MongoDB running but can t connect using shell

Question

CentOS 5 x Linux with MongoDB 2 0 1  tried main and legacy-static   MongoDB is running   root     31664  1 5  1 4  81848 11148          Sl   18 40   0 00   mongod -f mongo conf -vvvvv --fork   Using a simple shell connect to get to the server fails    root xxxx bin     mongo MongoDB shell version  2 0 1 connecting to  test Mon Oct 31 18 41 32 Error  couldn t connect to server 127 0 0 1 shell mongo js 84 exception  connect failed   The web interface on port 28017 loads fine  as does using the MongoDB shell from a remote Linux host  Can also telnet to localhost 27017  which means no ports are blocked  There is no SELinux running on this machine as well  I have also tried explicitly specifying localhost 2017 db to no avail       mongo remote-ip 27017 MongoDB shell version  2 0 1 connecting to  remote-ip 27017 test  gt  show dbs local   0 03125GB  gt    Logs are completely mum on the subject         Mon Oct 31 18 40 34  initandlisten  fd limit hard 1024 soft 1024 max conn  819 Mon Oct 31 18 40 34  initandlisten  waiting for connections on port 27017 Mon Oct 31 18 40 34 BackgroundJob starting  snapshot Mon Oct 31 18 40 34 BackgroundJob starting  ClientCursorMonitor Mon Oct 31 18 40 34 BackgroundJob starting  PeriodicTask  Runner Mon Oct 31 18 40 34  websvr  fd limit hard 1024 soft 1024 max conn  819 Mon Oct 31 18 40 34  websvr  admin web console waiting for connections on port 28017   Stracing the mongo shell client shows only one problematic call    pid 31708  connect 4   sa family AF INET  sin port htons 27017   sin addr inet addr  127 0 0 1     16    -1 EBADF  Bad file descriptor    Filesystem is clean  no ulimit restrictions  running as root for testing   I can see from the strace that the mongo client is trying to connect via TCP  AF INET   but since it is local and MongoDB creates a file socket  is there a way to tell the client to connect through that instead  Or better yet  why would the client be throwing a EBADF   EDIT  My basic Mongo conf   dbpath  root mongodb-linux-i686-2 0 1 data logpath  root mongodb-linux-i686-2 0 1 logs mongo log slowms 15 rest 1

User · Answer

Facing the same issue with the error described by Garrett above. 1. MongoDB Server with journaling enabled is running as seen using ps command 2. Mongo client or Mongoose driver are unable to connect to the database.

Solution : 1. Deleting the Mongo.lock file seems to bring life back to normal on the CentOS server. 2. We are fairly new in running MongoDB in production and have been seeing the same issue cropping up a couple of times a week. 3. We've setup a cron schedule to regularly cleanup the lock file and intimate the admin that an incident has occurred.

Searching for a bug fix to this issue or any other more permanent way to resolve it.

User · Answer

I had this problem as well  Is your MongoDB journaling  I noticed the following  preallocate  entries in the log file  Once I saw the last line  waiting for connections on port   I could connect  Notice that this  faster  mode took 12 minutes to intialize   William  Tue Apr 17 16 48 01  initandlisten  MongoDB starting   pid 2248 port 27017 dbpath E  MongoData 64-bit host ME Tue Apr 17 16 48 01  initandlisten  db version v2 0 0-rc0  pdfile version 4 5 Tue Apr 17 16 48 01  initandlisten  git version  8d4bf50111352cee5a4f1abf25b63442d6c45dc4 Tue Apr 17 16 48 01  initandlisten  build info  windows  6  1  7601  2   Service Pack 1   BOOST LIB VERSION 1 42 Tue Apr 17 16 48 01  initandlisten  options    bind ip   ip   dbpath   E  MongoData   directoryperdb  true  journal  true  logpath   E  MongoData mongo log   quiet  true  rest  true  service  true   Tue Apr 17 16 48 01  initandlisten  journal dir E  MongoData journal Tue Apr 17 16 48 01  initandlisten  recover   no journal files present  no recovery needed Tue Apr 17 16 48 02  initandlisten  preallocateIsFaster true 9 68 Tue Apr 17 16 48 04  initandlisten  preallocateIsFaster true 8 44 Tue Apr 17 16 48 06  initandlisten  preallocateIsFaster true 9 68 Tue Apr 17 16 48 06  initandlisten  preallocateIsFaster check took 4 921 secs Tue Apr 17 16 48 06  initandlisten  preallocating a journal file E  MongoData journal prealloc 0 Tue Apr 17 16 52 37  initandlisten  preallocating a journal file E  MongoData journal prealloc 1 Tue Apr 17 16 56 54  initandlisten  preallocating a journal file E  MongoData journal prealloc 2 Tue Apr 17 17 01 42  initandlisten  waiting for connections on port 27017 Tue Apr 17 17 01 42  websvr  admin web console waiting for connections on port 28017

User · Answer

I think there is some default config what is missing in this version of mongoDb client  Try to run   mongo 127 0 0 1 27017   It s strange  but then I ve experienced the issue went away     so the simple command  mongo  w o any params started to work again for me    Ubuntu Linux 11 10 x64   MongoDB 2 0 1

User · Answer

By default  mongodb is configured to listen only to localhost  Excerpt from mongodb default config file       Listen to local interface only  Comment out to listen on all interfaces  bind ip 127 0 0 1   One needs to comment the bind ip to listen from external entities   You wont be able to add shards unless you start listening on non-local interfaces   HTH   Abhay Dandekar

User · Answer

Delete  var lib mongodb mongod lock  then issue sudo service mongodb start  then mongo

User · Answer

You may want to check your config to see if the bind ip is set     bind ip  127 0 0 1   If it is then this permits only local logins   Comment this out and restart mongo  this may help

