{"id":1497,"date":"2020-06-05T17:02:04","date_gmt":"2020-06-05T09:02:04","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1497"},"modified":"2020-06-05T17:02:04","modified_gmt":"2020-06-05T09:02:04","slug":"k8s-pod%e4%bb%8b%e7%bb%8d","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1497","title":{"rendered":"K8S Pod\u8d44\u6e90\u4ecb\u7ecd"},"content":{"rendered":"<div>\n<h4>\u4e00. Pod\u4ecb\u7ecd<\/h4>\n<p>\u9996\u5148Pod\u662f Kubernetes \u9879\u76ee\u4e2d\u6700\u5c0f\u7684 API \u5bf9\u8c61\uff0c\u800cPod\u4e5f\u662f\u7531\u5bb9\u5668\u7ec4\u7ec4\u6210\u7684\u3002Pod \u91cc\u7684\u6240\u6709\u5bb9\u5668\uff0c\u5171\u4eab\u7684\u662f\u540c\u4e00\u4e2a Network Namespace\uff0c\u5e76\u4e14\u53ef\u4ee5\u58f0\u660e\u5171\u4eab\u540c\u4e00\u4e2a Volume\u3002\u51e1\u662f\u8c03\u5ea6\u3001\u7f51\u7edc\u3001\u5b58\u50a8\uff0c\u4ee5\u53ca\u5b89\u5168\u76f8\u5173\u7684\u5c5e\u6027\uff0c\u57fa\u672c\u4e0a\u662f Pod \u7ea7\u522b\u7684\uff0c\u800c\u5bb9\u5668\u5c31\u6210\u4e3aPod\u5c5e\u6027\u4e2d\u4e00\u4e2a\u666e\u901a\u7684\u5b57\u6bb5\u5b9a\u4e49\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff1a\u5bb9\u5668\u662f\u76f8\u5f53\u4e8e\u672a\u6765\u4e91\u8ba1\u7b97\u7684\u8fdb\u7a0b\uff0c\u955c\u50cf\u662f\u5b89\u88c5\u5305\uff0cPod\u5219\u662f\u4f20\u7edf\u73af\u5883\u7684\u673a\u5668\uff0ck8s\u662f\u64cd\u4f5c\u7cfb\u7edf\u3002pod\u662f\u4e00\u4e2a\u5c0f\u5bb6\u5ead\uff0c\u5b83\u628a\u5bc6\u4e0d\u53ef\u5206\u7684\u5bb6\u5ead\u6210\u5458(container)\u805a\u5728\u4e00\u8d77\uff0cInfra container\u5219\u662f\u5bb6\u957f\uff0c\u638c\u7ba1\u5bb6\u4e2d\u5171\u901a\u8d44\u6e90\uff0c\u5bb6\u5ead\u6210\u5458\u901a\u8fc7sidecar\u65b9\u5f0f\u4e92\u5e2e\u4e92\u52a9\u3002<\/p>\n<h4>\u4e8c. Pod\u7684\u7f51\u7edc\u901a\u4fe1Infra\u5bb9\u5668<\/h4>\n<p>\u5728 Kubernetes \u9879\u76ee\u91cc\uff0cPod \u7684\u5b9e\u73b0\u9700\u8981\u4f7f\u7528\u4e00\u4e2a\u4e2d\u95f4\u5bb9\u5668\uff0c\u8fd9\u4e2a\u5bb9\u5668\u53eb\u4f5c Infra \u5bb9\u5668\u3002\u5728\u8fd9\u4e2a Pod \u4e2d\uff0cInfra \u5bb9\u5668\u6c38\u8fdc\u90fd\u662f\u7b2c\u4e00\u4e2a\u88ab\u521b\u5efa\u7684\u5bb9\u5668\uff0c\u800c\u5176\u4ed6\u7528\u6237\u5b9a\u4e49\u7684\u5bb9\u5668\uff0c\u5219\u901a\u8fc7 Join Network Namespace \u7684\u65b9\u5f0f\uff0c\u4e0e Infra \u5bb9\u5668\u5173\u8054\u5728\u4e00\u8d77\u3002\u8fd9\u6837\u7684\u7ec4\u7ec7\u5173\u7cfb\uff0c\u53ef\u4ee5\u7528\u4e0b\u9762\u8fd9\u6837\u4e00\u4e2a\u793a\u610f\u56fe\u6765\u8868\u8fbe\uff1a<\/p>\n<div class=\\\"image-package\\\">\n<div class=\\\"image-container\\\">\n<div class=\\\"image-container-fill\\\"><\/div>\n<div class=\\\"image-view\\\" data-width=\\\"490\\\" data-height=\\\"665\\\"><img class=\\\"\\\" src=\\\"\/\/upload-images.jianshu.io\/upload_images\/9644303-8efe7dfc0c6358d5.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/490\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/9644303-8efe7dfc0c6358d5.png\\\" data-original-width=\\\"490\\\" data-original-height=\\\"665\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"59677\\\" data-image-index=\\\"0\\\" \/><\/div>\n<\/div>\n<\/div>\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u8fd9\u4e2a Pod \u91cc\u6709\u4e24\u4e2a\u7528\u6237\u5bb9\u5668 A \u548c B\uff0c\u8fd8\u6709\u4e00\u4e2a Infra \u5bb9\u5668\u3002\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u5728 Kubernetes \u9879\u76ee\u91cc\uff0cInfra \u5bb9\u5668\u4e00\u5b9a\u8981\u5360\u7528\u6781\u5c11\u7684\u8d44\u6e90\uff0c\u6240\u4ee5\u5b83\u4f7f\u7528\u7684\u662f\u4e00\u4e2a\u975e\u5e38\u7279\u6b8a\u7684\u955c\u50cf\uff0c\u53eb\u4f5c\uff1ak8s.gcr.io\/pause\u3002\u8fd9\u4e2a\u955c\u50cf\u662f\u4e00\u4e2a\u7528\u6c47\u7f16\u8bed\u8a00\u7f16\u5199\u7684\u3001\u6c38\u8fdc\u5904\u4e8e\u201c\u6682\u505c\u201d\u72b6\u6001\u7684\u5bb9\u5668\uff0c\u89e3\u538b\u540e\u7684\u5927\u5c0f\u4e5f\u53ea\u6709 100~200 KB \u5de6\u53f3\u3002\u800c\u5728 Infra \u5bb9\u5668\u201cHold \u4f4f\u201dNetwork Namespace \u540e\uff0c\u7528\u6237\u5bb9\u5668\u5c31\u53ef\u4ee5\u52a0\u5165\u5230 Infra \u5bb9\u5668\u7684 Network Namespace \u5f53\u4e2d\u4e86<\/p>\n<ul>\n<li>\u8fd9\u4e5f\u5c31\u610f\u5473\u7740\uff0c\u5bf9\u4e8e Pod \u91cc\u7684\u5bb9\u5668 A \u548c\u5bb9\u5668 B \u6765\u8bf4\uff1a<\/li>\n<li>\u5b83\u4eec\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 localhost \u8fdb\u884c\u901a\u4fe1\uff1b<\/li>\n<li>\u5b83\u4eec\u770b\u5230\u7684\u7f51\u7edc\u8bbe\u5907\u8ddf Infra \u5bb9\u5668\u770b\u5230\u7684\u5b8c\u5168\u4e00\u6837\uff1b<\/li>\n<li>\u4e00\u4e2a Pod \u53ea\u6709\u4e00\u4e2a IP \u5730\u5740\uff0c\u4e5f\u5c31\u662f\u8fd9\u4e2a Pod \u7684 Network Namespace \u5bf9\u5e94\u7684 IP \u5730\u5740\uff1b<\/li>\n<li>\u5f53\u7136\uff0c\u5176\u4ed6\u7684\u6240\u6709\u7f51\u7edc\u8d44\u6e90\uff0c\u90fd\u662f\u4e00\u4e2a Pod \u4e00\u4efd\uff0c\u5e76\u4e14\u88ab\u8be5 Pod \u4e2d\u7684\u6240\u6709\u5bb9\u5668\u5171\u4eab\uff1b<\/li>\n<li>Pod \u7684\u751f\u547d\u5468\u671f\u53ea\u8ddf Infra \u5bb9\u5668\u4e00\u81f4\uff0c\u800c\u4e0e\u5bb9\u5668 A \u548c B \u65e0\u5173\u3002<\/li>\n<\/ul>\n<p>\u800c\u5bf9\u4e8e\u540c\u4e00\u4e2a Pod \u91cc\u9762\u7684\u6240\u6709\u7528\u6237\u5bb9\u5668\u6765\u8bf4\uff0c\u5b83\u4eec\u7684\u8fdb\u51fa\u6d41\u91cf\uff0c\u4e5f\u53ef\u4ee5\u8ba4\u4e3a\u90fd\u662f\u901a\u8fc7 Infra \u5bb9\u5668\u5b8c\u6210\u7684\u3002\u8fd9\u4e00\u70b9\u5f88\u91cd\u8981\uff0c\u56e0\u4e3a\u5c06\u6765\u5982\u679c\u4f60\u8981\u4e3a Kubernetes \u5f00\u53d1\u4e00\u4e2a\u7f51\u7edc\u63d2\u4ef6\u65f6\uff0c\u5e94\u8be5\u91cd\u70b9\u8003\u8651\u7684\u662f\u5982\u4f55\u914d\u7f6e\u8fd9\u4e2a Pod \u7684 Network Namespace\uff0c\u800c\u4e0d\u662f\u6bcf\u4e00\u4e2a\u7528\u6237\u5bb9\u5668\u5982\u4f55\u4f7f\u7528\u4f60\u7684\u7f51\u7edc\u914d\u7f6e\uff0c\u8fd9\u662f\u6ca1\u6709\u610f\u4e49\u7684\u3002<br \/>\n\u8fd9\u5c31\u610f\u5473\u7740\uff0c\u5982\u679c\u4f60\u7684\u7f51\u7edc\u63d2\u4ef6\u9700\u8981\u5728\u5bb9\u5668\u91cc\u5b89\u88c5\u67d0\u4e9b\u5305\u6216\u8005\u914d\u7f6e\u624d\u80fd\u5b8c\u6210\u7684\u8bdd\uff0c\u662f\u4e0d\u53ef\u53d6\u7684\uff1aInfra \u5bb9\u5668\u955c\u50cf\u7684 rootfs \u91cc\u51e0\u4e4e\u4ec0\u4e48\u90fd\u6ca1\u6709\uff0c\u6ca1\u6709\u4f60\u968f\u610f\u53d1\u6325\u7684\u7a7a\u95f4\u3002\u5f53\u7136\uff0c\u8fd9\u540c\u65f6\u4e5f\u610f\u5473\u7740\u4f60\u7684\u7f51\u7edc\u63d2\u4ef6\u5b8c\u5168\u4e0d\u5fc5\u5173\u5fc3\u7528\u6237\u5bb9\u5668\u7684\u542f\u52a8\u4e0e\u5426\uff0c\u800c\u53ea\u9700\u8981\u5173\u6ce8\u5982\u4f55\u914d\u7f6e Pod\uff0c\u4e5f\u5c31\u662f Infra \u5bb9\u5668\u7684 Network Namespace \u5373\u53ef\u3002<\/p>\n<h4>\u4e09. \u4f34\u751f\u5bb9\u5668\u4e0e\u5bb9\u5668\u521d\u59cb\u5316<\/h4>\n<ul>\n<li>sidecar\uff1a \u4f34\u751f\u5bb9\u5668\uff0c\u6307\u7684\u5c31\u662f\u6211\u4eec\u53ef\u4ee5\u5728\u4e00\u4e2a Pod \u4e2d\uff0c\u542f\u52a8\u4e00\u4e2a\u8f85\u52a9\u5bb9\u5668\uff0c\u6765\u5b8c\u6210\u4e00\u4e9b\u72ec\u7acb\u4e8e\u4e3b\u8fdb\u7a0b\uff08\u4e3b\u5bb9\u5668\uff09\u4e4b\u5916\u7684\u5de5\u4f5c\u3002<\/li>\n<li>Init Container\uff1a\u521d\u59cb\u5316\u5bb9\u5668 \u5c31\u662f\u7528\u6765\u505a\u521d\u59cb\u5316\u5de5\u4f5c\u7684\u5bb9\u5668\uff0c\u53ef\u4ee5\u662f\u4e00\u4e2a\u6216\u8005\u591a\u4e2a\uff0c\u5982\u679c\u6709\u591a\u4e2a\u7684\u8bdd\uff0c\u8fd9\u4e9b\u5bb9\u5668\u4f1a\u6309\u5b9a\u4e49\u7684\u987a\u5e8f\u4f9d\u6b21\u6267\u884c\uff0c\u53ea\u6709\u6240\u6709\u7684Init Container\u6267\u884c\u5b8c\u540e\uff0c\u4e3b\u5bb9\u5668\u624d\u4f1a\u88ab\u542f\u52a8\u3002\u6211\u4eec\u77e5\u9053\u4e00\u4e2aPod\u91cc\u9762\u7684\u6240\u6709\u5bb9\u5668\u662f\u5171\u4eab\u6570\u636e\u5377\u548c\u7f51\u7edc\u547d\u540d\u7a7a\u95f4\u7684\uff0c\u6240\u4ee5Init Container\u91cc\u9762\u4ea7\u751f\u7684\u6570\u636e\u53ef\u4ee5\u88ab\u4e3b\u5bb9\u5668\u4f7f\u7528\u5230\u7684\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff1a\u6211\u4eec\u73b0\u5728\u6709\u4e00\u4e2a Java Web \u5e94\u7528\u7684 WAR \u5305\uff0c\u5b83\u9700\u8981\u88ab\u653e\u5728 Tomcat \u7684 webapps \u76ee\u5f55\u4e0b\u8fd0\u884c\u8d77\u6765\u3002\u5047\u5982\uff0c\u4f60\u73b0\u5728\u53ea\u80fd\u7528 Docker \u6765\u505a\u8fd9\u4ef6\u4e8b\u60c5\uff0c\u90a3\u8be5\u5982\u4f55\u5904\u7406\u8fd9\u4e2a\u7ec4\u5408\u5173\u7cfb\u5462\uff1f<\/p>\n<ul>\n<li>\u4e00\u79cd\u65b9\u6cd5\u662f\uff0c\u628a WAR \u5305\u76f4\u63a5\u653e\u5728 Tomcat \u955c\u50cf\u7684 webapps \u76ee\u5f55\u4e0b\uff0c\u505a\u6210\u4e00\u4e2a\u65b0\u7684\u955c\u50cf\u8fd0\u884c\u8d77\u6765\u3002\u53ef\u662f\uff0c\u8fd9\u65f6\u5019\uff0c\u5982\u679c\u4f60\u8981\u66f4\u65b0 