{"id":2021,"date":"2021-07-10T16:10:17","date_gmt":"2021-07-10T08:10:17","guid":{"rendered":"https:\/\/9incloud.com\/?p=2021"},"modified":"2021-07-11T22:45:39","modified_gmt":"2021-07-11T14:45:39","slug":"ecs-rolling-update-zero-downtime","status":"publish","type":"post","link":"https:\/\/9incloud.com\/devops\/cicd\/ecs-rolling-update-zero-downtime","title":{"rendered":"\u6301\u7e8c\u90e8\u7f72 &#8211; \u4f7f\u7528 ECS Rolling Update \u5be6\u73fe zero downtime"},"content":{"rendered":"\n<p>\u5728 container \u5927\u884c\u5176\u9053\u7684\u73fe\u4eca\uff0ccontainerized application \u5df2\u7d93\u5f88\u5e38\u898b\u7684\u61c9\u7528\u5728\u958b\u767c\u74b0\u5883\u548c\u7dda\u4e0a\u74b0\u5883\u4e4b\u4e2d\uff0c\u800c\u9019\u7bc7\u4f86\u4ecb\u7d39\u4e00\u4e0b\uff0c ECS Cluster \u4e2d\uff0c\u4f7f\u7528 ECS Service \u642d\u914d ELB\uff0c\u7528 Rolling update \u7684\u90e8\u7f72\u65b9\u5f0f\u4f86\u9054\u6210\u4e0d\u505c\u6a5f\u7684\u66f4\u65b0\uff0c\u800c\u66f4\u9748\u6d3b\u7684\u90e8\u7f72\u65b9\u5f0f\uff0c\u5982 Blue \/ Green \u3001Canary \u7684\u90e8\u7f72\u65b9\u5f0f\uff0cAWS CodeDeploy \u4e5f\u662f\u6709\u652f\u63f4\u7684\uff0c\u4f46\u4e0d\u5728\u672c\u7bc7\u7684\u7bc4\u570d\u4e4b\u4e2d\uff0c\u9996\u5148\u4f86\u4ecb\u7d39\u4e00\u4e0b\uff0c\u4f55\u8b02 Rolling Update<\/p>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><p>\u00a0<\/p>\n<h3>Rolling Update<\/h3>\n<p>\u5c31\u5b57\u9762\u4e0a\u7684\u7fa9\u601d\u662f\u300c\u6efe\u52d5\u5f0f\u7684\u66f4\u65b0\u300d\uff0c\u4e5f\u5c31\u662f\u900f\u904e\u4e00\u7a2e\u6a5f\u5236\u4e0d\u65b7\u7684\u66ff\u63db\u66f4\u65b0\u73fe\u6709\u7684\u5bb9\u5668\uff0c\u800c\u5728\u9019\u904e\u7a0b\u4e2d\uff0c\u9700\u8981\u900f\u904e Load Balance (AWS \u7a31\u70ba ELB\uff0c\u672c\u7bc7\u7528\u7684\u7684\u662f ALB) \u4f86\u505a\u6d41\u91cf\u7684\u5207\u63db\uff0c\u800c\u820a\u5bb9\u5668\u66ff\u63db\u524d\u9700\u8981\u5148\u628a\u65e2\u6709\u7684 request \u5148\u6d88\u5316\u5b8c\uff0c\u7a31\u4e4b\u70ba\u6392\u6c34(draining)\uff0c\u4f86\u770b\u4e00\u4e0b\u793a\u610f\u5716<\/p>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200.png\"><img loading=\"lazy\" decoding=\"async\" width=\"841\" height=\"1024\" src=\"https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200-841x1024.png\" alt=\"\" class=\"wp-image-2031\" srcset=\"https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200-841x1024.png 841w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200-246x300.png 246w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200-768x935.png 768w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200-1262x1536.png 1262w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200-1683x2048.png 1683w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200-700x852.png 700w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200-570x694.png 