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I'm having problems lauching mongod as a service:
How is it possible that it works when I do sudo mongod -f /etc/mongod.conf but when launching it with sudo service mongod start I get an error in the log
Assertion: 28595:13: Permission denied src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp 267
I'm running mongodb on ubuntu 16
I followed exactly the instructions in the mongodb documentation for installation of that version, so is this a bug? Any suggestions how to solve this are appreciated.
Additional information:
The mongodb service startup script looks like this and runs it as user mongodb, could this be connected to the error?
lib/systemd/system/mongodb.service:
[Unit]
Description=MongoDB Database Service
Wants=network.target
After=network.target
[Service]
ExecStart=/usr/bin/mongod --config /etc/mongod.conf
ExecReload=/bin/kill -HUP $MAINPID
Restart=always
User=mongodb
Group=mongodb
StandardOutput=syslog
StandardError=syslog
[Install]
WantedBy=multi-user.target
I'm having problems lauching mongod as a service: How is it possible that it works when I do sudo mongod -f /etc/mongod.conf but when launching it with sudo service mongod start I get an error in the log
The sudo command starts mongod with root permissions (aka superuser access). If you run mongod as a service the user and group are configured in the service definition (mongodb for both in your example).
There is no need to run the mongod process as the root user, and this is strongly discouraged as per the common security practice of Principle of least privilege.
If you want to test a configuration from the command-line, you could use sudo to run with a specified user instead of the default (root) user.
For example:
sudo -u mongodb mongod -f /etc/mongod.conf
In general, it's best to use a service configuration rather than running mongod manually. With manual invocation you will also have to remember to include parameters like the config file path (as there is no default config path). Without a configuration file, mongod also uses default options such as a dbPath of /data/db.
Assertion: 28595:13: Permission denied src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp 267
The likely cause of your permission errors is having previously started mongod as the root user. Some directories and files may now be owned by the root user, so the mongodb user cannot access those. Your specific error relates to accessing files in the data directory (i.e. the configured storage.dbPath in mongod.conf).
Assuming you haven't changed the default paths in your mongod.conf file, you should be able to recursively adjust permissions to match what the mongod.service definition expects.
First, ensure you have stopped your mongod instance if it is currently running.
Then, recursively adjust permissions to the expected user and group:
# storage.dbPath
sudo chown -R mongodb:mongodb /var/lib/mongodb
# systemLog.path
sudo chown -R mongodb:mongodb /var/log/mongodb
Now you should be able to start mongod as a service. If the service fails to start, there should be further detail in the mongod log file (assuming the log file is writable by the mongodb service user).
Have same problem.
What been in /var/log/mongodb/mongod.log:
2017-05-13T13:46:41.152+0700 E STORAGE [initandlisten] WiredTiger error (13) [1494658001:152518][15821:0x7fb843803cc0], connection: /var/lib/mongodb/journal/WiredTigerPreplog.0000000002: file-remove: unlink: Permission denied
2017-05-13T13:46:41.159+0700 I - [initandlisten] Assertion: 28595:13: Permission denied src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp 267
So wee see that something can't remove file "WiredTigerPreplog.0000000002" in /var/lib/mongodb/journal/
So id just gave permissions, i just did:
sudo chmod 764 /var/lib/mongodb/journal/
If not help, try:
sudo chown -R mongodb:mongodb /var/lib/mongodb/ && sudo chmod 764 /var/lib/mongodb/journal/
There are three set-ups that triggers this kind of problem :
MongoDB installation is configured to create database files at a given path and this path does not exist on your current system. This path is called dbpath in mongo.
In your case, check if /data/db exist. If it doesn't or if it is empty, mongod is trying the wrong dbpath. You need to find it, it's usually under /var/lib/mongodb.
Once you found it there's two thing you can do. First, copy all the file from there to /data/db. Second, change your dbpath under the mongod.conf file, which is located (in linux) at /etc/mongod.conf. Make sure to start mongod with the --config specifying the configuration file.
MongoDB does not have the permission to read one or more files or directories corresponding to its dbpath.
chown mongodb:mongodb dbpath -R.
