使用 systemd 定时器代替 cron 作业

复制[root@testvm1 ~]#systemctl status *timer● mlocate-updatedb.timer -Updates mlocate database every dayLoaded: loaded (/usr/lib/systemd/system/mlocate-updatedb.timer; enabled; vendor preset: enabled)Active: active (waiting) since Tue2020-06-0208:02:33 EDT;2 days agoTrigger:Fri2020-06-0500:00:00 EDT;15h leftTriggers:● mlocate-updatedb.serviceJun0208:02:33 testvm1.both.org systemd[1]:StartedUpdates mlocate database every day.● logrotate.timer -Daily rotation of log filesLoaded: loaded (/usr/lib/systemd/system/logrotate.timer; enabled; vendor preset: enabled)Active: active (waiting) since Tue2020-06-0208:02:33 EDT;2 days agoTrigger:Fri2020-06-0500:00:00 EDT;15h leftTriggers:● logrotate.serviceDocs:man:logrotate(8)man:logrotate.conf(5)Jun0208:02:33 testvm1.both.org systemd[1]:StartedDaily rotation of log files.● sysstat-summary.timer -Generate summary of yesterdays process accounting Loaded: loaded (/usr/lib/systemd/system/sysstat-summary.timer; enabled; vendor preset: enabled) Active: active (waiting) since Tue 2020-06-02 08:02:33 EDT; 2 days ago Trigger: Fri 2020-06-05 00:07:00 EDT; 15h left Triggers: ● sysstat-summary.serviceJun 02 08:02:33 testvm1.both.org systemd[1]: Started Generate summary of yesterdays process accounting.● fstrim.timer -Discard unused blocks once a weekLoaded: loaded (/usr/lib/systemd/system/fstrim.timer; enabled; vendor preset: enabled)Active: active (waiting) since Tue2020-06-0208:02:33 EDT;2 days agoTrigger:Mon2020-06-0800:00:00 EDT;3 days leftTriggers:● fstrim.serviceDocs:man:fstrimJun0208:02:33 testvm1.both.org systemd[1]:StartedDiscard unused blocks once a week.● sysstat-collect.timer -Run system activity accounting tool every 10 minutesLoaded: loaded (/usr/lib/systemd/system/sysstat-collect.timer; enabled; vendor preset: enabled)Active: active (waiting) since Tue2020-06-0208:02:33 EDT;2 days agoTrigger:Thu2020-06-0408:50:00 EDT;41s leftTriggers:● sysstat-collect.serviceJun0208:02:33 testvm1.both.org systemd[1]:StartedRun system activity accounting tool every 10 minutes.● dnf-makecache.timer - dnf makecache --timerLoaded: loaded (/usr/lib/systemd/system/dnf-makecache.timer; enabled; vendor preset: enabled)Active: active (waiting) since Tue2020-06-0208:02:33 EDT;2 days agoTrigger:Thu2020-06-0408:51:00 EDT;1min41s leftTriggers:● dnf-makecache.serviceJun0208:02:33 testvm1.both.org systemd[1]:Started dnf makecache –timer.●systemd-tmpfiles-clean.timer -DailyCleanup of TemporaryDirectoriesLoaded: loaded (/usr/lib/systemd/system/systemd-tmpfiles-clean.timer;static; vendor preset: disabled)Active: active (waiting) since Tue2020-06-0208:02:33 EDT;2 days agoTrigger:Fri2020-06-0508:19:00 EDT;23h leftTriggers:●systemd-tmpfiles-clean.serviceDocs:man:tmpfiles.d(5)man:systemd-tmpfiles(8)Jun0208:02:33 testvm1.both.org systemd[1]:StartedDailyCleanup of TemporaryDirectories.1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.