{"id":1582,"date":"2020-06-09T17:51:02","date_gmt":"2020-06-09T09:51:02","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1582"},"modified":"2020-06-09T17:51:02","modified_gmt":"2020-06-09T09:51:02","slug":"kubernetes-statefulsets","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1582","title":{"rendered":"Kubernetes StatefulSets"},"content":{"rendered":"<header class=\\\"entry-header\\\">\n<h1 class=\\\"entry-title\\\">Kubernetes StatefulSets<\/h1>\n<\/header>\n<div class=\\\"entry-content\\\">\n<div id=\\\"toc_container\\\" class=\\\"no_bullets\\\">\n<ul class=\\\"toc_list\\\">\n<li><span class=\\\"toc_number toc_depth_1\\\">1<\/span>\u00a0\u4f7f\u7528StatefulSets<\/li>\n<li><span class=\\\"toc_number toc_depth_1\\\">2<\/span>\u00a0\u9650\u5236<\/li>\n<li><span class=\\\"toc_number toc_depth_1\\\">3<\/span>\u00a0\u7ec4\u4ef6<\/li>\n<li><span class=\\\"toc_number toc_depth_1\\\">4<\/span>\u00a0\u90e8\u7f72\u548c\u6269\u5c55\n<ul>\n<li><span class=\\\"toc_number toc_depth_2\\\">4.1<\/span>\u00a0Pod\u7ba1\u7406\n<ul>\n<li><span class=\\\"toc_number toc_depth_3\\\">4.1.1<\/span>\u00a0OrderedReady Pod Management<\/li>\n<li><span class=\\\"toc_number toc_depth_3\\\">4.1.2<\/span>\u00a0Parallel Pod Management<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><span class=\\\"toc_number toc_depth_1\\\">5<\/span>\u00a0Update Strategies\n<ul>\n<li><span class=\\\"toc_number toc_depth_2\\\">5.1<\/span>\u00a0\u5220\u9664<\/li>\n<li><span class=\\\"toc_number toc_depth_2\\\">5.2<\/span>\u00a0\u6eda\u52a8\u66f4\u65b0\n<ul>\n<li><span class=\\\"toc_number toc_depth_3\\\">5.2.1<\/span>\u00a0Partitions<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n<p>StatefulSets\uff08\u6709\u72b6\u6001\u7cfb\u7edf\u670d\u52a1\u8bbe\u8ba1\uff09\u5728Kubernetes 1.7\u4e2d\u8fd8\u662fbeta\u7279\u6027\uff0c\u540c\u65f6StatefulSets\u662f1.4 \u7248\u672c\u4e2dPetSets\u7684\u66ff\u4ee3\u54c1\u3002<\/p>\n<h2 id=\\\"using-statefulsets\\\"><span id=\\\"StatefulSets\\\">\u4f7f\u7528StatefulSets<\/span><\/h2>\n<p>\u5728\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\u65f6\u4f7f\u7528StatefulSets\uff1a<\/p>\n<ul>\n<li>\u7a33\u5b9a\u6027\uff0c\u552f\u4e00\u7684\u7f51\u7edc\u6807\u8bc6\u7b26\u3002<\/li>\n<li>\u7a33\u5b9a\u6027\uff0c\u6301\u4e45\u5316\u5b58\u50a8\u3002<\/li>\n<li>\u6709\u5e8f\u7684\u90e8\u7f72\u548c\u6269\u5c55\u3002<\/li>\n<li>\u6709\u5e8f\u7684\u5220\u9664\u548c\u7ec8\u6b62\u3002<\/li>\n<li>\u6709\u5e8f\u7684\u81ea\u52a8\u6eda\u52a8\