{"id":95161,"date":"2026-08-16T11:56:54","date_gmt":"2026-08-16T03:56:54","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/95161.html"},"modified":"2026-08-16T11:56:54","modified_gmt":"2026-08-16T03:56:54","slug":"%e3%80%90docker%e8%bf%9b%e9%98%b6%e3%80%91-2-%e5%ae%b9%e5%99%a8%e9%95%9c%e5%83%8f%e7%9a%84%e5%88%86%e5%b1%82","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/95161.html","title":{"rendered":"\u3010DOCKER\u8fdb\u9636\u3011-2 \u5bb9\u5668\u955c\u50cf\u7684\u5206\u5c42"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u5bb9\u5668\u955c\u50cf\u4e0e Overlay2 \u5b58\u50a8<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001\u5bb9\u5668\u955c\u50cf\u6982\u8ff0<\/li>\n<li>\n<ul>\n<li>1. Docker \u955c\u50cf<\/li>\n<li>2. \u8054\u5408\u6587\u4ef6\u7cfb\u7edf&#xff08;UnionFS&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001Docker Overlay2 \u5b58\u50a8\u9a71\u52a8<\/li>\n<li>\n<ul>\n<li>1. \u5b58\u50a8\u9a71\u52a8\u8bf4\u660e<\/li>\n<li>2. \u6838\u5fc3\u6982\u5ff5<\/li>\n<li>3. Overlay2 \u5206\u5c42\u7ed3\u6784<\/li>\n<li>4. \u5143\u6570\u636e&#xff08;Metadata&#xff09;<\/li>\n<li>5. \u4e3a\u4ec0\u4e48\u4e0b\u8f7d\u6162\u3001\u5220\u9664\u5feb&#xff1f;<\/li>\n<li>6. OverlayFS \u4e0e overlay2 \u7684\u533a\u522b<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u955c\u50cf\u5c42\u6587\u4ef6\u67e5\u627e\u4e0e chainID \u8ba1\u7b97<\/li>\n<li>\n<ul>\n<li>1. \u67e5\u627e\u955c\u50cf\u6307\u5b9a\u5c42\u6587\u4ef6\u5185\u5bb9&#xff08;\u601d\u8def&#xff09;<\/li>\n<li>2. \u5b8c\u6574\u64cd\u4f5c\u6d41\u7a0b<\/li>\n<li>\n<ul>\n<li>\u6b65\u9aa4 1&#xff1a;\u83b7\u53d6\u955c\u50cf\u77ed ID<\/li>\n<li>\u6b65\u9aa4 2&#xff1a;\u901a\u8fc7\u77ed ID \u83b7\u53d6\u955c\u50cf\u957f ID<\/li>\n<li>\u6b65\u9aa4 3&#xff1a;\u6839\u636e\u955c\u50cf\u957f ID \u83b7\u53d6\u955c\u50cf\u5206\u5c42 ID<\/li>\n<li>\u6b65\u9aa4 4&#xff1a;\u901a\u8fc7\u5206\u5c42 ID \u83b7\u53d6\u5206\u5c42\u7f13\u5b58 ID<\/li>\n<li>\u6b65\u9aa4 5&#xff1a;\u67e5\u770b\u8be5\u5206\u5c42\u5b9e\u9645\u6587\u4ef6\u5b58\u50a8\u76ee\u5f55<\/li>\n<\/ul>\n<\/li>\n<li>3. \u955c\u50cf\u5e95\u5c42\u4e0e\u4e2d\u95f4\u5c42\u67e5\u627e\u89c4\u5219<\/li>\n<li>4. \u4e2d\u95f4\u5c42 chainID \u8ba1\u7b97\u793a\u4f8b<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u5bb9\u5668\u4e0e\u955c\u50cf\u7684\u5173\u7cfb&#xff08;Nginx Overlay \u6f14\u793a&#xff09;<\/li>\n<li>\n<ul>\n<li>1. \u542f\u52a8 Nginx \u5bb9\u5668<\/li>\n<li>2. \u67e5\u770b\u5bb9\u5668 overlay \u6302\u8f7d\u4fe1\u606f<\/li>\n<li>3. Overlay \u8054\u5408\u6587\u4ef6\u7cfb\u7edf\u56db\u5c42\u7ed3\u6784<\/li>\n<li>4. \u67e5\u770b\u53ea\u8bfb\u5c42\u77ed ID<\/li>\n<li>5. \u5bb9\u5668\u5185\u5199\u6587\u4ef6\u6d4b\u8bd5<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>\u5bb9\u5668\u955c\u50cf\u4e0e Overlay2 \u5b58\u50a8<\/h2>\n<h3>\u4e00\u3001\u5bb9\u5668\u955c\u50cf\u6982\u8ff0<\/h3>\n<h4>1. Docker \u955c\u50cf<\/h4>\n<ul>\n<li>Docker \u955c\u50cf\u662f\u53ea\u8bfb\u7684\u5bb9\u5668\u6a21\u677f&#xff0c;\u662f\u5bb9\u5668\u8fd0\u884c\u7684\u57fa\u7840\u3002<\/li>\n<li>\u4e3a\u5bb9\u5668\u63d0\u4f9b\u9759\u6001\u6587\u4ef6\u7cfb\u7edf\u8fd0\u884c\u73af\u5883&#xff08;rootfs&#xff09;\u3002<\/li>\n<li>\u955c\u50cf &#061; \u5bb9\u5668\u7684\u300c\u9759\u6b62\u72b6\u6001\u300d&#xff1b;\u5bb9\u5668 &#061; \u955c\u50cf\u7684\u300c\u8fd0\u884c\u72b6\u6001\u300d\u3002<\/li>\n<\/ul>\n<h4>2. \u8054\u5408\u6587\u4ef6\u7cfb\u7edf&#xff08;UnionFS&#xff09;<\/h4>\n<ul>\n<li>\u8054\u5408\u6587\u4ef6\u7cfb\u7edf\u662f\u5b9e\u73b0\u300c\u8054\u5408\u6302\u8f7d\u300d\u6280\u672f\u7684\u6587\u4ef6\u7cfb\u7edf\u3002<\/li>\n<li>\u8054\u5408\u6302\u8f7d\u53ef\u4ee5\u5728\u4e00\u4e2a\u6302\u8f7d\u70b9\u540c\u65f6\u6302\u8f7d\u591a\u4e2a\u6587\u4ef6\u7cfb\u7edf&#xff0c;\u5c06\u6302\u8f7d\u70b9\u539f\u76ee\u5f55\u4e0e\u88ab\u6302\u8f7d\u5185\u5bb9\u6574\u5408&#xff0c;\u6700\u7ec8\u5448\u73b0\u6574\u5408\u540e\u7684\u5404\u5c42\u6587\u4ef6\u548c\u76ee\u5f55\u3002<\/li>\n<li>Docker \u955c\u50cf\u57fa\u4e8e\u8be5\u6280\u672f\u5b9e\u73b0\u5206\u5c42\u4e0b\u8f7d\u4e0e\u5206\u5c42\u5b58\u50a8\u3002<\/li>\n<\/ul>\n<h3>\u4e8c\u3001Docker Overlay2 \u5b58\u50a8\u9a71\u52a8<\/h3>\n<h4>1. \u5b58\u50a8\u9a71\u52a8\u8bf4\u660e<\/h4>\n<p>\u5bb9\u5668\u6587\u4ef6\u7cfb\u7edf\u6709\u591a\u79cd\u5b58\u50a8\u9a71\u52a8\u5b9e\u73b0&#xff1a;aufs&#xff08;\u8054\u5408\u6587\u4ef6\u7cfb\u7edf&#xff09;\u3001devicemapper&#xff08;\u8bbe\u5907\u6620\u5c04&#xff09;\u3001overlay\u3001overlay2 \u7b49\u3002\u672c\u6587\u4ee5 overlay2 \u4e3a\u4f8b\u8bf4\u660e\u3002<\/p>\n<h4>2. \u6838\u5fc3\u6982\u5ff5<\/h4>\n<li>registry \/ repository&#xff1a;registry \u662f repository \u7684\u96c6\u5408&#xff0c;repository \u662f\u955c\u50cf\u7684\u96c6\u5408\u3002<\/li>\n<li>image&#xff1a;\u5b58\u50a8\u955c\u50cf\u5143\u6570\u636e&#xff08;\u955c\u50cf\u67b6\u6784\u3001\u9ed8\u8ba4\u914d\u7f6e\u3001\u5bb9\u5668\u914d\u7f6e\u7b49&#xff09;&#xff0c;\u5c5e\u4e8e\u903b\u8f91\u6982\u5ff5&#xff0c;\u4e0d\u5b58\u5728\u5bf9\u5e94\u7684\u7269\u7406\u955c\u50cf\u6587\u4ef6\u3002<\/li>\n<li>layer&#xff08;\u955c\u50cf\u5c42&#xff09;&#xff1a;\u6784\u6210\u955c\u50cf&#xff0c;\u5355\u4e2a layer \u53ef\u88ab\u591a\u4e2a\u955c\u50cf\u5171\u4eab\u3002<\/li>\n<h4>3. Overlay2 \u5206\u5c42\u7ed3\u6784<\/h4>\n<ul>\n<li>lowerdir&#xff1a;\u53ea\u8bfb\u955c\u50cf\u5c42&#xff0c;\u5b58\u653e\u57fa\u7840\u955c\u50cf\u6587\u4ef6&#xff08;\u793a\u4f8b file1\u3001file2\u3001file3&#xff09;\u3002<\/li>\n<li>upperdir&#xff1a;\u5bb9\u5668\u8bfb\u5199\u5c42&#xff0c;\u4fdd\u5b58\u5bb9\u5668\u8fd0\u884c\u65f6\u7684\u4fee\u6539\u3001\u65b0\u589e\u6587\u4ef6&#xff08;\u793a\u4f8b\u4e2d\u8986\u76d6 