Failed to start mongod service Unit mongod service not found

Question

I follow all the steps mention in MongoDB installation documents for Ubuntu 16 04   Steps 1    sudo apt-key adv --keyserver hkp   keyserver ubuntu com 80 --recv 2930ADAE8CAF5059EE73BB4B58712A2291FA4AD5   Steps 2    echo  deb   arch amd64 arm64   https   repo mongodb org apt ubuntu xenial mongodb-org 3 6 multiverse    sudo tee  etc apt sources list d mongodb-org-3 6 list   Steps 3    sudo apt-get update   Steps 4    sudo apt-get install -y mongodb-org   Steps 5    sudo service mongod start   when I started MongoDB got an error as       Failed to start mongod service  Unit mongod service not found

User · Answer

Just follow the below commands  This has worked for me    Uninstall your mongo completely from your system   sudo service mongod stop sudo apt-get purge mongodb-org sudo rm -r  var log mongodb sudo rm -r  var lib mongodb  Now reinstall mongodb using following commands   sudo apt update sudo apt install -y mongodb     Note  The database server is automatically started after installation  Next  let s verify that the server is running and works correctly   sudo systemctl status mongodb   You ll see this output   mongodb service - An object document-oriented database Loaded  loaded   lib systemd system mongodb service  enabled  vendor preset  enabled  Active  active  running  since Sat 2018-05-26 07 48 04 UTC  2min 17s ago Docs  man mongod 1  Main PID  2312  mongod  Tasks  23  limit  1153  CGroup   system slice mongodb service     -2312  usr bin mongod --unixSocketPrefix  run mongodb --config  etc mongodb conf

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For Ubuntu 16 04 5  it is noticed that MongoDB installations does not auto enable the mongod service file after installation in my case after I have installed on several servers  so we need to enable it like below   Issue below to check whether mongod is enabled  systemctl list-unit-files --type service   If it shows as  disabled   then you need to enable it   sudo systemctl enable mongod service   If we want to see whether mongod service file exists in case this file is missing  check in  ls  lib systemd system   You will see a file   lib systemd system mongod service

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Please follow the below steps  it should work   1 - Uninstall current installation completely  Source - official instructions  sudo service mongod stop   Remove Packages  sudo apt-get purge mongodb-org    Remove the folders  sudo rm -r  var log mongodb sudo rm -r  var lib mongodb   2 - Reinstall as described on official site  I will just write down the all steps  enter link description here  Import the public key  sudo apt-key adv --keyserver hkp   keyserver ubuntu com 80 --recv 2930ADAE8CAF5059EE73BB4B58712A2291FA4AD5   Create a list file for Ubuntu 16 04  echo  deb   arch amd64 arm64   https   repo mongodb org apt ubuntu xenial mongodb-org 3 6 multiverse    sudo tee  etc apt sources list d mongodb-org-3 6 list   update the list  sudo apt-get update   Install the latest package  sudo apt-get install -y mongodb-org   3 - Now it should work  please try below command  sudo service mongod start   and check the status  mongo   it should appear the mongo shell

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Failed to start mongod service  Unit mongod service not found  If you are following the official doc and are coming across with the error above that means mongod service is not enabled yet on you machine  I am talking about Ubuntu 16 04   You need to do that using following command  sudo systemctl enable mongod service   Now you can start mongodb using the following command  sudo service mongod start

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You can repair    sudo rm  var lib mongodb mongod lock   mongod --repair   sudo service mongodb start   For Stop    sudo service mongodb stop   For Restart-    sudo service mongodb restart   For Status-    sudo service mongodb status

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As per documentation   Run this command to reload the daemon   sudo systemctl daemon-reload   After this you need to restart the mongod service   sudo systemctl start mongod   To verify that MongoDB has started  run   sudo systemctl status mongod   To ensure that MongoDB will start following a system reboot  run   sudo systemctl enable mongod

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Note that if using the Windows Subsystem for Linux  systemd isn t supported and therefore commands like systemctl won t work      Failed to connect to bus  No such file or directory   See Blockers for systemd   994 on GitHub  Microsoft WSL   The mongo server can still be started manual via mondgod for development of course

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To solve the problem of not being able to start mongodb on ubuntu 16 04 1  look at mongodb log file    2  we find that the error is due to  Failed to unlink socket file  tmp mongodb-27017   3  Look at the permission of file  tmp mongdb-27017 lock and find that the owner is root instead of mongodb  4  Delete the  tmp mongodb-27017 sock file manually and use the command  sudo chown mongodb mongodb  tmp mongodb     5  Start the service with systemcl and use netstat to check whther mongdob has been started on port 27017    Credit  https   www mkyong com mongodb mongodb-failed-to-unlink-socket-file-tmpmongodb-27017  https   hevodata com blog install-mongodb-on-ubuntu

