[SOLVED] Connection error while installing mongodb on Fedora 28

Issue

I have been trying to install Mongodb but it keeps failing midway. When the download is complete, installation fails with a connection error:

MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:27017
2018-08-17T12:26:33.340+0200 W NETWORK  [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: Connection refused
2018-08-17T12:26:33.340+0200 E QUERY    [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:251:13
@(connect):1:6
exception: connect failed

What I've tried:
1. Changing the port:
mongo --port 4332
but it doesn't connect still:

MongoDB shell version v3.6.3
connecting to: mongodb://127.0.0.1:4332/
2018-08-17T12:32:55.743+0200 W NETWORK  [thread1] Failed to connect to 127.0.0.1:4332, in(checking socket for error after poll), reason: Connection refused
2018-08-17T12:32:55.743+0200 E QUERY    [thread1] Error: couldn't connect to server 127.0.0.1:4332, connection attempt failed :
connect@src/mongo/shell/mongo.js:251:13
@(connect):1:6
exception: connect failed

2. Reinstalling the DB shows up as complete but I still can't start it. Check out the screenshot

3. Checking for any config files in /etc/mongo* or /var/lib/: there is none.
   Note: There's no mongod service available too.

Solution

the installation seem to have worked, but the mongod was not started.

MongoDB need two element :

the "mongo" shell utility, who is used to connect to the database direcly the "mongod" service, who is the true database programs.

to start the mongod, simply use a cmd and use the "mongod" command. this command may fail if :

• the port is already used (default is 27017)
• the dbpath directory was not created (default is /data/db)

Fedora repository do not install both at the same time. the shell is in the repository under the "mongodb" name the server is under the name "mongodb-server"

so to install both, you need to do

dnf install mongodb mongodb-server

and you can then start the mongod service with

sudo service mongod start

more information

Answered By - Félix Brunet

Answer Checked By - Mary Flores (WPSolving Volunteer)