{"id":596,"date":"2020-09-29T17:24:35","date_gmt":"2020-09-29T09:24:35","guid":{"rendered":"https:\/\/blog.espnlol.com\/?p=596"},"modified":"2022-04-20T18:20:57","modified_gmt":"2022-04-20T10:20:57","slug":"k8s-nodeaffinity","status":"publish","type":"post","link":"https:\/\/blog.espnlol.com\/?p=596","title":{"rendered":"k8s nodeAffinity"},"content":{"rendered":"\n

Node Affinity
\nAffinity \u7ffb\u8bd1\u6210\u4e2d\u6587\u662f\u201c\u4eb2\u548c\u6027\u201d\uff0c\u5b83\u5bf9\u5e94\u7684\u662f Anti-Affinity\uff0c\u6211\u4eec\u7ffb\u8bd1\u6210\u201c\u4e92\u65a5\u201d\u3002\u8fd9\u4e24\u4e2a\u8bcd\u6bd4\u8f83\u5f62\u8c61\uff0c\u53ef\u4ee5\u628a pod \u9009\u62e9 node \u7684\u8fc7\u7a0b\u7c7b\u6bd4\u6210\u78c1\u94c1\u7684\u5438\u5f15\u548c\u4e92\u65a5\uff0c\u4e0d\u540c\u7684\u662f\u9664\u4e86\u7b80\u5355\u7684\u6b63\u8d1f\u6781\u4e4b\u5916\uff0cpod \u548c node \u7684\u5438\u5f15\u548c\u4e92\u65a5\u662f\u53ef\u4ee5\u7075\u6d3b\u914d\u7f6e\u7684\u3002<\/p>\n\n\n\n

Affinity\u7684\u4f18\u70b9\uff1a<\/p>\n\n\n\n

\u5339\u914d\u6709\u66f4\u591a\u7684\u903b\u8f91\u7ec4\u5408\uff0c\u4e0d\u53ea\u662f\u5b57\u7b26\u4e32\u7684\u5b8c\u5168\u76f8\u7b49
\n\u8c03\u5ea6\u5206\u6210\u8f6f\u7b56\u7565(soft)\u548c\u786c\u7b56\u7565(hard)\uff0c\u5728\u8f6f\u7b56\u7565\u4e0b\uff0c\u5982\u679c\u6ca1\u6709\u6ee1\u8db3\u8c03\u5ea6\u6761\u4ef6\u7684\u8282\u70b9\uff0cpod\u4f1a\u5ffd\u7565\u8fd9\u6761\u89c4\u5219\uff0c\u7ee7\u7eed\u5b8c\u6210\u8c03\u5ea6\u3002
\n\u76ee\u524d\u4e3b\u8981\u7684node affinity\uff1a<\/p>\n\n\n\n

requiredDuringSchedulingIgnoredDuringExecution
\n\u8868\u793apod\u5fc5\u987b\u90e8\u7f72\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\u4e0a\uff0c\u5982\u679c\u6ca1\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\uff0c\u5c31\u4e0d\u505c\u91cd\u8bd5\u3002\u5176\u4e2dIgnoreDuringExecution\u8868\u793apod\u90e8\u7f72\u4e4b\u540e\u8fd0\u884c\u7684\u65f6\u5019\uff0c\u5982\u679c\u8282\u70b9\u6807\u7b7e\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u4e0d\u518d\u6ee1\u8db3pod\u6307\u5b9a\u7684\u6761\u4ef6\uff0cpod\u4e5f\u4f1a\u7ee7\u7eed\u8fd0\u884c\u3002<\/p>\n\n\n\n

requiredDuringSchedulingRequiredDuringExecution
\n\u8868\u793apod\u5fc5\u987b\u90e8\u7f72\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\u4e0a\uff0c\u5982\u679c\u6ca1\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\uff0c\u5c31\u4e0d\u505c\u91cd\u8bd5\u3002\u5176\u4e2dRequiredDuringExecution\u8868\u793apod\u90e8\u7f72\u4e4b\u540e\u8fd0\u884c\u7684\u65f6\u5019\uff0c\u5982\u679c\u8282\u70b9\u6807\u7b7e\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u4e0d\u518d\u6ee1\u8db3pod\u6307\u5b9a\u7684\u6761\u4ef6\uff0c\u5219\u91cd\u65b0\u9009\u62e9\u7b26\u5408\u8981\u6c42\u7684\u8282\u70b9\u3002<\/p>\n\n\n\n