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<p>Pod\u8c03\u5ea6\u8fd0\u884c\u65f6\uff0c\u5982\u679c\u5e94\u7528\u4e0d\u9700\u8981\u4efb\u4f55\u7a33\u5b9a\u7684\u6807\u793a\u3001\u6709\u5e8f\u7684\u90e8\u7f72\u3001\u5220\u9664\u548c\u6269\u5c55\uff0c\u5219\u5e94\u8be5\u4f7f\u7528\u4e00\u7ec4\u65e0\u72b6\u6001\u526f\u672c\u7684\u63a7\u5236\u5668\u6765\u90e8\u7f72\u5e94\u7528\uff0c\u4f8b\u5982\u00a0Deployment\u00a0\u6216\u00a0ReplicaSet\u66f4\u9002\u5408\u65e0\u72b6\u6001\u670d\u52a1\u9700\u6c42\u3002<\/p>\n<h2 id=\\\"limitations\\\"><span id=\\\"i\\\">\u9650\u5236<\/span><\/h2>\n<ul>\n<li>StatefulSet\u8fd8\u662fbeta\u7279\u6027\uff0c\u5728Kubernetes 1.5\u7248\u672c\u4e4b\u524d\u4efb\u4f55\u7248\u672c\u90fd\u4e0d\u53ef\u4ee5\u4f7f\u7528\u3002<\/li>\n<li>\u4e0e\u6240\u6709alpha \/ beta \u7279\u6027\u7684\u8d44\u6e90\u4e00\u6837\uff0c\u53ef\u4ee5\u901a\u8fc7apiserver\u914d\u7f6e-runtime-config\u6765\u7981\u7528StatefulSet\u3002<\/li>\n<li>Pod\u7684\u5b58\u50a8\uff0c\u5fc5\u987b\u57fa\u4e8e\u8bf7\u6c42storage class\u7684PersistentVolume Provisioner\u6216\u7531\u7ba1\u7406\u5458\u9884\u5148\u914d\u7f6e\u6765\u63d0\u4f9b\u3002<\/li>\n<li>\u57fa\u4e8e\u6570\u636e\u5b89\u5168\u6027\u8bbe\u8ba1\uff0c\u5220\u9664\u6216\u7f29\u653eStatefulSet\u5c06\u4e0d\u4f1a\u5220\u9664\u4e0eStatefulSet\u5173\u8054\u7684Volume\u3002<\/li>\n<li>StatefulSets\u9700\u8981Headless Service\u8d1f\u8d23Pods\u7684\u7f51\u7edc\u7684\u4e00\u81f4\u6027\uff08\u5fc5\u987b\u521b\u5efa\u6b64\u670d\u52a1\uff09\u3002<\/li>\n<\/ul>\n<h2 id=\\\"components\\\"><span id=\\\"i-2\\\">\u7ec4\u4ef6<\/span><\/h2>\n<p>\u793a\u4f8b\uff1a<\/p>\n<ul>\n<li>name\u4e3anginx\u7684Headless Service\u7528\u4e8e\u63a7\u5236\u7f51\u7edc\u57df\u3002<\/li>\n<li>StatefulSet\uff08name\u4e3aweb\uff09\u6709\u4e00\u4e2aSpec\uff0c\u5728\u4e00\u4e2aPod\u4e2d\u542f\u52a8\u5177\u67093\u4e2a\u526f\u672c\u7684nginx\u5bb9\u5668\u3002<\/li>\n<li>volumeClaimTemplates\u4f7f\u7528PersistentVolumes\u4f9b\u5e94\u5546\u7684PersistentVolume\u6765\u63d0\u4f9b\u7a33\u5b9a\u7684\u5b58\u50a8\u3002<\/li>\n<\/ul>\n<div>\n<pre>apiVersion: v1\nkind: Service\nmetadata:\n  name: nginx\n  labels:\n    app: nginx\nspec:\n  ports:\n  - port: 80\n    name: web\n  clusterIP: None\n  selector:\n    app: nginx\n---\napiVersion: apps\/v1beta1\nkind: StatefulSet\nmetadata:\n  name: web\nspec:\n  serviceName: \\\"nginx\\\"\n  replicas: 3\n  template:\n    metadata:\n      labels:\n        app: nginx\n    spec:\n      terminationGracePeriodSeconds: 10\n      containers:\n      - name: