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 file on a read-only directory   data db  terminating  initandlisten  shutdown  going to close listening sockets     initandlisten  shutdown  going to flush diaglog     initandlisten  now exiting  initandlisten  shutting down with code 100

User · Answer

First of all stop all the mongoDB services  then create a directory on     it means root  if you don t have  and remove the port file also  give all permission to that directory  become that directory owner  run below command   sudo service mongod stop sudo rm -rf  tmp mongod  sudo mkdir -p  data db sudo chmod -R a wxr  data sudo chown -R  USER  USER  data   Now you re done  just start the MongoDB service  if didn t help  try to change the port like   sudo service mongod restart  amp  amp  mongod   if didn t help run below cmd mongod --port 27018   Note  For me all this stuff works and hoping would work for you  guy

User · Answer

I experienced the same problem and following solution solved this problem  You should try the following solution      sudo mkdir -p  data db    sudo chown -R  username   data db

User · Answer

I dealt with the same problem   Change to the MongoDB directory which contains the bin directory  and run   sudo bin mongod    Running MongoDB as the root user you might be asked to enter the root password  If you still can not run the MongoDB  then check the permissions for MongoDB s data directory  Enter   ls -ld  data   or type ls -l   for the permissions for all directories and files in the directory including the  data directory   The permission mode for the root user should be  rwx   meaning the root user is able to read  write and execute the files  To make this happen  we use   chmod 755  data    755 is a octal notation to set the permissions  of the  data directory to  rwxr-xr-x   which means the root user can read  write and execute  whereas the  group  and  everyone are able to only read and execute   Note  When you can t do this  type instead   sudo chmod 755  data      to set the permission as the root user   Then  when done with that step  recapture the permission modes using   ls -ld  data   which should look like   drwxr-xr-x  3 root  wheel  102 Mar  3 17 00  data   You don t need to worry about the  d  at the beginning  and notice that the permissions reflect  rwxr-xr-x    You can now change back to the MongoDB directory and type    sudo bin mongod     to run MongoDB

User · Answer

If your system is using SELinux  make sure that you use the right context for the directory you created   ls -dZ  data db  ls -dZ  var lib mongo    and clone the context with   chcon -R --reference  var lib mongo  data db

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Fix the permissions of   data db  or  var lib mongodb    sudo chown -R mongodb   data db   then restart MongoDB e g  using  sudo systemctl restart mongod   In case that does not help  check your error message if you are using a data directory different to  var lib mongodb  In that case run  sudo chown -R mongodb   lt insert your data directory here gt    source

User · Answer

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

User · Answer

If you are On Windows  and you are trying to setup MongoDB  run cmd as Admnistrator is the way forward as Enrique suggested above see it here

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Check if SElinux is enabled  If it is in enforcing mode just try with permissive mode  In case that helps you should create SElinux policies for mongodb  You can try with audit2allow - check https   access redhat com documentation en-us red hat enterprise linux 6 html security-enhanced linux sect-security-enhanced linux-fixing problems-allowing access audit2allow

User · Answer

On a Mac  I had to do the following   sudo chown -R  USER  data db sudo chown -R  USER  tmp    because there was also a file inside  tmp which Mongo also needed access

User · Answer

This worked for me in Ubuntu LTS 20 04     sudo service mongod start

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you just need to run the command as a super user   just type from the terminal  sudo su mongod

User · Answer

If you do not need to have the database directories in root  you can create data db in your home directory  mkdir -p   data db    Then you can start the MongoDB server with the --dbpath option   mongod --dbpath   echo    data db    This is assuming you re starting it from a terminal  For some strange reason  mongod does not accept   as the home directory path  hence the bash echo substitution trickery  you may as well write  home yourusername data db   In fact  it does not have to be   data db  it can be anywhere you want and this way you can have multiple database paths and organize everything nicely  May not be the best option for production  depending on what you want to do   but for developing works fine

User · Answer

Nice solutions  but I wonder why nobody is giving the solution for windows   If you are using windows you just have to  Run as Administrator  the cmd

User · Answer

The problem is that the directory you created   data db is owned by and only writable by the root user  but you are running mongod as yourself  There are several ways to resolve this  but ultimately  you must give the directory in question the right permissions  If this is for production  I would advise you to check the docs and think this over carefully -- you probably want to take special care   However  if this is just for testing and you just need this to work and get on with it  you could try this  which will make the directory writable by everyone    gt  sudo chmod -R go w  data db   or this  which will make the directory owned by you    gt  sudo chown -R  USER  data db

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

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