Couldn t connect to server 127 0 0 1 27017

Question

I m getting the following error   alex alex-K43U    mongo MongoDB shell version  2 2 0 connecting to  test Thu Oct 11 11 46 53 Error  couldn t connect to server 127 0 0 1 27017 src mongo shell mongo js 91 exception  connect failed alex alex-K43U       This is what happens when I try to start mongodb     Starting database mongodb                                              fail    I already tried mongo --repair  I made chown and chmod to var  lib  and data db and log mongodb   Not sure what else to do  Any suggestions   mongodb log         SERVER RESTARTED         Thu Oct 11 08 29 40  Thu Oct 11 08 29 40 warning  32-bit servers don t have journaling enabled by default  Please use --journal if you want durability  Thu Oct 11 08 29 40  Thu Oct 11 08 29 41  initandlisten  MongoDB starting   pid 1052 port 27017 dbpath  var lib mongodb 32-bit host alex-K43U Thu Oct 11 08 29 41  initandlisten   Thu Oct 11 08 29 41  initandlisten     NOTE  when using MongoDB 32 bit  you are limited to about 2 gigabytes of data Thu Oct 11 08 29 41  initandlisten           see http   blog mongodb org post 137788967 32-bit-limitations Thu Oct 11 08 29 41  initandlisten           with --journal  the limit is lower Thu Oct 11 08 29 41  initandlisten   Thu Oct 11 08 29 41  initandlisten  db version v2 2 0  pdfile version 4 5 Thu Oct 11 08 29 41  initandlisten  git version  f5e83eae9cfbec7fb7a071321928f00d1b0c5207 Thu Oct 11 08 29 41  initandlisten  build info  Linux domU-12-31-39-01-70-B4 2 6 21 7-2 fc8xen  1 SMP Fri Feb 15 12 39 36 EST 2008 i686 BOOST LIB VERSION 1 49 Thu Oct 11 08 29 41  initandlisten  options    config    etc mongodb conf   dbpath    var lib mongodb   logappend   true   logpath    var log mongodb mongodb log    Thu Oct 11 08 29 41  initandlisten  Unable to check for journal files due to  boost  filesystem  basic directory iterator constructor  No such file or directory    var lib mongodb journal                  Unclean shutdown detected  Please visit http   dochub mongodb org core repair for recovery instructions                Thu Oct 11 08 29 41  initandlisten  exception in initAndListen  12596 old lock file  terminating Thu Oct 11 08 29 41 dbexit   Thu Oct 11 08 29 41  initandlisten  shutdown  going to close listening sockets    Thu Oct 11 08 29 41  initandlisten  shutdown  going to flush diaglog    Thu Oct 11 08 29 41  initandlisten  shutdown  going to close sockets    Thu Oct 11 08 29 41  initandlisten  shutdown  waiting for fs preallocator    Thu Oct 11 08 29 41  initandlisten  shutdown  closing all files    Thu Oct 11 08 29 41  initandlisten  closeAllFiles   finished Thu Oct 11 08 29 41 dbexit  really exiting now   EDIT   I removed the lock then did mongod repair and got this error   Thu Oct 11 12 05 37  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   so I did it with sudo   alex alex-K43U    sudo mongod --repair Thu Oct 11 12 05 42  Thu Oct 11 12 05 42 warning  32-bit servers don t have journaling enabled by default  Please use --journal if you want durability  Thu Oct 11 12 05 42  Thu Oct 11 12 05 42  initandlisten  MongoDB starting   pid 5129 port 27017 dbpath  data db  32-bit host alex-K43U Thu Oct 11 12 05 42  initandlisten   Thu Oct 11 12 05 42  initandlisten     NOTE  when using MongoDB 32 bit  you are limited to about 2 gigabytes of data Thu Oct 11 12 05 42  initandlisten           see http   blog mongodb org post 137788967 32-bit-limitations Thu Oct 11 12 05 42  initandlisten           with --journal  the limit is lower Thu Oct 11 12 05 42  initandlisten   Thu Oct 11 12 05 42  initandlisten  db version v2 2 0  pdfile version 4 5 Thu Oct 11 12 05 42  initandlisten  git version  f5e83eae9cfbec7fb7a071321928f00d1b0c5207 Thu Oct 11 12 05 42  initandlisten  build info  Linux domU-12-31-39-01-70-B4 2 6 21 7-2 fc8xen  1 SMP Fri Feb 15 12 39 36 EST 2008 i686 BOOST LIB VERSION 1 49 Thu Oct 11 12 05 42  initandlisten  options    repair  true   Thu Oct 11 12 05 42  initandlisten  Unable to check for journal files due to  boost  filesystem  basic directory iterator constructor  No such file or directory    data db journal  Thu Oct 11 12 05 42  initandlisten  finished checking dbs Thu Oct 11 12 05 42 dbexit   Thu Oct 11 12 05 42  initandlisten  shutdown  going to close listening sockets    Thu Oct 11 12 05 42  initandlisten  shutdown  going to flush diaglog    Thu Oct 11 12 05 42  initandlisten  shutdown  going to close sockets    Thu Oct 11 12 05 42  initandlisten  shutdown  waiting for fs preallocator    Thu Oct 11 12 05 42  initandlisten  shutdown  closing all files    Thu Oct 11 12 05 42  initandlisten  closeAllFiles   finished Thu Oct 11 12 05 42  initandlisten  shutdown  removing fs lock    Thu Oct 11 12 05 42 dbexit  really exiting now   But still having the same problem