file2\u3001\u65b0\u589e file4&#xff09;\u3002<\/li>\n<li>merged&#xff1a;\u8054\u5408\u6302\u8f7d\u540e\u7684\u7edf\u4e00\u89c6\u56fe&#xff0c;\u5bb9\u5668\u5185\u53ef\u89c1\u6574\u5408\u540e\u7684\u5b8c\u6574\u6587\u4ef6&#xff08;file1~file4&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u539f\u7406&#xff1a;\u5e95\u5c42\u53ea\u8bfb\u955c\u50cf\u5c42 &#043; \u4e0a\u5c42\u53ef\u5199\u5bb9\u5668\u5c42&#xff0c;\u5408\u5e76\u5bf9\u5916\u63d0\u4f9b\u5b8c\u6574\u6587\u4ef6\u7cfb\u7edf\u3002<\/p>\n<h4>4. \u5143\u6570\u636e&#xff08;Metadata&#xff09;<\/h4>\n<p>\u5143\u6570\u636e\u5373\u6587\u4ef6\u7684\u5c5e\u6027\u4fe1\u606f&#xff0c;\u5305\u62ec&#xff1a;<\/p>\n<ul>\n<li>\u540d\u79f0&#xff08;\u5982 abc&#xff09;<\/li>\n<li>\u6587\u4ef6\u5927\u5c0f<\/li>\n<li>\u6587\u4ef6\u6743\u9650<\/li>\n<li>\u521b\u5efa\u65f6\u95f4<\/li>\n<li>\u6587\u4ef6\u7c7b\u578b<\/li>\n<li>\u6587\u4ef6\u6240\u6709\u8005<\/li>\n<\/ul>\n<h4>5. \u4e3a\u4ec0\u4e48\u4e0b\u8f7d\u6162\u3001\u5220\u9664\u5feb&#xff1f;<\/h4>\n<ul>\n<li>\u4e0b\u8f7d\u6162&#xff1a;\u9700\u8981\u5b8c\u6574\u62c9\u53d6\u955c\u50cf\u5404\u5c42\u6570\u636e&#xff0c;\u6570\u636e\u91cf\u5927\u3002<\/li>\n<li>\u5220\u9664\u5feb&#xff1a;\u5220\u9664\u7684\u53ea\u662f\u6570\u636e\u7684\u5143\u6570\u636e&#xff08;\u7d22\u5f15&#xff09;&#xff0c;\u53ea\u8981\u672a\u88ab\u8986\u76d6\u5199\u5165&#xff0c;\u6570\u636e\u5c31\u4e0d\u6613\u771f\u6b63\u4e22\u5931&#xff0c;\u56e0\u6b64\u5220\u9664\u5f88\u5feb\u3002<\/li>\n<\/ul>\n<h4>6. OverlayFS \u4e0e overlay2 \u7684\u533a\u522b<\/h4>\n<p>root&#064;harbor:~# docker info | grep overlay<br \/>\n Storage Driver: overlayfs<br \/>\n  Network: bridge host ipvlan macvlan null overlay<\/p>\n<p>\u601d\u8003&#xff1a;\u4e3a\u4ec0\u4e48\u663e\u793a\u7684\u4e0d\u662f overlay2&#xff1f;overlayfs \u548c overlay2 \u6709\u4ec0\u4e48\u533a\u522b&#xff1f;<\/p>\n<p>\u7b80\u5355\u6765\u8bf4&#xff1a;<\/p>\n<ul>\n<li>OverlayFS&#xff1a;Linux \u5185\u6838\u4e2d\u7684\u4e00\u4e2a\u6587\u4ef6\u7cfb\u7edf&#xff0c;\u63d0\u4f9b\u8054\u5408\u6302\u8f7d&#xff08;union mount&#xff09;\u529f\u80fd\u3002<\/li>\n<li>overlay2&#xff1a;Docker \u57fa\u4e8e OverlayFS \u5b9e\u73b0\u7684\u4e00\u4e2a\u5b58\u50a8\u9a71\u52a8&#xff08;storage driver&#xff09;\u3002<\/li>\n<\/ul>\n<p>docker info \u4e2d Storage Driver: overlayfs \u8868\u793a Docker \u6b63\u5728\u4f7f\u7528\u57fa\u4e8e OverlayFS \u7684\u5b58\u50a8\u9a71\u52a8&#xff0c;\u5b9e\u9645\u4e0a\u5c31\u662f overlay2\u3002<\/p>\n<p>\u6838\u5fc3\u533a\u522b&#xff1a;overlay&#xff08;\u65e7\u7248&#xff09;vs overlay2&#xff08;\u65b0\u7248&#xff09;<\/p>\n<table>\n<tr>\u5bf9\u6bd4\u7ef4\u5ea6overlay&#xff08;\u65e7\u7248&#xff09;overlay2&#xff08;\u65b0\u7248&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u955c\u50cf\u5c42\u652f\u6301<\/td>\n<td>\u4ec5\u652f\u6301\u5355\u5c42 