{"id":7506,"date":"2022-09-24T11:00:19","date_gmt":"2022-09-24T03:00:19","guid":{"rendered":"https:\/\/egonlin.com\/?p=7506"},"modified":"2022-09-24T11:04:02","modified_gmt":"2022-09-24T03:04:02","slug":"linux%e4%b8%8b%e5%bf%ab%e9%80%9f%e5%88%a0%e9%99%a4%e5%a4%a7%e9%87%8f%e6%96%87%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=7506","title":{"rendered":"\u7b2c\u516d\u8282\uff1alinux\u4e0b\u5feb\u901f\u5220\u9664\u5927\u91cf\u6587\u4ef6"},"content":{"rendered":"

\u5047\u5982\u4f60\u8981\u5728linux\u4e0b\u5220\u9664\u5927\u91cf\u6587\u4ef6\uff0c\u6bd4\u5982100\u4e07\u30011000\u4e07\uff0c\u50cf\/var\/spool\/clientmqueue\/\u7684mail\u90ae\u4ef6\uff0c \u50cf\/usr\/local\/nginx\/proxy_temp\u7684nginx\u7f13\u5b58\u7b49\uff0c\u90a3\u4e48rm -rf *\u53ef\u80fd\u5c31\u4e0d\u597d\u4f7f\u4e86\u3002\u53ef\u4ee5\u4f7f\u7528rsync<\/p>\n

\u4e3a\u4ec0\u4e48rsync\u80fd\u591f\u5feb\u901f\u5220\u9664\u5927\u6587\u4ef6
\n1\u3001rm\u547d\u4ee4\u5927\u91cf\u8c03\u7528\u4e86lstat64\u548cunlink\uff0c\u53ef\u4ee5\u63a8\u6d4b\u5220\u9664\u6bcf\u4e2a\u6587\u4ef6\u524d\u90fd\u4ece\u6587\u4ef6\u7cfb\u7edf\u4e2d\u505a\u8fc7\u4e00\u6b21lstat\u64cd\u4f5c\u3002\u8fc7\u7a0b\uff1a\u6b63\u5f0f\u5220\u9664\u5de5\u4f5c\u7684\u7b2c\u4e00\u9636\u6bb5\uff0c\u9700\u8981\u901a\u8fc7getdirentries64\u8c03\u7528\uff0c\u5206\u6279\u8bfb\u53d6\u76ee\u5f55\uff08\u6bcf\u6b21\u5927\u7ea6\u4e3a4K\uff09\uff0c\u5728\u5185\u5b58\u4e2d\u5efa\u7acbrm\u7684\u6587\u4ef6\u5217\u8868\uff1b\u7b2c\u4e8c\u9636\u6bb5\uff0clstat64\u786e\u5b9a\u6240\u6709\u6587\u4ef6\u7684\u72b6\u6001\uff1b\u7b2c\u4e09\u9636\u6bb5\uff0c\u901a\u8fc7unlink\u6267\u884c\u5b9e\u9645\u5220\u9664\u3002\u8fd9\u4e09\u4e2a\u9636\u6bb5\u90fd\u6709\u6bd4\u8f83\u591a\u7684\u7cfb\u7edf\u8c03\u7528\u548c\u6587\u4ef6\u7cfb\u7edf\u64cd\u4f5c\u3002<\/p>\n

2\u3001rsync\u6240\u505a\u7684\u7cfb\u7edf\u8c03\u7528\u5f88\u5c11\uff1a\u6ca1\u6709\u9488\u5bf9\u5355\u4e2a\u6587\u4ef6\u505alstat\u548cunlink\u64cd\u4f5c\u3002\u547d\u4ee4\u6267\u884c\u524d\u671f\uff0crsync\u5f00\u542f\u4e86\u4e00\u7247\u5171\u4eab\u5185\u5b58\uff0c\u901a\u8fc7mmap\u65b9\u5f0f\u52a0\u8f7d\u76ee\u5f55\u4fe1\u606f\u3002\u53ea\u505a\u76ee\u5f55\u540c\u6b65\uff0c\u4e0d\u9700\u8981\u9488\u5bf9\u5355\u4e2a\u6587\u4ef6\u505aunlink\u3002<\/p>\n