WAR \u5305\u7684\u5185\u5bb9\uff0c\u6216\u8005\u8981\u5347\u7ea7 Tomcat \u955c\u50cf\uff0c\u5c31\u8981\u91cd\u65b0\u5236\u4f5c\u4e00\u4e2a\u65b0\u7684\u53d1\u5e03\u955c\u50cf\uff0c\u975e\u5e38\u9ebb\u70e6\u3002<\/li>\n<li>\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\uff0c\u4f60\u538b\u6839\u513f\u4e0d\u7ba1 WAR \u5305\uff0c\u6c38\u8fdc\u53ea\u53d1\u5e03\u4e00\u4e2a Tomcat \u5bb9\u5668\u3002\u4e0d\u8fc7\uff0c\u8fd9\u4e2a\u5bb9\u5668\u7684 webapps \u76ee\u5f55\uff0c\u5c31\u5fc5\u987b\u58f0\u660e\u4e00\u4e2a hostPath \u7c7b\u578b\u7684 Volume\uff0c\u4ece\u800c\u628a\u5bbf\u4e3b\u673a\u4e0a\u7684 WAR \u5305\u6302\u8f7d\u8fdb Tomcat \u5bb9\u5668\u5f53\u4e2d\u8fd0\u884c\u8d77\u6765\u3002\u4e0d\u8fc7\uff0c\u8fd9\u6837\u4f60\u5c31\u5fc5\u987b\u8981\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898\uff0c\u5373\uff1a\u5982\u4f55\u8ba9\u6bcf\u4e00\u53f0\u5bbf\u4e3b\u673a\uff0c\u90fd\u9884\u5148\u51c6\u5907\u597d\u8fd9\u4e2a\u5b58\u50a8\u6709 WAR \u5305\u7684\u76ee\u5f55\u5462\uff1f\u8fd9\u6837\u6765\u770b\uff0c\u4f60\u53ea\u80fd\u72ec\u7acb\u7ef4\u62a4\u4e00\u5957\u5206\u5e03\u5f0f\u5b58\u50a8\u7cfb\u7edf\u4e86\u3002<\/li>\n<\/ul>\n<p>\u5b9e\u9645\u4e0a\uff0c\u6709\u4e86 Pod \u4e4b\u540e\uff0c\u8fd9\u6837\u7684\u95ee\u9898\u5c31\u5f88\u5bb9\u6613\u89e3\u51b3\u4e86\u3002\u6211\u4eec\u53ef\u4ee5\u628a WAR \u5305\u548c Tomcat \u5206\u522b\u505a\u6210\u955c\u50cf\uff0c\u7136\u540e\u628a\u5b83\u4eec\u4f5c\u4e3a\u4e00\u4e2a Pod \u91cc\u7684\u4e24\u4e2a\u5bb9\u5668\u201c\u7ec4\u5408\u201d\u5728\u4e00\u8d77\u3002\u8fd9\u4e2a Pod \u7684\u914d\u7f6e\u6587\u4ef6\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<div>\n<pre>apiVersion: v1\nkind: Pod\nmetadata:\n  name: javaweb-2\nspec:\n  initContainers:\n  - image: geektime\/sample:v2\n    name: war\n    command: [\\\"cp\\\", \\\"\/sample.war\\\", \\\"\/app\\\"]\n    volumeMounts:\n    - mountPath: \/app\n      name: app-volume\n  containers:\n  - image: geektime\/tomcat:7.0\n    name: tomcat\n    command: [\\\"sh\\\",\\\"-c\\\",\\\"\/root\/apache-tomcat-7.0.42-v2\/bin\/start.sh\\\"]\n    volumeMounts:\n    - mountPath: \/root\/apache-tomcat-7.0.42-v2\/webapps\n      name: app-volume\n    ports:\n    - containerPort: 8080\n      hostPort: 8001\n  volumes:\n  - name: app-volume\n    emptyDir: {}\n<\/pre>\n<\/div>\n<p>\u5728\u8fd9\u4e2a Pod \u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e24\u4e2a\u5bb9\u5668\uff0c\u7b2c\u4e00\u4e2a\u5bb9\u5668\u4f7f\u7528\u7684\u955c\u50cf\u662fgeektime\/sample:v2\uff0c\u8fd9\u4e2a\u955c\u50cf\u91cc\u53ea\u6709\u4e00\u4e2a WAR \u5305\uff08sample.war\uff09\u653e\u5728\u6839\u76ee\u5f55\u4e0b\u3002\u800c\u7b2c\u4e8c\u4e2a\u5bb9\u5668\u5219\u4f7f\u7528\u7684\u662f\u4e00\u4e2a\u6807\u51c6\u7684 Tomcat \u955c\u50cf\u3002<br \/>\n\u4e0d\u8fc7\uff0c\u4f60\u53ef\u80fd\u5df2\u7ecf\u6ce8\u610f\u5230\uff0cWAR \u5305\u5bb9\u5668\u7684\u7c7b\u578b\u4e0d\u518d\u662f\u4e00\u4e2a\u666e\u901a\u5bb9\u5668\uff0c\u800c\u662f\u4e00\u4e2a Init Container \u7c7b\u578b\u7684\u5bb9\u5668\u3002\u5728 Pod \u4e2d\uff0c\u6240\u6709 Init Container \u5b9a\u4e49\u7684\u5bb9\u5668\uff0c\u90fd\u4f1a\u6bd4 spec.containers \u5b9a\u4e49\u7684\u7528\u6237\u5bb9\u5668\u5148\u542f\u52a8\u3002\u5e76\u4e14\uff0cInit Container \u5bb9\u5668\u4f1a\u6309\u987a\u5e8f\u9010\u4e00\u542f\u52a8\uff0c\u800c\u76f4\u5230\u5b83\u4eec\u90fd\u542f\u52a8\u5e76\u4e14\u9000\u51fa\u4e86\uff0c\u7528\u6237\u5bb9\u5668\u624d\u4f1a\u542f\u52a8\u3002<br \/>\n\u6240\u4ee5\uff0c\u8fd9\u4e2a Init Container \u7c7b\u578b\u7684 WAR \u5305\u5bb9\u5668\u542f\u52a8\u540e\uff0c\u6211\u6267\u884c\u4e86\u4e00\u53e5\\&#8221;cp \/sample.war \/app\\&#8221;\uff0c\u628a\u5e94\u7528\u7684 WAR \u5305\u62f7\u8d1d\u5230 \/app \u76ee\u5f55\u4e0b\uff0c\u7136\u540e\u9000\u51fa\u3002\u800c\u540e\u8fd9\u4e2a \/app \u76ee\u5f55\uff0c\u5c31\u6302\u8f7d\u4e86\u4e00\u4e2a\u540d\u53eb app-volume \u7684 Volume\u3002\u63a5\u4e0b\u6765\u5c31\u5f88\u5173\u952e\u4e86\u3002Tomcat \u5bb9\u5668\uff0c\u540c\u6837\u58f0\u660e\u4e86\u6302\u8f7d app-volume \u5230\u81ea\u5df1\u7684 webapps \u76ee\u5f55\u4e0b\u3002\u6240\u4ee5\uff0c\u7b49 Tomcat \u5bb9\u5668\u542f\u52a8\u65f6\uff0c\u5b83\u7684 webapps \u76ee\u5f55\u4e0b\u5c31\u4e00\u5b9a\u4f1a\u5b58\u5728 sample.war \u6587\u4ef6\uff1a\u8fd9\u4e2a\u6587\u4ef6\u6b63\u662f WAR \u5305\u5bb9\u5668\u542f\u52a8\u65f6\u62f7\u8d1d\u5230\u8fd9\u4e2a Volume \u91cc\u9762\u7684\uff0c\u800c\u8fd9\u4e2a Volume \u662f\u88ab\u8fd9\u4e24\u4e2a\u5bb9\u5668\u5171\u4eab\u7684\u3002<br \/>\n\u50cf\u8fd9\u6837\uff0c\u6211\u4eec\u5c31\u7528\u4e00\u79cd\u201c\u7ec4\u5408\u201d\u65b9\u5f0f\uff0c\u89e3\u51b3\u4e86 WAR \u5305\u4e0e Tomcat \u5bb9\u5668\u4e4b\u95f4\u8026\u5408\u5173\u7cfb\u7684\u95ee\u9898\u3002\u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e2a\u6240\u8c13\u7684\u201c\u7ec4\u5408\u201d\u64cd\u4f5c\uff0c\u6b63\u662f\u5bb9\u5668\u8bbe\u8ba1\u6a21\u5f0f\u91cc\u6700\u5e38\u7528\u7684\u4e00\u79cd\u6a21\u5f0f\uff0c\u5b83\u7684\u540d\u5b57\u53eb\uff1asidecar\u3002<br \/>\n\u5728\u6211\u4eec\u7684\u8fd9\u4e2a\u5e94\u7528 Pod \u4e2d\uff0cTomcat \u5bb9\u5668\u662f\u6211\u4eec\u8981\u4f7f\u7528\u7684\u4e3b\u5bb9\u5668\uff0c\u800c WAR \u5305\u5bb9\u5668\u7684\u5b58\u5728\uff0c\u53ea\u662f\u4e3a\u4e86\u7ed9\u5b83\u63d0\u4f9b\u4e00\u4e2a WAR \u5305\u800c\u5df2\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u7528 Init Container\u521d\u59cb\u5316\u5bb9\u5668\u7684\u65b9\u5f0f\u4f18\u5148\u8fd0\u884c WAR \u5305\u5bb9\u5668\uff0c\u626e\u6f14\u4e86\u4e00\u4e2a sidecar \u7684\u89d2\u8272\u3002<\/p>\n<h4>\u56db. Pod\u7684\u751f\u547d\u5468\u671f\u72b6\u6001<\/h4>\n<ul>\n<li>Pending\u3002\u8fd9\u4e2a\u72b6\u6001\u610f\u5473\u7740\uff0cPod \u7684 YAML \u6587\u4ef6\u5df2\u7ecf\u63d0\u4ea4\u7ed9\u4e86 Kubernetes\uff0cAPI \u5bf9\u8c61\u5df2\u7ecf\u88ab\u521b\u5efa\u5e76\u4fdd\u5b58\u5728 Etcd \u5f53\u4e2d\u3002\u4f46\u662f\uff0c\u8fd9\u4e2a Pod \u91cc\u6709\u4e9b\u5bb9\u5668\u56e0\u4e3a\u67d0\u79cd\u539f\u56e0\u800c\u4e0d\u80fd\u88ab\u987a\u5229\u521b\u5efa\u3002\u6bd4\u5982\uff0c\u8c03\u5ea6\u4e0d\u6210\u529f\u3002<\/li>\n<li>Running\u3002\u8fd9\u4e2a\u72b6\u6001\u4e0b\uff0cPod\u5df2\u7ecf\u8c03\u5ea6\u6210\u529f\uff0c\u8ddf\u4e00\u4e2a\u5177\u4f53\u7684\u8282\u70b9\u7ed1\u5b9a\u3002\u5b83\u5305\u542b\u7684\u5bb9\u5668\u90fd\u5df2\u7ecf\u521b\u5efa\u6210\u529f\uff0c\u5e76\u4e14\u81f3\u5c11\u6709\u4e00\u4e2a\u6b63\u5728\u8fd0\u884c\u4e2d\u3002<\/li>\n<li>Succeeded\u3002\u8fd9\u4e2a\u72b6\u6001\u610f\u5473\u7740\uff0cPod \u91cc\u7684\u6240\u6709\u5bb9\u5668\u90fd\u6b63\u5e38\u8fd0\u884c\u5b8c\u6bd5\uff0c\u5e76\u4e14\u5df2\u7ecf\u9000\u51fa\u4e86\u3002\u8fd9\u79cd\u60c5\u51b5\u5728\u8fd0\u884c\u4e00\u6b21\u6027\u4efb\u52a1\u65f6\u6700\u4e3a\u5e38\u89c1\u3002<\/li>\n<li>Failed\u3002\u8fd9\u4e2a\u72b6\u6001\u4e0b\uff0cPod \u91cc\u81f3\u5c11\u6709\u4e00\u4e2a\u5bb9\u5668\u4ee5\u4e0d\u6b63\u5e38\u7684\u72b6\u6001\uff08\u975e 0 \u7684\u8fd4\u56de\u7801\uff09\u9000\u51fa\u3002\u8fd9\u4e2a\u72b6\u6001\u7684\u51fa\u73b0\uff0c\u610f\u5473\u7740\u4f60\u5f97\u60f3\u529e\u6cd5 Debug \u8fd9\u4e2a\u5bb9\u5668\u7684\u5e94\u7528\uff0c\u6bd4\u5982\u67e5\u770b Pod \u7684 Events \u548c\u65e5\u5fd7\u3002<\/li>\n<li>Unknown\u3002\u8fd9\u662f\u4e00\u4e2a\u5f02\u5e38\u72b6\u6001\uff0c\u610f\u5473\u7740 Pod \u7684\u72b6\u6001\u4e0d\u80fd\u6301\u7eed\u5730\u88ab kubelet \u6c47\u62a5\u7ed9 kube-apiserver\uff0c\u8fd9\u5f88\u6709\u53ef\u80fd\u662f\u4e3b\u4ece\u8282\u70b9\uff08Master \u548c Kubelet\uff09\u95f4\u7684\u901a\u4fe1\u51fa\u73b0\u4e86\u95ee\u9898\u3002<\/li>\n<\/ul>\n<h4>\u4e94. Pod\u7684\u94a9\u5b50Hook<\/h4>\n<p>Kubernetes \u4e3a\u6211\u4eec\u7684\u5bb9\u5668\u63d0\u4f9b\u4e86\u751f\u547d\u5468\u671f\u94a9\u5b50\u7684\uff0c\u5c31\u662f\u6211\u4eec\u8bf4\u7684Pod Hook\uff0cPod Hook \u662f\u7531 kubelet \u53d1\u8d77\u7684\uff0c\u5f53\u5bb9\u5668\u4e2d\u7684\u8fdb\u7a0b\u542f\u52a8\u524d\u6216\u8005\u5bb9\u5668\u4e2d\u7684\u8fdb\u7a0b\u7ec8\u6b62\u4e4b\u524d\u8fd0\u884c\uff0c\u8fd9\u662f\u5305\u542b\u5728\u5bb9\u5668\u7684\u751f\u547d\u5468\u671f\u4e4b\u4e2d\u3002\u6211\u4eec\u53ef\u4ee5\u540c\u65f6\u4e3a Pod \u4e2d\u7684\u6240\u6709\u5bb9\u5668\u90fd\u914d\u7f6e hook\u3002<br \/>\nKubernetes \u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u4e24\u79cd\u94a9\u5b50\u51fd\u6570\uff1a<\/p>\n<ul>\n<li>PostStart\uff1a\u8fd9\u4e2a\u94a9\u5b50\u5728\u5bb9\u5668\u521b\u5efa\u540e\u7acb\u5373\u6267\u884c\u3002\u4f46\u662f\uff0c\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u94a9\u5b50\u5c06\u5728\u5bb9\u5668ENTRYPOINT\u4e4b\u524d\u8fd0\u884c\uff0c\u56e0\u4e3a\u6ca1\u6709\u53c2\u6570\u4f20\u9012\u7ed9\u5904\u7406\u7a0b\u5e8f\u3002\u4e3b\u8981\u7528\u4e8e\u8d44\u6e90\u90e8\u7f72\u3001\u73af\u5883\u51c6\u5907\u7b49\u3002\u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\u7684\u662f\u5982\u679c\u94a9\u5b50\u82b1\u8d39\u592a\u957f\u65f6\u95f4\u4ee5\u81f3\u4e8e\u4e0d\u80fd\u8fd0\u884c\u6216\u8005\u6302\u8d77\uff0c \u5bb9\u5668\u5c06\u4e0d\u80fd\u8fbe\u5230running\u72b6\u6001\u3002<\/li>\n<li>PreStop\uff1a\u8fd9\u4e2a\u94a9\u5b50\u5728\u5bb9\u5668\u7ec8\u6b62\u4e4b\u524d\u7acb\u5373\u88ab\u8c03\u7528\u3002\u5b83\u662f\u963b\u585e\u7684\uff0c\u610f\u5473\u7740\u5b83\u662f\u540c\u6b65\u7684\uff0c \u6240\u4ee5\u5b83\u5fc5\u987b\u5728\u5220\u9664\u5bb9\u5668\u7684\u8c03\u7528\u53d1\u51fa\u4e4b\u524d\u5b8c\u6210\u3002\u4e3b\u8981\u7528\u4e8e\u4f18\u96c5\u5173\u95ed\u5e94\u7528\u7a0b\u5e8f\u3001\u901a\u77e5\u5176\u4ed6\u7cfb\u7edf\u7b49\u3002\u5982\u679c\u94a9\u5b50\u5728\u6267\u884c\u671f\u95f4\u6302\u8d77\uff0c Pod\u9636\u6bb5\u5c06\u505c\u7559\u5728running\u72b6\u6001\u5e76\u4e14\u6c38\u4e0d\u4f1a\u8fbe\u5230failed\u72b6\u6001\u3002<br \/>\n\u5982\u679cPostStart\u6216\u8005PreStop\u94a9\u5b50\u5931\u8d25\uff0c \u5b83\u4f1a\u6740\u6b7b\u5bb9\u5668\u3002\u6240\u4ee5\u6211\u4eec\u5e94\u8be5\u8ba9\u94a9\u5b50\u51fd\u6570\u5c3d\u53ef\u80fd\u7684\u8f7b\u91cf\u3002\u5f53\u7136\u6709\u4e9b\u60c5\u51b5\u4e0b\uff0c\u957f\u65f6\u95f4\u8fd0\u884c\u547d\u4ee4\u662f\u5408\u7406\u7684\uff0c \u6bd4\u5982\u5728\u505c\u6b62\u5bb9\u5668\u4e4b\u524d\u9884\u5148\u4fdd\u5b58\u72b6\u6001\u3002<\/li>\n<\/ul>\n<p>\u53e6\u5916\u6211\u4eec\u6709\u4e24\u79cd\u65b9\u5f0f\u6765\u5b9e\u73b0\u4e0a\u9762\u7684\u94a9\u5b50\u51fd\u6570\uff1a<\/p>\n<ul>\n<li>Exec &#8211; \u7528\u4e8e\u6267\u884c\u4e00\u6bb5\u7279\u5b9a\u7684\u547d\u4ee4\uff0c\u4e0d\u8fc7\u8981\u6ce8\u610f\u7684\u662f\u8be5\u547d\u4ee4\u6d88\u8017\u7684\u8d44\u6e90\u4f1a\u88ab\u8ba1\u5165\u5bb9\u5668\u3002<\/li>\n<li>HTTP &#8211; \u5bf9\u5bb9\u5668\u4e0a\u7684\u7279\u5b9a\u7684\u7aef\u70b9\u6267\u884cHTTP\u8bf7\u6c42<br \/>\n\u793a\u4f8b<\/li>\n<\/ul>\n<div>\n<pre>apiVersion: v1\nkind: Pod\nmetadata:\n  name: lifecycle-demo\nspec:\n  containers:\n  - name: lifecycle-demo-container\n    image: nginx\n    lifecycle:\n      postStart:\n        exec:\n          command: [\\\"\/bin\/sh\\\", \\\"-c\\\", \\\"echo Hello from the postStart handler &gt; \/usr\/share\/message\\\"]\n      preStop:\n        exec:\n          command: [\\\"\/usr\/sbin\/nginx\\\",\\\"-s\\\",\\\"quit\\\"]\n<\/pre>\n<\/div>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5728\u5bb9\u5668\u6210\u529f\u542f\u52a8\u4e4b\u540e\u5b9a\u4e49\u4e86Lifecycle\u5b57\u6bb5\uff0c\u5373\u5728 \/usr\/share\/message \u91cc\u5199\u5165\u4e86\u4e00\u53e5\u201c\u6b22\u8fce\u4fe1\u606f\u201d\uff08\u5373 postStart \u5b9a\u4e49\u7684\u64cd\u4f5c\uff09\u3002\u800c\u5728\u8fd9\u4e2a\u5bb9\u5668\u88ab\u5220\u9664\u4e4b\u524d\uff0c\u6211\u4eec\u5219\u5148\u8c03\u7528\u4e86 nginx \u7684\u9000\u51fa\u6307\u4ee4\uff08\u5373 preStop \u5b9a\u4e49\u7684\u64cd\u4f5c\uff09\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u5bb9\u5668\u7684\u201c\u4f18\u96c5\u9000\u51fa\u201d<\/p>\n<h4>\u516d. Pod\u7684\u5065\u5eb7\u68c0\u67e5<\/h4>\n<p>\u5728 Kubernetes \u4e2d\uff0c\u4f60\u53ef\u4ee5\u4e3a Pod \u91cc\u7684\u5bb9\u5668\u5b9a\u4e49\u4e00\u4e2a\u5065\u5eb7\u68c0\u67e5\u201c\u63a2\u9488\u201d\uff08Probe\uff09\u3002\u8fd9\u6837\uff0ckubelet \u5c31\u4f1a\u6839\u636e\u8fd9\u4e2a Probe \u7684\u8fd4\u56de\u503c\u51b3\u5b9a\u8fd9\u4e2a\u5bb9\u5668\u7684\u72b6\u6001\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u4ee5\u5bb9\u5668\u8fdb\u884c\u662f\u5426\u8fd0\u884c\uff08\u6765\u81ea Docker \u8fd4\u56de\u7684\u4fe1\u606f\uff09\u4f5c\u4e3a\u4f9d\u636e\u3002\u8fd9\u79cd\u673a\u5236\uff0c\u662f\u751f\u4ea7\u73af\u5883\u4e2d\u4fdd\u8bc1\u5e94\u7528\u5065\u5eb7\u5b58\u6d3b\u7684\u91cd\u8981\u624b\u6bb5\u3002<\/p>\n<ul>\n<li>liveness probe\uff08\u5b58\u6d3b\u63a2\u9488\uff09\uff1a\u786e\u5b9a\u4f60\u7684\u5e94\u7528\u7a0b\u5e8f\u662f\u5426\u6b63\u5728\u8fd0\u884c\uff0c\u901a\u4fd7\u70b9\u5c06\u5c31\u662f\u662f\u5426\u8fd8\u6d3b\u7740\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u5982\u679c\u4f60\u7684\u7a0b\u5e8f\u4e00\u65e6\u5d29\u6e83\u4e86\uff0c