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This happened to me while adding users in admin db    sudo systemctl daemon-reload    is recommended from the official mongo website  but did not help    If you get      Job for mongod service failed because the control process exited with error code  See  systemctl status mongod service  and  journalctl -xe  for details    While executing   sudo systemctl start mongod   run journalctl -xe and if the issue is   Failed to start MongoDB Database Server  -- Subject  Unit mongod service has failed   Then run sudo mongod --  mongo This will fix the issue and if you want to run with systemctl  then terminate the windows for mongod and mongo and run   sudo systemctl start mongod    and then mongo

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Well     My answer may be considered naive but in fact it has been the only way MongoDB has work in my case  Ubuntu 19 10  I tried to run the commands from the most voted comments and none worked  when running   mongod --repair   I got this alert     With some research I found out that running the DB in another port could be a solution  then   mongod --port 27018   And it works great for me every time  Long answer but wanted to give context before giving such a simple solution    If I m doing it wrong or doesn t seem logical  plz tell me  Relevant for me

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For those that run into this and end up on this answer  as I did  where they got this error during uninstall orupgrade and Ubuntu keeps failing to uninstall the previous because the service doesn t exist this one line will get you past that and allow the uninstall or upgrade to continue   sudo touch  lib systemd system mongod service

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Just try with this command     sudo systemctl enable mongod

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May be you are using a wrong version of mongodb list file  I faced this problem but it s my mistake when not selecting the right list file for Ubuntu 16 04  The default selected is for Ubuntu 14 04 and it s the reason for my error   Failed to start mongod service  Unit mongod service not found

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You are missing a  b  I think    sudo service mongod start   should be  sudo service mongodb start   I think this is the case

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The following steps helped me solve the problem of not being able to start mongodb on Ubuntu Server 18 04 LTS  Step 1  First  remove MongoDB from previous if installed     sudo apt remove --autoremove mongodb-org  Step 2  Remove any mongodb repo list files     sudo rm  etc apt sources list d mongodb  list sudo apt update   Step 3  Import the public key used by the package management system   sudo apt-key adv --keyserver hkp   keyserver ubuntu com 80 --recv 9DA31620334BD75D9DCB49F368818C72E52529D4   Step 4  Create a list file for MongoDB   echo  deb   arch amd64   https   repo mongodb org apt ubuntu bionic mongodb-org 4 0 multiverse    sudo tee  etc apt sources list d mongodb-org-4 0 list   Step 5  Reload local package database   sudo apt-get update   Step 6  Install the MongoDB packages   sudo apt-get install -y mongodb-org   Step 7  Start MongoDB   sudo service mongod start   Step 8  Begin using MongoDB   mongo   Hope it helps you

User · Answer

I got the same error too    my error is unmet dependencies  var cache apt archives mongodb-org-server 4 4 2 amd64 deb and I ran this  sudo dpkg -i --force-all  var cache apt archives mongodb-org-server 4 4 2 amd64 deb  and it worked

