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While systemd started as an init system, over time it has evolved into a comprehensive service manager, handling system initialization, service orchestration, logging, network configuration, time sync, user sessions, hardware event management, and more. Here are some core systemd services available out of the box on today’s Linux systems:
1. systemd-journald: Collects and stores logging data.
2. systemd-logind: Manages user logins and seats.
3. systemd-networkd: Handles network configuration.
4. systemd-resolved: Provides network name resolution.
5. systemd-timesyncd: Synchronizes system time across the network.
- systemd-udevd: Manages device events and dynamically creates device nodes.
For a detailed guide and high-resolution PDF books on Linux and networking, visit study-notes.org.
Practice Verified Codes and Commands
1. Check the status of a systemd service:
sudo systemctl status <service-name>
2. Start a systemd service:
sudo systemctl start <service-name>
- Enable a systemd service to start on boot:
sudo systemctl enable <service-name>
4. View logs for a specific service:
sudo journalctl -u <service-name>
5. List all active systemd services:
systemctl list-units --type=service --state=running
6. Restart a systemd service:
sudo systemctl restart <service-name>
7. Reload systemd manager configuration:
sudo systemctl daemon-reload
8. Disable a systemd service:
sudo systemctl disable <service-name>
- Mask a systemd service (prevent it from being started):
sudo systemctl mask <service-name>
10. Unmask a systemd service:
sudo systemctl unmask <service-name>
What Undercode Say
Systemd has become an integral part of modern Linux systems, offering a wide range of functionalities beyond just system initialization. Its ability to manage services, logs, network configurations, and more makes it a powerful tool for system administrators. The commands provided above are essential for managing systemd services effectively. For instance, `systemctl status` allows you to monitor the health of a service, while `journalctl -u` helps in troubleshooting by providing detailed logs. Enabling and disabling services with `systemctl enable` and `systemctl disable` ensures that only necessary services run at boot, optimizing system performance. Additionally, `systemctl mask` and `unmask` provide control over service activation, preventing unwanted services from starting. For those looking to deepen their understanding, resources like study-notes.org offer comprehensive guides and infographics. Mastering these commands and concepts will significantly enhance your ability to manage and troubleshoot Linux systems efficiently.
References:
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