MongoDB is missing WiredTiger.wt . This can happen if you remove files under the dbpath or if there's a device failure. We do it for testing a recovery strategy for example.
If you're sure dbpath is correct and that there's no instance of WiredTiger.wt there. Your database is broken. There are no ways to ensure integrity if you lose this file. Reinstall mongodb by :
sudo apt-get purge mongodb-org*
sudo rm -r dbpath
sudo apt-get install mongodb-org
Edit :
Or copy dbpath from one of your replicas.
I had same problem in my mongod.log:
2021-09-16T16:06:43.782+0200 F STORAGE [initandlisten] Reason: 13: Permission denied
2021-09-16T16:06:43.782+0200 F - [initandlisten] Fatal Assertion 28595 at src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp 789
So I looked in my dbPath folder (specified in mongodb config file /etc/mongod.conf, section storage:dbPath) and found that same file was owned by root:
WiredTiger.turtle
WiredTigerLAS.wt
journal/WiredTigerLog.0000000112
From dbPath folder, using the command below, I change owner and group to mongodb:
sudo chown mongodb:mongodb WiredTiger.turtle WiredTigerLAS.wt journal/WiredTigerLog.0000000112
After this, I can start mongodb server as
"service mongod start"
and check its status as
"service mongod status" with output:
mongod.service - MongoDB Database Server
Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 2021-09-16 16:19:47 CEST; 54min ago
Docs: https://docs.mongodb.org/manual
Main PID: 8459 (mongod)
CGroup: /system.slice/mongod.service
└─8459 /usr/bin/mongod --config /etc/mongod.conf
Sep 16 16:19:47 svi5-ubu16 systemd[1]: Started MongoDB Database Server.
Note that above commands are working as normal user, not as root.
My configuration: Ubuntu 16.04.2 LTS, MongoDB shell version v4.2.1.
Other file or folder owned by mongodb (user and group):
/var/log/mongodb
/var/lib/mongodb
/tmp/mongodb-27028.sock
I spent a lot of time in solving this issue, thank you very match to every one has posted here and guided me to solution.
I wish append a comment to the previous answer, but unfortunately I cannot yet.
I completely agree with the explanation of Stennie. It is exactly what was happened to me.
I've always run mongod as a service but today, because some changes that I've made, I've tried to run the process using sudo mongod --auth --dbpath /data/mongodb/.. to test authorizations and db changing location.
After that the mongod service didn't run anymore, due to this permissions problem.
I've to say that the command sudo chown -R mongodb:mongodb /data/mongodb/ didn't immediately fix the problem as expected. I've had to reboot several times, remove the mongod.lock file under /data/mongodb/, reissue the sudo chown command again.. and finally everything gone well.
I have a similar issue but with custom log path and data dir. updating the owner and group access to them did not fix the issue for running as a service
updating the group and owner to mongodb:mongodb works on running mongod by itself as stated earlier
sudo -u mongodb mongod -f /etc/mongod.conf
or
sudo mongod -f /etc/mongod.conf
If you find yourself with the same problem on CentOS, but the permissions look correct, it could be because of SELinux policies. On my system, MongoDB files use a specific SELinux context. The mongod server failed to start, outputting the same permissions errors, until I corrected the SELinux contexts.
If it doesn't exist, create the MongoDB data folder (either /var/lib/mongo or /var/lib/mongodb, check your /etc/mongod.conf file):
$ mkdir -p /var/lib/mongodb
Then try to restore the SELinux contexts:
$ restorecon -v /var/lib/mongodb
$ restorecon -v /var/lib/mongodb/*
If that still doesn't work, try to apply the contexts directly:
$ chcon system_u:object_r:mongod_var_lib_t:s0 /var/lib/mongodb
$ chcon system_u:object_r:mongod_var_lib_t:s0 /var/lib/mongodb/*
Verify the contexts are correct:
$ ls -lZ -d /var/lib/mongodb
drwxr-xr-x. mongod mongod system_u:object_r:mongod_var_lib_t:s0 /var/lib/mongodb
sudo chmod -R 666 /var/lib/mongodb
is another solution...
