MongoDB: special error occurred: 100

Question

I just installed "mongodb" on Windows at startup, the following error appears

A Special Service Error: 100

Any suggestions?

Answer 1

The reason for this error message is that you already have a different process installed. In my case, it was the mongod.exe file that I opened in CMD, when I closed it and restarted the MongoDB launch command, it successfully connected. BTW I am using the current build of Windows 10 as of July 2017 with MongoDB 3.4

Answer 2

Check your Mongo log in the / data / log folder (which you should have created during installation), there might be a solution.

I had this problem, I checked the system event log, which gave me the following:

The MongoDB service terminated with the following service-specific error: Cannot create another system semaphore. 

When I checked the log I found this:

 Unable to create/open lock file: c:\data\db\mongod.lock The process cannot access the file because it is being used by another process.. Is a mongod instance already running? 

It turns out that I started the process manually in another command window so that it could not start it again. You may have another problem, but the journal should tell you what is happening!

Answer 3

For me, some directories that I specified for the db and log configuration file were not created automatically.

 dbpath=\data\db logpath=\data\log\mongo.log 

so I created them manually and then ran the command again and the service started.

I am using v3.4.9 om Windows 10

Answer 4

Try the following commands as an administrator at the comment prompt.

• mongod --repair

• mongod --remove

then, like @Yahya, specify the path to the log,

3. mongod --install --logpath C:\data\db\log\mongo.log

4. net start mongodb

Hope this helps.