570w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rolling-update-100-200.png 2021w\" sizes=\"(max-width: 841px) 100vw, 841px\" \/><\/a><figcaption><strong><span class=\"has-inline-color has-vivid-cyan-blue-color\">Hint: \u9ede\u5716\u53ef\u653e\u5927<\/span><\/strong><\/figcaption><\/figure>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><p>\u5148\u4f86\u770b\u4e00\u4e0b\u53c3\u6578\u7684\u5b9a\u7fa9<\/p>\n<ul>\n<li>\n<p>minimumHealthyPercent: \u5728\u90e8\u7f72\u968e\u6bb5\u6642\uff0c\u6700\u5c11\u8981\u4fdd\u7559 ECS Task \u72c0\u614b\u70ba <code>RUNNING<\/code> \u7684\u767e\u5206\u6bd4\u6578\u91cf<\/p>\n<\/li>\n<li>\n<p>maximumPercent: \u5728\u90e8\u7f72\u968e\u6bb5\u6642\uff0c\u6700\u5927\u5141\u8a31 ECS Task \u72c0\u614b\u70ba <code>RUNNING<\/code> or <code>PENDING<\/code> \u7684\u767e\u5206\u6bd4\u6578\u91cf<\/p>\n<\/li>\n<\/ul>\n<p>\u9019\u5169\u500b\u53c3\u6578\u7684\u5b9a\u7fa9\uff0c\u8a73\u7d30\u5b9a\u7fa9\u53ef\u4ee5\u53c3\u8003<a href=\"https:\/\/docs.aws.amazon.com\/AmazonECS\/latest\/APIReference\/API_DeploymentConfiguration.html\">\u5b98\u65b9\u6587\u4ef6<\/a>\u6709\u8a73\u7d30\u8aaa\u660e<\/p>\n<p><code>desired tasks<\/code> \u662f\u767e\u5206\u6bd4\u7684\u57fa\u6e96\u9ede\uff0c\u4ee5\u793a\u610f\u5716\u70ba\u5074\uff0c\u56e0\u70ba <code>minimumHealthyPercent<\/code> \u8a2d\u5b9a 100\uff0c\u6545\u90e8\u7f72\u904e\u7a0b\u4e2d running task \u4e0d\u5f97\u5c0f\u65bc 2 \u500b\uff0c\u4e5f\u5c31\u662f\u5728\u90e8\u7f72\u904e\u7a0b\u4e2d\uff0c\u81f3\u5c11\u4fdd\u6301 2 \u53f0\u662f\u53ef\u4ee5\u5c0d\u5916\u670d\u52d9\u4e0d\u4e2d\u65b7<\/p>\n<p><code>maximumPercent<\/code> \u8a2d\u5b9a 200\uff0c\u6545\u90e8\u7f72\u904e\u7a0b\u4e2d\uff0c\u65b0\u958b\u51fa\u4f86\u7684 ECS Task \u52a0\u4e0a\u539f\u6709\u7684 ECS Task\uff0c\u6700\u591a\u4e0d\u80fd\u5927\u65bc 4 \u500b<\/p>\n<p>\u518d\u4f86\u6bd4\u8f03\u91cd\u8981\u7684\u4e00\u9ede\u662f\uff0cRolling Update \u8981\u505a\u5230\u4e0d\u505c\u6a5f\u7684\u90e8\u7f72\uff0c\u5fc5\u9700\u642d\u914d Load Balance \u7684 draining \u6a5f\u5236\uff0cdraining \u662f\u6307\u820a\u5bb9\u5668\u8981\u88ab\u522a\u9664\u524d\uff0c\u5728 ALB \u6703\u5148\u505c\u6b62\u8b93\u65b0\u7684 request \u9032\u4f86\uff0c\u800c\u5df2\u7d93\u9032\u4f86\u7684 request \u4e5f\u5fc5\u9700\u6d88\u5316\u5b8c\uff0c\u9019\u5169\u500b\u52d5\u4f5c\u52a0\u8d77\u5c31\u7a31\u70ba drainin\uff0c \u800c draining \u5177\u9ad4\u4e0a\u8981\u8a2d\u5b9a\u591a\u4e45\uff0c\u662f\u53ef\u4ee5\u5728 ALB \u7684 Target Group \u4e0a\u8a2d\u5b9a\u7684\uff0c\u9019\u90e8\u5206\u5c31\u8981\u770b\u5c0d\u5916\u7684\u670d\u52d9\u4e2d\uff0c\u8996\u5be6\u969b request \u7684\u6700\u5927\u6642\u9593\u662f\u591a\u4e45\u800c\u5b9a<\/p>\n<p>\u518d\u7e7c\u7e8c\u770b\u4e00\u4e0b\u4e0d\u540c\u6578\u503c\u8a2d\u5b9a\u7684\u793a\u610f\u5716<\/p>\n<\/div>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150.png\"><img