{"id":195,"date":"2008-07-25T09:23:18","date_gmt":"2008-07-25T09:23:18","guid":{"rendered":"http:\/\/apollo89.com\/wordpress\/?p=195"},"modified":"2013-02-06T23:41:22","modified_gmt":"2013-02-06T14:41:22","slug":"rsync%eb%a5%bc-%ec%82%ac%ec%9a%a9%ed%95%9c-%eb%8d%b0%ec%9d%b4%ed%83%80-%eb%b0%b1%ec%97%85","status":"publish","type":"post","link":"https:\/\/apollo89.com\/wordpress\/?p=195","title":{"rendered":"rsync \ub780?"},"content":{"rendered":"

 <\/p>\n

1. Rsync\ub780?<\/p>\n

Network\uc744 \ud1b5\ud574\uc11c \ub370\uc774\ud130 \ubc31\uc5c5\uc744 \ud558\ub294 \ud234\uc774\ub2e4. \uae30\uc874 RCP\ub97c \ubcf4\uc644\ud558\uace0, \ud604\uc7ac SCP(SSH)\ub97c \ud1b5\ud574\uc11c \ubcf4\uc548\uc744 \uc720\uc9c0\ud560 \uc218 \uc788\ub2e4.
\n\uc774 command\ub294 \uc6f9 \uc11c\ubc84\uc758 \ubd80\ud558\ub97c \ubd84\uc0b0\ud558\uae30 \uc704\ud574\uc11c remote sync(copy)\ub97c \ud558\uae30 \uc704\ud55c \uc6a9\ub3c4\ub85c \uac1c\ubc1c\ub418\uc5c8\ub2e4.<\/p>\n

– RSYNC Memory \uc0ac\uc6a9 \ube44\uc728
\nFile\ub2f9 100byte\uc758 \uba54\ubaa8\ub9ac\uac00 \uc18c\uc694\ub41c\ub2e4. \ud30c\uc77c \uc0ac\uc774\uc988\uc5d0 \uc0c1\uad00\uc5c6\uc774 \ud30c\uc77c \uc218\uc5d0 \uc758\uc874\ud558\uba70 1000,000 files\uc774 \uc788\uc744 \uacbd\uc6b0 100Mbyte\uc758 \uba54\ubaa8\ub9ac\uac00 \uc18c\uc694\ub41c\ub2e4. \ub610\ud55c option\uc5d0 \ub530\ub77c\uc11c \uba54\ubaa8\ub9ac\uac00 \ub354 \uc18c\uc694\ub420 \uc218 \uc788\ub2e4.<\/p>\n

– \uc11c\ube44\uc2a4 \uc124\uc815\uc758 \uae30\ubcf8
\n * \uc11c\ube44\uc2a4 \ud3ec\ud2b8: 873
\n * \ub0b4\ubd80 \uc0ac\uc6a9 Shell (RSH,SSH) \ucd08\uae30 configuration\uc5d0\uc11c \uc120\ud0dd \uc801\uc6a9\ud560 \uc218 \uc788\ub2e4. \ud604\uc7ac Default\ub85c Remote shell\uc740 SSH\ub97c \uc801\uc6a9\ud558\uace0 \uc788\ub2e4.
\n * \/etc\/rsyncd.conf, \uac01\uc885 rsync option\uc744 \uc124\uc815\ud574 \uc8fc\ub294 \ubd80\ubd84\uc774\ub2e4.<\/p>\n

– RSYNC\uc5d0\uc11c \uc0ac\uc6a9\ub418\ub294 Algorithm\uc758 \uad6c\uc131
\n * Rolling Checksum (16-bit hash of the 32-bit rolling checksum)
\n * Checksum searching \uc740 3\ub2e8\uacc4\uc5d0 \ub098\ub204\uc5b4\uc11c \ub370\uc774\ud130\ub97c \ube44\uad50\ud55c\ub2e4.<\/p>\n

– RSYNC \ub780 \ubb34\uc5c7\uc778\uac00?
\n\u201drsync Algorithm\u201d\uc744 \uc0ac\uc6a9\ud574\uc11c \uc6d0\uaca9\uc9c0 \ud30c\uc77c\uc744 \uac00\uc7a5 \ube60\ub978 \ubc29\ubc95\uc73c\ub85c \uac00\uc838\uc624\uac8c \ub41c\ub2e4.
\n\ub2e8\uc21c\ud788 \uac74\ub108\ud3b8 \uc6d0\uaca9\uc9c0\uc758 \ud30c\uc77c \ucc28\uc774\uc810\ub9cc\uc744 \ubcf4\ub0b4\ub294 \uac83\uc5d0 \uc758\ud574 \uc6b4\uc601\uc774 \ub41c\ub2e4.
\n\uc804\uccb4 \ud30c\uc77c\uc815\ubcf4\ub97c \uac00\uc838\uc640\uc11c \ucc98\ub9ac\ud558\ub294 \uac83\uc774 \uc5c6\uc774 \uc9c4\ud589 \ub41c\ub2e4. \uc774\uac83\uc740 \uc5b8\ub73b \ubcf4\uae30\uc5d0 \ub450\uac1c\uc758 \ud30c\uc77c\uc744 local access\ud558\ub294 \uac83 \uc5c6\uc774 \ud30c\uc77c \ube44\uad50\ub97c \ud55c\ub2e4\ub294 \uac83\uc774 \uc774\ud574\uac00 \uc548\ub420\uc9c0 \ubaa8\ub974\uc9c0\ub9cc \u201crsync Algorithm\u201d\uc744 \ud655\uc778\ud558\uba74 \uc774\uac83\uc774 \uac00\ub2a5\ud558\ub2e4\ub294 \uac83\uc744 \uc54c \uc218 \uc788\ub2e4.<\/p>\n

– RSYNC Server \ucde8\uc57d\uc131 \uc810\uac80
\n * netstat\ub97c \uc0ac\uc6a9\ud574\uc11c \ud604\uc7ac TCP port 873\uc744 \uc810\uac80\ud55c\ub2e4. \uc544\ubb34\ub7f0 \uac12\uc774 \uc5c6\ub2e4\uba74 rsync server\uac00 \ub3d9\uc791\ud558\uc9c0 \uc54a\ub294 \uac83\uc774\ub2e4.<\/p>\n

2. Rsync Algorithm
\n\uc54c\ud30c\uc11c\ubc84 \uadf8\ub9ac\uace0 \ubca0\ud0c0\uc11c\ubc84\uac00 \uc788\ub2e4\uace0 \uac00\uc815\ud55c\ub2e4. \uc54c\ud30c\uc11c\ubc84\ub294 \ud30c\uc77c A\uc5d0 access\ud558\uace0 \ubca0\ud0c0\uc11c\ubc84\ub294 \ud30c\uc77c B\uc5d0 access\ud55c\ub2e4. \uadf8\ub9ac\uace0 \uadf8 \ud30c\uc77c \ub450\uac1c\ub294 \u201csimilar\u201d\ud558\ub2e4. \ub450 \uc11c\ubc84\uc0ac\uc774\ub294 \ub290\ub9b0 \ub124\ud2b8\uc6cc\ud06c\ub85c \uc5f0\uacb0\ub418\uc5b4 \uc788\ub2e4. (\ub290\ub9b0 \ub124\ud2b8\uc6cc\ud06c\uc5d0\uc11c \ub3d9\uc791\ud55c\ub2e4\ub294 \uac00\uc815 \ud558\uc5d0 \uc9c4\ud589)
\nChecksum\ub9cc\uc744 \uac00\uc9c0\uace0\uc11c \ubcc0\uacbd\ub41c \ube14\ub85d\uacfc \ub3d9\uc77c\ud55c \ube14\ub85d\uc5d0 \ub300\ud55c reference\ub9cc\uc744 \uc804\uc1a1\ud558\ub294 \uac83\uc73c\ub85c \ub124\ud2b8\uc6cc\ud06c \uc18d\ub3c4\uac00 \ub290\ub9b0 \ud658\uacbd\uc5d0\uc11c \ubcc0\uacbd\ub41c \ub370\uc774\ud130\uc758 \ube60\ub978 \ubcf5\uc0ac\uac00 \uac00\ub2a5\ud558\uac8c \ub41c\ub2e4.<\/p>\n

The rsync algorithm consists of the following steps:
\n1) \ubca0\ud0c0 \uc11c\ubc84\uac00 S bytes\uc758 overlapping\ub418\uc9c0 \uc54a\uc740 \uace0\uc815\ub41c \ube14\ub85d\uc0ac\uc774\uc988\uc5d0 \uc5f0\uc18d\uc73c\ub85c file B\ub97c \ubd84\ud560\ud55c\ub2e4. (S bytes\ub294 500~1000\uc0ac\uc774\uc758 \uac00\uc7a5 \ucd5c\uc801\uc758 \uc0c1\ud0dc)
\n2) \ubca0\ud0c0 \uc11c\ubc84\uc5d0\uc11c\ub294 \uc774\ub4e4 \ube14\ub85d\uc744 \ub450\uac1c\uc758 checksum\uc73c\ub85c \uacc4\uc0b0\ud55c\ub2e4. Rolling 32-bit checksum, strong 128-bit MD4 checksum\uc73c\ub85c \uacc4\uc0b0\ud55c\ub2e4.
\n3) \ubca0\ud0c0 \uc11c\ubc84\uac00 \uc54c\ud30c\uc11c\ubc84\uc5d0\uac8c \uc774\ub4e4 checksum\uac12\uc744 \uc804\uc1a1\ud55c\ub2e4.
\n4) \uc54c\ud30c\uc11c\ubc84\ub294 B\ube14\ub85d\uc758 \ud558\ub098\ub97c \uac00\uc9c0\uace0\uc11c \ub3d9\uc77c\ud55c weak checksum\uacfc strong checksum\uc744 \uac00\uc9c4 S bytes \uae38\uc774\uc758 \ubaa8\ub4e0 \ube14\ub85d\uc744 \ud30c\uc77c A\uc5d0\uc11c \ucc3e\ub294\ub2e4. \uc774\uac83\uc740 rolling checksum\uc758 \ud2b9\uc218\ud55c \uc131\uc9c8\uc744 \uc774\uc6a9\ud574\uc11c \uac00\uc7a5 \ube60\ub978 single pass\ub85c \uc9c4\ud589\ub41c\ub2e4.
\n5) \uc54c\ud30c\uc11c\ubc84\ub294 \ubca0\ud0c0\uc5d0\uac8c A\ud30c\uc77c copy\ub97c \uad6c\uc131\ud558\uae30\uc704\ud55c instruction\uc744 \ubcf4\ub0b8\ub2e4. \uac01\uac01\uc758 instruction\uc740 B\uc758 \ube14\ub85d reference\ub610\ub294 \ubb38\uc790\ub370\uc774\ud0c0\uc774\ub2e4. \ubb38\uc790\ub370\uc774\ud130\ub294 B\ube14\ub85d\uacfc \uc77c\uce58\ud558\uc9c0 \uc54a\ub294 A\uc758 \ubd80\ubd84\ub4e4\ub85c \uc804\uc1a1\ub41c\ub2e4. (\uc804\uc1a1\ub420 \ub54c\ub294 checksum\uacfc Block index\ub4e4\uc744 \uc704\ud55c \uc791\uc740 \uc591\uc758 \ub370\uc774\ud130\ub97c \ud3ec\ud568\ud55c\ub2e4).<\/p>\n

\uacb0\uacfc\uc801\uc73c\ub85c \ubca0\ud0c0\uc11c\ubc84\ub294 A\ub97c \ubcf5\uc0ac\ud574\uc11c \uac00\uc9c0\uac8c \ub41c\ub2e4. \uc774\uac83\uc740 B\uc5d0\uc11c \ubc1c\uacac\ub418\uc9c0 \uc54a\uc740 A\uc758 \ubd80\ubd84\ub4e4\uc5d0 \ud55c\uc815\ud574\uc11c\ub2e4. \uadf8\ub9ac\uace0 \uc774 Algorithm\uc740 \ub124\ud2b8\uc6cc\ud06c \ubd80\ud558\ub97c \ucd5c\uc18c\ud654\ud558\uae30 \uc704\ud574\uc11c \ub2e8\uc9c0 \ud55c\ubc88\uc758 round trip\ub9cc\uc744 \uc0ac\uc6a9\ud574\uc11c \uc804\uc1a1\ud55c\ub2e4.<\/p>\n

\ucc38\uace0)
\n\ud30c\uc77c\uc758 \ubcc0\uacbd\ubd80\ubd84\ub9cc\uc744 \uac00\uc9c0\uace0\uc11c \ubcc0\uacbd \ube14\ub85d\ub9cc\uc744 \uc804\uc1a1\ud558\ub294 \ubc29\uc2dd\uc774 \uc2e4\uc81c \ub370\uc774\ud130\uc758 consistency\ub97c \ubcf4\uc7a5\ud558\uc9c0\ub294 \ubabb\ud55c\ub2e4. \ubcc0\uacbd\ub41c \ud30c\uc77c\uc774 \uc788\uc744 \uacbd\uc6b0 \uc774 \ud30c\uc77c\uc744 \uc804\uccb4 \uc804\uc1a1\ud558\ub294 \ubc29\uc2dd\uc774 \uc544\ub2c8\uae30 \ub54c\ubb38\uc5d0 \uc804\uc1a1 \uc911\uc5d0 \ub124\ud2b8\uc6cc\ud06c \uc7a5\uc560\ub85c \uc778\ud55c \ub610\ub294 Checksum \uc5d0\ub7ec\ub85c \uc778\ud55c \ud30c\uc77c \ub370\uc774\ud130\uc758 consistency\ub97c \ubcf4\uc7a5\ud560 \uc218 \uc5c6\ub2e4.<\/p>\n