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I followed the MongoDb Docs to setup my first MongoDb,
When I start MongoDB using the command
C:\Program Files\MongoDB\Server\3.4\bin\mongod.exe
I get the following error
exception in initAndListen: 29 Data directory C:\data\db\ not found., terminating
shutdown: going to close listening sockets...
shutdown: going to flush diaglog...
now exiting
shutting down with code:100
MongoDB needs a folder to store the database. Create a C:\data\db\ directory:
mkdir C:\data\db
and then start MongoDB:
C:\Program Files\MongoDB\Server\3.4\bin\mongod.exe
Sometimes C:\data\db folder already exists due to previous installation. So if for this reason mongod.exe does not work, you may delete all the contents from C:\data\db folder and execute mongod.exeagain.
For macOS users to fix this issue:
You need to go through the following steps:
Create the “db” directory. This is where the Mongo data files will live. You can create the directory in the default location by running:
sudo mkdir -p /data/db
Make sure that the /data/db directory has the right permissions by running:
sudo chown -R `id -un` /data/db
You're all set now and you can run sudo mongod to start the Mongo server.
It's not working if you run only mongod
Source.
Same issue on my Mac (using Brew) solved using:
sudo mongod
For macOS users take care of below issue:
if you installing MongoDB Community on macOS using .tgz Tarball
((Starting with macOS 10.15 Catalina, Apple restricts access to the MongoDB default data directory of /data/db. On macOS 10.15 Catalina, you must use a different data directory, such as /usr/local/var/mongodb.))
you can solve it as the following:
(MacOS Catalina onwards)
Apple created a new Volume in Catalina for security purposes. If you’re on Catalina, you need to create the /data/db folder in System/Volumes/Data.
Use this command:
sudo mkdir -p /System/Volumes/Data/data/db
Then, use this command to give permissions:
sudo chown -R `id -un` /System/Volumes/Data/data/db
this will replace normal
sudo mkdir -p /data/db
Make sure that the /data/db directory has the right permissions by running:
sudo chown -R `id -un` /data/db
once you finish and start mongoDB you can use the following in terminal:
sudo mongod --dbpath /System/Volumes/Data/data/db
To change default db folder C:\data\db in windows, the command is:
--dbpath
For example:
\mongod --dbpath C:\myfolder
Mac Users
Instead of running MongoDB with:
sudo mongod
You can use mongod instead if you:
Locate the data folder of mongodb (usually ~/data)
Add permission to read + write with sudo chmod -R ugo+rw data
If you need to use sudo when running mongodb (sudo mongod), that means you don't have read and write permission on the mongodb data folder
Please take following steps:
As other friends mentioned, you should make a directory first for your database data to be stored. This folder could be something like:
C:\mongo-data
From command line navigate to where you have installed mongodb and where mongod.exe resides. In my case the full path is:
C:\Program Files\MongoDB\Server\3.4\bin
From here run mongod.exe and pass it the path to the folder you created in step one using the flag --dbpath as follows:
mongod.exe --dbpath "C:\mongo-data"
Please Note: If you are on windows it is necessary to use double-quotes ("") in the above to run properly.
In this way you will get something like the following:
2017-06-14T12:45:59.892+0430 I NETWORK [thread1] waiting for connections on port 27017
If you use single quotes (' ') on windows, you will get:
2017-06-14T01:13:45.965-0700 I CONTROL [initandlisten] shutting down with code:100
Hope it helps to resolve the issue.
To run Mongo DB demon with mongod command, you should have a database directory, probably you need to run:
mkdir C:\data\db
Also, MongoDB need to have a write permissions for that directory or it should be run with superuser permissions, like sudo mongod.
I kept getting the following error when I tried to start mongodb (on mac os).
"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.
first you have to create data directory where MongoDB stores data. MongoDB’s default data directory path is the absolute path \data\db on the drive from which you start MongoDB.
if you have install in C:/ drive then you have to create data\db directory. for doing this
run command in cmd
C:\>mkdir data\db
To start MongoDB, run mongod.exe.