loading=\"lazy\" decoding=\"async\" width=\"672\" height=\"1024\" src=\"https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150-672x1024.png\" alt=\"\" class=\"wp-image-2041\" srcset=\"https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150-672x1024.png 672w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150-197x300.png 197w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150-768x1170.png 768w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150-1008x1536.png 1008w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150-1344x2048.png 1344w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150-700x1067.png 700w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150-570x869.png 570w, https:\/\/9incloud.com\/wp-content\/uploads\/2021\/07\/rulling-update-50-150.png 2021w\" sizes=\"(max-width: 672px) 100vw, 672px\" \/><\/a><figcaption><strong><span class=\"has-inline-color has-vivid-cyan-blue-color\">Hint: \u9ede\u5716\u53ef\u653e\u5927<\/span><\/strong><\/figcaption><\/figure>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><p>\u6bd4\u8f03\u660e\u986f\u7684\u5dee\u7570\u662f <code>minimumHealthyPercent<\/code> \u8a2d\u5b9a 50\uff0c\u6545\u90e8\u7f72\u904e\u7a0b\u4e2d running task \u6700\u5c11\u7684\u60c5\u6cc1\u53ea\u5269 1 \u500b\uff0c\u800c <code>maximumPercent<\/code> \u8a2d\u5b9a\u70ba 150, \u6240\u4ee5\u90e8\u7f72\u968e\u6bb5\u4e2d\uff0c\u6700\u591a\u540c\u6642 running task \u7684\u6578\u91cf\u70ba 3 \u53f0\uff0c\u90e8\u7f72\u6642\u5206\u5169\u6b21\u968e\u6bb5 draining\uff0c\u624d\u6703\u628a\u6574\u500b\u90e8\u7f72\u8d70\u5b8c<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><p>\u00a0<\/p>\n<h3>\u89f8\u767c\u90e8\u7f72<\/h3>\n<p>\u4e00\u822c\u90fd\u662f ECR \u63a8\u4e0a\u65b0 tag \u7248\u672c\u5f8c\uff0c\u5728 AWS Management Console \u4e2d\uff0c\u5148 Create New ECS Task Definition\uff0c\u6307\u5411\u65b0\u7684 ECR tag \u7248\u672c\u5f8c\uff0c\u518d\u5230 ECS Service \u4e2d\u76f4\u63a5\u6309\u4e0b Update\uff0c\u63db\u6210\u65b0\u7684 Task Definition \uff0c\u5c31\u6703\u76f4\u63a5\u89f8\u767c Rolling Update \u90e8\u7f72\uff0c\u7576\u7136\u9019\u662f\u624b\u52d5\u64cd\u4f5c AWS \u5f8c\u53f0\u7684\u72c0\u6cc1<\/p>\n<p>\u800c\u9019\u500b\u624b\u52d5\u90e8\u7f72\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u900f\u904e AWS CodePipeline \u5728\u505a\u81ea\u52d5\u5316\u7684 CD \u7684\u90e8\u5206\uff0c\u4e4b\u5f8c\u6703\u5beb\u4e00\u7bc7\u4f86\u5be6\u969b\u8aaa\u660e\u4e00\u4e0b\uff0c\u76ee\u524d\u5728\u6211\u7684 <a href=\"https:\/\/github.com\/kimisme9386\/lab-ecs-fargate-cd-infra\">GitHub lab-ecs-fargate-cd-infra repo<\/a> \u4e0a\u5df2\u7d93\u6709\u7528 CDK \u5be6\u73fe\uff0c\u6709\u8208\u8da3\u7684\u670b\u53cb\u53ef\u4ee5\u5148\u53c3\u8003\u4e00\u4e0b<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><p>\u00a0<\/p>\n<h3>\u6e2c\u8a66 zero downtime<\/h3>\n<p>\u5148\u6e96\u5099\u4e00\u500b\u7c21\u55ae\u7684 API request \u7a0b\u5f0f\uff0c\u4ee5\u4e0b\u7528 Python3 \u70ba\u7bc4\u4f8b<\/p>\n<\/div>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"python\" class=\"language-python\">import requests\nimport time\nimport pathlib\n\nfile_path = f\"{pathlib.Path(__file__).parents[0]}\/requests.txt\"\n\n\ndef main(file_path: str):\n    with open(file_path, \"a+\") as file:\n        for i in range(240):\n            r = requests.get(\n                'https:\/\/restapi.9incloud.com\/hello'\n            )\n            file.write(f\"{i+1}: {r.text}\\n\")\n            print(f\"response:{i+1}: {r.text}\")\n            time.sleep(500\/1000)\n\n\nif __name__ == '__main__':\n    main(file_path)\n<\/code><\/pre>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><p>\u7136\u5f8c\u4e0d\u8ad6\u7528 CodePipeline \u53bb\u81ea\u52d5\u89f8\u767c\u6216\u662f\u7528 AWS Management Console \u5f8c\u53f0\u53bb\u64cd\u4f5c\uff0c\u89f8\u767c\u5f8c\u5c31\u53ef\u4ee5 run \u9019\u500b\u6e2c\u8a66\u7a0b\u5f0f\uff0c\u6bcf\u500b API request \u9593\u9694 0.5 \u79d2\uff0c\u6301\u7e8c\u9032\u884c\u591a\u4e45\u53ef\u4ee5\u81ea\u5df1\u8a2d\u5b9a\uff0c\u9019\u908a\u8a2d\u5b9a 240\uff0c\u5927\u7d04 2 \u5206\u9418\u7684\u6642\u9593\u505a\u6e2c\u8a66\uff0cAPI response \u5c31\u5f9e\u90e8\u7f72\u66f4\u65b0\u524d\u56de\u50b3 <code>It's version: 1<\/code> \u5230 <code>It's version: 2<\/code>\uff0c\u5f88\u7c21\u55ae\u7684\u4e00\u500b\u6e2c\u8a66\u9a57\u8b49\uff0c\u5be6\u969b\u5f97\u5230\u7d50\u679c\u5982\u4e0b(\u6c92\u5168\u90e8\u5217\u51fa\uff0c\u5f9e\u5be6\u969b\u767c\u751f\u8b8a\u5316\u7684\u8cc7\u6599\u958b\u59cb)<\/p>\n<pre><code>98: It's version:1\n99: It's version:1\n100: It's version:2\n101: It's version:2\n102: It's version:1\n103: It's version:1\n104: It's version:1\n105: It's version:2\n106: It's version:1\n107: It's version:1\n108: It's version:2\n109: It's version:2\n110: It's version:1\n111: It's version:1\n112: It's version:1\n113: It's version:2\n114: It's version:1\n115: It's version:1\n116: It's version:2\n117: It's version:1\n118: It's version:2\n119: It's version:1\n120: It's version:1\n121: It's version:1\n122: It's version:2\n123: It's version:1\n124: It's version:1\n125: It's version:2\n126: It's version:1\n127: It's version:1\n128: It's version:2\n129: It's version:1\n130: It's version:2\n131: It's version:1\n132: It's version:2\n133: It's version:1\n134: It's version:1\n135: It's version:1\n136: It's version:2\n137: It's version:2\n138: It's version:2\n139: It's version:1\n140: It's version:1\n141: It's version:2\n142: It's version:2\n143: It's version:2\n144: It's