lowerdir&#xff0c;\u591a\u5c42\u65f6\u9760\u76ee\u5f55 &#043; \u786c\u94fe\u63a5\u6a21\u62df&#xff0c;\u6548\u7387\u4f4e<\/td>\n<td>\u539f\u751f\u652f\u6301\u591a\u5c42 lowerdir&#xff0c;\u6700\u591a 128 \u5c42<\/td>\n<\/tr>\n<tr>\n<td>Inode \u5229\u7528<\/td>\n<td>\u6548\u7387\u4f4e&#xff0c;\u5bb9\u5668\/\u955c\u50cf\u591a\u65f6\u6613\u8017\u5c3d inode<\/td>\n<td>\u6548\u7387\u9ad8&#xff0c;\u663e\u8457\u51cf\u5c11 inode \u538b\u529b<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u6838\u8981\u6c42<\/td>\n<td>3.18&#043;<\/td>\n<td>4.0&#043;&#xff08;RHEL\/CentOS 7 \u9700 3.10.0-514&#043;&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u7a33\u5b9a\u6027\u4e0e\u6027\u80fd<\/td>\n<td>\u65e9\u671f\u5b9e\u73b0&#xff0c;\u76f8\u5bf9\u6709\u9650<\/td>\n<td>\u66f4\u597d&#xff0c;\u5c24\u5176\u591a\u5c42\u955c\u50cf\u4e0e\u9891\u7e41\u5199\u64cd\u4f5c<\/td>\n<\/tr>\n<tr>\n<td>\u5b98\u65b9\u63a8\u8350<\/td>\n<td>\u4e0d\u63a8\u8350\u7528\u4e8e\u751f\u4ea7<\/td>\n<td>\u9996\u9009\u3001\u9ed8\u8ba4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e3a\u4ec0\u4e48\u65b0\u7248\u663e\u793a overlayfs&#xff1f;<\/p>\n<p>\u8f83\u65b0\u7248\u672c Docker&#xff08;\u5c24\u5176\u662f\u4f7f\u7528\u8f83\u65b0 containerd \u7684\u7248\u672c&#xff09;\u672f\u8bed\u53d1\u751f\u4e86\u53d8\u5316&#xff1a;\u5b98\u65b9\u5c06 Linux \u5185\u6838\u9a71\u52a8\u79f0\u4e3a OverlayFS&#xff0c;\u5c06 Docker \u5b58\u50a8\u9a71\u52a8\u79f0\u4e3a overlay2\u3002\u4ece Docker Engine 29.0 \u8d77&#xff0c;overlay2 \u88ab\u89c6\u4e3a\u300c\u7ecf\u5178&#xff08;legacy&#xff09;\u300d\u9a71\u52a8&#xff0c;\u88ab\u65b0\u7684 overlayfs containerd snapshotter \u53d6\u4ee3&#xff0c;\u56e0\u6b64\u65b0\u7cfb\u7edf\u663e\u793a Storage Driver: overlayfs \u662f\u6b63\u5e38\u4e14\u7b26\u5408\u9884\u671f\u7684\u3002<\/p>\n<p>\u5c0f\u7ed3&#xff1a;<\/p>\n<li>\u6982\u5ff5\u533a\u5206&#xff1a;OverlayFS \u662f\u5185\u6838\u529f\u80fd&#xff0c;overlay \/ overlay2 \u662f Docker \u5b58\u50a8\u9a71\u52a8\u3002<\/li>\n<li>\u5386\u53f2\u6f14\u8fdb&#xff1a;overlay2 \u662f\u4e3a\u89e3\u51b3\u65e7\u7248 overlay \u5728\u591a\u955c\u50cf\u5c42\u4e0e inode \u4f7f\u7528\u4e0a\u7684\u7f3a\u9677\u800c\u8bbe\u8ba1\u3002<\/li>\n<li>\u5f53\u524d\u72b6\u6001&#xff1a;\u663e\u793a overlayfs \u5373\u4f7f\u7528\u4e86\u6700\u65b0\u57fa\u4e8e OverlayFS \u7684\u5b58\u50a8\u5b9e\u73b0&#xff0c;\u662f\u5b98\u65b9\u63a8\u8350\u65b9\u5f0f&#xff0c;\u65e0\u9700\u989d\u5916\u64cd\u4f5c\u3002<\/li>\n<h3>\u4e09\u3001\u955c\u50cf\u5c42\u6587\u4ef6\u67e5\u627e\u4e0e chainID \u8ba1\u7b97<\/h3>\n<h4>1. \u67e5\u627e\u955c\u50cf\u6307\u5b9a\u5c42\u6587\u4ef6\u5185\u5bb9&#xff08;\u601d\u8def&#xff09;<\/h4>\n<li>\u83b7\u53d6\u955c\u50cf\u77ed ID \u2014\u2014 docker images<\/li>\n<li>\u901a\u8fc7\u77ed ID \u83b7\u53d6\u957f ID \u2014\u2014 \u5728 overlay \u76ee\u5f55\u4e0b\u7684 repositories.json \u4e2d\u67e5\u627e<\/li>\n<li>\u83b7\u53d6\u955c\u50cf\u5206\u5c42 ID \u2014\u2014 &#8230;\/sha256\/<\/li>\n<li>\u83b7\u53d6\u5206\u5c42\u7f13\u5b58 ID \u2014\u2014 cache-id<\/li>\n<li>\u6839\u636e\u7f13\u5b58 ID \u5b9a\u4f4d\u5206\u5c42\u6587\u4ef6\u5185\u5bb9<\/li>\n<h4>2. \u5b8c\u6574\u64cd\u4f5c\u6d41\u7a0b<\/h4>\n<h5>\u6b65\u9aa4 1&#xff1a;\u83b7\u53d6\u955c\u50cf\u77ed ID<\/h5>\n<p>docker images<\/p>\n<h5>\u6b65\u9aa4 2&#xff1a;\u901a\u8fc7\u77ed ID \u83b7\u53d6\u955c\u50cf\u957f ID<\/h5>\n<p>\u8def\u5f84&#xff1a;\/var\/lib\/docker\/image\/overlay2\/<\/p>\n<p>cat repositories.json | grep \u77edID<\/p>\n<h5>\u6b65\u9aa4 3&#xff1a;\u6839\u636e\u955c\u50cf\u957f ID \u83b7\u53d6\u955c\u50cf\u5206\u5c42 ID<\/h5>\n<p>\u8def\u5f84&#xff1a;\/var\/lib\/docker\/image\/overlay2\/imagedb\/content\/sha256\/\u957fID<\/p>\n<p>cat \/var\/lib\/docker\/image\/overlay2\/imagedb\/content\/sha256\/\u957fID<\/p>\n<h5>\u6b65\u9aa4 4&#xff1a;\u901a\u8fc7\u5206\u5c42 ID \u83b7\u53d6\u5206\u5c42\u7f13\u5b58 ID<\/h5>\n<p>\u8def\u5f84&#xff1a;layerdb\/sha256\/\u5206\u5c42ID\/cache-id<\/p>\n<p>cat layerdb\/sha256\/\u5206\u5c42ID\/cache-id<\/p>\n<h5>\u6b65\u9aa4 5&#xff1a;\u67e5\u770b\u8be5\u5206\u5c42\u5b9e\u9645\u6587\u4ef6\u5b58\u50a8\u76ee\u5f55<\/h5>\n<p>\u8def\u5f84&#xff1a;\/var\/lib\/docker\/overlay2\/\u7f13\u5b58ID\/diff\/<\/p>\n<p>ls \/var\/lib\/docker\/overlay2\/\u7f13\u5b58ID\/diff\/<\/p>\n<h4>3. \u955c\u50cf\u5e95\u5c42\u4e0e\u4e2d\u95f4\u5c42\u67e5\u627e\u89c4\u5219<\/h4>\n<p>\u67e5\u627e\u76ee\u6807&#xff1a;\u627e\u5230\u955c\u50cf\u5c42\u6700\u5e95\u5c42&#xff0c;\u518d\u4f9d\u6b21\u67e5\u627e\u5404\u4e2d\u95f4\u5c42\u3002<\/p>\n<p>Docker \u5185\u5bb9\u5bfb\u5740\u673a\u5236&#xff1a;Docker \u4f9d\u636e\u6587\u4ef6\u5185\u5bb9\u7d22\u5f15\u955c\u50cf\u4e0e\u955c\u50cf\u5c42&#xff0c;\u901a\u8fc7 rootfs \u4e2d\u7684 diff_id \u8ba1\u7b97 chainID&#xff0c;\u4f9d\u9760 chainID \u67e5\u8be2 layer \u4fe1\u606f&#xff0c;\u6700\u7ec8\u5b9a\u4f4d\u955c\u50cf\u5c42\u6587\u4ef6\u3002<\/p>\n<p>chainID \u8ba1\u7b97\u89c4\u5219&#xff1a;<\/p>\n<li>\u6700\u5e95\u5c42\u955c\u50cf\u5c42&#xff1a;diff_id &#061; chainID&#xff0c;\u53ef\u76f4\u63a5\u901a\u8fc7 diff_id \u627e\u5230\u5bf9\u5e94\u6587\u4ef6\u3002<\/li>\n<li>\u4e2d\u95f4\u5c42\u955c\u50cf\u5c42&#xff1a;chainID(n) &#061; SHA256(chainID(n-1) &#043; diffID(n))&#xff0c;\u9700\u57fa\u4e8e\u4e0a\u4e00\u5c42 chainID \u4e0e\u5f53\u524d\u5c42 diffID \u8ba1\u7b97\u3002<\/li>\n<p>\u67e5\u770b\u955c\u50cf diff_ids \u793a\u4f8b&#xff1a;<\/p>\n<p>cat \/var\/lib\/docker\/image\/overlay2\/imagedb\/content\/sha256\/22bd1541745359072c06a72a23f4f6c52dbb685424e0d5b29008ae4eb2683698<\/p>\n<p>rootfs \u5206\u5c42 diff_ids \u5b57\u6bb5\u793a\u4f8b&#xff1a;<\/p>\n<p>&#034;rootfs&#034;:{&#034;type&#034;:&#034;layers&#034;,&#034;diff_ids&#034;:[<br \/>\n&#034;sha256:1bb35e8b4de116e84b2ccf614cce4e309b6043bf2cd35543d8394edeaeb587e3&#034;,<br \/>\n&#034;sha256:cff9e7c67fbb49f4a3d39a66187b50cb525ac501d92b8a921b6877270b6f4ae5&#034;,<br \/>\n&#034;sha256:c29414fee8ae39b813dd7a744a2acf3e6d755fc70b2ea2bff9b707171a9fd41b&#034;,<br \/>\n&#034;sha256:05afaee498cfc72f71eb89da7586190efa6370883fbb51f1f8e1aab1942aa7a0&#034;,<br \/>\n&#034;sha256:2649de4780441086779fb6d6f7645e257f90fb1729b0a36898b8b5faba0f7d86&#034;,<br \/>\n&#034;sha256:215876b361535855516505977b46790e7f44f693f7473c1efaf8b2c7dac4f241a&#034;,<br \/>\n&#034;sha256:f3cecf76da4f34560262476c610533206d0f8e3344f896cc2fb0e59efcc0516a&#034;<br \/>\n]}<\/p>\n<p>\u6570\u7ec4\u5185\u987a\u5e8f\u81ea\u4e0a\u800c\u4e0b\u4e3a&#xff1a;\u5e95\u5c42 \u2192 \u5404\u4e2d\u95f4\u5c42 \u2192 \u9876\u5c42\u3002<\/p>\n<h4>4. \u4e2d\u95f4\u5c42 chainID \u8ba1\u7b97\u793a\u4f8b<\/h4>\n<p>\u4ee5\u300c\u7b2c 2 \u4e2a\u4e2d\u95f4\u5c42\u300d\u4e3a\u4f8b&#xff1a;<\/p>\n<li>\n<p>\u5206\u5c42\u6570\u636e<\/p>\n<ul>\n<li>\u5e95\u5c42 diff_id&#xff1a;sha256:1bb35e8b4de116e84b2ccf614cce4e309b6043bf2cd35543d8394edeaeb587e3<\/li>\n<li>\u7b2c 2 \u4e2a\u4e2d\u95f4\u5c42 diff_id&#xff1a;sha256:cff9e7c67fbb49f4a3d39a66187b50cb525ac501d92b8a921b6877270b6f4ae5<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8ba1\u7b97\u903b\u8f91&#xff1a;\u62fc\u63a5\u4e0a\u4e00\u5c42 chainID&#xff08;\u5e95\u5c42 diff_id&#xff09;\u4e0e\u5f53\u524d\u5c42 diff_id&#xff0c;\u5bf9\u62fc\u63a5\u5b57\u7b26\u4e32\u505a sha256 \u54c8\u5e0c&#xff0c;\u5f97\u5230\u5f53\u524d\u5c42 chainID\u3002<\/p>\n<\/li>\n<li>\n<p>\u5b9e\u64cd\u547d\u4ee4<\/p>\n<\/li>\n<p>echo -n &#034;sha256:1bb35e8b4de116e84b2ccf614cce4e309b6043bf2cd35543d8394edeaeb587e3 sha256:cff9e7c67fbb49f4a3d39a66187b50cb525ac501d92b8a921b6877270b6f4ae5&#034; | sha256sum &#8211;<\/p>\n<li>\u8f93\u51fa\u7ed3\u679c&#xff08;\u8be5\u4e2d\u95f4\u5c42 chainID&#xff09;&#xff1a;c48247a077eb9c2db74e784dce13198fac9ea62484b6073f1a553ab43feeb39b<\/li>\n<h3>\u56db\u3001\u5bb9\u5668\u4e0e\u955c\u50cf\u7684\u5173\u7cfb&#xff08;Nginx Overlay \u6f14\u793a&#xff09;<\/h3>\n<h4>1. \u542f\u52a8 Nginx \u5bb9\u5668<\/h4>\n<p># \u540e\u53f0\u8fd0\u884c nginx \u955c\u50cf<br \/>\ndocker run -d nginx:latest<br \/>\n# \u67e5\u770b\u8fd0\u884c\u4e2d\u7684 nginx \u5bb9\u5668<br \/>\ndocker ps | grep nginx<\/p>\n<p>\u8f93\u51fa\u793a\u4f8b\u5bb9\u5668 ID&#xff1a;381b3e88e209<\/p>\n<h4>2. \u67e5\u770b\u5bb9\u5668 overlay \u6302\u8f7d\u4fe1\u606f<\/h4>\n<p>mount | grep overlay<\/p>\n<p>\u6302\u8f7d\u5b57\u6bb5\u62c6\u89e3&#xff1a;<\/p>\n<li>\u6302\u8f7d\u70b9&#xff1a;\/var\/lib\/docker\/overlay2\/\u7f13\u5b58ID\/merged<\/li>\n<li>lowerdir&#xff1a;\u4ee5 : \u5206\u9694\u7684\u76ee\u5f55\u5217\u8868&#xff0c;\u5bf9\u5e94\u955c\u50cf\u6240\u6709\u53ea\u8bfb\u5206\u5c42&#xff08;\u5e95\u5c42 &#043; \u5404\u4e2d\u95f4\u5c42&#xff09;<\/li>\n<li>upperdir&#xff1a;\u5bb9\u5668\u4e13\u5c5e\u8bfb\u5199\u5c42\u76ee\u5f55&#xff0c;\u6240\u6709\u5bb9\u5668\u5185\u4fee\u6539\u90fd\u4fdd\u5b58\u81f3\u6b64<\/li>\n<li>workdir&#xff1a;OverlayFS \u5de5\u4f5c\u76ee\u5f55&#xff0c;\u7528\u4e8e\u6267\u884c copy_up \u590d\u5236\u64cd\u4f5c<\/li>\n<h4>3. Overlay \u8054\u5408\u6587\u4ef6\u7cfb\u7edf\u56db\u5c42\u7ed3\u6784<\/h4>\n<li>lowerdir&#xff08;\u53ea\u8bfb\u5c42&#xff09;&#xff1a;\u955c\u50cf\u7684\u6240\u6709\u955c\u50cf\u5206\u5c42&#xff0c;\u4ec5\u53ef\u8bfb\u3001\u4e0d\u53ef\u4fee\u6539\u3002<\/li>\n<li>upperdir&#xff08;\u8bfb\u5199\u5c42&#xff09;&#xff1a;\u5bb9\u5668\u72ec\u7acb\u53ef\u5199\u5c42&#xff0c;\u5bb9\u5668\u5185\u65b0\u589e\u3001\u4fee\u6539\u3001\u5220\u9664\u6587\u4ef6\u5168\u90e8\u8bb0\u5f55\u5728\u6b64&#xff0c;\u4e0d\u6539\u52a8\u5e95\u5c42\u955c\u50cf\u3002<\/li>\n<li>workdir&#xff08;\u5de5\u4f5c\u5c42&#xff09;&#xff1a;OverlayFS \u5185\u90e8\u4e34\u65f6\u76ee\u5f55&#xff0c;\u5b9e\u73b0 copy_up \u673a\u5236&#xff1a;\u8bfb\u53d6\u53ea\u8bfb\u5c42\u6587\u4ef6\u5e76\u590d\u5236\u5230 upperdir \u518d\u4fee\u6539\u3002<\/li>\n<li>merged&#xff08;\u8054\u5408\u89c6\u56fe\u6302\u8f7d\u70b9&#xff09;&#xff1a;\u5bf9\u5bb9\u5668\u8fdb\u7a0b\u5c55\u793a\u7edf\u4e00\u5408\u5e76\u540e\u7684\u6587\u4ef6\u89c6\u56fe&#xff0c;\u5373\u5bb9\u5668\u5185\u770b\u5230\u7684\u5b8c\u6574\u6587\u4ef6\u7cfb\u7edf\u3002<\/li>\n<h4>4. \u67e5\u770b\u53ea\u8bfb\u5c42\u77ed ID<\/h4>\n<p>\u91cd\u70b9\u67e5\u770b\u5bb9\u5668 lowerdir \u955c\u50cf\u53ea\u8bfb\u5c42&#xff1a;<\/p>\n<p>ls \/var\/lib\/docker\/overlay2\/l\/<\/p>\n<p>\u8f93\u51fa\u4e00\u5806\u5c42\u77ed ID \u5b57\u7b26\u4e32\u3002<\/p>\n<p>cd \/var\/lib\/docker\/overlay2\/l\/<br \/>\n# \u7b2c 1 \u4e2a\u77ed ID \u662f\u521d\u59cb\u5316\u5c42&#xff0c;\u540d\u79f0\u5bf9\u5e94\u76ee\u5f55\u5e26 -init<br \/>\nls -l IJGJLS2P7M4G6NRVRHZHT72YZQ<br \/>\nlrwxrwxrwx 1 root root 77 7\u6708 19 21:44 IJGJLS2P7M4G6NRVRHZHT72YZQ -&gt; ..\/9f48c74e6e6b93df22db6474adc950b3bb1dd00cccf68df16f44cda1b1aa3635c-init\/diff<\/p>\n<p>ls -l 2J0F24V5EE3R50XZNGLKVPWW3E<br \/>\nlrwxrwxrwx 1 root root 72 7\u6708 18 07:23 2J0F24V5EE3R50XZNGLKVPWW3E -&gt; ..\/a18c4a00e8aa368aaf13844e20213bb4029ef4cf8f315dc3d00fb5c9f9b6f33c\/diff<\/p>\n<p>\u76ee\u5f55\u5185\u6587\u4ef6\u5747\u4e3a\u8f6f\u94fe\u63a5&#xff0c;\u6307\u5411\u5404\u5c42\u771f\u5b9e diff \u76ee\u5f55&#xff1b;\u5e26 -init \u7684\u4e3a\u5bb9\u5668\u521d\u59cb\u5316\u5e95\u5c42&#xff0c;\u5176\u4f59\u4e3a\u666e\u901a\u955c\u50cf\u53ea\u8bfb\u5c42\u3002<\/p>\n<ul>\n<li>IJGJLS2P7M4G6NRVRHZHT72YZQ \u6620\u5c04\u5bb9\u5668\u7684\u521d\u59cb\u5316\u5c42 init&#xff0c;\u8be5\u5c42\u5305\u542b\u4e0e\u5bb9\u5668\u914d\u7f6e\u76f8\u5173\u7684\u6587\u4ef6\u5185\u5bb9&#xff0c;\u662f\u53ea\u8bfb\u7684\u3002<\/li>\n<li>\u5176\u4f59 