"C:\Program Files\MongoDB\Server\4.2\bin\mongod.exe" --dbpath="c:\data\db"
The --dbpath option points to your database directory.
Connect to MongoDB.
"C:\Program Files\MongoDB\Server\4.2\bin\mongo.exe"
to check all work good :
show dbs
1.If it shows error (shutting down
with code 100) that means it is not finding the desired
location of file.
1.a If its before macOS Catalina then create directory with
sudo mkdir -p /data/db and give permissions to use it
sudo chown -R id -un /data/db.
1.b if it macOS Catalina onwards then make
sudo mkdir -p /System/Volumes/data/db and give it
permissions
sudo chown -R id -un /System/Volumes/data/db.
2.Starting mongo db brew services run mongodb-community
3.Type mongod or mongod --dbpath /System/Volumes/Data/data/db
4.And if the mongod show error (shutting down with code 48) that
means the port is being already use so you can do two things
4.a Either you change the port of mongod by specifying port
number
mongod --dbpath /System/Volumes/Data/data/db —port 27018.
4.b Or You can kill the process at that port by finding
the process by
sudo lsof -i :27017
and then kill by command
kill -9
5.Repeat the step 2 and 3.
In MacOS:-
If you forgot to give the path of the previously created database while running the mongo server, the above error will appear.
sudo ./mongod --dbpath ../../mongo-data/
Reference
Note :- ./mongod && ../../mongo-data is relative path.
So you can avoid it by configuration in environment variable
Reference
For windows i've got same issue.
The fix was - i need to run command line as administrator.
if you already have the directory, check the dir permissions or try to restart mongo with sudo.
sudo brew services start mongodb
In my case, I got a similar error and it was happening because I had run mongod with the root user and that had created a log file only accessible by the root. I could fix this by changing the ownership from root to the user you normally run mongod from. The log file was in /var/lib/mongodb/journal/
I you are using Virtualbox check your VM.
docker-machine ssh
df -h
Look at dev/sda1 if you do not have any free space this may be due to a large number of images, or containers. you can remove them using "docker rm" and "docker rmi"
This exit code will also be given if you are changing MongoDB versions and the data directory is incompatible, such as with a downgrade. Move the old directory elsewhere, and create a new directory (as per the instructions given in other answers).
Aravind.
It happened with me too because I stopped the MongoDB by the Task Manager.
Creating the C:\data\db folder and starting the MongoDB at C:\Program Files\MongoDB\Server\3.4\bin\mongod.exe worked for me, as cespon suggested, but the MongoDB didn't show any of my Databases previously created.
Then, removing the C:\data\db folder and repairing the installation with the MongoDB installer, I recovered my data and started normally the MongoDB.
(I'm very new with MongoDB, but it helped me solve this problem and recover may previews data).
typed mongod and getting error
Errors:
exception in initAndListen: NonExistentPath: Data directory /data/db not found.,
terminating
shuts down with Code 100
Then try with (create data and db folder with all permission)
mongod --dbpath=/data
use new tab and type mongo.
>use dbs
If still you are facing prob
then you can check for mac catalina: (https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x-tarball/)
for windows: https://docs.mongodb.com/manual/tutorial/install-mongodb-on-windows-unattended/
I run MongoDB on Mac:
Shave:mongodb_simple Logan$ ./bin/mongod -f conf/mongod.conf
about to fork child process, waiting until server is ready for connections.
forked process: 5110
ERROR: child process failed, exited with error number 14
Is that because I shutdown it in wrong way?
You started and probably shutdown mongo in the wrong way.
1. TO START MONGODB
To start mongo in the background type: mongod --dbpath /data/db --fork --logpath /dev/null.
/data/db is the location of the db. If you haven't created one yet => type: mkdir /data/db
--fork means you want to start mongo in the background - deamon.
