{"id":6590,"date":"2022-04-09T22:03:27","date_gmt":"2022-04-09T14:03:27","guid":{"rendered":"https:\/\/egonlin.com\/?p=6590"},"modified":"2022-04-09T22:43:10","modified_gmt":"2022-04-09T14:43:10","slug":"kubelet-%e7%9a%84-gc","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=6590","title":{"rendered":"kubelet \u7684 GC"},"content":{"rendered":"<p>\u5728\u8fd0\u884c\u4e00\u6bb5\u65f6\u5019\u4e4b\u540e\uff0c\u8282\u70b9\u4e0a\u4f1a\u4e0b\u8f7d\u5f88\u591a\u955c\u50cf\uff0c\u4e5f\u4f1a\u6709\u5f88\u591a\u56e0\u4e3a\u5404\u79cd\u539f\u56e0\u9000\u51fa\u7684\u5bb9\u5668\u3002\u4e3a\u4e86\u4fdd\u8bc1\u8282\u70b9\u80fd\u591f\u6b63\u5e38\u8fd0\u884c\uff0ckubelet \u8981\u9632\u6b62\u955c\u50cf\u592a\u591a\u5360\u6ee1\u78c1\u76d8\u7a7a\u95f4\uff0c\u4e5f\u8981\u9632\u6b62\u9000\u51fa\u7684\u5bb9\u5668\u592a\u591a\u5bfc\u81f4\u7cfb\u7edf\u8fd0\u884c\u7f13\u6162\u6216\u8005\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n<p>GC \u7684\u5de5\u4f5c\u4e0d\u9700\u8981\u624b\u52a8\u5e72\u9884\uff0ckubelet \u4f1a\u5468\u671f\u6027\u53bb\u6267\u884c\uff0c\u4e0d\u8fc7\u5728\u542f\u52a8 kubelet \u8fdb\u7a0b\u7684\u65f6\u5019\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570\u63a7\u5236 GC \u7684\u7b56\u7565\u3002kubelet\u4f1a\u542f\u52a8\u4e24\u4e2aGC\uff0c\u5206\u522b\u56de\u6536container\u548cimage\u3002\u5176\u4e2dcontainer\u7684\u56de\u6536\u9891\u7387\u4e3a1\u5206\u949f\u4e00\u6b21\uff0c\u800cimage\u56de\u6536\u9891\u7387\u4e3a5\u5206\u949f\u4e00\u6b21\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/kubelet-GC1.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/kubelet-GC1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><br \/>\n<strong>1. \u5bb9\u5668GC<\/strong><\/p>\n<p>\u9000\u51fa\u7684\u5bb9\u5668\u4e5f\u4f1a\u7ee7\u7eed\u5360\u7528\u7cfb\u7edf\u8d44\u6e90\uff0c\u6bd4\u5982\u8fd8\u4f1a\u5728\u6587\u4ef6\u7cfb\u7edf\u5b58\u50a8\u5f88\u591a\u6570\u636e\u3001docker \u5e94\u7528\u4e5f\u8981\u5360\u7528 CPU \u548c\u5185\u5b58\u53bb\u7ef4\u62a4\u8fd9\u4e9b\u5bb9\u5668\u3002docker \u672c\u8eab\u5e76\u4e0d\u4f1a\u81ea\u52a8\u5220\u9664\u5df2\u7ecf\u9000\u51fa\u7684\u5bb9\u5668\uff0c\u56e0\u6b64 kubelet \u5c31\u8d1f\u8d77\u4e86\u8fd9\u4e2a\u8d23\u4efb\u3002kubelet \u5bb9\u5668\u7684\u56de\u6536\u662f\u4e3a\u4e86\u5220\u9664\u5df2\u7ecf\u9000\u51fa\u7684\u5bb9\u5668\u4ee5\u8282\u7701\u8282\u70b9\u7684\u7a7a\u95f4\uff0c\u63d0\u5347\u6027\u80fd\u3002<\/p>\n<p>\u5bb9\u5668 GC \u867d\u7136\u6709\u5229\u4e8e\u7a7a\u95f4\u548c\u6027\u80fd\uff0c\u4f46\u662f\u5220\u9664\u5bb9\u5668\u4e5f\u4f1a\u5bfc\u81f4\u9519\u8bef\u73b0\u573a\u88ab\u6e05\u7406\uff0c\u4e0d\u5229\u4e8e debug \u548c\u9519\u8bef\u5b9a\u4f4d\uff0c\u56e0\u6b64\u4e0d\u5efa\u8bae\u628a\u6240\u6709\u9000\u51fa\u7684\u5bb9\u5668\u90fd\u5220\u9664\u3002\u56e0\u6b64\u5bb9\u5668\u7684\u6e05\u7406\u9700\u8981\u4e00\u5b9a\u7684\u7b56\u7565\uff0c\u4e3b\u8981\u662f\u544a\u8bc9 kubelet \u4f60\u8981\u4fdd\u5b58\u591a\u5c11\u5df2\u7ecf\u9000\u51fa\u7684\u5bb9\u5668\u3002\u548c\u5bb9\u5668 GC \u6709\u5173\u7684\u53ef\u4ee5\u914d\u7f6e\u7684 kubelet \u542f\u52a8\u53c2\u6570\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\n<p>MinimumGCAge\uff1acontainer \u7ed3\u675f\u591a\u957f\u65f6\u95f4\u4e4b\u540e\u624d\u80fd\u591f\u88ab\u56de\u6536\uff0c\u9ed8\u8ba4\u662f\u4e00\u5206\u949f<\/p>\n<\/li>\n<li>\n<p>MaxPerPodContainerCount\uff1a\u6bcf\u4e2a container \u6700\u7ec8\u53ef\u4ee5\u4fdd\u5b58\u591a\u5c11\u4e2a\u5df2\u7ecf\u7ed3\u675f\u7684\u5bb9\u5668\uff0c\u9ed8\u8ba4\u662f 1\uff0c\u8bbe\u7f6e\u4e3a\u8d1f\u6570\u8868\u793a\u4e0d\u505a\u9650\u5236<\/p>\n<\/li>\n<li>\n<p>MaxContainerCount\uff1a\u8282\u70b9\u4e0a\u6700\u591a\u80fd\u4fdd\u7559\u591a\u5c11\u4e2a\u7ed3\u675f\u7684\u5bb9\u5668\uff0c\u9ed8\u8ba4\u662f -1\uff0c\u8868\u793a\u4e0d\u505a\u9650\u5236<\/p>\n<\/li>\n<\/ul>\n<p>\u4e5f\u5c31\u662f\u8bf4\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0ckubelet \u4f1a\u81ea\u52a8\u6bcf\u5206\u949f\u53bb\u505a\u5bb9\u5668 GC\uff0c\u5bb9\u5668\u9000\u51fa\u4e00\u5206\u949f\u4e4b\u540e\u5c31\u53ef\u4ee5\u88ab\u5220\u9664\uff0c\u800c\u4e14\u6bcf\u4e2a\u5bb9\u5668\u505a\u591a\u53ea\u4f1a\u4fdd\u7559\u4e00\u4e2a\u5df2\u7ecf\u9000\u51fa\u7684\u5386\u53f2\u5bb9\u5668\u3002<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/kubelet-GC2.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/kubelet-GC2.