Not able to run Mongodb on ubuntu - database

Question

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

Answer 3

Try this one. This may help.
sudo chmod 777 /data/db