System and Service Manager
https://www.freedesktop.org/wiki/Software/systemd
systemd is a system and service manager that runs as PID 1 and starts
the rest of the system. It provides aggressive parallelization
capabilities, uses socket and D-Bus activation for starting services,
offers on-demand starting of daemons, keeps track of processes using
Linux control groups, maintains mount and automount points, and
implements an elaborate transactional dependency-based service control
logic. systemd supports SysV and LSB init scripts and works as a
replacement for sysvinit. Other parts of this package are a logging daemon,
utilities to control basic system configuration like the hostname,
date, locale, maintain a list of logged-in users, system accounts,
runtime directories and settings, and daemons to manage simple network
configuration, network time synchronization, log forwarding, and name
resolution.
| Command | Description |
|---|---|
| busctl | Introspect the bus |
| coredumpctl | Retrieve and process saved core dumps and metadata |
| hostnamectl | Control the system hostname |
| init | alias for systemd |
| journalctl | Query the systemd journal |
| localectl | Control the system locale and keyboard layout settings |
| loginctl | Control the systemd login manager |
| networkctl | Query the status of network links |
| portablectl | Attach, detach or inspect portable service images |
| resolvconf | alias for resolvectl |
| resolvectl | Resolve domain names, IPV4 and IPv6 addresses, DNS resource records, and... |
| systemctl | Control the systemd system and service manager |
| systemd | systemd system and service manager |
| systemd-analyze | Analyze and debug system manager |
| systemd-ask-password | Query the user for a system password |
| systemd-cat | Connect a pipeline or program's output with the journal |
| systemd-cgls | Recursively show control group contents |
| systemd-cgtop | Show top control groups by their resource usage |
| systemd-delta | Find overridden configuration files |
| systemd-detect-virt | Detect execution in a virtualized environment |
| systemd-escape | Escape strings for usage in systemd unit names |
| systemd-firstboot | Initialize basic system settings on or before the first boot-up of a system |
| systemd-firstboot.service | alias for systemd-firstboot |
| systemd-id128 | Generate and print sd-128 identifiers |
| systemd-inhibit | Execute a program with an inhibition lock taken |
| systemd-machine-id-setup | Initialize the machine ID in /etc/machine-id |
| systemd-mount | Establish and destroy transient mount or auto-mount points |
| systemd-notify | Notify service manager about start-up completion and other daemon status changes |
| systemd-path | List and query system and user paths |
| systemd-run | Run programs in transient scope units, service units, or path-, socket-, or... |
| systemd-socket-activate | Test socket activation of daemons |
| systemd-tty-ask-password-agent | List or process pending systemd password requests |
| systemd-umount | alias for systemd-mount |
| timedatectl | Control the system time and date |
| File | Description |
|---|---|
| binfmt.d | Configure additional binary formats for executables at boot |
| coredump.conf | Core dump storage configuration files |
| coredump.conf.d | alias for coredump.conf |
| crypttab | Configuration for encrypted block devices |
| dnssec-trust-anchors.d | DNSSEC trust anchor configuration files |
| environment.d | Definition of user session environment |
| hostname | Local hostname configuration file |
| journald.conf | Journal service configuration files |
| journald.conf.d | alias for journald.conf |
| loader.conf | Configuration file for systemd-boot |
| locale.conf | Configuration file for locale settings |
| localtime | Local timezone configuration file |
| logind.conf | Login manager configuration files |
| logind.conf.d | alias for logind.conf |
| machine-id | Local machine ID configuration file |
| machine-info | Local machine information file |
| networkd.conf | Global Network configuration files |
| networkd.conf.d | alias for networkd.conf |
| os-release | Operating system identification |
| resolved.conf | Network Name Resolution configuration files |
| resolved.conf.d | alias for resolved.conf |
