{"id":1988,"date":"2023-04-01T10:53:17","date_gmt":"2023-04-01T02:53:17","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1988"},"modified":"2023-04-22T07:42:01","modified_gmt":"2023-04-21T23:42:01","slug":"kubernetes-cronjob","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/04\/01\/kubernetes-cronjob\/","title":{"rendered":"Kubernetes \u4e4b Cronjob"},"content":{"rendered":"<h2>Cronjob \u7b80\u4ecb<\/h2>\n<p>Cronjob \u662f\u4e00\u4e2a\u8ba1\u5212\u4efb\u52a1\uff0c\u4e0e Linux \u7cfb\u7edf Crontab \u4e00\u6837\uff0c\u683c\u5f0f\u4e5f\u662f\u57fa\u672c\u4e00\u6837\u3002<\/p>\n<p>\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<p><!-- more --><\/p>\n<pre><code class=\"language-bash\"># \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 minute (0 - 59)\n# \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 hour (0 - 23)\n# \u2502 \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 day of the month (1 - 31)\n# \u2502 \u2502 \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 month (1 - 12)\n# \u2502 \u2502 \u2502 \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 day of the week (0 - 6) (Sunday to Saturday;\n# \u2502 \u2502 \u2502 \u2502 \u2502                                   7 is also Sunday on some systems)\n# \u2502 \u2502 \u2502 \u2502 \u2502\n# \u2502 \u2502 \u2502 \u2502 \u2502\n# * * * * * command to execute<\/code><\/pre>\n<p>\u5177\u4f53\u89c1 <a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/en.wikipedia.org\/wiki\/Cron#Overview\">https:\/\/en.wikipedia.org\/wiki\/Cron#Overview<\/a><\/p>\n<h2>Cronjob \u7ed3\u6784\u8349\u56fe<\/h2>\n<pre><code class=\"language-bash\">      Cronjobs\n     \/    |    \\\nJob1    Job2    Job3\n  |       |       |\nPod1    Pod2    Pod3<\/code><\/pre>\n<h2>Cronjob \u8fd0\u884c<\/h2>\n<p>CronJob \u4f7f\u7528 Job \u5bf9\u8c61\u6765\u5b8c\u6210\u4efb\u52a1\u3002CronJob \u6bcf\u6b21\u8fd0\u884c\u65f6\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a Job \u5bf9\u8c61\uff0cJob \u4f1a\u521b\u5efa\u4e00\u4e2a Pods \u6765\u6267\u884c\u4efb\u52a1\uff0c\u4efb\u52a1\u6267\u884c\u5b8c\u6210\u540e\u505c\u6b62\u5bb9\u5668\u3002<\/p>\n<h2>Cronjob \u7528\u9014<\/h2>\n<p>CronJob \u5728\u7279\u5b9a\u65f6\u95f4 \u6216 \u6309\u7279\u5b9a\u95f4\u9694\u8fd0\u884c\u4efb\u52a1\u3002CronJob \u975e\u5e38\u9002\u5408\u7528\u4e8e\u81ea\u52a8\u6267\u884c\u4efb\u52a1\uff0c\u4f8b\u5982\u5907\u4efd\u3001\u62a5\u544a\u3001\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u6216\u6e05\u7406\u4efb\u52a1\u3002<\/p>\n<h2>Cronjob \u4f8b\u5b50<\/h2>\n<pre><code class=\"language-yml\">apiVersion: batch\/v1beta1\nkind: CronJob\nmetadata:\n  name: demo # Cronjob\u7684\u540d\u79f0\n  labels:\n    app: demo\n    cron: hello\nspec:\n  concurrencyPolicy: Forbid\n  failedJobsHistoryLimit: 1\n  jobTemplate:\n    spec:\n      template:\n        metadata:\n          labels:\n            app: demo\n            cron: hello\n        spec:\n          containers:\n          - image: harbor.example.com\/hello:v1\n            imagePullPolicy: IfNotPresent\n            name: hello\n            command: [\/bin\/bash]\n            args:\n            - -c\n            - echo &quot;Hello World!!!