Kubernetes \u5c31\u4f1a\u7acb\u523b\u77e5\u9053\u8fd9\u4e2a\u7a0b\u5e8f\u5df2\u7ecf\u7ec8\u6b62\u4e86\uff0c\u7136\u540e\u5c31\u4f1a\u91cd\u542f\u8fd9\u4e2a\u7a0b\u5e8f\u3002\u800c\u6211\u4eec\u7684 liveness probe \u7684\u76ee\u7684\u5c31\u662f\u6765\u6355\u83b7\u5230\u5f53\u524d\u5e94\u7528\u7a0b\u5e8f\u8fd8\u6ca1\u6709\u7ec8\u6b62\uff0c\u8fd8\u6ca1\u6709\u5d29\u6e83\uff0c\u5982\u679c\u51fa\u73b0\u4e86\u8fd9\u4e9b\u60c5\u51b5\uff0c\u90a3\u4e48\u5c31\u91cd\u542f\u5904\u4e8e\u8be5\u72b6\u6001\u4e0b\u7684\u5bb9\u5668\uff0c\u4f7f\u5e94\u7528\u7a0b\u5e8f\u5728\u5b58\u5728 bug \u7684\u60c5\u51b5\u4e0b\u4f9d\u7136\u80fd\u591f\u7ee7\u7eed\u8fd0\u884c\u4e0b\u53bb\u3002<\/li>\n<li>readiness probe\uff08\u53ef\u8bfb\u6027\u63a2\u9488\uff09\uff1a\u786e\u5b9a\u5bb9\u5668\u662f\u5426\u5df2\u7ecf\u5c31\u7eea\u53ef\u4ee5\u63a5\u6536\u6d41\u91cf\u8fc7\u6765\u4e86\u3002\u8fd9\u4e2a\u63a2\u9488\u901a\u4fd7\u70b9\u8bb2\u5c31\u662f\u8bf4\u662f\u5426\u51c6\u5907\u597d\u4e86\uff0c\u73b0\u5728\u53ef\u4ee5\u5f00\u59cb\u5de5\u4f5c\u4e86\u3002\u53ea\u6709\u5f53 Pod \u4e2d\u7684\u5bb9\u5668\u90fd\u5904\u4e8e\u5c31\u7eea\u72b6\u6001\u7684\u65f6\u5019 kubelet \u624d\u4f1a\u8ba4\u5b9a\u8be5 Pod \u5904\u4e8e\u5c31\u7eea\u72b6\u6001\uff0c\u56e0\u4e3a\u4e00\u4e2a Pod \u4e0b\u9762\u53ef\u80fd\u4f1a\u6709\u591a\u4e2a\u5bb9\u5668\u3002\u5f53\u7136 Pod \u5982\u679c\u5904\u4e8e\u975e\u5c31\u7eea\u72b6\u6001\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u4f1a\u5c06\u4ed6\u4ece\u6211\u4eec\u7684\u5de5\u4f5c\u961f\u5217(\u5b9e\u9645\u4e0a\u5c31\u662f\u6211\u4eec\u540e\u9762\u9700\u8981\u91cd\u70b9\u5b66\u4e60\u7684 Service)\u4e2d\u79fb\u9664\u51fa\u6765\uff0c\u8fd9\u6837\u6211\u4eec\u7684\u6d41\u91cf\u5c31\u4e0d\u4f1a\u88ab\u8def\u7531\u5230\u8fd9\u4e2a Pod \u91cc\u9762\u6765\u4e86\uff0c\u51b3\u5b9a\u7684\u8fd9\u4e2a Pod \u662f\u4e0d\u662f\u80fd\u88ab\u901a\u8fc7 Service \u7684\u65b9\u5f0f\u8bbf\u95ee\u5230\uff0c\u800c\u5e76\u4e0d\u5f71\u54cd Pod \u7684\u751f\u547d\u5468\u671f\u3002\u3002<\/li>\n<\/ul>\n<p>\u63a2\u9488\u652f\u6301\u7684\u914d\u7f6e\u65b9\u5f0f\uff1a<\/p>\n<ul>\n<li>exec\uff1a\u6267\u884c\u4e00\u6bb5\u547d\u4ee4<\/li>\n<li>http\uff1a\u68c0\u6d4b\u67d0\u4e2a http \u8bf7\u6c42<\/li>\n<li>tcpSocket\uff1a\u68c0\u67e5\u7aef\u53e3\uff0c kubelet \u5c06\u5c1d\u8bd5\u5728\u6307\u5b9a\u7aef\u53e3\u4e0a\u6253\u5f00\u5bb9\u5668\u7684\u5957\u63a5\u5b57\u3002\u5982\u679c\u53ef\u4ee5\u5efa\u7acb\u8fde\u63a5\uff0c\u5bb9\u5668\u88ab\u8ba4\u4e3a\u662f\u5065\u5eb7\u7684\uff0c\u5982\u679c\u4e0d\u80fd\u5c31\u8ba4\u4e3a\u662f\u5931\u8d25\u7684\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b<\/p>\n<div>\n<pre>apiVersion: v1\nkind: Pod\nmetadata:\n  labels:\n    test: liveness\n  name: test-liveness-exec\nspec:\n  containers:\n  - name: liveness\n    image: busybox\n    args:\n    - \/bin\/sh\n    - -c\n    - touch \/tmp\/healthy; sleep 30; rm -rf \/tmp\/healthy; sleep 600\n    livenessProbe:\n      exec:\n        command:\n        - cat\n        - \/tmp\/healthy\n      initialDelaySeconds: 5\n      periodSeconds: 5\n<\/pre>\n<\/div>\n<p>\u5728\u8fd9\u4e2a Pod \u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5bb9\u5668\u3002\u5b83\u5728\u542f\u52a8\u4e4b\u540e\u505a\u7684\u7b2c\u4e00\u4ef6\u4e8b\uff0c\u5c31\u662f\u5728 \/tmp \u76ee\u5f55\u4e0b\u521b\u5efa\u4e86\u4e00\u4e2a healthy \u6587\u4ef6\uff0c\u4ee5\u6b64\u4f5c\u4e3a\u81ea\u5df1\u5df2\u7ecf\u6b63\u5e38\u8fd0\u884c\u7684\u6807\u5fd7\u3002\u800c 30 s \u8fc7\u540e\uff0c\u5b83\u4f1a\u628a\u8fd9\u4e2a\u6587\u4ef6\u5220\u9664\u6389\u3002\u4e0e\u6b64\u540c\u65f6\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u8fd9\u6837\u7684 livenessProbe\uff08\u5065\u5eb7\u68c0\u67e5\uff09\u3002\u5b83\u7684\u7c7b\u578b\u662f exec\uff0c\u8fd9\u610f\u5473\u7740\uff0c\u5b83\u4f1a\u5728\u5bb9\u5668\u542f\u52a8\u540e\uff0c\u5728\u5bb9\u5668\u91cc\u9762\u6267\u884c\u4e00\u53e5\u6211\u4eec\u6307\u5b9a\u7684\u547d\u4ee4\uff0c\u6bd4\u5982\uff1a\u201ccat \/tmp\/healthy\u201d\u3002\u8fd9\u65f6\uff0c\u5982\u679c\u8fd9\u4e2a\u6587\u4ef6\u5b58\u5728\uff0c\u8fd9\u6761\u547d\u4ee4\u7684\u8fd4\u56de\u503c\u5c31\u662f 