| sysctl.d | Configure kernel parameters at boot |
| system.conf.d | alias for systemd-system.conf |
| systemd-system.conf | System and session service manager configuration files |
| systemd-user.conf | alias for systemd-system.conf |
| systemd.automount | Automount unit configuration |
| systemd.device | Device unit configuration |
| systemd.dnssd | DNS-SD configuration |
| systemd.exec | Execution environment configuration |
| systemd.kill | Process killing procedure configuration |
| systemd.link | Network device configuration |
| systemd.mount | Mount unit configuration |
| systemd.negative | alias for dnssec-trust-anchors.d |
| systemd.netdev | Virtual Network Device configuration |
| systemd.network | Network configuration |
| systemd.nspawn | Container settings |
| systemd.path | Path unit configuration |
| systemd.positive | alias for dnssec-trust-anchors.d |
| systemd.preset | Service enablement presets |
| systemd.resource-control | Resource control unit settings |
| systemd.scope | Scope unit configuration |
| systemd.service | Service unit configuration |
| systemd.slice | Slice unit configuration |
| systemd.socket | Socket unit configuration |
| systemd.swap | Swap unit configuration |
| systemd.target | Target unit configuration |
| systemd.timer | Timer unit configuration |
| systemd.unit | Unit configuration |
| sysusers.d | Declarative allocation of system users and groups |
| tmpfiles.d | Configuration for creation, deletion and cleaning of volatile and temporary... |
| user-runtime-dir@.service | alias for user@.service |
| user.conf.d | alias for systemd-system.conf |
| user@.service | System units to manage user processes |
| Name | Description |
|---|---|
| bootup | System bootup process |
| daemon | Writing and packaging system daemons |
| file-hierarchy | File system hierarchy overview |
| kernel-command-line | Kernel command line parameters |
| sd-boot | alias for systemd-boot |
| systemd-boot | A simple UEFI boot manager |
| systemd.directives | Index of configuration directives |
| systemd.environment-generator | systemd environment file generators |
| systemd.generator | systemd unit generators |
| systemd.index | List all manpages from the systemd project |
| systemd.journal-fields | Special journal fields |
| systemd.offline-updates | Implementation of offline updates in systemd |
| systemd.special | Special systemd units |
| systemd.syntax | General syntax of systemd configuration files |
| systemd.time | Time and date specifications |
| Command | Description |
|---|---|
| 30-systemd-environment-d-generator | alias for systemd-environment-d-generator |
| halt | Halt, power-off or reboot the machine |
| nss-myhostname | Provide hostname resolution for the locally configured system hostname. |
| nss-resolve | Provide hostname resolution via systemd-resolved.service |
| nss-systemd | Provide UNIX user and group name resolution for dynamic users and groups. |
| pam_systemd | Register user sessions in the systemd login manager |
| poweroff | alias for halt |
| reboot | alias for halt |
| runlevel | Print previous and current SysV runlevel |
| shutdown | Halt, power-off or reboot the machine |
| systemd-ask-password-console.path | alias for systemd-ask-password-console.service |
| systemd-ask-password-console.service | Query the user for system passwords on the console and via wall |
| systemd-ask-password-wall.path | alias for systemd-ask-password-console.service |
| systemd-ask-password-wall.service | alias for systemd-ask-password-console.service |
| systemd-binfmt | alias for systemd-binfmt.service |
| systemd-binfmt.service | Configure additional binary formats for executables at boot |
| systemd-bless-boot-generator | Pull systemd-bless-boot.service into the initial boot transaction when boot... |
| systemd-bless-boot.service | Mark current boot process as successful |
| systemd-boot-check-no-failures.service | verify that the system booted up cleanly |
| systemd-coredump | Acquire, save and process core dumps |
| systemd-coredump.socket | alias for systemd-coredump |
| systemd-coredump@.service | alias for systemd-coredump |
| systemd-debug-generator | Generator for enabling a runtime debug shell and masking specific units at boot |