User · Answer

Not so much an answer but more of an FYI I ve just hit this and found this question as a result of searching  Here is the details of my experience   Shell error  markdsievers ip-xx-xx-xx-xx    mongo MongoDB shell version  2 0 1 connecting to  test Wed Dec 21 03 36 13 Socket recv   errno 104 Connection reset by peer 127 0 0 1 27017 Wed Dec 21 03 36 13 SocketException  remote  127 0 0 1 27017 error  9001 socket exception  1  server  127 0 0 1 27017   Wed Dec 21 03 36 13 DBClientCursor  init call   failed Wed Dec 21 03 36 13 Error  Error during mongo startup     caused by    DBClientBase  findN  transport error  127 0 0 1 query    whatsmyuri  1   shell mongo js 84 exception  connect failed   Mongo logs reveal  Wed Dec 21 03 35 04  initandlisten  connection accepted from 127 0 0 1 50273  6612 Wed Dec 21 03 35 04  initandlisten  connection refused because too many open connections  819   This perhaps indicates the other answer  JaKi  was experiencing the same thing  where some connections were purged and access made possible again for the shell  other clients

User · Answer

This is actually not an error    What happens here is that Mongo relies on a daemon in order to run the local database server  so in order to  fire up  the mongo server in your shell  you have to start the mongo service first   For Fedora Linux  wich is the Distro I use  You have to run these commands   1 sudo service mongod start 2 mongo   And there you have it  the server is going to run  Now  If you want Mongo service to Start when the system boots then you have to run   sudo chkconfig --levels 235 mongod on   And that s all  If you do that  now in the shell you just have to type mongo in order to start the server but that s pretty much it  the problem is you have to start the SERVICE first and then the SERVER     P S  The commands I posted might work on other linux distros as well  not just in fedora    In case not maybe you have to tweak some words depending on the distro you re using

User · Answer

I had same problem  In my case MongoDB server wasn t running    Try to open this in your web browser      http   localhost 28017   If you can t  this means that you have to start MongoDB server   Run mongod in another terminal tab  Then in your main tab run mongo which is is the shell that connects to your MongoDB server

User · Answer

I had a similar problem  well actually the same  mongo process is running but can t connect to it    What I did was went to my database path and removed mongod lock  and then gave it another try  restarted mongo   After that it worked    Hope it works for you too  mongodb repair on ubuntu

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I found   this  very useful   If you are getting the following message  start  Rejected send message  1 matched rules  type  method call   sender   1 84   uid 1000 pid 3215 comm  start mongodb    interface  com ubuntu Upstart0 6 Job  member  Start  error name   unset   requested reply  0  destination  com ubuntu Upstart   uid 0 pid 1 comm   sbin init   shriprasad shriprasad-HP-430-Notebook-PC  var lib mongodb  mongo   You must be trying to start the mongodb service as user other than root  You must be root user  Thus log in as root and then run following command as follows   sudo bash   followed by  service mongodb start

User · Answer

Open the file  etc mongod conf and add the ip of the machine from where you are connecting  to bind ip  bind ip   127 0 0 1 your Remote Machine Ip Address Here  Ex -  bind ip   127 0 0 1 192 168 1 5   Restart mongodb service   sudo service mongod restart   Make sure mongodb port is opened in the firewall   You can also comment the line  if you are not worried about security

User · Answer

After starting the mongod   mongod --dbpath  lt db name gt    to get shell   mongo --shell

User · Answer

I don t see this having an accepted answer yet  so I ll just add my 2 cents   I had the exact same issue just now  After a while I realized I ve locked localhost out in my iptables rules  So  check your firewall

User · Answer

On Ubuntu   Wed Jan 27 10 21 32 Error  couldn t connect to server 127 0 0 1 shell mongo js 84 exception  connect failed  Solution  look for if mongodb is running by following command   ps -ef   grep mongo   If mongo is not running you get    vimal     1806  1698  0 10 11 pts 0    00 00 00 grep --color auto mongo   You are seeing that the mongo daemon is not there   Then start it through configuration file with root priev    root vimal  data  mongod --config  etc mongodb conf  amp   1  2131 root vimal  data  all output going to   var log mongodb mongodb log   you can see the other details   root vimal    more  etc mongodb conf   Open a new terminal to see the result of  mongod --config  etc mongodb conf  amp  then type mongo  It should be running or grep  root vimal  data  ps -ef   grep mongo  root      3153     1  2 11 39          00 00 23 mongod --config  etc mongodb conf root      3772  3489  0 11 55 pts 1    00 00 00 grep --color auto mongo    NOW  root vimal  data  mongo  MongoDB shell version  2 0 4 connecting to  test   you get the mongoDB shell  This is not the end of story  I will post the repair method so that it starts automatically every time  most development machine shutdowns every day and the VM must have mongo started automatically at next boot

User · Answer

If your mongoDB server remote server  s version is greater then 4 0 3  then you will face this issue  Hence you should replace your current mongo-client shell with below mongo    sudo apt-key adv --keyserver hkp   keyserver ubuntu com 80 --recv 9DA31620334BD75D9DCB49F368818C72E52529D4 echo  deb   arch amd64 arm64   https   repo mongodb org apt ubuntu xenial mongodb-org 4 0 multiverse    sudo tee  etc apt sources list d mongodb-org-4 0 list sudo apt-get update sudo apt-get install -y mongodb-org   Then you mongo client will be able to connect your remove mongodb

User · Answer

If your bind ip is set to anything other than 127 0 0 1 then you ll need to add the ip explicitly even from the local machine   So simply use the same method that you re using on the remote box on the local box   At least that s what did it for me

[shell] MongoDB running but can't connect using shell

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