Mongod complains that there is no data db folder

Question

I am using my new mac for the first time today  I am following the get started guide on the mongodb org up until the step where one creates the  data db directory  btw  I used the homebrew route    So I open a terminal  and I think I am at what you called the Home Directory  for when I do  ls   I see folders of Desktop Application Movies Music Pictures Documents and Library   So I did a   mkdir -p  data db   first  it says permission denied  I kept trying different things for half and hour and finally    mkdir -p data db   worked  and when I  ls   a directory of data and nested in it a db folder do exist   then I fire up mongod and it complains about not finding data db  Have I done something wrong   Now I have done the   sudo mkdir -p  data db   and when I do a  ls  I do see the data dir and the db dir  inside the db dir though  there is absolutely nothing in it and when I now run mongod  Sun Oct 30 19 35 19  initandlisten  exception in initAndListen  10309 Unable to create open lock file   data db mongod lock errno 13 Permission denied Is a mongod instance already running   terminating Sun Oct 30 19 35 19 dbexit   Sun Oct 30 19 35 19  initandlisten  shutdown  going to close listening sockets    Sun Oct 30 19 35 19  initandlisten  shutdown  going to flush diaglog    Sun Oct 30 19 35 19  initandlisten  shutdown  going to close sockets    Sun Oct 30 19 35 19  initandlisten  shutdown  waiting for fs preallocator    Sun Oct 30 19 35 19  initandlisten  shutdown  lock for final commit    Sun Oct 30 19 35 19  initandlisten  shutdown  final commit    Sun Oct 30 19 35 19  initandlisten  shutdown  closing all files    Sun Oct 30 19 35 19  initandlisten  closeAllFiles   finished Sun Oct 30 19 35 19  initandlisten  shutdown  removing fs lock    Sun Oct 30 19 35 19  initandlisten  couldn t remove fs lock errno 9 Bad file descriptor Sun Oct 30 19 35 19 dbexit  really exiting now   EDIT  Getting error message for  sudo chown mongod mongod  data db  chown  mongod  Invalid argument   Thanks  everyone

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Tilo has the answer that worked for me up until THIS  sudo chown -R 126 135  data db   I had to use  sudo chown -R  USER  data db

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If you run mongo without arguments it s assume you are running on the production machine so it s use the default locations   for using your own database  dev or just a different one        bin mongod --dbpath   data db

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I kept getting the following error when I tried to start mongodb    shutting down with code 100     I was using the following command     mongod --dbpath   mongo-data   The fix for me was that I didn t need the     sign and this was causing the error  So I did     mongod --dbpath   mongo-data   Just wanted to throw this out there because the error in no way specifies that this is the problem  I almost removed the contents of the   mongo-data directory to see if that helped  Glad I remembered that cli args sometimes do not use the     sign

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I did  brew install mongodb   on 2018-02-01 and that gave me mongodb version 3 6 2   Prompted by the answer from orluke above  I tried just    brew services restart mongodb   and everything sprang into life  My mongoose createConnection   call did what I wanted  The GUI MongoDB Compass  the community version  would connect  I used Compass to look at the local startup log collection  That had one document in  the log of me just starting the mongoDB service  and that had  cmdLine Object     config   usr local etc mongod conf    and indeed there was such a file     more  usr local etc mongod conf systemLog    destination  file   path   usr local var log mongodb mongo log   logAppend  true storage    dbPath   usr local var mongodb net    bindIp  127 0 0 1   and there was a  usr local var mongodb directory with lots of obscure files  So that seems to be how the installation works now    I m not sure if brew services restart sets the service to run at login  So I did   brew services stop mongodb brew services start mongodb   and hoped that starts it again after reboot  And  indeed  it did  In fact  now  I think the right thing to do after the initial installation is  brew services start mongodb   and that should start the service and restart it after reboot

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After getting the same error as Nik     chown  id -u  Invalid argument   I found out this apparently occurred from using the wrong type of quotation marks  should have been backquotes  Ubuntu Forums  Instead I just used      sudo chown  USER  data db   as an alternative and now mongod has the permissions it needs

