MongoDB service autostart failed on Ubuntu 18.04

[bala_murugan]

Hi All,

We have install mongodb in Ubuntu 18.04 LTS. The system was working fine. mongodb service was auto started during reboot.

We ran
sudo mongod --repair , After this the mongod service is not autostarting and

1. sudo systemctl enable mongod
2. sudo systemctl start mongod is not working
   But When I execute sudo mongod --config /etc/mongodb.conf, Mongo db works well.

We want to autostart mongodb using systemctl. Kindly guide me to fix the auto start issue.

Regards,
Bala

[chris (Chris Dellaway)]

You have a few places to look for information.

First off systemctl status mongod may have some useful messages .
Next you have journalctl -u mongod.
If mongod managed to start up enough to start logging then you will find additional logs in /var/log/mongod

This mostly assume installation and default(ish) config from the official mongodb repository and packages.

@bala_murugan

But When I execute sudo mongod --config /etc/mongodb.conf , Mongo db works well.

This is likely your issue, mongod will usually run under the account mongodb. If you have run it via sudo some files and or directories are owned by root. One of the above commands will produce logs to that effect.

You will have to recursively change ownership of the datadirectory and the log directory.
chown -R mongodb: /var/lib/mongodb /var/log/mongodb

[michael_hoeller (Michael Höller)]

Hi @bala_murugan
one word of warning: even when it sounds so simple to run the mongod as root. This will “fix” your problems only for short. It is absolutely not recommended to run mongod as root. Please follow the hints from Chris.
Michael