--logpath /dev/null means you don't want to log - you can change that by replacing /dev/null to a path like /var/log/mongo.log
2. TO SHUTDOWN MONGODB
Connect to your mongo by typing: mongo and then use admin and db.shutdownServer(). Like explain in mongoDB
If this technique doesn't work for some reason you can always kill the process.
Find the mongodb process PID by typing: lsof -i:27017 assuming your mongodb is running on port 27017
Type kill <PID>, replace <PID> by the value you found the previous command.
Check the ownership of the file /tmp/mongodb-27017.sock
It should be mongod. I got same error since it was root:root
For me it was ulimit issue, mongo could not open too many files.
Used ulimit -n 10000.
However as a generic pointer look into mongo logs file, they will tell where to look further. Generally the logs file are in /var/log/mongo.log but look into your mongo config file.
It's because you haven't configured your mongod instance correctly in the config file that you passed to the -f option.
Revisit your config file and make sure eveything is configured correctly.
By changing owner to mongodb for all files under /var/lib/mongodb/ it started working for me:
chown mongodb:mongodb -R /var/lib/mongodb/
This worked for me:
run in terminal
sudo rm -rf mongod.lock
export LC_ALL=C
then
sudo mongod --fork --config /xxxx/xx/mongod.conf --logpath /xxx/log/mongodb/mongodb.log
with me I remove file: /tmp/mongodb-27017.sock
then restart mongod
Just run this and start mongod
rm -f /tmp/mongodb-27017.sock
systemctl start mongod
Check if the mongod is running with pgrep mongod or ps -aef | grep mongod or systemctl status mongod
Stop and restart it to check if the issue gone
if you start mongod with mongod -f /etc/mongod.conf kill it with pkill -9 mongod then start it with mongod -f /etc/mongod.conf
fi you run it a service, use systemctl restart mongod to restart it.
If restart not works, figure out the issue by the /var/log/message and /var/log/mongodb/mongod.log file.
use tail -f /var/log/message and tail -f /var/log/mongodb/mongod.log to check the output when your action.
for example:
1.
Failed to unlink socket file /tmp/mongodb-27017.sock Operation not permitted
delete the sock file with `rm`
2.
WiredTiger error (13) [1596090168:830936][25997:0x7fe22f208b80], wiredtiger_open: __posix_open_file, 672: /data/mongo/WiredTiger.turtle: handle-open: open: Permission denied Raw: [1596090168:830936][25997:0x7fe22f208b80], wiredtiger_open: __posix_open_file, 672: /data/mongo/WiredTiger.turtle: handle-open: open: Permission denied
Failed to start up WiredTiger under any compatibility version
Reason: 13: Permission denied
check the file permission or owner with `ls` then change to the wright permission with `chmod` or right owner with `chown`
I had this same issue, but mine was the system clock being off so my SSL cert was technically invalid. Changing to the current date and time worked date --set "<DD M Y H:M>" Only found this by looking at the mongodb log
I encountered this issue on a GCP managed Compute Engine instance.
As this is the top answer on a Google search for the issue, I'll include what worked for me, and is a documented bug as per MongoDB (jira-link)
On linux systems, if the user running mongod does not have a locale set or the locale is misconfigured, mongod fails to start printing a stack trace.
The issue can be resolved by combining a few steps:
Install the required language packs (ref):
sudo apt-get install language-pack-XX
Run update locale (ref):
sudo update-locale
Restart your session, and check the same mongo command again
IFF the above doesn't work (it didn't for me), just manually add the following to the file at /etc/default/locale (ref):
LC_ALL=en_US.UTF-8
LANG=en_US.UTF-8
Just to admire the absence of those persistent warnings about LC_ALL not being set, run the following:
sudo dpkg-reconfigure locales
That's all, your MongoDB instance should be good to go now!
In my mongodb setup, in order to retain a specific version of mongoDB inline to existing servers and also to avoid having binary files placed under root disk, i changed the path of all mongo binaries in a different directory. i had to use rpm option instead of yum option (as yum installs only the latest version despite of mentioning the specific version).
rpm -ivh --prefix=/apps/mongodb /apps/mongo_rpm_packages/mongodb-org-*.rpm
Note: The default path where the binaries will be placed is /var/lib/mongo.