preferredDuringSchedulingIgnoredDuringExecution
\n\u8868\u793a\u4f18\u5148\u90e8\u7f72\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\u4e0a\uff0c\u5982\u679c\u6ca1\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\uff0c\u5c31\u5ffd\u7565\u8fd9\u4e9b\u6761\u4ef6\uff0c\u6309\u7167\u6b63\u5e38\u903b\u8f91\u90e8\u7f72\u3002<\/p>\n\n\n\n

preferredDuringSchedulingRequiredDuringExecution
\n\u8868\u793a\u4f18\u5148\u90e8\u7f72\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\u4e0a\uff0c\u5982\u679c\u6ca1\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\uff0c\u5c31\u5ffd\u7565\u8fd9\u4e9b\u6761\u4ef6\uff0c\u6309\u7167\u6b63\u5e38\u903b\u8f91\u90e8\u7f72\u3002\u5176\u4e2dRequiredDuringExecution\u8868\u793a\u5982\u679c\u540e\u9762\u8282\u70b9\u6807\u7b7e\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u6ee1\u8db3\u4e86\u6761\u4ef6\uff0c\u5219\u91cd\u65b0\u8c03\u5ea6\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u8282\u70b9\u3002<\/p>\n\n\n\n

\u7f18\u7531<\/h3>\n\n\n\n

pod\u7ed1\u5b9a\u8282\u70b9\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 nodeSelector\uff0c\u4f46\u5b83\u6bd4\u8f83\u7b80\u5355\u7c97\u66b4\uff0c\u4f7f\u7528\u8d77\u6765\u4e0d\u80fd\u7075\u6d3b\u8c03\u5ea6\uff0c\u8fd9\u4e2a\u5728\u540e\u7eed\u7248\u672c\u4e2d\u4e5f\u4f1a\u6162\u6162\u8fc7\u5b9e\uff0c\u6240\u4ee5\u6211\u4eec\u4e00\u822c\u7528 nodeAffinity\u6765\u5b9e\u73b0\u8fd9\u4e9b\u9700\u6c42\u3002
\u5982\u679c\u6211\u4e0d\u5e0c\u671bpod\u8c03\u5ea6\u5230\u6253\u4e86 tester=chenqiang \u8fd9\u4e2a\u6807\u7b7e\u7684 node\uff0c\u90a3\u4e48\u9700\u8981\u4f7f\u7528 NotIn \u8fd9\u4e2a\u4ecb\u8bcd\uff0c\u5426\u5219\u4f7f\u7528 In \u3002
\u5047\u8bbe\u4e0d\u5e0c\u671b\u8c03\u5ea6\uff0c\u5219\u6dfb\u52a0\u5982\u4e0b\u7684 nodeAffinity:<\/p>\n\n\n\n

