Execute systemctl command asynchronously and do not wait for its completion.
Use --no-block parameter to request asynchronous behavior.
Inspect service status.
$ sudo systemctl status sssd
● sssd.service - System Security Services Daemon
Loaded: loaded (/lib/systemd/system/sssd.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2021-10-03 17:00:21 CEST; 8h ago
Main PID: 1827 (sssd)
Tasks: 4 (limit: 1105)
Memory: 47.8M
CPU: 1.538s
CGroup: /system.slice/sssd.service
├─1827 /usr/sbin/sssd -i --logger=files
├─1828 /usr/libexec/sssd/sssd_be --domain octocat.lab --uid 0 --gid 0 --logger=files
├─1829 /usr/libexec/sssd/sssd_nss --uid 0 --gid 0 --logger=files
└─1830 /usr/libexec/sssd/sssd_pam --uid 0 --gid 0 --logger=files
Oct 03 17:00:21 ad.octocat.lab systemd[1]: Starting System Security Services Daemon...
Oct 03 17:00:21 ad.octocat.lab sssd[1827]: Starting up
Oct 03 17:00:21 ad.octocat.lab sssd_be[1828]: Starting up
Oct 03 17:00:21 ad.octocat.lab sssd_nss[1829]: Starting up
Oct 03 17:00:21 ad.octocat.lab sssd_pam[1830]: Starting up
Oct 03 17:00:21 ad.octocat.lab systemd[1]: Started System Security Services Daemon.
Oct 03 18:32:26 ad.octocat.lab sssd_be[1828]: Backend is online
Oct 03 21:18:54 ad.octocat.lab sssd_be[1828]: Backend is offline
Oct 03 21:25:23 ad.octocat.lab sssd_be[1828]: Backend is online
Execute restart operation asynchronously to not wait for its completion.
$ sudo systemctl restart sssd --no-block;
Command will exit immediately, so you will notice different states as it is restarted.
$ sudo systemctl status sssd
● sssd.service - System Security Services Daemon
Loaded: loaded (/lib/systemd/system/sssd.service; enabled; vendor preset: enabled)
Active: deactivating (stop-sigterm) since Mon 2021-10-04 01:09:11 CEST; 6ms ago
Main PID: 1827 (sssd)
Tasks: 1 (limit: 1105)
Memory: 29.3M
CPU: 1.546s
CGroup: /system.slice/sssd.service
└─1827 [sssd]
Oct 03 17:00:21 ad.octocat.lab sssd[1827]: Starting up
Oct 03 17:00:21 ad.octocat.lab sssd_be[1828]: Starting up
Oct 03 17:00:21 ad.octocat.lab sssd_nss[1829]: Starting up
Oct 03 17:00:21 ad.octocat.lab sssd_pam[1830]: Starting up
Oct 03 17:00:21 ad.octocat.lab systemd[1]: Started System Security Services Daemon.
Oct 03 18:32:26 ad.octocat.lab sssd_be[1828]: Backend is online
Oct 03 21:18:54 ad.octocat.lab sssd_be[1828]: Backend is offline
Oct 03 21:25:23 ad.octocat.lab sssd_be[1828]: Backend is online
Oct 04 01:09:11 ad.octocat.lab sssd_be[1828]: Shutting down (status = 0)
Oct 04 01:09:11 ad.octocat.lab systemd[1]: Stopping System Security Services Daemon...
$ sudo systemctl status sssd
● sssd.service - System Security Services Daemon
Loaded: loaded (/lib/systemd/system/sssd.service; enabled; vendor preset: enabled)
Active: activating (start) since Mon 2021-10-04 01:09:11 CEST; 8ms ago
Main PID: 5752 (sssd)
Tasks: 1 (limit: 1105)
Memory: 288.0K
CPU: 1ms
CGroup: /system.slice/sssd.service
└─5752 /usr/sbin/sssd -i --logger=files
Oct 04 01:09:11 ad.octocat.lab systemd[1]: Starting System Security Services Daemon...
$ sudo systemctl status sssd
● sssd.service - System Security Services Daemon
Loaded: loaded (/lib/systemd/system/sssd.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2021-10-04 01:09:11 CEST; 6s ago
Main PID: 5752 (sssd)
Tasks: 4 (limit: 1105)
Memory: 46.0M
CPU: 327ms
CGroup: /system.slice/sssd.service
├─5752 /usr/sbin/sssd -i --logger=files
├─5755 /usr/libexec/sssd/sssd_be --domain octocat.lab --uid 0 --gid 0 --logger=files
├─5756 /usr/libexec/sssd/sssd_nss --uid 0 --gid 0 --logger=files
└─5757 /usr/libexec/sssd/sssd_pam --uid 0 --gid 0 --logger=files
Oct 04 01:09:11 ad.octocat.lab systemd[1]: Starting System Security Services Daemon...
Oct 04 01:09:11 ad.octocat.lab sssd[5752]: Starting up
Oct 04 01:09:11 ad.octocat.lab sssd_be[5755]: Starting up
Oct 04 01:09:11 ad.octocat.lab sssd_nss[5756]: Starting up
Oct 04 01:09:11 ad.octocat.lab sssd_pam[5757]: Starting up
Oct 04 01:09:11 ad.octocat.lab systemd[1]: Started System Security Services Daemon.
This can be useful when executing automation scripts that do not need to wait and block further execution.