nginx\n        image: gcr.io\/google_containers\/nginx-slim:0.8\n        ports:\n        - containerPort: 80\n          name: web\n        volumeMounts:\n        - name: www\n          mountPath: \/usr\/share\/nginx\/html\n  volumeClaimTemplates:\n  - metadata:\n      name: www\n    spec:\n      accessModes: [ \\\"ReadWriteOnce\\\" ]\n      storageClassName: my-storage-class\n      resources:\n        requests:\n          storage: 1Gi<\/pre>\n<\/div>\n<h2 id=\\\"deployment-and-scaling-guarantees\\\"><span id=\\\"i-3\\\">\u90e8\u7f72\u548c\u6269\u5c55<\/span><\/h2>\n<ul>\n<li>\u5bf9\u4e8e\u5177\u6709N\u4e2a\u526f\u672c\u7684StatefulSet\uff0c\u5f53\u90e8\u7f72Pod\u65f6\uff0c\u5c06\u4f1a\u987a\u5e8f\u4ece{0..N-1}\u5f00\u59cb\u521b\u5efa\u3002<\/li>\n<li>Pods\u88ab\u5220\u9664\u65f6\uff0c\u4f1a\u4ece{N-1..0}\u7684\u76f8\u53cd\u987a\u5e8f\u7ec8\u6b62\u3002<\/li>\n<li>\u5728\u5c06\u7f29\u653e\u64cd\u4f5c\u5e94\u7528\u4e8ePod\u4e4b\u524d\uff0c\u5b83\u7684\u6240\u6709\u524d\u8f88\u5fc5\u987b\u8fd0\u884c\u548c\u5c31\u7eea\u3002<\/li>\n<li>\u5bf9Pod\u6267\u884c\u6269\u5c55\u64cd\u4f5c\u65f6\uff0c\u524d\u9762\u7684Pod\u5fc5\u987b\u90fd\u5904\u4e8eRunning\u548cReady\u72b6\u6001\u3002<\/li>\n<li>\u5728Pod\u7ec8\u6b62\u4e4b\u524d\uff0c\u6240\u6709successors\u90fd\u987b\u5b8c\u5168\u5173\u95ed\u3002<\/li>\n<\/ul>\n<p>\u4e0d\u8981\u5c06StatefulSet\u7684pod.Spec.TerminationGracePeriodSeconds\u503c\u8bbe\u7f6e\u4e3a0\uff0c\u8fd9\u6837\u8bbe\u7f6e\u4e0d\u5b89\u5168\uff0c\u5efa\u8bae\u4e0d\u8981\u8fd9\u4e48\u4f7f\u7528\u3002<br \/>\n\u5728\u4e0a\u9762\u793a\u4f8b\u4e2d\uff0c\u4f1a\u6309\u987a\u5e8f\u90e8\u7f72\u4e09\u4e2apod\uff08name: web-0\u3001web-1\u3001web-2\uff09\u3002web-0\u5728Running and Ready\u72b6\u6001\u540e\u5f00\u59cb\u90e8\u7f72web-1\uff0cweb-1\u5728Running and Ready\u72b6\u6001\u540e\u90e8\u7f72web-2\uff0c\u671f\u95f4\u5982\u679cweb-0\u8fd0\u884c\u5931\u8d25\uff0cweb-2\u662f\u4e0d\u4f1a\u88ab\u8fd0\u884c\uff0c\u76f4\u5230web-0\u91cd\u65b0\u8fd0\u884c\uff0cweb-1\u3001web-2\u624d\u4f1a\u6309\u987a\u5e8f\u8fdb\u884c\u8fd0\u884c\u3002<br \/>\n\u5982\u679c\u7528\u6237\u901a\u8fc7StatefulSet\u6765\u6269\u5c55\u4fee\u6539\u90e8\u7f72pod\u526f\u672c\u6570\uff0c\u6bd4\u5982\u4fee\u6539replicas=1\uff0c\u90a3\u4e48web-2\u9996\u5148\u88ab\u7ec8\u6b62\u3002\u5728web-2\u5b8c\u5168\u5173\u95ed\u548c\u5220\u9664\u4e4b\u524d\uff0cweb-1\u662f\u4e0d\u4f1a\u88ab\u7ec8\u6b62\u3002\u5982\u679c\u5728web-2\u88ab\u7ec8\u6b62\u548c\u5b8c\u5168\u5173\u95ed\u540e\uff0c\u4f46web-1\u8fd8\u6ca1\u6709\u88ab\u7ec8\u6b62\u4e4b\u524d\uff0c\u6b64\u65f6web-0\u8fd0\u884c\u51fa\u9519\u4e86\uff0c\u90a3\u4e48\u76f4\u5230web-0\u518d\u6b21\u53d8\u4e3aRunning