Managing Services with systemctl
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In this lesson, you will learn how to manage system services in Linux using systemctl, a command-line utility for controlling the systemd system and service manager. Our focus will be on managing NGINX, a popular web server and reverse proxy service, using systemd.
Objectives
By the end of this lesson, you will understand how to:
- Start, stop, and restart the NGINX service.
- Enable and disable NGINX to start on boot.
- Check the status of NGINX.
- Reload NGINX configurations.
Starting, Stopping, and Restarting NGINX
Starting NGINX
To start the NGINX service immediately:
sudo systemctl start nginxStopping NGINX
To stop the NGINX service:
sudo systemctl stop nginxRestarting NGINX
To restart the NGINX service (useful for reloading it with the latest configuration):
sudo systemctl restart nginxEnabling and Disabling NGINX
Enabling NGINX
To enable NGINX to start automatically at boot:
sudo systemctl enable nginxDisabling NGINX
To prevent NGINX from starting automatically at boot:
sudo systemctl disable nginxChecking the Status of NGINX
To check the status of NGINX, including whether it is active, enabled, and its recent logs:
sudo systemctl status nginxReloading NGINX Configurations
If you've made configuration changes to NGINX and you don't want to restart the service completely, you can reload the configuration:
sudo systemctl reload nginxManaging All Services
To list all services that systemd knows about, whether active or not:
sudo systemctl list-unit-files --type=serviceBest Practices
- Always check the status of NGINX after starting, stopping, or restarting to ensure it's in the desired state.
- When enabling or disabling services like NGINX, consider the impact on the system's performance and boot time.
- Use the reload function judiciously to apply configuration updates to NGINX without disrupting the service.
Conclusion
systemctl is a powerful tool that provides comprehensive control over services in Linux systems using systemd. Understanding how to manage services like NGINX with systemctl is essential for system administrators and users who want to ensure their web services are running efficiently and securely. That is all you need to learn in this lesson! See you in the next one.
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