 I  SHARDING [LogicalSessionCacheReap] Marking collection config.transactions as collection version: <unsharded>