2.1 RSYNC Algorithm Picture.
\n\uc804\uc81c: \ub450\uac1c \ud30c\uc77c A\uc640 B\ub294 \uc720\uc0ac\ud558\ub2e4.
\n\"Rsync-comki\"<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

  1. Rsync\ub780? Network\uc744 \ud1b5\ud574\uc11c \ub370\uc774\ud130 \ubc31\uc5c5\uc744 \ud558\ub294 \ud234\uc774\ub2e4. \uae30\uc874 RCP\ub97c \ubcf4\uc644\ud558\uace0, \ud604\uc7ac SCP(SSH)\ub97c \ud1b5\ud574\uc11c \ubcf4\uc548\uc744 \uc720\uc9c0\ud560 \uc218 \uc788\ub2e4. \uc774 command\ub294 \uc6f9 \uc11c\ubc84\uc758 \ubd80\ud558\ub97c \ubd84\uc0b0\ud558\uae30 \uc704\ud574\uc11c remote sync(copy)\ub97c \ud558\uae30 \uc704\ud55c \uc6a9\ub3c4\ub85c \uac1c\ubc1c\ub418\uc5c8\ub2e4. – RSYNC Memory \uc0ac\uc6a9 \ube44\uc728 File\ub2f9 100byte\uc758 \uba54\ubaa8\ub9ac\uac00 … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[661,670],"tags":[887,223],"class_list":["post-195","post","type-post","status-publish","format-standard","hentry","category-system","category-util-tools","tag-algorithm","tag-rsync"],"yoast_head":"\nrsync \ub780? - Apollo89.com<\/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:\/\/apollo89.com\/wordpress\/?p=195\" \/>\n<meta property=\"og:locale\" content=\"ko_KR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"rsync \ub780? - Apollo89.com\" \/>\n<meta property=\"og:description\" content=\"  1. Rsync\ub780? Network\uc744 \ud1b5\ud574\uc11c \ub370\uc774\ud130 \ubc31\uc5c5\uc744 \ud558\ub294 \ud234\uc774\ub2e4. \uae30\uc874 RCP\ub97c \ubcf4\uc644\ud558\uace0, \ud604\uc7ac SCP(SSH)\ub97c \ud1b5\ud574\uc11c \ubcf4\uc548\uc744 \uc720\uc9c0\ud560 \uc218 \uc788\ub2e4. \uc774 command\ub294 \uc6f9 \uc11c\ubc84\uc758 \ubd80\ud558\ub97c \ubd84\uc0b0\ud558\uae30 \uc704\ud574\uc11c remote sync(copy)\ub97c \ud558\uae30 \uc704\ud55c \uc6a9\ub3c4\ub85c \uac1c\ubc1c\ub418\uc5c8\ub2e4. – RSYNC Memory \uc0ac\uc6a9 \ube44\uc728 File\ub2f9 100byte\uc758 \uba54\ubaa8\ub9ac\uac00 … Continue reading →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/apollo89.com\/wordpress\/?p=195\" \/>\n<meta property=\"og:site_name\" content=\"Apollo89.com\" \/>\n<meta property=\"article:published_time\" content=\"2008-07-25T09:23:18+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2013-02-06T14:41:22+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/apollo89.com\/wordpress\/wp-content\/uploads\/2008\/07\/Rsync-comki.gif\" \/>\n<meta name=\"author\" content=\"apollo89\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\uae00\uc4f4\uc774\" \/>\n\t<meta name=\"twitter:data1\" content=\"apollo89\" \/>\n\t<meta name=\"twitter:label2\" content=\"\uc608\uc0c1 \ub418\ub294 \ud310\ub3c5 \uc2dc\uac04\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\ubd84\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=195#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=195\"},\"author\":{\"name\":\"apollo89\",\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/#\\\/schema\\\/person\\\/93f56825cac3b2f18e5f107995066c82\"},\"headline\":\"rsync \ub780?\",\"datePublished\":\"2008-07-25T09:23:18+00:00\",\"dateModified\":\"2013-02-06T14:41:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=195\"},\"wordCount\":134,\"commentCount\":1,\"image\":{\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=195#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/apollo89.com\\\/wordpress\\\/wp-content\\\/uploads\\\/2008\\\/07\\\/Rsync-comki.gif\",\"keywords\":[\"Algorithm\",\"rsync\"],\"articleSection\":[\"System\",\"Util\\\/Tools\"],\"inLanguage\":\"ko-KR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=195#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=195\",\"url\":\"https:\\\/\\\/apollo89.com\\\/wordpress\\\/?p=195\",\"name\":\"rsync \ub780? 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- Apollo89.com","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/apollo89.com\/wordpress\/?p=195","og_locale":"ko_KR","og_type":"article","og_title":"rsync \ub780? - Apollo89.com","og_description":"  1. 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