| systemd-environment-d-generator | Load variables specified by environment.d |
| systemd-fsck | alias for systemd-fsck@.service |
| systemd-fsck-root.service | alias for systemd-fsck@.service |
| systemd-fsck@.service | File system checker logic |
| systemd-fstab-generator | Unit generator for /etc/fstab |
| systemd-getty-generator | Generator for enabling getty instances on the console |
| systemd-halt.service | System shutdown logic |
| systemd-hostnamed | alias for systemd-hostnamed.service |
| systemd-hostnamed.service | Host name bus mechanism |
| systemd-initctl | alias for systemd-initctl.service |
| systemd-initctl.service | /dev/initctl compatibility |
| systemd-initctl.socket | alias for systemd-initctl.service |
| systemd-journald | alias for systemd-journald.service |
| systemd-journald-audit.socket | alias for systemd-journald.service |
| systemd-journald-dev-log.socket | alias for systemd-journald.service |
| systemd-journald.service | Journal service |
| systemd-journald.socket | alias for systemd-journald.service |
| systemd-kexec.service | alias for systemd-halt.service |
| systemd-localed | alias for systemd-localed.service |
| systemd-localed.service | Locale bus mechanism |
| systemd-logind | alias for systemd-logind.service |
| systemd-logind.service | Login manager |
| systemd-machine-id-commit.service | Commit a transient machine ID to disk |
| systemd-networkd | alias for systemd-networkd.service |
| systemd-networkd-wait-online | alias for systemd-networkd-wait-online.service |
| systemd-networkd-wait-online.service | Wait for network to come online |
| systemd-networkd.service | Network manager |
| systemd-portabled | alias for systemd-portabled.service |
| systemd-portabled.service | Portable service manager |
| systemd-poweroff.service | alias for systemd-halt.service |
| systemd-rc-local-generator | Compatibility generator for starting /etc/rc.local and /usr/sbin/halt.local... |
| systemd-reboot.service | alias for systemd-halt.service |
| systemd-resolved | alias for systemd-resolved.service |
| systemd-resolved.service | Network Name Resolution manager |
| systemd-run-generator | Generator for invoking commands specified on the kernel command line as system... |
| systemd-shutdown | alias for systemd-halt.service |
| systemd-socket-proxyd | Bidirectionally proxy local sockets to another (possibly remote) socket. |
| systemd-sysctl | alias for systemd-sysctl.service |
| systemd-sysctl.service | Configure kernel parameters at boot |
| systemd-system-update-generator | Generator for redirecting boot to offline update mode |
| systemd-sysusers | Allocate system users and groups |
| systemd-sysusers.service | alias for systemd-sysusers |
| systemd-sysv-generator | Unit generator for SysV init scripts |
| systemd-time-wait-sync | alias for systemd-time-wait-sync.service |
| systemd-time-wait-sync.service | Wait Until Kernel Time Synchronized |
| systemd-timedated | alias for systemd-timedated.service |
| systemd-timedated.service | Time and date bus mechanism |
| systemd-tmpfiles | Creates, deletes and cleans up volatile and temporary files and directories |
| systemd-tmpfiles-clean.service | alias for systemd-tmpfiles |
| systemd-tmpfiles-clean.timer | alias for systemd-tmpfiles |
| systemd-tmpfiles-setup.service | alias for systemd-tmpfiles |
| systemd-update-done | alias for systemd-update-done.service |
| systemd-update-done.service | Mark /etc and /var fully updated |
| systemd-update-utmp | alias for systemd-update-utmp.service |
| systemd-update-utmp-runlevel.service | alias for systemd-update-utmp.service |
| systemd-update-utmp.service | Write audit and utmp updates at bootup, runlevel changes and shutdown |
| systemd-user-sessions | alias for systemd-user-sessions.service |
| systemd-user-sessions.service | Permit user logins after boot, prohibit user logins at shutdown |
| systemd-veritysetup | alias for systemd-veritysetup@.service |
| systemd-veritysetup-generator | Unit generator for integrity protected block devices |
| systemd-veritysetup@.service | Disk integrity protection logic |
| systemd-volatile-root | alias for systemd-volatile-root.service |
| systemd-volatile-root.service | Make the root file system volatile |
| telinit | Change SysV runlevel |