How to restart a NoSQL Database service like MongoDB?

To restart a MongoDB service, use the systemctl command on modern Linux systems. MongoDB runs as a system service called mongod that can be managed through systemd service management tools.

Syntax

sudo systemctl restart mongod
sudo systemctl status mongod
sudo systemctl enable mongod

Method 1: Using systemctl (Recommended)

Check the current status of MongoDB service ?

sudo systemctl status mongod

mongod.service - MongoDB Database Server
   Loaded: loaded (/lib/systemd/system/mongod.service; disabled; vendor preset: enabled)
   Active: inactive (dead)
   Docs: https://docs.mongodb.org/manual

Restart the MongoDB service ?

sudo systemctl restart mongod

Verify the service is running ?

sudo systemctl status mongod

mongod.service - MongoDB Database Server
   Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2022-10-11 07:45:50 HST; 7s ago
   Docs: https://docs.mongodb.org/manual
   Main PID: 124287 (mongod)
   Memory: 135.4M
   CGroup: /system.slice/mongod.service
   ??154987 /usr/bin/mongod --config /etc/mongod.conf

Method 2: Using Legacy service Command

For older systems or compatibility, use the service wrapper ?

sudo service mongod restart
sudo service mongod status

Enable Auto-start on Boot

Configure MongoDB to start automatically when the system boots ?

sudo systemctl enable mongod

Created symlink /etc/systemd/system/multi-user.target.wants/mongod.service ? /lib/systemd/system/mongod.service.

Common systemctl Commands

Conclusion

Use systemctl restart mongod to restart MongoDB on modern Linux systems. Always verify the service status after restarting and consider enabling auto-start for production environments using systemctl enable mongod.