&quot; # job \u5177\u4f53\u6267\u884c\u7684\u4efb\u52a1\n            resources:\n              limits:\n                cpu: 300m\n                memory: 300Mi\n              requests:\n                cpu: 100m\n                memory: 100Mi\n          nodeSelector:\n            label: test\n          imagePullSecrets:\n            - name: harbor-certification\n          restartPolicy: Never\n  schedule: &quot;15 * * * *&quot;  # job\u6267\u884c\u7684\u5468\u671f\uff0ccron\u683c\u5f0f\u7684\u5b57\u7b26\u4e32\n  successfulJobsHistoryLimit: 1<\/code><\/pre>\n<h2>Cronjob \u91cd\u8981\u53c2\u6570\u89e3\u91ca<\/h2>\n<ul>\n<li>\u8c03\u5ea6<\/li>\n<\/ul>\n<p><code>.spec.schedule<\/code>\u662f<code>.spec<\/code>\u4e2d\u5fc5\u9700\u7684\u5b57\u6bb5\uff0c\u5b83\u7684\u503c\u662f Cron \u683c\u5f0f\u5b57\u7684\u7b26\u4e32\uff0c\u4f8b\u5982\uff1a<code>0 * * * *<\/code>\uff0c\u6216\u8005<code>@hourly<\/code>\uff0c\u6839\u636e\u6307\u5b9a\u7684\u8c03\u5ea6\u65f6\u95f4 Job \u4f1a\u88ab\u521b\u5efa\u548c\u6267\u884c\u3002<\/p>\n<ul>\n<li>\u542f\u52a8 Job \u7684\u671f\u9650\uff08\u79d2\u7ea7\u522b\uff09<\/li>\n<\/ul>\n<p><code>.spec.startingDeadlineSeconds<\/code>\u5b57\u6bb5\u662f\u53ef\u9009\u7684\u3002\u5b83\u8868\u793a\u542f\u52a8 Job \u7684\u671f\u9650\uff08\u79d2\u7ea7\u522b\uff09\uff0c\u5982\u679c\u56e0\u4e3a\u4efb\u4f55\u539f\u56e0\u800c\u9519\u8fc7\u4e86\u88ab\u8c03\u5ea6\u7684\u65f6\u95f4\uff0c\u90a3\u4e48\u9519\u8fc7\u6267\u884c\u65f6\u95f4\u7684 Job \u5c06\u88ab\u8ba4\u4e3a\u662f\u5931\u8d25\u7684\u3002\u5982\u679c\u6ca1\u6709\u6307\u5b9a\uff0c\u5219\u6ca1\u6709\u671f\u9650\u3002<\/p>\n<ul>\n<li>Job \u5386\u53f2\u7248\u672c\u9650\u5236<\/li>\n<\/ul>\n<p>\u9ed8\u8ba4\u6ca1\u6709\u9650\u5236\uff0c\u6240\u6709\u6210\u529f\u548c\u5931\u8d25\u7684 Job \u90fd\u4f1a\u88ab\u4fdd\u7559\u3002\u7136\u800c\uff0c\u5f53\u8fd0\u884c\u4e00\u4e2a Cron Job \u65f6\uff0c\u5f88\u5feb\u5c31\u4f1a\u5806\u79ef\u5f88\u591a Job\uff0c\u63a8\u8350\u8bbe\u7f6e\u8fd9\u4e24\u4e2a\u5b57\u6bb5\u7684\u503c\u3002\u8bbe\u7f6e\u4e3a0\u5219\u4e0d\u4f1a\u4fdd\u5b58\uff0c\u8fd9\u4e24\u4e2a\u5b57\u6bb5\u4e0e<code>jobTemplate<\/code>\u540c\u7ea7\u3002<\/p>\n<ul>\n<li>\n<ul>\n<li><code>.spec.successfulJobsHistoryLimit<\/code>\uff1a# \u5b57\u6bb5\u662f\u53ef\u9009\u7684\uff0c\u6210\u529f\u5b8c\u6210\u7684\u4f5c\u4e1a\u4fdd\u5b58\u591a\u5c11\u4e2a<\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li><code>.spec.failedJobsHistoryLimit<\/code>\uff1a# \u5b57\u6bb5\u662f\u53ef\u9009\u7684\uff0c\u5931\u8d25\u7684\u4f5c\u4e1a\u4fdd\u5b58\u591a\u5c11\u4e2a<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5e76\u53d1\u7b56\u7565<\/p>\n<\/li>\n<\/ul>\n<p><code>.spec.concurrencyPolicy<\/code>\u5b57\u6bb5\u4e5f\u662f\u53ef\u9009\u7684\u3002\u5b83\u6307\u5b9a\u4e86\u5982\u4f55\u5904\u7406\u88ab