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>gc\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\n<p>\u83b7\u53d6\u53ef\u4ee5\u6e05\u9664\u7684\u5bb9\u5668\uff0c\u8fd9\u4e9b\u5bb9\u5668\u90fd\u662f\u975e\u6d3b\u52a8\u7684\uff0c\u5e76\u4e14\u521b\u5efa\u65f6\u95f4\u6bd4 gcPolicy.MinAge \u8981\u65e9\uff1b<\/p>\n<\/li>\n<li>\n<p>\u901a\u8fc7\u5f3a\u5236\u6267\u884cgcPolicy.MaxPerPodContainer\uff0c\u4e3a\u6bcf\u4e2apod\u5220\u9664\u6700\u8001\u7684\u6b7b\u4ea1\u5bb9\u5668\uff1b<\/p>\n<\/li>\n<li>\n<p>\u901a\u8fc7\u5f3a\u5236\u6267\u884cgcPolicy.MaxContainers\u6765\u79fb\u9664\u6700\u8001\u7684\u6b7b\u4ea1\u5bb9\u5668\uff1b<\/p>\n<\/li>\n<li>\n<p>\u83b7\u53d6\u672a\u51c6\u5907\u597d\u4e14\u4e0d\u5305\u542b\u5bb9\u5668\u7684\u53ef\u6e05\u9664\u6c99\u7bb1\uff1b<\/p>\n<\/li>\n<li>\n<p>\u79fb\u9664\u53ef\u79fb\u9664\u7684\u6c99\u7bb1\uff1b<\/p>\n<\/li>\n<\/ol>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/kubelet-GC3.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/kubelet-GC3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><br \/>\n\u9996\u5148\u770b\u4e00\u4e0b evictContainers \u65b9\u6cd5<\/p>\n<ol>\n<li>\u9996\u5148\u6267\u884c evictableContainers \u6765\u83b7\u53d6\u9700\u8981\u88abgc\u7684\u5bb9\u5668\uff1b<\/li>\n<\/ol>\n<pre><code class=\"language-yaml\">\u4f7f\u7528runtime \u83b7\u53d6\u6240\u6709\u5bb9\u5668\n\ncontainers, err := cgc.manager.getKubeletContainers(true)\n\n\u5faa\u73af\u67e5\u770b\u83b7\u53d6\u5230\u7684\u6240\u6709\u5bb9\u5668\n\nfor _, container := range containers {\n\n        \u8fc7\u6ee4\u6389\u6240\u6709\u6b63\u5728\u8fd0\u884c\u7684\u5bb9\u5668\n\n        if container.State == runtimeapi.ContainerState_CONTAINER_RUNNING {\n\n            continue\n\n        }\n\n        \u8fc7\u6ee4\u6389\u65f6\u95f4\u4e0d\u5230\u7684\u5bb9\u5668\n\n        if newestGCTime.Before(time.Unix(0, container.CreatedAt)) {\n\n            continue\n\n         }\n\n        \u4fdd\u5b58\u7b26\u5408\u8981\u6c42\u7684\u8fc7\u671f\u5bb9\u5668\n\n        evictUnits[key] = append(evictUnits[key], containerInfo)\n\n}\n\n\u6839\u636e\u5bb9\u5668\u7684\u521b\u5efa\u65f6\u95f4\u8fdb\u884c\u6392\u5e8f\n\nfor uid := range evictUnits {\n\n        sort.Sort(byCreated(evictUnits[uid]))    \n\n}<\/code><\/pre>\n<ol start=\"2\">\n<li>\u5982\u679cpod\u5df2\u7ecf\u4e0d\u5b58\u5728\u4e86\uff0c\u90a3\u4e48\u5c31\u5220\u9664\u5176\u4e2d\u7684\u6240\u6709\u5bb9\u5668\u3002<\/li>\n<\/ol>\n<pre><code class=\"language-yaml\">if allSourcesReady {\n\n    for key, unit := range evictUnits {\n\n        if