Control Services and Daemons - RHCSA (RH124).pdf
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The document provides an overview of managing services and daemons in Linux using the systemd init system, which is responsible for starting and stopping these background processes. It includes various commands for checking the status, starting, stopping, enabling, disabling, masking, and unmasking services. Systemd is highlighted as the most common init system in modern Linux distributions, ensuring efficient service management.
Control Services and Daemons - RHCSA (RH124).pdf
- 2. Services ● OS components that manage daemons, allowing control over their current state (start, stop, or restart) Daemons ● Background processes that start automatically at boot and run continuously until stopped or the system shuts down Managing services and daemons Services and daemons run in the background and are managed by the init system with systemd
- 4. Init system systemd ● First process that starts when a system boots up ● Handles starting and stopping services during the boot and shutdown processes ● Most common init system in modern Linux distributions, designed to manage services and daemons more efficiently ● Parent process of most of the daemons
- 5. To verify systemd is installed in system ● Command: systemctl--version To check all the available services running in the system ● Command: systemctl list-units--type=service
- 6. To list all the services and daemons including the inactive ones ● Command: systemctl--all Check the status of specific service ● Command: systemctl status <service-name>
- 7. To stop a particular service ● Command: systemctl stop <service-name> To start a particular service ● Command: systemctl start sshd.service
- 8. For restarting a particular service ● Command: systemctl restart <service-name> To reload a particular service ● Command: systemctl reload <service-name>
- 9. To enable a particular service ● Command: systemctl enable <service-name> To verify if a service is enabled or not ● Command: systemctl is-enabled <service-name>
- 10. For disabling a particular service ● Command: systemctl disable <service-name> Masking a particular service ● Command: systemctl mask <service-name> Note: Masking a service means preventing it from being started, either manually or automatically, until it is unmasked
- 11. To unmask a service ● Command: systemctl unmask <service-name>