and Ready\u72b6\u6001\u4e4b\u540e\uff0cweb-1\u624d\u4f1a\u88ab\u7ec8\u6b62\u3002<\/p>\n<h3 id=\\\"pod-management-policies\\\"><span id=\\\"Pod\\\">Pod\u7ba1\u7406<\/span><\/h3>\n<p>\u5728Kubernetes 1.7\u53ca\u66f4\u9ad8\u7248\u672c\u4e2d\uff0cStatefulSet\u653e\u5bbd\u4e86\u6392\u5e8f\u89c4\u5219\uff0c\u540c\u65f6\u901a\u8fc7.spec.podManagementPolicy\u5b57\u6bb5\u4fdd\u7559\u5176uniqueness\u548cidentity guarantees<\/p>\n<h4 id=\\\"orderedready-pod-management\\\"><span id=\\\"OrderedReady_Pod_Management\\\">OrderedReady Pod Management<\/span><\/h4>\n<p id=\\\"orderedready-pod-management\\\">OrderedReady Pod Management \u662fStatefulSets\u7684\u9ed8\u8ba4\u884c\u4e3a\u3002\u5b83\u5b9e\u73b0\u4e86\u4e0a\u8ff0 \u201c\u90e8\u7f72\/\u6269\u5c55\u201d \u884c\u4e3a\u3002<\/p>\n<h4 id=\\\"parallel-pod-management\\\"><span id=\\\"Parallel_Pod_Management\\\">Parallel Pod Management<\/span><\/h4>\n<p id=\\\"parallel-pod-management\\\">Parallel Pod Management\u544a\u8bc9StatefulSet\u63a7\u5236\u5668\u540c\u65f6\u542f\u52a8\u6216\u7ec8\u6b62\u6240\u6709Pod\u3002<\/p>\n<h2 id=\\\"update-strategies\\\"><span id=\\\"Update_Strategies\\\">Update Strategies<\/span><\/h2>\n<p>\u5728Kubernetes 1.7\u53ca\u66f4\u9ad8\u7248\u672c\u4e2d\uff0cStatefulSet\u7684.spec.updateStrategy\u5b57\u6bb5\u5141\u8bb8\u914d\u7f6e\u548c\u7981\u7528StatefulSet\u4e2dPods\u7684containers\u3001<a href=\\\"http:\/\/docs.kubernetes.org.cn\/247.html\\\" target=\\\"_blank\\\" rel=\\\"noopener noreferrer\\\">labels<\/a>\u3001resource request\/limits\u548c<a href=\\\"http:\/\/docs.kubernetes.org.cn\/255.html\\\" target=\\\"_blank\\\" rel=\\\"noopener noreferrer\\\">annotations<\/a>\u7684\u6eda\u52a8\u66f4\u65b0\u3002<\/p>\n<h3 id=\\\"on-delete\\\"><span id=\\\"i-4\\\">\u5220\u9664<\/span><\/h3>\n<p>\u5f53spec.updateStrategy\u672a\u6307\u5b9a\u65f6\u7684\u9ed8\u8ba4\u7b56\u7565\uff0cOnDelete\u66f4\u65b0\u7b56\u7565\u5b9e\u73b0\u4e86\u4f20\u7edf\uff081.6\u548c\u4ee5\u524d\uff09\u7684\u884c\u4e3a\u3002\u5f53StatefulSet\u00a0.spec.updateStrategy.type\u8bbe\u7f6e\u4e3aOnDelete\uff0cStatefulSet\u63a7\u5236\u5668\u5c06\u4e0d\u4f1a\u81ea\u52a8\u66f4\u65b0StatefulSet\u4e2d\u7684Pod\uff0c\u7528\u6237\u5fc5\u987b\u624b\u52a8\u5220\u9664Pods\u4ee5\u4f7f\u63a7\u5236\u5668\u521b\u5efa\u65b0\u7684Pod\u3002<\/p>\n<h3 id=\\\"rolling-updates\\\"><span