cgc.podStateProvider.IsPodDeleted(key.uid) || (cgc.podStateProvider.IsPodTerminated(key.uid) &amp;&amp; evictTerminatedPods) {\n\n            \u8c03\u7528runtime\uff0c\u5220\u9664n\u4e2a\u5bb9\u5668\n\n            cgc.removeOldestN(unit, len(unit))\n\n        }\n\n    }\n\n}\n<\/code><\/pre>\n<ol start=\"3\">\n<li>\n<p>\u6267\u884c GC \u7b56\u7565\uff0c\u4fdd\u8bc1\u6bcf\u4e2a POD \u6700\u591a\u53ea\u80fd\u4fdd\u5b58 MaxPerPodContainer \u4e2a\u5df2\u7ecf\u9000\u51fa\u7684\u5bb9\u5668<\/p>\n<p>\u9664\u4e86\u914d\u7f6e\u8fc7\u7684\u6700\u5927\u5bb9\u5668\u6570\u91cf\uff0c\u8c03\u7528 removeOldestN \u5220\u9664\u5269\u4f59\u7684\u6240\u6709\u5bb9\u5668<\/p>\n<p>cgc.enforceMaxContainersPerEvictUnit(evictUnits, gcPolicy.MaxPerPodContainer)<\/p>\n<\/li>\n<li>\n<p>\u6267\u884c GC \u7b56\u7565\uff0c\u4fdd\u8bc1\u8282\u70b9\u4e0a\u6700\u591a\u6709 MaxContainers \u4e2a\u5df2\u7ecf\u9000\u51fa\u7684\u5bb9\u5668 <\/p>\n<p>\u5148\u628a\u6700\u5927\u5bb9\u5668\u6570\u91cf\u5e73\u5206\u5230 pod\uff0c\u4fdd\u8bc1\u6bcf\u4e2a pod \u5728\u5e73\u5747\u6570\u91cf\u4ee5\u4e0b\uff1b<\/p>\n<p>numContainersPerEvictUnit := gcPolicy.MaxContainers \/ evictUnits.NumEvictUnits()<\/p>\n<p>cgc.enforceMaxContainersPerEvictUnit(evictUnits, numContainersPerEvictUnit)<\/p>\n<p>\u5982\u679c\u8fd8\u4e0d\u6ee1\u8db3\u8981\u6c42\u7684\u6570\u91cf\uff0c\u5c31\u6309\u7167\u65f6\u95f4\u987a\u5e8f\u5148\u5220\u9664\u6700\u65e7\u7684\u5bb9\u5668<\/p>\n<p>sort.Sort(byCreated(flattened))<\/p>\n<p>cgc.removeOldestN(flattened, numContainers-gcPolicy.MaxContainers)<\/p>\n<\/li>\n<\/ol>\n<p>\u63a5\u4e0b\u6765\u770b\u4e00\u4e0b evictSandboxes \u65b9\u6cd5\uff0c \u8fd9\u4e2a\u65b9\u6cd5\u79fb\u9664\u6240\u6709\u53ef\u79fb\u9664\u7684\u6c99\u7bb1\u3002 \u4e00\u4e2a\u53ef\u79fb\u52a8\u7684\u6c99\u7bb1\u5fc5\u987b\u7b26\u5408\u4ee5\u4e0b\u8981\u6c42\uff1a1.\u672a\u5904\u4e8e\u5c31\u7eea\u72b6\u6001\uff1b2.\u4e0d\u5305\u542b\u5bb9\u5668\uff1b3.\u5c5e\u4e8e\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\uff08\u5373\u5df2\u7ecf\u79fb\u9664\u7684\uff09pod\uff0c\u6216\u8005\u4e0d\u662f\u8be5pod\u7684\u6700\u65b0\u521b\u5efa\u7684\u6c99\u7bb1\uff1b<\/p>\n<pre><code class=\"language-yaml\">\u83b7\u53d6\u6240\u6709\u7684\u6c99\u7bb1\u5bb9\u5668\n\ncontainers, err := cgc.manager.getKubeletContainers(true)\n\nfor _, container := range containers {\n\n        sandboxIDs.Insert(container.PodSandboxId)    \n\n}\n\nsandboxes, err := cgc.manager.getKubeletSandboxes(true)\n\n\u6839\u636e\u6c99\u7bb1\u72b6\u6001\uff0c\u8fc7\u6ee4\u6389\u5b58\u6d3b\uff0c\u6216\u8005\u6709\u5bb9\u5668\u5b58\u5728\u7684\u6c99\u7bb1\n\nsandbox.State == runtimeapi.PodSandboxState_SANDBOX_READY\n\nsandboxIDs.Has(sandbox.Id)\n\n\u6839\u636e\u6c99\u7bb1\u521b\u5efa\u65f6\u523b\u6392\u5e8f\n\nsort.Sort(sandboxByCreated(sandboxesByPod[uid]))\n\n\u5982\u679cpod\u6b7b\u6389\u4e86\uff0c\u90a3\u4e48\u5220\u9664\u6240\u6709\u7684\u6c99\u7bb1\n\nif cgc.podStateProvider.IsPodDeleted(podUID) || (cgc.podStateProvider.IsPodTerminated(podUID) &amp;&amp; evictTerminatedPods) {\n\n    cgc.removeOldestNSandboxes(sandboxes, len(sandboxes))\n\n}\n\n\u5426\u5219\uff0c\u7559\u4e00\u4e2a\u6c99\u7bb1\uff0c\u5269\u4e0b\u7684\u90fd\u53ef\u4ee5\u5220\u9664\n\ncgc.removeOldestNSandboxes(sandboxes, len(sandboxes)-1)<\/code><\/pre>\n<p>\u6700\u540e\u5219\u56de\u6536\/var\/log\/containers\u4e0b\u5df2\u7ecf\u88ab\u5220\u9664\u7684\u5bb9\u5668\u7684\u65e5\u5fd7\u6587\u4ef6\u3002<\/p>\n<p><strong>2. \u955c\u50cfGC<\/strong><\/p>\n<p>\u955c\u50cf\u4e3b\u8981\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\uff0c\u867d\u7136 docker \u4f7f\u7528\u955c\u50cf\u5206\u5c42\u53ef\u4ee5\u8ba9\u591a\u4e2a\u955c\u50cf\u5171\u4eab\u5b58\u50a8\uff0c\u4f46\u662f\u957f\u65f6\u95f4\u8fd0\u884c\u7684\u8282\u70b9\u5982\u679c\u4e0b\u8f7d\u4e86\u5f88\u591a\u955c\u50cf\u4e5f\u4f1a\u5bfc\u81f4\u5360\u7528\u7684\u5b58\u50a8\u7a7a\u95f4\u8fc7\u591a\u3002\u5982\u679c\u955c\u50cf\u5bfc\u81f4\u78c1\u76d8\u88ab\u5360\u6ee1\uff0c\u4f1a\u9020\u6210\u5e94\u7528\u65e0\u6cd5\u6b63\u5e38\u5de5\u4f5c\u3002docker \u9ed8\u8ba4\u4e5f\u4e0d\u4f1a\u505a\u955c\u50cf\u6e05\u7406\uff0c\u955c\u50cf\u4e00\u65e6\u4e0b\u8f7d\u5c31\u4f1a\u6c38\u8fdc\u7559\u5728\u672c\u5730\uff0c\u9664\u975e\u88ab\u624b\u52a8\u5220\u9664\u3002<\/p>\n<p>\u5176\u5b9e\u5f88\u591a\u955c\u50cf\u5e76\u6ca1\u6709\u88ab\u5b9e\u9645\u4f7f\u7528\uff0c\u8fd9\u4e9b\u4e0d\u7528\u7684\u955c\u50cf\u7ee7\u7eed\u5360\u7528\u7a7a\u95f4\u662f\u975e\u5e38\u5927\u7684\u6d6a\u8d39\uff0c\u4e5f\u662f\u5de8\u5927\u7684\u9690\u60a3\uff0c\u56e0\u6b64 kubelet \u4e5f\u4f1a\u5468\u671f\u6027\u5730\u53bb\u6e05\u7406\u955c\u50cf\u3002<\/p>\n<p>\u955c\u50cf\u7684\u6e05\u7406\u548c\u5bb9\u5668\u4e0d\u540c\uff0c\u662f\u4ee5\u5360\u7528\u7684\u7a7a\u95f4\u4f5c\u4e3a\u6807\u51c6\u7684\uff0c\u7528\u6237\u53ef\u4ee5\u914d\u7f6e\u5f53\u955c\u50cf\u5360\u636e\u591a\u5927\u6bd4\u4f8b\u7684\u5b58\u50a8\u7a7a\u95f4\u65f6\u624d\u8fdb\u884c\u6e05\u7406\u3002\u6e05\u7406\u7684\u65f6\u5019\u4f1a\u4f18\u5148\u6e05\u7406\u6700\u4e45\u6ca1\u6709\u88ab\u4f7f\u7528\u7684\u955c\u50cf\uff0c\u955c\u50cf\u88ab pull \u4e0b\u6765\u6216\u8005\u88ab\u5bb9\u5668\u4f7f\u7528\u90fd\u4f1a\u66f4\u65b0\u5b83\u7684\u6700\u8fd1\u4f7f\u7528\u65f6\u95f4\u3002<\/p>\n<p>\u542f\u52a8 kubelet \u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u914d\u7f6e\u8fd9\u4e9b\u53c2\u6570\u63a7\u5236\u955c\u50cf\u6e05\u7406\u7684\u7b56\u7565\uff1a<\/p>\n<ul>\n<li>\n<p>ImageMinimumGCAge.Duration\uff1a\u955c\u50cf\u6700\u5c11\u8fd9\u4e48\u4e45\u6ca1\u6709\u88ab\u4f7f\u7528\u624d\u4f1a\u88ab\u6e05\u7406<\/p>\n<\/li>\n<li>\n<p>ImageGCHighThresholdPercent\uff1a\u78c1\u76d8\u4f7f\u7528\u7387\u7684\u4e0a\u9650\uff0c\u5f53\u8fbe\u5230\u8fd9\u4e00\u4f7f\u7528\u7387\u7684\u65f6\u5019\u4f1a\u89e6\u53d1\u955c\u50cf\u6e05\u7406\u3002\u9ed8\u8ba4\u503c\u4e3a 90%<\/p>\n<\/li>\n<li>\n<p>ImageGCLowThresholdPercent\uff1a\u78c1\u76d8\u4f7f\u7528\u7387\u7684\u4e0b\u9650\uff0c\u6bcf\u6b21\u6e05\u7406\u76f4\u5230\u4f7f\u7528\u7387\u4f4e\u4e8e\u8fd9\u4e2a\u503c\u6216\u8005\u6ca1\u6709\u53ef\u4ee5\u6e05\u7406\u7684\u955c\u50cf\u4e86\u624d\u4f1a\u505c\u6b62.\u9ed8\u8ba4\u503c\u4e3a 80%<\/p>\n<\/li>\n<\/ul>\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5f53\u955c\u50cf\u5360\u6ee1\u6240\u5728\u76d8 90% \u5bb9\u91cf\u7684\u65f6\u5019\uff0ckubelet \u5c31\u4f1a\u8fdb\u884c\u6e05\u7406\uff0c\u4e00\u76f4\u5230\u955c\u50cf\u5360\u7528\u7387\u4f4e\u4e8e 80% \u4e3a\u6b62\u3002<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/kubelet-GC4.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/kubelet-GC4.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u6211\u4eec\u6765\u770b\u4e00\u4e0b GarbageCollect \u65b9\u6cd5<\/p>\n<pre><code>\u4ece cadvisor \u4e2d\u83b7\u53d6\u955c\u50cf\u6240\u5728\u6587\u4ef6\u7cfb\u7edf\u7684\u4fe1\u606f\uff0c\u5305\u62ec\u78c1\u76d8\u7684\u5bb9\u91cf\u548c\u5f53\u524d\u7684\u4f7f\u7528\u91cf\n\nfsStats, err := im.statsProvider.ImageFsStats()\n\n\u5982\u679c\u955c\u50cf\u7684\u78c1\u76d8\u4f7f\u7528\u7387\u8fbe\u5230\u4e86\u8bbe\u5b9a\u7684\u6700\u9ad8\u9608\u503c\uff0c\u5c31\u8fdb\u884c\u6e05\u7406\u5de5\u4f5c\uff0c\u76f4\u5230\u4f7f\u7528\u7387\n\nusagePercent := 100 - int(available*100\/capacity)\n\nif usagePercent >= im.policy.HighThresholdPercent {\n\n        im.freeSpace(amountToFree, time.Now())\n\n}<\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\u770b\u4e00\u4e0b freeSpace <\/p>\n<pre><code>\u901a\u8fc7 runtime \u66f4\u65b0\u955c\u50cf\u8bb0\u5f55\u5217\u8868\u4e2d\u7684\u6570\u636e\uff0c\u6dfb\u52a0\u521a\u53d1\u73b0\u7684\u955c\u50cf\uff0c\u79fb\u9664\u5df2\u7ecf\u4e0d\u5b58\u5728\u7684\u955c\u50cf\n\nim.detectImages(freeTime)\n\n\u6839\u636e\u955c\u50cf\u7684\u6700\u8fd1\u4f7f\u7528\u65f6\u95f4\u548c\u6700\u8fd1\u53d1\u73b0\u65f6\u95f4\u8fdb\u884c\u6392\u5e8f\n\nsort.Sort(byLastUsedAndDetected(images))\n\n\u904d\u5386\u6240\u6709\u955c\u50cf\uff0c\u5220\u9664\u5230\u6709\u6240\u9700\u7684\u7a7a\u95f4\n\nfor _, image := range images {\n\n        \u7565\u8fc7\u6700\u8fd1\u4f7f\u7528\u65f6\u95f4\u8ddd\u79bb\u73b0\u5728\u5c0f\u4e8e\u8bbe\u7f6e\u7684 MinAge \u7684\u955c\u50cf\n\n        if freeTime.Sub(image.firstDetected) < im.policy.MinAge {\n\n                continue\n\n        }\n\n        \u5220\u9664\u955c\u50cf\u5e76\u66f4\u65b0 imageRecords \u5bf9\u8c61\u4e2d\u7f13\u5b58\u7684\u955c\u50cf\u4fe1\u606f\uff0c\u8bb0\u5f55\u5220\u9664\u7684\u955c\u50cf\u5927\u5c0f\n\n        im.runtime.RemoveImage(container.ImageSpec{Image: image.id})\n\n        delete(im.imageRecords, image.id)\n\n        spaceFreed += image.size\n\n        \u5982\u679c\u5220\u9664\u7684\u955c\u50cf\u5927\u5c0f\u6ee1\u8db3\u9700\u6c42\uff0c\u505c\u6b62\u7ee7\u7eed\u5220\u9664\n\n        if spaceFreed >= bytesToFree {\n\n                break        \n\n        }\n\n}<\/code><\/pre>\n<p>realImageGCManager \u7f13\u5b58\u4e86\u5f53\u524d\u8282\u70b9\u4f7f\u7528\u7684\u955c\u50cf\u4fe1\u606f\uff0c\u5e76\u5728 Start() \u65b9\u6cd5\u4e2d\u542f\u52a8\u4e24\u4e2a goroutine \u5468\u671f\u6027\u5730\u53bb\u66f4\u65b0\u7f13\u5b58\u7684\u5185\u5bb9\u3002GarbageCollect \u7684\u903b\u8f91\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n<p>\u8c03\u7528 cAdvisor \u63a5\u53e3\u83b7\u53d6\u955c\u50cf\u6240\u5728\u78c1\u76d8\u7684\u6587\u4ef6\u7cfb\u7edf\u4fe1\u606f\uff0c\u6839\u636e\u5f53\u524d\u7684\u4f7f\u7528\u91cf\u548c\u914d\u7f6e\u7684 