spec:\n      affinity:\n        nodeAffinity:\n          requiredDuringSchedulingIgnoredDuringExecution:\n            nodeSelectorTerms:\n            - matchExpressions:\n              - key: tester\n                operator: NotIn\n                values:\n                - chenqiang<\/pre>\n\n\n\n
\u5b8c\u6574\u5b9e\u4f8b<\/h3>\n\n\n\n
apiVersion: apps\/v1\nkind: Deployment\nmetadata:\n  name: nginx-hello-deployment\n  namespace: chenqiang-ns1\n  labels:\n    app: nginx-hello\nspec:\n  replicas: 2\n  selector:\n    matchLabels:\n      app: nginx-hello\n  template:\n    metadata:\n      labels:\n        app: nginx-hello\n    spec:\n      affinity:\n        nodeAffinity:\n          requiredDuringSchedulingIgnoredDuringExecution:\n            nodeSelectorTerms:\n            - matchExpressions:\n              - key: tester\n                operator: NotIn\n                values:\n                - chenqiang\n      containers:\n      - name: nginx-hello\n        image: docker-registry.saicstack.com\/chenqiang\/nginx-hello:v2.0\n        ports:\n        - containerPort: 80\n      imagePullSecrets:\n      - name: regcred<\/pre>\n\n\n\n
apiVersion: v1\nkind: Pod\nmetadata:\n  name: with-node-affinity\nspec:\n  affinity:\n    nodeAffinity:\n      requiredDuringSchedulingIgnoredDuringExecution:\n        nodeSelectorTerms:\n        - matchExpressions:\n          - key: kubernetes.io\/e2e-az-name\n            operator: In\n            values:\n            - e2e-az1\n            - e2e-az2\n      preferredDuringSchedulingIgnoredDuringExecution:\n      - weight: 1\n        preference:\n          matchExpressions:\n          - key: another-node-label-key\n            operator: In\n            values:\n            - another-node-label-value\n  containers:\n  - name: with-node-affinity\n    image: gcr.io\/google_containers\/pause:2.0<\/pre>\n\n\n\n
\u8fd9\u6761\u89c4\u5219\u8868\u793a\uff0cpod\u53ef\u4ee5\u88ab\u8c03\u5ea6\u5230\u6807\u7b7ekey\u4e3a\u201ckubernetes.io\/e2e-az-name\u201d\uff0c\u503c\u4e3a\u201ce2e-az1\u201d\u6216\u201ce2e-az2\u201d\u7684\u8282\u70b9\u3002\u53e6\u5916\uff0c\u5728\u6ee1\u8db3\u8be5\u6761\u4ef6\u7684\u8282\u70b9\u4e2d\uff0c\u4f18\u5148\u4f7f\u7528\u5177\u6709\u201canother-node-label-key\u201d\u6807\u7b7e\uff0c\u4e14\u81f3\u4e3a\u201canother-node-label-value\u201d\u7684\u8282\u70b9\u3002
\n\u8fd9\u4e2a pod \u540c\u65f6\u5b9a\u4e49\u4e86 requiredDuringSchedulingIgnoredDuringExecution \u548c preferredDuringSchedulingIgnoredDuringExecution \u4e24\u79cd nodeAffinity\u3002\u7b2c\u4e00\u4e2a\u8981\u6c42 pod \u8fd0\u884c\u5728\u7279\u5b9a AZ \u7684\u8282\u70b9\u4e0a\uff0c\u7b2c\u4e8c\u4e2a\u5e0c\u671b\u8282\u70b9\u6700\u597d\u6709\u5bf9\u5e94\u7684 another-node-label-key:another-node-label-value \u6807\u7b7e\u3002<\/p>\n\n\n\n
\u8fd9\u91cc\u7684\u5339\u914d\u903b\u8f91\u662flabel\u5728\u67d0\u4e2a\u5217\u8868\u4e2d\uff0c\u53ef\u9009\u7684\u64cd\u4f5c\u7b26\u6709\uff1a<\/p>\n\n\n\n
In: label\u7684\u503c\u5728\u67d0\u4e2a\u5217\u8868\u4e2d
\nNotIn\uff1alabel\u7684\u503c\u4e0d\u5728\u67d0\u4e2a\u5217\u8868\u4e2d
\nExists\uff1a\u67d0\u4e2alabel\u5b58\u5728
\nDoesNotExist\uff1a\u67d0\u4e2alabel\u4e0d\u5b58\u5728
\nGt\uff1alabel\u7684\u503c\u5927\u4e8e\u67d0\u4e2a\u503c\uff08\u5b57\u7b26\u4e32\u6bd4\u8f83\uff09
\nLt\uff1alabel\u7684\u503c\u5c0f\u4e8e\u67d0\u4e2a\u503c\uff08\u5b57\u7b26\u4e32\u6bd4\u8f83\uff09
\n\u5982\u679cnodeAffinity\u4e2dnodeSelector\u6709\u591a\u4e2a\u9009\u9879\uff0c\u8282\u70b9\u6ee1\u8db3\u4efb\u4f55\u4e00\u4e2a\u6761\u4ef6\u5373\u53ef\uff1b\u5982\u679cmatchExpressions\u6709\u591a\u4e2a\u9009\u9879\uff0c\u5219\u8282\u70b9\u5fc5\u987b\u540c\u65f6\u6ee1\u8db3\u8fd9\u4e9b\u9009\u9879\u624d\u80fd\u8fd0\u884cpod \u3002<\/p>\n\n\n\n
\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0cnode\u5e76\u6ca1\u6709anti-affinity\u8fd9\u79cd\u4e1c\u897f\uff0c\u56e0\u4e3aNotIn\u548cDoesNotExist\u80fd\u63d0\u4f9b\u7c7b\u4f3c\u7684\u529f\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Node Affinity Affinity \u7ffb\u8bd1\u6210\u4e2d\u6587\u662f\u201c\u4eb2\u548c\u6027\u201d\uff0c\u5b83\u5bf9\u5e94\u7684\u662f … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-596","post","type-post","status-publish","format-standard","hentry","category-k8s"],"_links":{"self":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/596","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=596"}],"version-history":[{"count":1,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/596\/revisions"}],"predecessor-version":[{"id":597,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=\/wp\/v2\/posts\/596\/revisions\/597"}],"wp:attachment":[{"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=596"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=596"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.espnlol.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=596"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}