\u53e6\u5916\uff0c\u5728\u5176\u4ed6\u4eba\u7684\u8bc4\u6d4b\u91cc\uff0crm\u7684\u4e0a\u4e0b\u6587\u5207\u6362\u6bd4\u8f83\u591a\uff0c\u4f1a\u9020\u6210System CPU\u5360\u7528\u8f83\u591a\u2014\u2014\u5bf9\u4e8e\u6587\u4ef6\u7cfb\u7edf\u7684\u64cd\u4f5c\uff0c\u7b80\u5355\u589e\u52a0\u5e76\u53d1\u6570\u5e76\u4e0d\u603b\u80fd\u63d0\u5347\u64cd\u4f5c\u901f\u5ea6\u3002<\/p>\n

tips\uff1a
\n\u5f53SRC\u548cDEST\u6587\u4ef6\u6027\u8d28\u4e0d\u4e00\u81f4\u65f6\u5c06\u4f1a\u62a5\u9519
\n\u5f53SRC\u548cDEST\u6027\u8d28\u90fd\u4e3a\u6587\u4ef6\u3010f\u3011\u65f6\uff0c\u610f\u601d\u662f\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9\u800c\u4e0d\u662f\u5220\u9664\u6587\u4ef6
\n\u5f53SRC\u548cDEST\u6027\u8d28\u90fd\u4e3a\u76ee\u5f55\u3010d\u3011\u65f6\uff0c\u610f\u601d\u662f\u5220\u9664\u8be5\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u6587\u4ef6\uff0c\u4f7f\u5176\u53d8\u4e3a\u7a7a\u76ee\u5f55
\n\u6700\u91cd\u8981\u7684\u662f\uff0c\u5b83\u7684\u5904\u7406\u901f\u5ea6\u76f8\u5f53\u5feb\uff0c\u5904\u7406\u51e0\u4e2aG\u7684\u6587\u4ef6\u4e5f\u5c31\u662f\u79d2\u7ea7\u7684\u4e8b
\n\u6700\u6838\u5fc3\u7684\u5185\u5bb9\u662f\uff1arsync\u5b9e\u9645\u4e0a\u7528\u7684\u5c31\u662f\u66ff\u6362\u539f\u7406<\/p>\n

\u603b\u7ed3\uff1a<\/p>\n

\u628a\u6587\u4ef6\u7cfb\u7edf\u7684\u76ee\u5f55\u4e0e\u4e66\u7c4d\u7684\u76ee\u5f55\u505a\u7c7b\u6bd4\uff0crm\u5220\u9664\u5185\u5bb9\u65f6\uff0c\u5c06\u76ee\u5f55\u7684\u6bcf\u4e00\u4e2a\u6761\u76ee\u9010\u4e2a\u5220\u9664(unlink)\uff0c\u9700\u8981\u5faa\u73af\u91cd\u590d\u64cd\u4f5c\u5f88\u591a\u6b21\uff1brsync\u5220\u9664\u5185\u5bb9\u65f6\uff0c\u5efa\u7acb\u597d\u65b0\u7684\u7a7a\u76ee\u5f55\uff0c\u66ff\u6362\u6389\u8001\u76ee\u5f55\uff0c\u57fa\u672c\u6ca1\u5f00\u9500\u3002<\/p>\n

