1. Preparing the Scheduled Script
If it is a Bash script, the first line needs to specify the interpreter.
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| mkdir -p /root/scripts
vim /root/scripts/quick-clear.sh
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| #!/bin/sh
/usr/local/bin/kubectl --kubeconfig /root/.kube/config get pods --all-namespaces -o wide | grep Evicted | awk '{print $1,$2}' | xargs --no-run-if-empty -L1 /usr/local/bin/kubectl --kubeconfig /root/.kube/config delete pod -n || true
/usr/local/bin/kubectl --kubeconfig /root/.kube/config get pods --all-namespaces -o wide | grep Error | awk '{print $1,$2}' | xargs --no-run-if-empty -L1 /usr/local/bin/kubectl --kubeconfig /root/.kube/config delete pod -n || true
/usr/local/bin/kubectl --kubeconfig /root/.kube/config get pods --all-namespaces -o wide | grep Completed | awk '{print $1,$2}' | xargs --no-run-if-empty -L1 /usr/local/bin/kubectl --kubeconfig /root/.kube/config delete pod -n || true
/usr/local/bin/kubectl --kubeconfig /root/.kube/config get pipelinerun --all-namespaces -o wide | grep Succeeded | awk '{print $1,$2}' | xargs --no-run-if-empty -L1 /usr/local/bin/kubectl --kubeconfig /root/.kube/config delete pipelinerun -n || true
/usr/local/bin/kubectl --kubeconfig /root/.kube/config get pipelinerun --all-namespaces -o wide | grep PipelineRunTimeout | awk '{print $1,$2}' | xargs --no-run-if-empty -L1 /usr/local/bin/kubectl --kubeconfig /root/.kube/config delete pipelinerun -n || true
/usr/local/bin/kubectl --kubeconfig /root/.kube/config get pipelinerun --all-namespaces -o wide | grep InvalidWorkspaceBindings | awk '{print $1,$2}' | xargs --no-run-if-empty -L1 /usr/local/bin/kubectl --kubeconfig /root/.kube/config delete pipelinerun -n || true
/usr/local/bin/kubectl --kubeconfig /root/.kube/config get pipelinerun --all-namespaces -o wide | grep Failed | awk '{print $1,$2}' | xargs --no-run-if-empty -L1 /usr/local/bin/kubectl --kubeconfig /root/.kube/config delete pipelinerun -n || true
/usr/local/bin/kubectl --kubeconfig /root/.kube/config describe -A pvc | grep -E "^Name:.*$|^Namespace:.*$|^Used By:.*$" | grep -B 2 "<none>" | grep -E "^Name:.*$|^Namespace:.*$" | cut -f2 -d: | paste -d " " - - | xargs --no-run-if-empty -n2 bash -c '/usr/local/bin/kubectl --kubeconfig /root/.kube/config -n ${1} delete pvc ${0}' || true
/usr/bin/docker images | grep none | awk '{print $3}' | xargs --no-run-if-empty /usr/bin/docker rmi || true
/usr/bin/docker images |grep -E "([0-9a-z]+[-]){3,}[0-9]{9}" |awk '{print $3}' | xargs --no-run-if-empty /usr/bin/docker rmi || true
/usr/bin/docker system prune -f || true
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Do not forget to add executable permissions.
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| chmod +x /root/scripts/quick-clear.sh
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2. Adding the timer
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| vim /etc/systemd/system/quick-clear.timer
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[Unit]
Description=clear every week
[Timer]
OnCalendar=*-*-* 5:00:00
Unit=quick-clear.service
[Install]
WantedBy=timers.target
Inside [Timer] you can use various parameters to control how often the scheduled task runs:
- OnActiveSec, how long after the timer takes effect the task starts to run
- OnBootSec, how long after the system boots the task starts to run
- OnStartupSec, how long after the Systemd process starts the task starts to run
- OnUnitActiveSec, how long after that unit last ran before it runs again
- OnUnitInactiveSec, how long after the timer was last deactivated before it runs again
- OnCalendar, run based on absolute time rather than relative time
- AccuracySec, the maximum number of seconds the task may be postponed for various reasons; the default is 60 seconds
3. Adding the service
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| vim /etc/systemd/system/quick-clear.service
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[Unit]
Description=clear every week
Conflicts= quick-clear.timer
[Service]
ExecStart=/root/scripts/quick-clear.sh
4. Managing Scheduled Tasks
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| systemctl daemon-reload
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| systemctl start quick-clear.timer
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| systemctl status quick-clear.timer
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| systemctl enable quick-clear.timer
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-- Logs begin at Wed 2022-03-30 12:30:27 CST. --
May 26 14:30:17 node3 systemd[1]: Started clear every week.
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- Check the task execution log
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| journalctl -u quick-clear.service -f
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| systemctl list-timers
NEXT LEFT LAST PASSED UNIT ACTIVATES
Thu 2022-05-26 15:54:35 CST 1h 23min left Thu 2022-05-26 03:42:34 CST 10h ago ua-messaging.timer ua-messaging.service
Thu 2022-05-26 17:58:00 CST 3h 27min left Wed 2022-05-25 17:58:00 CST 20h ago systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
Thu 2022-05-26 19:56:45 CST 5h 26min left Thu 2022-05-26 11:45:53 CST 2h 44min ago fwupd-refresh.timer fwupd-refresh.service
Fri 2022-05-27 00:00:00 CST 9h left Thu 2022-05-26 00:00:00 CST 14h ago logrotate.timer logrotate.service
Fri 2022-05-27 00:00:00 CST 9h left Thu 2022-05-26 00:00:00 CST 14h ago man-db.timer man-db.service
Fri 2022-05-27 00:00:37 CST 9h left Thu 2022-05-26 14:30:07 CST 35s ago motd-news.timer motd-news.service
Fri 2022-05-27 04:38:51 CST 14h left Thu 2022-05-26 14:29:47 CST 55s ago apt-daily.timer apt-daily.service
Fri 2022-05-27 06:09:35 CST 15h left Thu 2022-05-26 06:37:25 CST 7h ago apt-daily-upgrade.timer apt-daily-upgrade.service
Sun 2022-05-29 03:10:09 CST 2 days left Sun 2022-05-22 03:10:55 CST 4 days ago e2scrub_all.timer e2scrub_all.service
Mon 2022-05-30 00:00:00 CST 3 days left Mon 2022-05-23 00:00:00 CST 3 days ago fstrim.timer fstrim.service
Wed 2022-06-01 18:53:47 CST 6 days left n/a n/a quick-clear.timer quick-clear.service
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5. References