0\uff0cPod \u5c31\u4f1a\u8ba4\u4e3a\u8fd9\u4e2a\u5bb9\u5668\u4e0d\u4ec5\u5df2\u7ecf\u542f\u52a8\uff0c\u800c\u4e14\u662f\u5065\u5eb7\u7684\uff0c\u5982\u679c\u8fd4\u56de\u503c\u4e3a\u975e0\uff0c\u90a3\u4e48kubelet\u5c06\u4f1a\u91cd\u542f\u8fd9\u4e2a\u5bb9\u5668\u3002<code>initialDelaySeconds:5<\/code>\uff0c\u5728\u5bb9\u5668\u542f\u52a8 5 s \u540e\u5f00\u59cb\u6267\u884c\u5065\u5eb7\u68c0\u67e5\uff0c<code>periodSeconds: 5<\/code>\u6bcf 5 s \u6267\u884c\u4e00\u6b21\u3002<br \/>\n\u521b\u5efa\u8fd9\u4e2aPod\u67e5\u770b\u8fc7\u7a0b<\/p>\n<div>\n<pre>$ kubectl  get pods\ntest-liveness-exec                                                1\/1     Running            0          64s\n<\/pre>\n<\/div>\n<p>30s\u540e\u6211\u4eec\u67e5\u770bPod\u7684Event<\/p>\n<div>\n<pre>$ kubectl  describe pod test-liveness-exec\nEvents:\n  Type     Reason     Age                 From                 Message\n  ----     ------     ----                ----                 -------\n  Normal   Scheduled  2m5s                default-scheduler    Successfully assigned default\/test-liveness-exec to k8s-node01\n  Warning  Unhealthy  66s (x3 over 76s)   kubelet, k8s-node01  Liveness probe failed: cat: can\\'t open \\'\/tmp\/healthy\\': No such file or directory\n<\/pre>\n<\/div>\n<p>\u901a\u8fc7Event\u53d1\u73b0\u5065\u5eb7\u68c0\u67e5\u63a2\u67e5\u5230 \/tmp\/healthy \u5df2\u7ecf\u4e0d\u5b58\u5728\u4e86\uff0c\u6240\u4ee5\u5b83\u62a5\u544a\u5bb9\u5668\u662f\u4e0d\u5065\u5eb7\u7684\uff0c\u6211\u4eec\u5728\u770b\u4e00\u4e0bPod\u7684\u5f53\u524d\u72b6\u6001\u662f\u5426\u6b63\u5e38\uff1f<\/p>\n<div>\n<pre>$ kubectl get pods\nNAME                                                              READY   STATUS             RESTARTS   AGE\ntest-liveness-exec                                                1\/1     Running            1          1m1s\n<\/pre>\n<\/div>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230Pod\u7684\u72b6\u6001\u4ecd\u7136\u662fRunning\u6b63\u5e38\u7684\uff0c\u4f46\u662f<code>RESTARTS<\/code>\u5b57\u6bb5\u5df2\u7ecf\u75310\u5df2\u7ecf\u53d8\u62101\u4e86\uff0c\u8fd9\u662f\u56e0\u4e3aPod\u5df2\u7ecf\u88abkubelet\u91cd\u542f\u4e86\u3002<br \/>\nlivenessProbe \u4e5f\u53ef\u4ee5\u5b9a\u4e49\u4e3a\u53d1\u8d77 HTTP \u6216\u8005 TCP \u8bf7\u6c42\u7684\u65b9\u5f0f\uff0c\u5b9a\u4e49\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<div>\n<pre>livenessProbe:\n     httpGet:\n       path: \/healthz\n       port: 8080\n       httpHeaders:\n       - name: X-Custom-Header\n         value: Awesome\n       initialDelaySeconds: 3\n       periodSeconds: 3\n<\/pre>\n<\/div>\n<div class=\\\"_2Uzcx_\\\">\n<pre>    livenessProbe:\n      tcpSocket:\n        port: 8080\n      initialDelaySeconds: 15\n      periodSeconds: 20\n<\/pre>\n<\/div>\n<p>Pod \u5176\u5b9e\u53ef\u4ee5\u66b4\u9732\u4e00\u4e2a\u5065\u5eb7\u68c0\u67e5 URL\uff08\u6bd4\u5982 \/healthz\uff09\uff0c\u6216\u8005\u76f4\u63a5\u8ba9\u5065\u5eb7\u68c0\u67e5\u53bb\u68c0\u6d4b\u5e94\u7528\u7684\u76d1\u542c\u7aef\u53e3\u3002\u8fd9\u4e24\u79cd\u914d\u7f6e\u65b9\u6cd5\uff0c\u5728 Web \u670d\u52a1\u7c7b\u7684\u5e94\u7528\u4e2d\u975e\u5e38\u5e38\u7528\u3002<\/p>\n<h4>\u4e03. Pod\u7684\u6545\u969c\u6062\u590d\u673a\u5236<\/h4>\n<p>\u4e0a\u9762\u4f8b\u5b50\u4e2d\u5065\u5eb7\u68c0\u67e5\u5982\u679c\u6ca1\u6709\u901a\u8fc7\uff0ckubelet\u5219\u4f1a\u91cd\u542f\u8fd9\u4e2a\u5bb9\u5668\uff0c\u8fd9\u662f\u56e0\u4e3a\u9ed8\u8ba4Pod\u7684\u6062\u590d\u673a\u5236\u4e3aAlways\uff0c\u5176\u5b9e\u5b83\u662f Pod \u7684 Spec \u90e8\u5206\u7684\u4e00\u4e2a\u6807\u51c6\u5b57\u6bb5<code>\uff08pod.spec.restartPolicy\uff09<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u7684\u9700\u6c42\u6765\u5b9a\u901a\u8fc7\u8bbe\u7f6e restartPolicy\u6539\u53d8 Pod \u7684\u6062\u590d\u7b56\u7565\uff1a<\/p>\n<ul>\n<li>Always\uff1a\u5728\u4efb\u4f55\u60c5\u51b5\u4e0b\uff0c\u53ea\u8981\u5bb9\u5668\u4e0d\u5728\u8fd0\u884c\u72b6\u6001\uff0c\u5c31\u81ea\u52a8\u91cd\u542f\u5bb9\u5668\uff1b<\/li>\n<li>OnFailure: \u53ea\u5728\u5bb9\u5668 \u5f02\u5e38\u65f6\u624d\u81ea\u52a8\u91cd\u542f\u5bb9\u5668\uff1b<\/li>\n<li>Never: \u4ece\u6765\u4e0d\u91cd\u542f\u5bb9\u5668\u3002<\/li>\n<\/ul>\n<p>\u57fa\u672c\u7684\u8bbe\u8ba1\u539f\u7406:<\/p>\n<ol>\n<li>\u53ea\u8981 