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This solution solves my problem   Make a directory as   sudo mkdir -p  data db That will make a directory named as db and than try to start with commands  sudo mongod   If you get another error or problem with starting mongod  You may find problem as     Failed to set up listener  SocketException  Address already in use   If you find that another error than you have to kill the running process of mongod by typing to terminal as   ps ax   grep mongod sudo kill ps number   and find the mongod running port and kill the process  Another way is to make a specefic port when starting mongod as  sudo mongod --port 27018

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You created the directory in the wrong place   data db means that it s directly under the     root directory  whereas you created  data db   without the leading    probably just inside another directory  such as the   root  homedirectory   You need to create this directory as root  Either you need to use sudo   e g  sudo mkdir -p  data db  Or you need to do su - to become superuser  and then create the directory with mkdir -p  data db    Note    MongoDB also has an option where you can create the data directory in another location  but that s generally not a good idea  because it just slightly complicates things such as DB recovery  because you always have to specify the db-path manually    I wouldn t recommend doing that     Edit   the error message you re getting is  Unable to create open lock file   data db mongod lock errno 13 Permission denied   The directory you created doesn t seem to have the correct permissions and ownership --  it needs to be writable by the user who runs the MongoDB process   To see the permissions and ownership of the   data db   directory  do this   this is what the permissions and ownership should look like     ls -ld  data db  drwxr-xr-x 4 mongod mongod 4096 Oct 26 10 31  data db    The left side  drwxr-xr-x  shows the permissions for the User  Group  and Others    mongod mongod  shows who owns the directory  and which group that directory belongs to  Both are called  mongod  in this case    If your   data db  directory doesn t have the permissions and ownership above  do this   First check what user and group your mongo user has     grep mongo  etc passwd mongod x 498 496 mongod  var lib mongo  bin false   You should have an entry for mongod in  etc passwd   as it s a daemon   sudo chmod 0755  data db sudo chown -R 498 496  data db      using the user-id   group-id   You can also use the user-name and group-name  as follows   they can be found in  etc passwd and  etc group    sudo chown -R mongod mongod  data db    that should make it work    In the comments below  some people used this   sudo chown -R  id -u   data db sudo chmod -R go w  data db   or   sudo chown -R  USER  data db  sudo chmod -R go w  data db   The disadvantage is that  USER is an account which has a login shell  Daemons should ideally not have a shell for security reasons  that s why you see  bin false in the grep of the password file above   Check here to better understand the meaning of the directory permissions   http   www perlfect com articles chmod shtml  Maybe also check out one of the tutorials you can find via Google   UNIX for beginners

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I just wanted to point out here that if you try this and you run into mkdir   data db  Read-only file system  please see this comment  which helped me  https   stackoverflow com a 58895373   That way if anyone is on this answer and does Control F for  read only  they will see this

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Starting with MongoDB 4 4  the MongoDB Database Tools are now released separately from the MongoDB Server  You need to download   https   www mongodb com try download database-tools tck docs databasetools then you copy all the files into  usr bin and all the command lines will be available

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Your command will have created the directory structure in the current folder  not the root directory of your computer  which is what the missing   is    The first command was right  but because you are trying to create a folder in    which is a protected directory  you need to prefix it with sudo  which is short for  superuser do   You ll then be asked for your password   So the full command would be     sudo mkdir -p  data db

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Just a quick note   If you tried running mongod without changing the permissions first  you ll likely have a mongod lock file  and some other files  in the  data db directory   Even after you change the permissions for the  data db directory to give access to your  USER  you ll continue to get the  Unable to create open lock file   data db mongod lock errno 13 Permission denied  error   Run ls -al  data db and you ll probably see that the permissions for the individual files are still set to root for user  not to your  USER  You should remove the mongod lock file  and the others as well   Then when you run mongod again  everything should work  and you can verify that the file permissions match the directory permissions by running ls -al again

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Type  id  on terminal to see the available user ids you can give  Then simply type    sudo chown -R idname  data db   This worked out for me  Hope this resolves your issue

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Mongodb when running mongod looks for   data db folder in as a path for db in the root folder of your device  I solved it by creating a   data folder by running mkdir   data In the root folder check if data folder is there by typing ls  Then navigate to the data folder and double check pwd should give you  Users username data Then run this command to create a mongodb db path sudo mongod --dbpath  Users username data This did it for me and when I ran mongod