GC \u7b56\u7565\u786e\u5b9a\u662f\u5426\u9700\u8981\u8fdb\u884c\u6e05\u7406\uff1b<\/p>\n<p>\u5982\u679c\u9700\u8981\u6e05\u7406\uff0c\u8ba1\u7b97\u9700\u8981\u6e05\u7406\u7684\u603b\u5927\u5c0f\uff0c\u8c03\u7528 freeSpace \u8fdb\u884c\u955c\u50cf\u6e05\u7406\u5de5\u4f5c\uff1b<\/p>\n<p>\u628a\u6240\u6709\u53ef\u4ee5\u6e05\u7406\u7684\u955c\u50cf\u6839\u636e\u4f7f\u7528\u65f6\u95f4\u8fdb\u884c\u6392\u5e8f\uff0c\u8fdb\u884c\u9010\u4e2a\u6e05\u7406\uff0c\u76f4\u5230\u6e05\u7406\u7684\u955c\u50cf\u603b\u5927\u5c0f\u6ee1\u8db3\u9700\u6c42\u624d\u505c\u6b62\uff1b<\/p>\n<p>\u6ce8\u610f\u70b9\uff1a<\/p>\n<ol>\n<li>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0ccontainer GC \u662f\u6bcf\u5206\u949f\u8fdb\u884c\u4e00\u6b21\uff0cimage GC \u662f\u6bcf\u4e94\u5206\u949f\u4e00\u6b21\uff0c\u5982\u679c\u6709\u4e0d\u540c\u7684\u9700\u8981\uff0c\u53ef\u4ee5\u901a\u8fc7 kubelet \u7684\u542f\u52a8\u53c2\u6570\u8fdb\u884c\u4fee\u6539<\/p>\n<\/li>\n<li>\n<p>\u4e0d\u8981\u624b\u52a8\u6e05\u7406\u955c\u50cf\u548c\u5bb9\u5668\uff0c\u56e0\u4e3a kubelet \u8fd0\u884c\u7684\u65f6\u5019\u4f1a\u4fdd\u5b58\u5f53\u524d\u8282\u70b9\u4e0a\u955c\u50cf\u548c\u5bb9\u5668\u7684\u7f13\u5b58\uff0c\u5e76\u5b9a\u65f6\u66f4\u65b0\u3002\u624b\u52a8\u6e05\u7406\u955c\u50cf\u548c\u5bb9\u5668\u4f1a\u8ba9 kubelet \u505a\u51fa\u8bef\u5224\uff0c\u5e26\u6765\u4e0d\u786e\u5b9a\u7684\u95ee\u9898<\/p>\n<\/li>\n<\/ol>\n<p>\u539f\u6587\uff1a<a href=\"https:\/\/www.jianshu.com\/p\/c3937c315164\">https:\/\/www.jianshu.com\/p\/c3937c315164<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u8fd0\u884c\u4e00\u6bb5\u65f6\u5019\u4e4b\u540e\uff0c\u8282\u70b9\u4e0a\u4f1a\u4e0b\u8f7d\u5f88\u591a\u955c\u50cf\uff0c\u4e5f\u4f1a\u6709\u5f88\u591a\u56e0\u4e3a\u5404\u79cd\u539f\u56e0\u9000\u51fa\u7684\u5bb9\u5668\u3002\u4e3a\u4e86\u4fdd\u8bc1\u8282\u70b9\u80fd\u591f\u6b63\u5e38\u8fd0\u884c\uff0ckube [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":6635,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[417,412],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/6590"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6590"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/6590\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/6635"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}