id=\\\"i-5\\\">\u6eda\u52a8\u66f4\u65b0<\/span><\/h3>\n<p>RollingUpdate\u66f4\u65b0\u7b56\u7565\u5b9e\u73b0\u4e86\u81ea\u52a8\u5316\uff0c\u4f7fStatefulSet\u4e2d\u7684Pod\u6eda\u52a8\u66f4\u65b0\u3002\u5f53StatefulSet\u00a0.spec.updateStrategy.type\u8bbe\u7f6e\u4e3aRollingUpdate\uff0cStatefulSet\u63a7\u5236\u5668\u5c06\u5220\u9664\u5e76\u91cd\u65b0\u521b\u5efaStatefulSet\u4e2d\u7684\u6bcf\u4e2aPod\u3002\u5b83\u5c06\u4ee5\u4e0ePod\u7ec8\u6b62\u76f8\u540c\u7684\u987a\u5e8f\u8fdb\u884c\uff08\u4ece\u6700\u5927\u7684\u5e8f\u6570\u5230\u6700\u5c0f\u7684\u987a\u5e8f\uff09\u6765\u66f4\u65b0\u6bcf\u4e2aPod\u3002<\/p>\n<h4 id=\\\"partitions\\\"><span id=\\\"Partitions\\\">Partitions<\/span><\/h4>\n<p>\u901a\u8fc7\u6307\u5b9a\u00a0.spec.updateStrategy.rollingUpdate.partition\u6765\u5206\u5272RollingUpdate\u66f4\u65b0\u7b56\u7565\u3002\u5982\u679c\u6307\u5b9a\u4e86partition\uff0c\u5219\u5f53\u66f4\u65b0StatefulSet\u65f6\uff0c\u5c06\u66f4\u65b0\u5177\u6709\u5927\u4e8e\u6216\u7b49\u4e8epartition\u7684\u5e8f\u6570\u7684\u6240\u6709Pods\u00a0.spec.template\uff0c\u5c0f\u4e8epartition\u7684\u5e8f\u6570\u7684\u6240\u6709Pod\u5c06\u4e0d\u4f1a\u88ab\u66f4\u65b0\u3002\u5982\u679c\u4e00\u4e2aStatefulSet\u7684.spec.updateStrategy.rollingUpdate.partition\u5927\u4e8e\u5b83.spec.replicas\uff0c\u5b83\u7684\u66f4\u65b0.spec.template\u5c06\u4e0d\u4f1a\u88ab\u4f20Pods\u3002\u5728\u901a\u5e38\u6570\u60c5\u51b5\u4e0b\uff0c\u4e0d\u9700\u8981\u4f7f\u7528partition\uff0c\u4f46\u5982\u679c\u9700\u8981\u8fdb\u884c\u66f4\u65b0\uff0c\u63a8\u51fa\u91d1\u4e1d\u96c0\u6216\u6267\u884c\u5206\u9636\u6bb5\u63a8\u51fa\uff0c\u53ef\u4ee5\u4f7f\u7528partition\u3002\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Kubernetes StatefulSets 1\u00a0\u4f7f\u7528StatefulSets 2\u00a0\u9650\u5236 3\u00a0\u7ec4\u4ef6 4\u00a0\u90e8\u7f72 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"http:\/\/www.weijing.co\/?p=1582\"> <span class=\"screen-reader-text\">Kubernetes StatefulSets<\/span> \u67e5\u770b\u5168\u6587 &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[104,123],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"Kubernetes StatefulSets 1\u00a0\u4f7f\u7528StatefulSets 2\u00a0\u9650\u5236 3\u00a0\u7ec4\u4ef6 4\u00a0\u90e8\u7f72&hellip;","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1582"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1582"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1582\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1582"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}