This approach does not either allow required permission for mongod user or its not provisioned properly and hence, i changed user and group in mongod.service file to root user and managed to successful start the process using:
service start mongod
Use --shutdown
mongod --shutdown
Then
service mongod restart
It work!
https://docs.mongodb.com/manual/tutorial/manage-mongodb-processes/#use-shutdown
Am running MongoDB 2.2 on Ubuntu and if I run:
sudo mongod
I get an error that it can't find /data/db, which is not where the database is. In mongod.conf the database path is specified as the Ubuntu 10gen default /var/lib/mongodb which is where the db is located. Seems like mongod is not finding the conf file. So when I run:
sudo mongod -f /etc/mongodb.conf
The server starts up fine and output is logged to the log file: /var/log/mongodb/mongodb.log. All is happy. I can switch to another shell, log into mongo shell, see the databases and run queries.
So, I cancel out of that and try to run as a service:
> sudo status mongodb
mongodb stop/waiting
> sudo start mongodb
mongodb start/running, process 10468
Looks good so far, but the mongo server did not start. Running another:
> sudo status mongodb
mongodb stop/waiting
> mongo
MongoDB shell version: 2.2.0
connecting to: test
Sat Sep 1 19:07:43 Error: couldn't connect to server 127.0.0.1:27017 src/mongo/shell/mongo.js:91
exception: connect failed
"test" is not the correct database, and nothing appears in the log file.
I am at a loss as to what could be wrong. I checked the upstart scripts and they seem fine. /etc/init/mongodb.conf runs:
mongodb --exec /usr/bin/mongod -- --config /etc/mongodb.conf
OK, this all comes down to permissions, but let's take it step by step. When you run sudo mongod it does not load a config file at all, it literally starts with the compiled in defaults - port 27017, database path of /data/db etc. - that is why you got the error about not being able to find that folder. The "Ubuntu default" is only used when you point it at the config file (if you start using the service command, this is done for you behind the scenes).
Next you ran it like this:
sudo mongod -f /etc/mongodb.conf
If there weren't problems before, then there will be now - you have run the process, with your normal config (pointing at your usual dbpath and log) as the root user. That means that there are going to now be a number of files in that normal MongoDB folder with the user:group of root:root.
This will cause errors when you try to start it as a normal service again, because the mongodb user (which the service will attempt to run as) will not have permission to access those root:root files, and most notably, it will probably not be able to write to the log file to give you any information.
Therefore, to run it as a normal service, we need to fix those permissions. First, make sure MongoDB is not currently running as root, then:
cd /var/log/mongodb
sudo chown -R mongodb:mongodb .
cd /var/lib/mongodb
sudo chown -R mongodb:mongodb .
That should fix it up (assuming the user:group is mongodb:mongodb), though it's probably best to verify with an ls -al or similar to be sure. Once this is done you should be able to get the service to start successfully again.
First confirm that the mongodb user/group has permission to write to both the data directory and log file:
$ sudo chown -R mongodb:mongodb /var/lib/mongodb/.
$ sudo chown -R mongodb:mongodb /var/log/mongodb.log
Start up MongoDB as a Daemon (background process) using the following command:
$ mongod --fork --dbpath /var/lib/mongodb/ --smallfiles --logpath
/var/log/mongodb.log --logappend
To Shut Down MongoDB enter the Mongo CLI, access the admin and issue the shutdown command:
$ ./mongo
> use admin
> db.shutdownServer()
Ref: http://www.mongodb.org/display/DOCS/Starting+and+Stopping+Mongo
I too had the same problem. So I went to cd /var/lib/mongodb/ and deleted the mongod.lock file
Then it worked for me.
After checking all permission in the data, journal and log folders as suggested by #nelsonic, my problem was solved by giving permission to lock file in the /tmp folder
sudo chown mongod:mongod mongodb-27017.sock
I was running it as a AWS Amazon Linux instance.
