Not able to run Mongodb on ubuntu

Question

While trying to access the mongodb I am getting error that connection is failed

1. while running mongod command I am getting

   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] MongoDB 
   starting : pid=2580 port=27017 dbpath=/data/db 64-bit host=gten
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] db version 
   v3.6.3
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] git 
   version: 9586e557d54ef70f9ca4b43c26892cd55257e1a5
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] OpenSSL 
   version: OpenSSL 1.1.0g  2 Nov 2017
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] allocator: 
   tcmalloc
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] modules: 
   none
   2019-02-25T11:05:05.870+0530 I CONTROL  [initandlisten] build 
   environment:
   2019-02-25T11:05:05.871+0530 I CONTROL  [initandlisten]     
   distarch: x86_64
   2019-02-25T11:05:05.871+0530 I CONTROL  [initandlisten]     
   target_arch: x86_64
   2019-02-25T11:05:05.871+0530 I CONTROL  [initandlisten] options: 
   {}
   2019-02-25T11:05:05.962+0530 I STORAGE  [initandlisten] exception 
   in initAndListen: IllegalOperation: Attempted to create a lock 
   file on a read-only directory: /data/db, terminating
   2019-02-25T11:05:05.962+0530 I CONTROL  [initandlisten] now 
   exiting
   2019-02-25T11:05:05.962+0530 I CONTROL  [initandlisten] shutting 
   down with code:100
   

and while I run mongo command, I am getting

MongoDB shell version v4.0.6
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
2019-02-25T11:16:44.802+0530 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:343:13
@(connect):1:6
exception: connect failed

I dont know what's the issue I have follwe the [https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/] and [https://www.howtoforge.com/tutorial/install-mongodb-on-ubuntu-16.04/] to install the mongo.

Config: I am using UBUNTU 18.04. Any help is appreciated i have gone through many answers and tried all but still facing the same issue.Thanks in advance

After doing a lot of stuff I am getting

2019-02-25T18:52:27.197+0530 I CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] MongoDB starting : pid=27390 port=27017 dbpath=/data/db 64-bit host=gten
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] db version v4.0.6
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] git version: caa42a1f75a56c7643d0b68d3880444375ec42e3
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.1.0g  2 Nov 2017
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] allocator: tcmalloc
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] modules: none
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] build environment:
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten]     distmod: ubuntu1804
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten]     distarch: x86_64
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten]     target_arch: x86_64
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] options: {}
2019-02-25T18:52:27.200+0530 E STORAGE  [initandlisten] Failed to set up listener: SocketException: Address already in use
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] now exiting
2019-02-25T18:52:27.200+0530 I CONTROL  [initandlisten] shutting down with code:48

Answer 1

If you face this issue It means you are trying to connect mongo shall without running server on local which give this problem

Some system are not run mongo service automatically on start of machine. So you need to start it manually.

Run this command to run service on every time when you start your machine or whenever you want to use mongo

sudo service mongod start
// or 
sudo systemctl start mongod

Run sudo service mongod status and see what it returns. If it is stopped, run sudo service mongod start to start the mongodb and try connecting to it.

If sudo service mongod start is giving a error then

Create the file /lib/systemd/system/mongod.service with the following content:

[Unit]
Description=High-performance, schema-free document-oriented database
After=network.target

[Service]
User=mongodb
ExecStart=/usr/bin/mongod --quiet --config /etc/mongod.conf

[Install]
WantedBy=multi-user.target

If you still persist error please share console error. On start, we may help you better.

Answer 2

As per the error, message the user trying to start the mongod process don't have write access to /data/db folder.

Run the following command to enable the user to write to /data/db folder

sudo chown -R $USER:$USER /data/db

or create a new folder with current users permission and start mongod with --dbpath option

mkdir mydata/db

mongod --dbpath mydata/db