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Create the folder   sudo mkdir -p  data db    Give yourself permission to the folder   sudo chown  id -u   data db   Then you can run mongod without sudo  Works on OSX Yosemite

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This works for me  found in comments    sudo chown -R  USER  data db

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Create directory in the Root  sudo mkdir -p  data db   Now change the Owner  sudo chown -R  USER  data   You re good to go   mongod   instead of using sudo mongod  you don t need to put everythime password  but for the real project you should use sudo mongod  don t give permission to normal user

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There is a really dumb way to create this problem  which I have pioneered   1  leave your mongo install for a while 2  come back and the server is not running 3  attempt to start it  but don t use sudo this time 4  mongo can t find data db  because now its looking in the user home dir instead of su home dir  Yes  it is really dumb but if its been a while since you were on the system it can trip you up   Short answer  make sure you run mongo with the same implied home directory

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I had this problem with an existing Mongodb setup  I m still not sure why it happened  but for some reason the Mongod process couldn t find the mongod config file  Because it could not find the config file it tried to find the DB files in  data db  a folder that didn t exist   However  the config file was still available so I made sure the process has permissions to the config file and run the mongod process with the --config flag as follows   mongod --config  etc mongod conf   In the config file itself I had this setting   storage    dbPath   var lib mongodb   And this is how the process could find the real DB folder again

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If you are using Mac and running Catalina and Installed Mongodb via Homebrew what you have to do to start is just type this command and you are good to go  brew services start mongodb-community

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In more current versions of MongoDB  I have 3 2 10  it is stored be default into    var lib mongodb

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I got over this exact same problem by creating the  data db folders with my window manager  I tried doing it though the terminal at first  and in order to create a folder in the root directory  I had to use sudo   I just went to the root directory using Finder and created a new folder using  New Folder   Totally worked for me   Note  I m using OSX

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Installing through brew on Mac where YOUR USER NAME and staff is the group  sudo mkdir -p  data db sudo chmod  x r w  data db  sudo touch  data db mongod lock sudo chown YOUR USER NAME staff  data db sudo chmod  x r w  data db mongod lock sudo chown YOUR USER NAME staff  data db mongod lock

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Till this date I also used to think that we need to create that  data db folder for starting mongod command    But recently I tried to start mongod with service command and it worked for me and there was no need to create  data db directory   service mongod start   As to check the status of mongod you can run the following command   service mongod status

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You re trying to create a directory you don t have root access to   For testing mongodb  I just use a directory from my user directory like   cd mkdir -p temp  mongod --dbpath     This will make a mongo database in temp  from your current working directory

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You need to create  data db     that is a directory called  data  in your root  i e     and subfolder in there called  db       You re getting permission errors becuase you need to use sudo to create a direcotry in your root dir in MacOS  sudo lets you run commands as an administrator   So  run this instead        sudo mkdir -p  data db   This will prompt you for a password  it s the same password you use to change system settings  that little dialog that opens when you try and change things in System Preferences for ecample   and likely the same as you use to login

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MongoDB can be confusing regarding the dbPath folder  When you run mongod without dbpath then the default path is  data db However when you start it as a service  e g  systemctl start mongod then it reads on configuration file  typially  etc mongod cfg and in this config file the defaults are     Platform Package Manager Default storage dbPath     RHEL   CentOS and Amazon yum  var lib mongo   SUSE zypper  var lib mongo   Ubuntu and Debian apt  var lib mongodb   macOS brew  usr local var mongodb     So  by accident your MongoDB tries to access different data folders depending on how you start the service

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After  re -installing the tools package  I got a similar error on a Windows 10 device      exception in initAndListen  NonExistentPath  Data directory C  data db  not found   terminating   Solution Analog to as explained for the linux systems  simply making the folder is sufficient to be able to start the mongod exe  mongoDB server    Thought I might leave it for people that end up here with the same search terms on a Windows device

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To fix that error on OS X  I restarted and stopped the service     brew services restart mongodb   brew services stop mongodb   Then I ran mongod --config  usr local etc mongod conf  and the problem was gone   The error seemed to arise after upgrading the mongodb homebrew package

[macos] Mongod complains that there is no /data/db folder

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