MongoDB exception: connect failed

When tried to connect to MongoDB server, recieved the error: “MongoDB exception: connect failed”. This error occurs if MongoDB server is offline or It may be connecting with default port 27017.

MongoDB shell version v4.0.10
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
2019-07-09T22:18:34.660-0700 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:344:17
@(connect):2:6
exception: connect failed

Reason:

Possible reason check the MongoDB server is up and running fine or not. In my case this error came because MongoDB server is down.

Solution 1:

1. Lets verify the MongoDB server status:

service mongod status

● mongod.service - MongoDB Database Server
   Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset:
   Active: inactive (dead)
     Docs: https://docs.mongodb.org/manual

Jul 09 22:23:32 ubuntu systemd[1]: /lib/systemd/system/mongod.service:10: PIDFil
Jul 09 22:24:44 ubuntu systemd[1]: /lib/systemd/system/mongod.service:10: PIDFil

2. Now, start the MongoDB server by using the command:

sudo service mongod start

Then, verify the status:

service mongod status

3. Now connect to MongoDB server by typing mongo in the shell.

root@ubuntu:/home/r2schools# mongo
MongoDB shell version v4.0.10
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("40c7ccd1-a431-478e-ad16-1a251a26fa08")                                                              }
MongoDB server version: 4.0.10
Server has startup warnings:
2019-07-09T22:33:14.894-0700 I STORAGE  [initandlisten]
2019-07-09T22:33:14.894-0700 I STORAGE  [initandlisten] ** WARNING: Using the XF                                                             S filesystem is strongly recommended with the WiredTiger storage engine
2019-07-09T22:33:14.894-0700 I STORAGE  [initandlisten] **          See http://d                                                             ochub.mongodb.org/core/prodnotes-filesystem
2019-07-09T22:33:26.357-0700 I CONTROL  [initandlisten]
2019-07-09T22:33:26.358-0700 I CONTROL  [initandlisten] ** WARNING: Access contr                                                             ol is not enabled for the database.
2019-07-09T22:33:26.358-0700 I CONTROL  [initandlisten] **          Read and wri                                                             te access to data and configuration is unrestricted.
2019-07-09T22:33:26.358-0700 I CONTROL  [initandlisten]
---
Enable MongoDB's free cloud-based monitoring service, which will then receive an                                                             d 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 acc                                                             essible to you
and anyone you share the URL with. MongoDB may use this information to make prod                                                             uct
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.disableFreeM                                                             onitoring()
---

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Solution 2:

Check port mongod running and connect with that port.

mongo --port port_number

For the same video tutorial: