MongoDB: exception in initAndListen: 20 Attempted to create a lock file on a read-only directory: /data/db, terminating

Question

I created /data/db in root directory and ran ./mongod:

[initandlisten] exception in initAndListen: 20 Attempted to create a lock fi         


        

Answer 1

If you are checking your mongodb logs and you are getting such an error then just follow steps as i did. It occurs due to permission issues with your /data/db directory. I am using ubuntu16.04 and I find solution with running two simple commands as follow.

Step 1: Give permission to /data/db directory:

sudo chmod -R 0777 /data/db

Step 2: Try to start mongod service as :

sudo service mongod start

Step 3: Check status of mongod service:

sudo service mongod status

Answer 2

This worked for me in Ubuntu LTS 20.04:

$ sudo service mongod start