Отложитм запуск службы systemd при загрузке.
Проверьте службу, запуск которой вы хотите отложить при загрузке.
$ sudo systemctl status redis-server
● redis-server.service - Advanced key-value store
Loaded: loaded (/lib/systemd/system/redis-server.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2021-09-12 21:23:37 UTC; 12s ago
Docs: http://redis.io/documentation,
man:redis-server(1)
Main PID: 907 (redis-server)
Status: "Ready to accept connections"
Tasks: 5 (limit: 2311)
Memory: 7.2M
CPU: 114ms
CGroup: /system.slice/redis-server.service
└─907 /usr/bin/redis-server 127.0.0.1:6379
Sep 12 21:23:37 bullseye systemd[1]: Starting Advanced key-value store...
Sep 12 21:23:37 bullseye systemd[1]: Started Advanced key-value store.
Создайте триггер таймера для запуска службы через 1 минуту после загрузки системы.
Обратите внимание, что таймер использует то же имя службы.
$ cat <<EOF | sudo tee /etc/systemd/system/redis-server.timer [Unit] Description=Timer for the redis-server service [Timer] OnBootSec=1min [Install] WantedBy=timers.target EOF
Перезагрузите конфигурацию systemd.
$ sudo systemctl daemon-reload
Отключите службу при загрузке.
$ sudo systemctl disable redis-server
Removed /etc/systemd/system/multi-user.target.wants/redis-server.service. Removed /etc/systemd/system/redis.service.
Включите таймер:
$ sudo systemctl enable redis-server.timer
Created symlink /etc/systemd/system/timers.target.wants/redis-server.timer → /etc/systemd/system/redis-server.timer.
Перезапустите контейнер.
$ uptime
21:34:09 up 0 min, 1 user, load average: 0.00, 0.00, 0.00
По умолчанию служба будет отключена.
$ sudo systemctl status redis-server
● redis-server.service - Advanced key-value store
Loaded: loaded (/lib/systemd/system/redis-server.service; disabled; vendor preset: enabled)
Active: inactive (dead)
TriggeredBy: ● redis-server.timer
Docs: http://redis.io/documentation,
man:redis-server(1)
Таймер сработает автоматически.
$ sudo systemctl list-timers
NEXT LEFT LAST PASSED UNIT ACTIVATES Sun 2021-09-12 21:34:46 UTC 30s left n/a n/a redis-server.timer redis-server.service Sun 2021-09-12 21:48:46 UTC 14min left n/a n/a systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service Mon 2021-09-13 00:00:00 UTC 2h 25min left Sun 2021-09-12 11:57:28 UTC 9h ago logrotate.timer logrotate.service Mon 2021-09-13 00:00:00 UTC 2h 25min left Sun 2021-09-12 11:57:28 UTC 9h ago man-db.timer man-db.service Mon 2021-09-13 00:02:04 UTC 2h 27min left Fri 2021-09-10 09:41:16 UTC 2 days ago fstrim.timer fstrim.service Mon 2021-09-13 00:28:54 UTC 2h 54min left Sun 2021-09-12 15:20:37 UTC 6h ago apt-daily.timer apt-daily.service Mon 2021-09-13 06:22:58 UTC 8h left Sun 2021-09-12 12:00:52 UTC 9h ago apt-daily-upgrade.timer apt-daily-upgrade.service Sun 2021-09-19 03:10:52 UTC 6 days left Sun 2021-09-12 11:57:36 UTC 9h ago e2scrub_all.timer e2scrub_all.service 8 timers listed. Pass --all to see loaded but inactive timers, too.
Подождите оставшееся время и проверьте сервис.
$ sudo systemctl status redis-server
● redis-server.service - Advanced key-value store
Loaded: loaded (/lib/systemd/system/redis-server.service; disabled; vendor preset: enabled)
Active: active (running) since Sun 2021-09-12 21:34:46 UTC; 5s ago
TriggeredBy: ● redis-server.timer
Docs: http://redis.io/documentation,
man:redis-server(1)
Main PID: 562 (redis-server)
Status: "Ready to accept connections"
Tasks: 5 (limit: 2311)
Memory: 10.1M
CPU: 104ms
CGroup: /system.slice/redis-server.service
└─562 /usr/bin/redis-server 127.0.0.1:6379
Sep 12 21:34:46 bullseye systemd[1]: Starting Advanced key-value store...
Sep 12 21:34:46 bullseye systemd[1]: Started Advanced key-value store.
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