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I got the same error for a long while  tried almost all installation isntruciton on google but could not find te answer     I followed the instructions from https   docs mongodb com manual tutorial install-mongodb-on-ubuntu  but keep getting the error  Failed to start mongod service  Unit mongod service not found  I firstly installed using  sudo apt-get install -y mongodb-org Then noticed that wher I run     sudo apt-get install -y mongodb-org Reading package lists    Done Building dependency tree        Reading state information    Done The following additional packages will be installed    mongodb-org-mongos mongodb-org-shell mongodb-org-tools The following NEW packages will be installed   mongodb-org mongodb-org-mongos mongodb-org-shell mongodb-org-tools 0 to upgrade  4 to newly install  0 to remove and 46 not to upgrade  Need to get 0 B 40 1 MB of archives  After this operation  178 MB of additional disk space will be used  Selecting previously unselected package mongodb-org-shell   Reading database     379307 files and directories currently installed   Preparing to unpack     mongodb-org-shell 4 0 3 amd64 deb     Unpacking mongodb-org-shell  4 0 3      Selecting previously unselected package mongodb-org-mongos  Preparing to unpack     mongodb-org-mongos 4 0 3 amd64 deb     Unpacking mongodb-org-mongos  4 0 3      Selecting previously unselected package mongodb-org-tools  Preparing to unpack     mongodb-org-tools 4 0 3 amd64 deb     Unpacking mongodb-org-tools  4 0 3      Preparing to unpack     mongodb-org 4 0 3 amd64 deb     Unpacking mongodb-org  4 0 3      Setting up mongodb-org-shell  4 0 3      Setting up mongodb-org-mongos  4 0 3      Processing triggers for man-db  2 8 3-2ubuntu0 1      Setting up mongodb-org-tools  4 0 3      Setting up mongodb-org  4 0 3          mongod --version db version v2 6 12 2018-10-26T12 03 12 362 0200 git version  d73c92b1c85703828b55c2916a5dd4ad46535f6a   The db version was 2 6 12 instead of the latest one 4 0 3  So make sure you dont have  mongodb-org-server already installed  if yes  then make sure you uupdate it to your target version  as indicated  https   docs mongodb com manual tutorial install-mongodb-on-ubuntu  -  Step 4 - Install a specific release of MongoDB    target version   4 0 3  sudo apt-get install -y mongodb-org target version mongodb-org-server target version mongodb-org-shell target version mongodb-org-mongos target version mongodb-org-tools target version    sudo apt-get install -y mongodb-org 4 0 3 mongodb-org-server 4 0 3 mongodb-org-shell 4 0 3 mongodb-org-mongos 4 0 3 mongodb-org-tools 4 0 3 Reading package lists    Done Building dependency tree        Reading state information    Done The following NEW packages will be installed   mongodb-org mongodb-org-mongos mongodb-org-shell mongodb-org-tools The following packages will be upgraded    mongodb-org-server 1 to upgrade  4 to newly install  0 to remove and 45 not to upgrade  Need to get 15 7 MB 55 8 MB of archives  After this operation  217 MB of additional disk space will be used  Get 1 https   repo mongodb org apt ubuntu bionic mongodb-org 4 0 multiverse amd64 mongodb-org-server amd64 4 0 3  15 7 MB  Fetched 15 7 MB in 2s  6 289 kB s                   Selecting previously unselected package mongodb-org-shell   Reading database     379306 files and directories currently installed   Preparing to unpack     mongodb-org-shell 4 0 3 amd64 deb     Unpacking mongodb-org-shell  4 0 3        Preparing to unpack     mongodb-org-server 4 0 3 amd64 deb     Failed to stop mongod service  Unit mongod service not loaded  invoke-rc d  initscript mongod  action  stop  failed  dpkg  warning  old mongodb-org-server package pre-removal script subprocess returned error exit status 5 dpkg  trying script from the new package instead     dpkg      it looks like that went OK Unpacking mongodb-org-server  4 0 3  over  2 6 12        Selecting previously unselected package mongodb-org-mongos  Preparing to unpack     mongodb-org-mongos 4 0 3 amd64 deb     Unpacking mongodb-org-mongos  4 0 3      Selecting previously unselected package mongodb-org-tools  Preparing to unpack     mongodb-org-tools 4 0 3 amd64 deb     Unpacking mongodb-org-tools  4 0 3      Preparing to unpack     mongodb-org 4 0 3 amd64 deb     Unpacking mongodb-org  4 0 3      Processing triggers for ureadahead  0 100 0-20      Setting up mongodb-org-shell  4 0 3      Setting up mongodb-org-mongos  4 0 3      Processing triggers for systemd  237-3ubuntu10 3      Processing triggers for man-db  2 8 3-2ubuntu0 1      Setting up mongodb-org-tools  4 0 3      Setting up mongodb-org-server  4 0 3      Installing new version of config file  etc mongod conf     Setting up mongodb-org  4 0 3        and after doing this its all working for me  D

User · Answer

It worked for me on ubuntu 20 04  In my case  mongod service file was locked so it was giving me the same error  To resolve the issue - Step 1  Use following command to check if the mongod service is present there cd  usr bin systemd system ls  Step 2  If the file is present there then Run the following command to unlock the file mongod service sudo chmod 777  usr bin systemd system mongod service -R  Step 3  Now run the following commands  sudo systemctl daemon-reload sudo systemctl start mongod sudo systemctl enable mongod

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In some cases for some security reasons the unit would be marked as masked  This state is much stronger than being disabled in which you cannot even start the service manually   to check this  run the following command       systemctl list-unit-files   grep mongod   if you find out something like this       mongod service                         masked   then you can unmask the unit by       sudo systemctl unmask mongod   then you may want to start the service       sudo systemctl start mongod   and to enable auto-start during system boot       sudo systemctl enable mongod   However if mongodb did not start again or was not masked at all  you have the option to reinstall it this way       sudo apt-get --purge mongo      sudo apt-get install mongodb-org   thanks to  jehanzeb-malik

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I just encountered this on my parrot os and this is how I solved it    sudo service mongodb start

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service mongodb start  service mongodb status   the status is active when I started using above command

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The second step of mongo installation is echo  quot deb   arch amd64 arm64   https   repo mongodb org apt ubuntu bionic mongodb-org 4 4 multiverse quot    sudo tee  etc apt sources list d mongodb-org-4 4 list  Instead of this command do it manually  cd  etc apt  nano sources list Write it  deb   arch amd64 arm64   https   repo mongodb org apt ubuntu bionic mongodb-org 4 4 multiverse  And save the file  Continue all process as in installation docs It works for me

User · Answer

Solution   Just type  sudo mongod   It will work

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Do not remove your db if you already have some data you found useful  Just run the command below and you re good  sudo systemctl restart mongodb service

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Most probably unit mongodb service is masked  Use following command to unmask it   sudo systemctl unmask mongod  and re-run  sudo service mongod start

User · Answer

Try this  sudo systemctl start mongod  and to check whether its running use sudo systemctl status mongod

[mongodb] Failed to start mongod.service: Unit mongod.service not found

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