version:1\n145: It's version:1\n146: It's version:1\n147: It's version:1\n148: It's version:2\n149: It's version:2\n150: It's version:1\n151: It's version:1\n152: It's version:2\n153: It's version:2\n154: It's version:2\n155: It's version:2\n156: It's version:1\n157: It's version:1\n158: It's version:1\n159: It's version:1\n160: It's version:2\n161: It's version:2\n162: It's version:2\n163: It's version:2\n164: It's version:1\n165: It's version:1\n166: It's version:2\n167: It's version:2\n168: It's version:1\n169: It's version:2\n170: It's version:2\n171: It's version:2\n172: It's version:2\n173: It's version:1\n174: It's version:2\n175: It's version:1\n176: It's version:2\n177: It's version:2\n178: It's version:1\n179: It's version:2\n180: It's version:2\n181: It's version:1\n182: It's version:2\n183: It's version:2\n184: It's version:2\n185: It's version:1\n186: It's version:2\n187: It's version:2\n188: It's version:1\n189: It's version:2\n190: It's version:1\n191: It's version:2\n192: It's version:2\n193: It's version:2\n194: It's version:2\n195: It's version:2\n196: It's version:2\n197: It's version:2\n198: It's version:2\n199: It's version:2\n200: It's version:2\n201: It's version:2\n202: It's version:2\n203: It's version:2\n204: It's version:2\n205: It's version:2\n206: It's version:2\n207: It's version:2\n208: It's version:2\n209: It's version:2\n210: It's version:2\n211: It's version:2\n212: It's version:2\n213: It's version:2\n214: It's version:2\n215: It's version:2\n216: It's version:2\n217: It's version:2\n218: It's version:2\n219: It's version:2\n220: It's version:2\n221: It's version:2\n222: It's version:2\n223: It's version:2\n224: It's version:2\n225: It's version:2\n226: It's version:2\n227: It's version:2\n228: It's version:2\n229: It's version:2\n230: It's version:2\n231: It's version:2\n232: It's version:2\n233: It's version:2\n234: It's version:2\n235: It's version:2\n236: It's version:2\n237: It's version:2\n238: It's version:2\n239: It's version:2\n240: It's version:2\n\n<\/code><\/pre>\n<p>\u5f9e\u9019\u908a\u53ef\u4ee5\u767c\u73fe\uff0c\u5728 Rolling Update \u968e\u6bb5\uff0c\u65b0\u820a\u7248\u672c\u6709\u4e00\u500b\u77ed\u66ab\u7684\u6642\u9593\u662f\u4f75\u5b58\u7684\uff0c\u4e5f\u5c31\u662f\u5728\u65b0\u589e ECS Task \u5f8c\uff0c\u5230 Draining \u524d\u7684\u9019\u6bb5\u6642\u9593\uff0c\u5c31\u6703\u5728 version1 \u548c version2 \u4e2d\u4e92\u76f8\u7a7f\u63d2\uff0c\u56e0\u70ba ALB \u7684\u6f14\u7b97\u6cd5\u662f\u7528 Round Robin\uff0c\u4e5f\u5c31\u662f\u5e73\u5747\u5206\u6563\u7d66 Target Group \u4e2d\u7684 Target<\/p>\n<p>\u800c\u5f9e ALB \u5728 Draining \u968e\u6bb5\u6642\uff0c\u5f85\u79fb\u9664\u7684\u820a ECS Task \u5c31\u4e0d\u6703\u518d\u63a5\u65b0\u7684 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