Pod \u7684 restartPolicy \u6307\u5b9a\u7684\u7b56\u7565\u5141\u8bb8\u91cd\u542f\u5f02\u5e38\u7684\u5bb9\u5668\uff08\u6bd4\u5982\uff1aAlways\uff09\uff0c\u90a3\u4e48\u8fd9\u4e2a Pod \u5c31\u4f1a\u4fdd\u6301 Running \u72b6\u6001\uff0c\u5e76\u8fdb\u884c\u5bb9\u5668\u91cd\u542f\u3002\u5426\u5219\uff0cPod \u5c31\u4f1a\u8fdb\u5165 Failed \u72b6\u6001 \u3002<\/li>\n<li>\u5bf9\u4e8e\u5305\u542b\u591a\u4e2a\u5bb9\u5668\u7684 Pod\uff0c\u53ea\u6709\u5b83\u91cc\u9762\u6240\u6709\u7684\u5bb9\u5668\u90fd\u8fdb\u5165\u5f02\u5e38\u72b6\u6001\u540e\uff0cPod \u624d\u4f1a\u8fdb\u5165 Failed \u72b6\u6001\u3002\u5728\u6b64\u4e4b\u524d\uff0cPod \u90fd\u662f Running \u72b6\u6001\u3002\u6b64\u65f6\uff0cPod \u7684 READY \u5b57\u6bb5\u4f1a\u663e\u793a\u6b63\u5e38\u5bb9\u5668\u7684\u4e2a\u6570<\/li>\n<\/ol>\n<h4>\u516b. Pod\u7684\u5e38\u7528\u5c5e\u6027\u5b9a\u4e49<\/h4>\n<p>\u9664\u4e86\u4e0a\u6587\u5b9a\u4e49\u7684\u4e00\u4e9b\u5c5e\u6027\u5b57\u6bb5\uff0c\u6211\u4eec\u5e38\u7528\u7684\u5c5e\u6027\u8fd8\u6709\u4ee5\u4e0b\u5b57\u6bb5\u5b9a\u4e49\uff1a<\/p>\n<ul>\n<li>NodeSelector\uff1a\u662f\u4e00\u4e2a\u4f9b\u7528\u6237\u5c06 Pod \u4e0e Node \u8fdb\u884c\u7ed1\u5b9a\u7684\u5b57\u6bb5<\/li>\n<li>ImagePullPolicy\uff1a[Always | Never | IfNotPresent] # \u3010String\u3011 \u6bcf\u6b21\u90fd\u5c1d\u8bd5\u91cd\u65b0\u62c9\u53d6\u955c\u50cf | \u4ec5\u4f7f\u7528\u672c\u5730\u955c\u50cf | \u5982\u679c\u672c\u5730\u6709\u955c\u50cf\u5219\u4f7f\u7528\uff0c\u6ca1\u6709\u5219\u62c9\u53d6<\/li>\n<li>Volume\uff1avolume\u662fPod\u4e2d\u591a\u4e2a\u5bb9\u5668\u8bbf\u95ee\u7684\u5171\u4eab\u76ee\u5f55\u3002volume\u88ab\u5b9a\u4e49\u5728pod\u4e0a\uff0c\u88ab\u8fd9\u4e2apod\u7684\u591a\u4e2a\u5bb9\u5668\u6302\u8f7d\u5230\u76f8\u540c\u6216\u4e0d\u540c\u7684\u8def\u5f84\u4e0b\u3002\u4e00\u822cvolume\u88ab\u7528\u4e8e\u6301\u4e45\u5316pod\u4ea7\u751f\u7684\u6570\u636e\u3002Kubernetes\u63d0\u4f9b\u4e86\u4f17\u591a\u7684volume\u7c7b\u578b\uff0c\u5305\u62ecemptyDir\u3001hostPath\u3001nfs\u3001glusterfs\u3001cephfs\u3001ceph rbd\u7b49\u3002<\/li>\n<li>NodeName\uff1a\u4e00\u65e6 Pod \u7684\u8fd9\u4e2a\u5b57\u6bb5\u88ab\u8d4b\u503c\uff0cKubernetes \u9879\u76ee\u5c31\u4f1a\u88ab\u8ba4\u4e3a\u8fd9\u4e2a Pod \u5df2\u7ecf\u7ecf\u8fc7\u4e86\u8c03\u5ea6\uff0c\u8c03\u5ea6\u7684\u7ed3\u679c\u5c31\u662f\u8d4b\u503c\u7684\u8282\u70b9\u540d\u5b57\u3002\u6240\u4ee5\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u4e00\u822c\u7531\u8c03\u5ea6\u5668\u8d1f\u8d23\u8bbe\u7f6e\uff0c\u4f46\u7528\u6237\u4e5f\u53ef\u4ee5\u8bbe\u7f6e\u5b83\u6765\u201c\u9a97\u8fc7\u201d\u8c03\u5ea6\u5668\uff0c\u5f53\u7136\u8fd9\u4e2a\u505a\u6cd5\u4e00\u822c\u662f\u5728\u6d4b\u8bd5\u6216\u8005\u8c03\u8bd5\u7684\u65f6\u5019\u624d\u4f1a\u7528\u5230\u3002<\/li>\n<li>HostAliases\uff1a\u5b9a\u4e49\u4e86 Pod \u7684 hosts \u6587\u4ef6\uff08\u6bd4\u5982 \/etc\/hosts\uff09\u91cc\u7684\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<div class=\\\"image-package\\\">\n<div class=\\\"image-container\\\">\n<div class=\\\"image-container-fill\\\"><\/div>\n<div class=\\\"image-view\\\" data-width=\\\"1025\\\" data-height=\\\"458\\\"><img class=\\\"\\\" 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class=\\\"image-package\\\">\n<div class=\\\"image-container\\\">\n<div class=\\\"image-container-fill\\\"><\/div>\n<div class=\\\"image-view\\\" data-width=\\\"1032\\\" data-height=\\\"650\\\"><img class=\\\"\\\" src=\\\"\/\/upload-images.jianshu.io\/upload_images\/9644303-629f97164c4c9533.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/1032\/format\/webp\\\" data-original-src=\\\"\/\/upload-images.jianshu.io\/upload_images\/9644303-629f97164c4c9533.png\\\" data-original-width=\\\"1032\\\" data-original-height=\\\"650\\\" data-original-format=\\\"image\/png\\\" data-original-filesize=\\\"191289\\\" data-image-index=\\\"4\\\" \/><\/div>\n<\/div>\n<div class=\\\"image-caption\\\">image.png<\/div>\n<\/div>\n<div class=\\\"image-package\\\">\n<div class=\\\"image-container\\\">\n<div class=\\\"image-container-fill\\\"><\/div>\n<div class=\\\"image-view\\\" data-width=\\\"1025\\\" data-height=\\\"614\\\"><img class=\\\"\\\" 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