I figured that out by executing as the mongod user as below, and then, researching the error code. It might be useful for other troubleshooting.
sudo -S -u mongod mongod -f /etc/mongod.conf
Just try this command:
sudo chown mongodb /tmp/mongodb-27017.sock
Nothing worked for me, then I've found that it was a permissions problem on /tmp directory:
sudo chmod 1777 /tmp
sudo chown root:root /tmp
None of the above answers worked for me. I finally figured it out by debugging the init script with:
sudo bash -x /etc/init.d/mongodb start
And seeing it was passing the wrong config path to mongod. I simply changed the line in /etc/init.d/mongodb from "CONF=/etc/mongodb.conf" to "CONF=/etc/mongod.conf". Version 2 uses the former, and installing version 3 added /etc/mongod.conf with the new format but apparently did not update the init script.
UPDATE: I now have a much stranger problem where the init script works, but only if I run it with "sudo bash -x /etc/init.d/mongodb start" and not with "sudo service mongodb start". Same thing for stop.
My mongodb was starting when launched from the command line as the mongod user, but not as a service with User=mongod.
After an hour checking permissions, definition of the service, sockets... it was SElinux !
In /etc/selinux/config I switched from enforcing to permissive and reboot. It is now ok.
After none of the above answers worked for me, deleting my log file brought Mongo back to life.
These days this error can occur if you've updated mongod and you are running and old database. Mongod will be using the wiredTiger engine by default and you'll have a mmapv1 database
edit the engine setting in /etc/mongod.conf
# engine: wiredTiger
engine: mmapv1
Careful - YAML is whitespace sensitive
journalctl/systemd won't see this problem. Check the mongod log in /var/log/mongodb/mongod.log
I presume you can convert the database with something like the steps outlined here
https://docs.mongodb.com/manual/tutorial/change-standalone-wiredtiger/
I can't seem to connect to Mongo DB, which I've installed as a Windows Service on my local machine. I've also built a little WPF application which communicates with MongoDB.
The errormessage:
Error: couldn't connect to server 127.0.0.1 shell/mongo.js:8
4
exception: connect failed
Unclean shutdown detected.
You should launch it with --repair flag.
mongod --repair
After repair is finished, stop this one and launch it normally. Documentation on --repair option.
Quicker:
sudo rm /data/db/mongod.lock
sudo mongod --dbpath /data/db --repair
sudo mongod --dbpath /data/db
If you do a repair operation as root user be sure that afterwards all db files are owned by the mongodb user, otherwise mongodb will not start
chown -R mongodb:mongodb /data/db
rm /data/db/mongod.lock
/etc/init.d/mongodb start
$ mongo
> use dbname
> db.repairDatabase()
Note --repair functionality is also available in the shell with the db.repairDatabase() helper for the repairDatabase command.
See also http://docs.mongodb.org/manual/tutorial/recover-data-following-unexpected-shutdown/:
If you are using the official MongoDB repo on Ubuntu instead of the default packages, the accepted answer will not work.
The mongod command, by default, uses /data/db as the default dbPath config setting whereas /etc/mongodb.conf uses /var/lib/mongodb as the path. Therefore if you just do mongod --repair, it will try to repair a database at /data/db, which is the wrong path.
I also found that if you execute mongod as the root user, any files created will be owned by root, so you need to execute the repair with the mongodb user.
This is what I eventually did to get it to work:
sudo chown -R mongodb: /var/lib/mongodb # Just to make sure permissions are correct
sudo -u mongodb mongod --dbpath /var/lib/mongodb --repair
sudo service mongodb start
Write the command as below and I think it will solve the problem:
cd data/
rm -rf mongod.lock*
cd ..
mongod --repair
./mongod
Follow this step to restart your mondoDB as fresh
1, Kill all the processes that mongod is running
to do this forcefully kill each process that are running on port 27017(default port for mongodb)
lsof -n -i4TCP:27017 Where 27017 is the port number the process is
running at
this returns the process id(PID) and run
kill -9 "PID" Replace PID with the number you get after running the
first command
2, restart mongo using mongod command