ID \u5206\u522b\u5bf9\u5e94\u955c\u50cf\u5404\u5c42\u6587\u4ef6\u5185\u5bb9&#xff0c;\u6620\u5c04\u5230\u955c\u50cf\u5c42\u7684 diff \u76ee\u5f55\u3002<\/li>\n<\/ul>\n<h4>5. \u5bb9\u5668\u5185\u5199\u6587\u4ef6\u6d4b\u8bd5<\/h4>\n<p>\u542f\u52a8\u5bb9\u5668\u540e&#xff0c;Docker \u5c06\u955c\u50cf\u5185\u5bb9 mount \u5230\u5bb9\u5668\u4e2d\u3002\u82e5\u5728\u5bb9\u5668\u5185\u4fee\u6539\u6587\u4ef6&#xff0c;\u662f\u5426\u4f1a\u5f71\u54cd\u955c\u50cf&#xff1f;<\/p>\n<p>\u7ed3\u8bba&#xff1a;\u7531 overlay2 \u5206\u5c42\u7ed3\u6784\u53ef\u77e5&#xff0c;\u5bb9\u5668\u5185\u5199\u6587\u4ef6\u4f1a\u5199\u5165 upperdir&#xff08;\u8bfb\u5199\u5c42&#xff09;&#xff0c;\u4e0d\u4f1a\u4fee\u6539 lowerdir \u5e95\u5c42\u955c\u50cf\u3002<\/p>\n<p>\u6ce8&#xff1a;\u672c\u6b21\u6f14\u793a\u5bb9\u5668\u53ea\u6709\u4e00\u5c42\u955c\u50cf&#xff0c;\u56e0\u6b64\u5c55\u793a\u8f83\u4e3a\u76f4\u89c2\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f55\u5bb9\u5668\u955c\u50cf\u4e0e Overlay2 \u5b58\u50a8\u4e00\u3001\u5bb9\u5668\u955c\u50cf\u6982\u8ff01. Docker \u955c\u50cf2. \u8054\u5408\u6587\u4ef6\u7cfb\u7edf&#xff08;UnionFS&#xff09;\u4e8c\u3001Docker Overlay2 \u5b58\u50a8\u9a71\u52a81. \u5b58\u50a8\u9a71\u52a8\u8bf4\u660e2. \u6838\u5fc3\u6982\u5ff53. Overlay2 \u5206\u5c42\u7ed3\u67844. \u5143\u6570\u636e&#xff08;Metadata&#xff09;5. \u4e3a\u4ec0\u4e48\u4e0b\u8f7d\u6162\u3001\u5220\u9664\u5feb&#xff1f;6. OverlayFS \u4e0e overlay2 \u7684\u533a\u522b\u4e09\u3001\u955c\u50cf\u5c42\u6587\u4ef6\u67e5\u627e\u4e0e chainID \u8ba1\u7b971. \u67e5\u627e\u955c\u50cf\u6307\u5b9a\u5c42\u6587\u4ef6\u5185\u5bb9<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[27,103,121,44],"topic":[],"class_list":["post-95161","post","type-post","status-publish","format-standard","hentry","category-server","tag-docker","tag-ubuntu","tag-121","tag-44"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010DOCKER\u8fdb\u9636\u3011-2 \u5bb9\u5668\u955c\u50cf\u7684\u5206\u5c42 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/95161.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010DOCKER\u8fdb\u9636\u3011-2 \u5bb9\u5668\u955c\u50cf\u7684\u5206\u5c42 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u76ee\u5f55\u5bb9\u5668\u955c\u50cf\u4e0e Overlay2 \u5b58\u50a8\u4e00\u3001\u5bb9\u5668\u955c\u50cf\u6982\u8ff01. Docker \u955c\u50cf2. \u8054\u5408\u6587\u4ef6\u7cfb\u7edf&#xff08;UnionFS&#xff09;\u4e8c\u3001Docker Overlay2 \u5b58\u50a8\u9a71\u52a81. \u5b58\u50a8\u9a71\u52a8\u8bf4\u660e2. \u6838\u5fc3\u6982\u5ff53. Overlay2 \u5206\u5c42\u7ed3\u67844. \u5143\u6570\u636e&#xff08;Metadata&#xff09;5. \u4e3a\u4ec0\u4e48\u4e0b\u8f7d\u6162\u3001\u5220\u9664\u5feb&#xff1f;6. 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