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MAC OS if you have mac and useing mongodb4 4  you can run  brew services start mongodb-community 4 4

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I have mongo version 3 2 1 and had to delete the lock file from  data db  and after this  ran mongod and it started successfully    gt rm  data db mongod lock  gt mongod

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Step 1  Remove lock file  sudo rm  var lib mongodb mongod lock  Step 2  Repair mongodb   sudo mongod --repair   Step 3  start mongodb  sudo start mongodb  or sudo service mongodb start  Step 4  Check status of mongodb  sudo status mongodb  or    sudo service mongodb status  Step 5  Start mongo console  mongo

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In the terminal run these commands  1     sudo service mongod start   2       mongo

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For future reference Follow these steps to avoid similar errors   1 Download MondoDB https   www mongodb com   2 Open a terminal and cd into your downloads folder or whatever folder youve saved your mondodb download Ensure you extract your mongodb folder before you cd into it   cd Downloads   3 Move mongodb to your usr local path  sudo mv mongodb-osx-     usr local mongodb   4 cd into your local folder  cd  usr local mongodb   5 make a new directory  sudo mkdir -p  data db   6 cd into the new directory just created above  cd  data db   7 give mongo permisions  sudo chown YourMacUserName  data db   8 Then go open your  bash profile  To do so follow these steps   In your a new terminal  1 cd 2 pwd 3 ls -l  Check if the  bash profile appears on your list of files on your terminal  if not create the -bash profile  Creating  bash profile   In your terminal  touch  bash profile    skip this step if you already have a  bash profile  Step8   Next in your terminal   open  bash profile   And in your bash file that pops open add the following   MONGO PATH  usr local mongodb export PATH  PATH  MONGO PATH bin   And then save  File Save or command S CMD S   Step9 back in your terminal   source  bash profile   Now open two terminals One will for your mondo daemon the other for your mongo   Terminal 1  in your terminal type mongod  mongodb   Output    Terminal 2   mongo   Output    Also make sure you dont make the following typo error when starting your mongod in your terminal  This is incorrect  mongo d   gives off the following error   Failed to connect to 127 0 0 1 27017  in checking socket for error after poll   reason  Connection refused  This is Correct   mongod    There should be no space between the words mongo and d  mondod  Finally always keep in mind that you have to run mondod before you run mongo on your terminals

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Although the answers are received  I would wish to discuss about network errors in MongoDB     Setting the safe write concerns is not the full proof method to make sure that we re safe  Let s assume that w 1  amp  j true are set  what if the write acknowledgement didn t received from the server  Well  the likelyhood is it didn t happened  but it might have happened  The reason why this might have happened is that there are network errors - there are reasons that we may not receive an affirmative response  So  we can send the request from the application through a driver of language of choice  mongod can complete it successfully and then there could be a TCP reset  and the network actually can get reset in a way that we never receive response  So  we could get an error and on the error  we might assume that we got an error  It didn t happened  but it may happen   For an insert  it s possible to guard against it  It s possible because if we let the driver create the  id and we do an insert - then we could do that insert multiple times and it would be any harm  Because  if we do this 1st time and we get an error and we re not sure whether or not that insert completed because it s a network error   then we could just do it again  And provided we perform it again  tyr to perform it with the exact  id  The worst case scenario is we ll get a duplicate key error when we try to insert it   However  an update is where the problem occurs  Especially  the update which is not item potent  that for instance included a  ink command  So  we re telling the database to increment a certain field  Well in that case  if we get a network error and we don t know whether or not the update occurred  Now  maybe we know enough about the values that we can check with them that the update occurred  which is fine  But if we don t know the starting value in the database for that field  then it s not possible for us to know whether or not it occurred or not in case of network error  This kind of issues are extremely rare with a fine network   And if we really need to avoid it at all costs  what we need to do is turn on all our updates into inserts  by reading the full value of the document out of the database and then potentially deleting it and inserting it again or just inserting a new one   The reasons why an application may receive an error back even if the write was successful    The network TCP connection between the application and the server was reset after the server received a write but before a response could be sent  The MongoDB server terminates between receiving the write and responding to it  The network fails between the time of the write and the time the client receives a response to the write

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After frequent attempt finally I got to troubleshoot the problem     Step 1  ps aux   grep mongo Step 2  sudo rm  var lib mongodb mongod lock Step 3  sudo mongod --repair Step 4  mongo

