1. 准备定时脚步
如果是 Bash 脚本，第一行需要指定解释器。
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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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别忘了添加可执行权限。
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chmod +x /root/scripts/quick-clear.sh
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2. 添加 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
在 [Timer] 中可以使用各种参数控制定时任务的执行周期：
- OnActiveSec，定时器生效后，多少时间开始执行任务
- OnBootSec，系统启动后，多少时间开始执行任务
- OnStartupSec，Systemd 进程启动后，多少时间开始执行任务
- OnUnitActiveSec，该单元上次执行后，等多少时间再次执行
- OnUnitInactiveSec，定时器上次关闭后多少时间，再次执行
- OnCalendar，基于绝对时间，而不是相对时间执行
- AccuracySec，如果因为各种原因，任务必须推迟执行，推迟的最大秒数，默认是60秒
3. 添加 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. 管理定时任务
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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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journalctl -u quick-clear.timer -f
-- 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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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. 参考
- http://www.jinbuguo.com/systemd/systemd.timer.html