\u6628\u5929\u9047\u5230\u4e00\u4e2a\u95ee\u9898\uff0c\u5728Linux\u4e2d\u6709\u4e00\u4e2a\u6587\u4ef6\u5939\u91cc\u9762\u542b\u6709\u5927\u91cf\u7684Cache\u6587\u4ef6\uff08\u5939\uff09\uff0c\u6570\u91cf\u7ea7\u53ef\u80fd\u5728\u767e\u4e07\u7ea7\u522b\uff0c\u4f7f\u7528rm -rf .\/* \u5220\u9664\u65f6\u95f4\u6162\u5230\u4e0d\u53ef\u63a5\u53d7\u3002Google\u4e86\u4e00\u4e0b\uff0c\u67e5\u5230\u4e86\u4e00\u79cd\u65b9\u6cd5\uff0c\u8bd5\u7528\u4e86\u4e0b\u786e\u5b9e\u6bd4\u5355\u7eaf\u4f7f\u7528rm\u5feb\u4e86\u4e00\u4e2a\u6570\u91cf\u7ea7\u3002\n\n\u65b9\u6cd5\u89c1\u4e0b\uff1a\n\n1\uff09\u9996\u5148\u5efa\u7acb\u4e00\u4e2a\u7a7a\u767d\u6587\u4ef6\u5939\u3002\n\nmkdir \/tmp\/empty\n2\uff09\u4e4b\u540e\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u5373\u53ef\u5feb\u901f\u7684\u5220\u9664\u6587\u4ef6\u3002\n\nrsync --delete-before -d \/tmp\/empty\/ \/the\/folder\/you\/want\/delete\/\n\u539f\u6587\u4e2d\u8bf4\u4e0d\u8981\u5fd8\u8bb0\u6587\u4ef6\u5939\u540e\u7684\u201c\/\u201d\n\nrsync\u63d0\u4f9b\u4e86\u4e00\u4e9b\u8ddf\u5220\u9664\u76f8\u5173\u7684\u53c2\u6570 \nrsync --help | grep delete \n     --del                   an alias for --delete-during \n     --delete                delete files that don't exist on the sending side \n     --delete-before         receiver deletes before transfer (default) \n     --delete-during         receiver deletes during transfer, not before \n     --delete-after          receiver deletes after transfer, not before \n     --delete-excluded       also delete excluded files on the receiving side \n     --ignore-errors         delete even if there are I\/O errors \n     --max-delete=NUM        don't delete more than NUM files \n\nrsync --delete-before -a -H -v --progress --stats \/tmp\/test\/ log\/\n\u8fd9\u6837\u6211\u4eec\u8981\u5220\u9664\u7684log\u76ee\u5f55\u5c31\u4f1a\u88ab\u6e05\u7a7a\u4e86\uff0c\u5220\u9664\u7684\u901f\u5ea6\u4f1a\u975e\u5e38\u5feb\u3002rsync\u5b9e\u9645\u4e0a\u7528\u7684\u662f\u66ff\u6362\u539f\u7406\uff0c\u5904\u7406\u6570\u5341\u4e07\u4e2a\u6587\u4ef6\u4e5f\u662f\u79d2\u5220\u3002\n\n\u9009\u9879\u8bf4\u660e\uff1a\n\u2013delete-before \u63a5\u6536\u8005\u5728\u4f20\u8f93\u4e4b\u524d\u8fdb\u884c\u5220\u9664\u64cd\u4f5c\n\u2013progress \u5728\u4f20\u8f93\u65f6\u663e\u793a\u4f20\u8f93\u8fc7\u7a0b\n-a \u5f52\u6863\u6a21\u5f0f\uff0c\u8868\u793a\u4ee5\u9012\u5f52\u65b9\u5f0f\u4f20\u8f93\u6587\u4ef6\uff0c\u5e76\u4fdd\u6301\u6240\u6709\u6587\u4ef6\u5c5e\u6027\n-H \u4fdd\u6301\u786c\u8fde\u63a5\u7684\u6587\u4ef6\n-v \u8be6\u7ec6\u8f93\u51fa\u6a21\u5f0f\n\u2013stats \u7ed9\u51fa\u67d0\u4e9b\u6587\u4ef6\u7684\u4f20\u8f93\u72b6\u6001<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5047\u5982\u4f60\u8981\u5728linux\u4e0b\u5220\u9664\u5927\u91cf\u6587\u4ef6\uff0c\u6bd4\u5982100\u4e07\u30011000\u4e07\uff0c\u50cf\/var\/spool\/clientmqueue […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[34],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/7506"}],"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=7506"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/7506\/revisions"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}