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I am getting errors starting Mongod v3.0.15 in Debian linux. I had changed the /etc/mongod.conf file to use smallFiles by adding mmapv1: smallFiles: true to the storage options.

I now get the following error when I execute $mongod --config /etc/mongod.conf:

ib1:/ 514 $ mongod --config /etc/mongod.conf

2017-10-03T12:14:21.183-0500 F CONTROL Failed global initialization: FileNotOpen Failed to open "/var/log/mongodb/mongod.log"

The mongod.log file exists, and it is also defined in the mongod.conf file as in that directory.

I am able to open the /var/log/mongodb/mongod.log file myself in the shell. It hasn't been written to in a long time (months) curiously.

Any ideas?

Thanks very much, Karen

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  • Is mongo already/still running (is the file locked by something)?
    – Cody Geisler
    Commented Oct 3, 2017 at 18:04
  • No, it's not already running. I'm the only one using it. I have also tried restarting the server with no luck. Thanks.
    – Karen A.
    Commented Oct 3, 2017 at 18:35
  • What is the permission for mongod.log ?
    – TheDataGuy
    Commented Oct 3, 2017 at 18:51
  • ib1:~ 504 $ ls -l /var/log/mongodb/mongod.log -rw-r--r-- 1 mongodb mongodb 39858 Oct 3 13:34 /var/log/mongodb/mongod.log
    – Karen A.
    Commented Oct 3, 2017 at 18:59

2 Answers 2

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You may need to change the permissions for the parents directory /var/log/ as the user running the mongod instance might not have access to it. The below code should do it

sudo chmod 755 /var/log
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  1. cd /var/log
  2. sudo mkdir -m 777 mongodb
  3. sudo service mongod start
  4. sudo service mongod status

Hopefully that will do!

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