Cron Job \u521b\u5efa\u7684 Job \u7684\u5e76\u53d1\u6267\u884c\u3002\u53ea\u5141\u8bb8\u6307\u5b9a\u4e0b\u9762\u7b56\u7565\u4e2d\u7684\u4e00\u79cd\uff1a<\/p>\n<p>\u6ce8\u610f\uff0c\u5f53\u524d\u7b56\u7565\u53ea\u80fd\u5e94\u7528\u4e8e\u540c\u4e00\u4e2a Cron Job \u521b\u5efa\u7684 Job\u3002\u5982\u679c\u5b58\u5728\u591a\u4e2a Cron Job\uff0c\u5b83\u4eec\u521b\u5efa\u7684 Job \u4e4b\u95f4\u603b\u662f\u5141\u8bb8\u5e76\u53d1\u8fd0\u884c\u3002<\/p>\n<ul>\n<li>\n<ul>\n<li><code>Allow<\/code>\uff08\u9ed8\u8ba4\uff09\uff1a\u5141\u8bb8\u5e76\u53d1\u8fd0\u884c Job<\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li><code>Forbid<\/code>\uff1a\u7981\u6b62\u5e76\u53d1\u8fd0\u884c\uff0c\u5982\u679c\u524d\u4e00\u4e2a\u8fd8\u6ca1\u6709\u5b8c\u6210\uff0c\u5219\u76f4\u63a5\u8df3\u8fc7\u4e0b\u4e00\u4e2a<\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li><code>Replace<\/code>\uff1a\u53d6\u6d88\u5f53\u524d\u6b63\u5728\u8fd0\u884c\u7684 Job\uff0c\u7528\u4e00\u4e2a\u65b0\u7684\u6765\u66ff\u6362<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6302\u8d77<\/p>\n<\/li>\n<\/ul>\n<p><code>.spec.suspend<\/code>\u5b57\u6bb5\u4e5f\u662f\u53ef\u9009\u7684\u3002\u5982\u679c\u8bbe\u7f6e\u4e3a true\uff0c\u540e\u7eed\u6240\u6709\u6267\u884c\u90fd\u5c06\u88ab\u6302\u8d77\u3002\u5b83\u5bf9\u5df2\u7ecf\u5f00\u59cb\u6267\u884c\u7684 Job \u4e0d\u8d77\u4f5c\u7528\u3002\u9ed8\u8ba4\u503c\u4e3a false\u3002<\/p>\n<ul>\n<li>\u91cd\u542f\u7b56\u7565<\/li>\n<\/ul>\n<p><code>restartPolicy<\/code>\u4ec5\u652f\u6301<code>Never<\/code>\u6216<code>OnFailure<\/code><\/p>\n<p>\u53c2\u8003\u94fe\u63a5\uff1a<a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/kubernetes.io\/zh\/docs\/concepts\/workloads\/controllers\/cron-jobs\/\">https:\/\/kubernetes.io\/zh\/docs\/concepts\/workloads\/controllers\/cron-jobs\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cronjob \u7b80\u4ecb Cronjob \u662f\u4e00\u4e2a\u8ba1\u5212\u4efb\u52a1\uff0c\u4e0e Linux \u7cfb\u7edf Crontab \u4e00\u6837\uff0c\u683c\u5f0f\u4e5f\u662f\u57fa\u672c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[356],"class_list":["post-1988","post","type-post","status-publish","format-standard","hentry","category-k8s","tag-kubernetes"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1988","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1988"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1988\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}