Frequently asked questions for Systemd

When systemd units are changed, a 'systemctl daemon-reload' might be needed. Need to know why? We can find the relevant units with some scripting.

Systemd units can be enabled or disabled based on multiple factors, such as meeting specific dependencies. Learn how to see if a systemd service is enabled.

Want to know if systemd is used on your Linux distribution? Learn how to quickly confirm that systemd is being used as your system and service manager.

Learn how to use the journalctl command to query the disk usage of the journal logs and how to clean or trim them by number, size, or age.

Want to disable a service or specific systemd unit? Use the systemctl command to configure units and disable it on boot or completely.

The background color of run0, part of systemd, can be changed with the '--background' option. This way another color can be configured instead of its default.

Learn how to define the maximum size that the systemd journal daemon may use on Linux systems for storing journals and limit its disk usage.

Linux systems using systemd can use the systemctl command to list all available and active service units. Learn how to use the command with these tips.

Systemd units have their own configuration file. The systemctl 'edit' command can be used to override settings of a systemd unit, including services.

Services that are controlled with systemd can be reloaded or restarted depending on their configuration. Use systemctl to perform the related restart tasks.

When changes are made to systemd unit files, such as service files, the systemd daemon needs to be reloaded. Use the daemon-reload subcommand to reload.

Linux systems using systemd, use timers to schedule a repeating task. Learn how to configure these systemd timer units and fine-tune them.

Systemd timers are scheduled tasks for Linux systems. Show timer information with the systemctl command such as status, last execution, and its schedule.

Linux systems using systemd have the systemctl command available to show all active systemd units of one particular type using the '--type' option.

Linux systems using systemd have the systemctl command available that can be used to show all service units, including a filter for only those that are enabled.

Want to find all masked unit files on a Linux system running systemd? In this article we show how to do this with systemctl and query those units.

Linux systems using systemd store kernel events in the journal logs. Show these entries with the '--dmesg' or '-k' option, optionally with a date.

Linux systems with systemd store log entries in a journal. Limit the number of log entries from the journal by filtering journalctl output by unit.

The systemctl command can be used to show the memory usage of a service managed by systemd. Use the subcommand 'status' to find the details about a unit.

Learn how to continuously show new log entries on Linux systems using systemd with the journalctl command. The behavior will be like the 'tail -f' command.

Linux systems with systemd use journal to store log entries. Learn how to filter these journal entries by specifying a date or time interval.

Linux systems using systems may use the systemctl command to query services. Use a filter to reduce its output and only show all running services.

Linux systems using systemd can use the systemctl command to show the all applied unit settings. This can be used on units like a service.

The systemctl command can be used to show all available systemd unit types. Here is how to find the available types and to select them.

The systemctl command has the list-dependencies option to show dependencies between units. But there are more options to query a little bit more information.

Limit the output from journalctl by defining the number of lines you want to see by using the '-n' option, optionally with the service itself.

Use the journalctl command to show the size of the systemd journal logs. In this article we look how journalctl vacuuming works.

The version of systemd defines the available features and commands that is has to offer. Learn how to query the systemd version number.

Linux systems running systemd can use the timedatectl command to show time synchronization details. Learn how to use it, including its subcommands.

Systemd units can be filtered using the SystemCallFilter setting. Learn how to see what syscalls are part of a particular syscall filter set.

Systemd units can be configured to contain environment variables and passed along to the underlying application. Learn how to configure this unit setting.

Want to check the system for failed systemd units? In this article we show how to do this with systemctl and query the units with a failure state.

Linux systems using systemd store an unique identifier called the machine ID. Find this value using the hostnamectl command that comes with systemd.

Systemd can start and enable a unit, such as a service at the same time. Learn how to use systemctl more efficiently to achieve this this action.

Systemd allows customizing services with overrides. Learn how to edit an existing systemd service unit with the systemctl edit command.

Learn how to troubleshoot issues with systemd units by verifying the unit files for any errors. One of the tools to help is systemd-analyze.

When making changes to systemd unit files, you may need to use systemctl daemon-reload. This article explains why and what happens next.

Systemd units that are in a masked state are administratively disabled. While being in this state, they can not be started until they are unmasked.

Systemd units define resources, such as a service, path, socket, or timer. They are usually managed with the systemctl command.

Systemd is a system and service manager on Linux distributions to start, stop, and monitor system services. Learn about systemd is and the main components.

Want to disable a systemd service unit, but wondering the difference between systemctl disable and systemctl mask? This article explains the differences.

Troubleshoot issues like units being marked as 'not-found' in the output of systemctl list-units. This articles help with the steps to take.