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Did you run mongod before running mongo    I followed installation instructions for mongodb from http   docs mongodb org manual tutorial install-mongodb-on-os-x  and I had the same error as you only when I ran mongo before actually running the mongo process with mongod  I thought installing mongodb would also launch it but you need to launch it manually with mongod before you do anything else that needs mongodb

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After removing mongod lock which was inside the data directory in my windows OS it was still showing the same error message  I had to run mongod with --dbpath  to make the mongo command run without errors

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Try running mongod before mongo    sudo  usr sbin mongod on my opensuse  This solved my problem

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This Works for me To stop the mongodb use   use admin db shutdownServer     And to Restart              sudo service mongod restart

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You can check with netstat -anp   grep 27017 to see if the port is in use by another process

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Sample solution Press Window R and type services msc to  view all the services on machine Then  find MongoDBServer right click it and start it  Then go to C  Program Files MongoDB Server 4 2 bin  and type mongo on command promt

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Adding the bin to PATH in Environment Variables helped    GOTO Installation Path and copy the    bin to the PATH variables in environment variables in Windows

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simple Run Two commends   sudo rm  var lib mongodb mongod lock sudo mongod --repair

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This error could be caused by the MongoDB s bind IP setting  You can check MongoDB s config file by    sudo vi  etc mongodb conf   In my case  the bind IP is set to server s intranet address  just as following   bind ip   10 10 1 14   port   27017   So I have give mongo an IP parameter to connect to shell by type     mongo 10 10 1 14   Don t forget to restart mongodb service if you changed the config

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I got a similar error but the root cause was different   After installing the mongodb using homebrew  https   docs mongodb com manual installation  I have to start the  mongod  service before giving the  mongo  command on terminal

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Check your filesystem free space and increase it if its less  This also could cause the mongo not to start  Check the  var log mongodb mongodb log file   ERROR  Insufficient free space for journal files Please make at least 3379MB available in  var lib mongodb journal or use --smallfiles

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This it s because the mongod process it s down  you must to run the commands bellow in order to get up the mongod process      sudo service mongodb stop     sudo rm  var lib mongodb mongod lock     sudo mongod --repair --dbpath  var lib mongodb     sudo mongod --fork --logpath  var lib mongodb mongodb log --dbpath  var lib mongodb     sudo service mongodb start   Hope this helps you

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This worked for me   sudo rm  var lib mongodb mongod lock     sudo service mongodb restart

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1 Create new folder in d drive D  data db  2 Open terminal on  D  data db  3 Type mongod and enter   4 Type mongo and enter   and your mongodb has strated

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In windows run cmd as Admin    Create directory   mkdir c  mongo data db Install service   mongod exe --install --logpath c  mongo logs --logappend --bind ip 127 0 0 1 --dbpath c  mongo data db --directoryperdb Start MongoDB   net start MongoDB   4 Start Mongo Shell   c  mongo bin mongo exe   This solution work fine for me

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so first you have to remove the mongod lock  file by below command  sudo rm  var lib mongodb mongod lock   and then restart the mongo service by issuing below command   sudo service mongod restart

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Try  sudo service mongodb start   This solved my issue

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Just run mongod --repair from C  Program Files MongoDB Server 4 0 bin  Here is the doc https   docs mongodb com manual tutorial recover-data-following-unexpected-shutdown

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type windows r and enter the following      services msc      start MongoDB   now type  mongo  in cmd in the respective path where the mongo exe is present  it will start working

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Ubuntu 18 04LTS   The problem arises when I uninstalled my previous version completely and installed 4 2 6  After hr s of googling  I solved another problem  MongoDB Failing to Start -    aborting after fassert   failure  I was hopeless about the problem couldn t connect to server  because everything seems ok   Finally  I decided to restart the operating system and guess what    BINGO   sudo mongo    works like a charm

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Err   Couldn t connect to server 127 0 0 1 27017  This is solution for WINDOWS users enter code here 1  Create directory   mkdir c  mongo data db    Install service  first go to your bin directory in programs files of MongoDB with cd    mongod exe --install --logpath   Start MongoDB   net start MongoDB   4 Start Mongo Shell    c  mongo bin mongo exe  or   go to until bin and enter mongo  Note   Open terminal in Administrator mode

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The log indicates that mongodb is terminating because there is an old lock file    If you are not and were not running with journaling  remove the lock file  run repair  and start mongodb again   If you are or were running with journaling turned on  see the relevant Mongo DB docs  Note that they say  If you are running with Journaling you should not do a repair to recover to a consistent state   So if you were journaling  the repair may have made things worse

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Just try   sudo service mongod restart

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I followed the doc at http   docs mongodb org manual tutorial install-mongodb-on-red-hat    After configured and reboot  I executed sudo service mongod start and got      FAILED    At last  I found that mongod had started  I think the yum install added it to auto start   To check if your mongod is running  service mongod status    Hope this can help someone has same problem

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If you are using OS X systems  there is no service commands  So you won t be able to execure sudo service mongod start   Check this answer https   unix stackexchange com a 155746 for more help

[mongodb] Couldn't connect to server 127.0.0.1:27017

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