Systemd
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Systemd is used to manage the boot process and startup of Linux systems. It aims to boot the system faster by running startup tasks in parallel rather than sequentially. The main commands to interact with Systemd are systemctl to manage units/services, systemd-analyze to analyze the boot process duration and components, and the configuration files are located in /etc/systemd and /usr/lib/systemd/system.
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বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
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Systemd
- 1. Systemd
- 2. Systemd • Systemd makes a server boot quicker because it uses fewer scripts and tries to run more tasks in parallel • Systemd calls them units (to get a better understanding about the problems Systemd solves • The global Systemd configuration is stored in the /etc/systemd directory. • Service configuration files are located in the /usr/lib/systemd/system directory.
- 3. • To get the current release of Systemd, type:
- 4. Boot Process • Systemd primary task is to manage the boot process and provides information about it. To get the boot process duration, type Systemd-analyze • To get the time spent by each task during the boot process, type: Systemd-analyze blame
- 5. • To get the list of the critical chain of tasks during the boot process (any additional delay of these tasks would cause an increase of the overall boot time), type: Systemd-analyze critical-chain
- 6. systemctl and systemd units • The systemctl command is used to manage different types of systemd objects, called units. • A list of available unit types can be displayed with systemctl - t help
- 7. • Query the state of all units to verify a system startup systemctl Query the state of only the service units. systemctl --type=service The status argument may also be used to determine if a particular unit is active and show if the unit is enabled to start at boot time systemctl is-active sshd.service systemctl is-enabled sshd.service
- 8. • List the active state of all loaded units. Optionally, limit the type of unit. • The --all option will add inactive units systemctl list-units --type=service systemctl list-units --type=service --all