unison + inotify 实现文件实时双向同步部署步骤
unison?+?inotify?實現文件實時雙向同步部署步驟
一.?Unison簡介
Unison是Windows、Linux以及其他Unix平臺下都可以使用的文件同步工具，它能使兩個文件夾（本地或網絡上的）保持內容的一致。Unison擁有與其它一些同步工具或文件系統的相同的特性，但也有自身的特點：
1.?跨平臺使用；
2.?對內核和用戶權限沒有特別要求；
3.?Unison是雙向的，它能自動處理兩分拷貝中更新沒有沖突的部分，有沖突的部分將會顯示出來讓用戶選擇更新策略；
4.?只要是能連通的兩臺主機，就可以運行unison，可以直接使用socket連接或安全的ssh連接方式，對帶寬的要求不高，使用類似rsync的壓縮傳輸協議。
二.?編譯安裝Unison
unison各種版本下載地址：
http://www.seas.upenn.edu/~bcpierce/unison//download.html
unison編譯器下載地址：
http://caml.inria.fr/pub/distrib
從以上地址可以下載各種平臺,各種版本的unison,有基于源碼安裝的,有二進制的,我下載的是二進制的,可以直接使用.這里介紹源碼安裝:
?
1.實驗環境：
??txzlkhdweb1??192.168.16.1??同步目錄?/root/test
??txzlkhdweb2??192.168.16.2??同步目錄?/root/test
?
2.創建共享文件目錄
txzlkhdweb1?:
[root@txzlkhdweb1?/]#?mkdir?/root/test
?
txzlkhdweb2:
[root@txzlkhdweb2?~]#?mkdir?/root/test
?
3.安裝Objective?Caml?compiler
Linux下從源碼包編譯安裝，需要一個叫做Objective?Caml?compiler的工具，版本至少3.0.7，可以從這里下載：http://caml.inria.fr/
[tomcat@txzlkhdweb1?~]$?cd?/usr/local/src/
[tomcat@txzlkhdweb1?~]$?wget?http://caml.inria.fr/pub/distrib/ocaml-3.12/ocaml-3.12.1.tar.gz?
--2013-05-03?20:23:02--??http://caml.inria.fr/pub/distrib/ocaml-3.12/ocaml-3.12.1.tar.gz
正在解析主機?caml.inria.fr...?128.93.11.35
Connecting?to?caml.inria.fr|128.93.11.35|:80...?已連接。
已發出?HTTP?請求，正在等待回應...?200?OK
長度：3660473?(3.5M)?[application/x-gzip]
Saving?to:?`ocaml-3.12.1.tar.gz'
?
100%[======================================>]?3,660,473????150K/s???in?44s?????
?
2013-05-03?20:23:49?(81.5?KB/s)?-?`ocaml-3.12.1.tar.gz'?saved?[3660473/3660473]
?
[root@txzlkhdweb1?src]#??tar?-zxf?ocaml-3.12.1.tar.gz?
[root@txzlkhdweb1?src]#?cd?ocaml-3.12.1?
[root@txzlkhdweb1?ocaml-3.12.1]#?./configure?
Configuring?for?a?x86_64-unknown-linux-gnu?...
gcc?found
........................................
????????options?for?linking?......?-lX11
The?"labltk"?library:?not?supported
?
**?Objective?Caml?configuration?completed?successfully?**
?
[root@txzlkhdweb1?ocaml-3.12.1]#?make?world?opt
make?coldstart
make[1]:?Entering?directory?`/usr/local/src/ocaml-3.12.1'
cd?byterun;?make?all
make[2]:?Entering?directory?`/usr/local/src/ocaml-3.12.1/byterun'
sed?-n?-e?'/^??/s/?\([A-Z]\)/?\&\&lbl_\1/gp'?\
???????????????-e?'/^}/q'?instruct.h?>?jumptbl.h
......................................................
../ocamlcompopt.sh?-nostdlib?-c?-g?-annot?-warn-error?A?-w?L?-w?R?-w?Z?-I?../otherlibs/unix?-I?ocamlbuild?-I?stdlib?-o?ocamlbuild/ocamlbuild_unix_plugin.cmx?ocamlbuild/ocamlbuild_unix_plugin.ml
../ocamlcompopt.sh?-nostdlib?-a?-I?stdlib?ocamlbuild/ocamlbuild_pack.cmx?ocamlbuild/ocamlbuild_plugin.cmx?ocamlbuild/ocamlbuild_executor.cmx?ocamlbuild/ocamlbuild_unix_plugin.cmx?-o?ocamlbuild/ocamlbuildlib.cmxa
../ocamlcompopt.sh?-nostdlib?-a?-I?stdlib?ocamlbuild/ocamlbuild_pack.cmx?ocamlbuild/ocamlbuild_plugin.cmx?-o?ocamlbuild/ocamlbuildlightlib.cmxa
make[1]:?Leaving?directory?`/usr/local/src/ocaml-3.12.1'
?
[root@txzlkhdweb1?ocaml-3.12.1]#?make?install
if?test?-d?/usr/local/bin;?then?:?;?else?mkdir?-p?/usr/local/bin;?fi
if?test?-d?/usr/local/lib/ocaml;?then?:?;?else?mkdir?-p?/usr/local/lib/ocaml;?fi
if?test?-d?/usr/local/lib/ocaml/stublibs;?then?:?;?else?mkdir?-p?/usr/local/lib/ocaml/stublibs;?fi
..................................
??install?/usr/local/lib/ocaml/ocamlbuild/ocamlbuild_executor.o
??install?/usr/local/lib/ocaml/ocamlbuild/ocamlbuild.cmo
??install?/usr/local/man/man1/ocamlbuild.1
?
4.編譯安裝Unison
[root@txzlkhdweb1?src]#?wget?http://www.seas.upenn.edu/~bcpierce/unison//download/releases/stable/unison-2.40.102.tar.gz
--2013-05-03?22:29:49--??http://www.seas.upenn.edu/~bcpierce/unison//download/releases/stable/unison-2.40.102.tar.gz
正在解析主機?www.seas.upenn.edu...?158.130.68.91,?2607:f470:8:64:5ea5::9
Connecting?to?www.seas.upenn.edu|158.130.68.91|:80...?已連接。
已發出?HTTP?請求，正在等待回應...?200?OK
長度：2694761?(2.6M)?[application/x-gzip]
Saving?to:?`unison-2.40.102.tar.gz'
?
100%[======================================================>]?2,694,761????113K/s???in?34s?????
?
2013-05-03?22:30:26?(76.8?KB/s)?-?`unison-2.40.102.tar.gz'?saved?[2694761/2694761]
?
[root@txzlkhdweb1?ocaml-3.12.1]#?make?install
if?test?-d?/usr/local/bin;?then?:?;?else?mkdir?-p?/usr/local/bin;?fi
if?test?-d?/usr/local/lib/ocaml;?then?:?;?else?mkdir?-p?/usr/local/lib/ocaml;?fi
............................
??install?/usr/local/lib/ocaml/ocamlbuild/ocamlbuild.cmo
??install?/usr/local/man/man1/ocamlbuild.1
?
[root@txzlkhdweb1?src]#?cd?unison-2.40.102
?
[root@txzlkhdweb1?unison-2.40.102]#?make?UISTYLE=text
ocamlc?-o?mkProjectInfo?unix.cma?str.cma?mkProjectInfo.ml
./mkProjectInfo?>?Makefile.ProjectInfo
UISTYLE?=?text
Building?for?Unix
NATIVE?=?true
THREADS?=?false
STATIC?=?false
OSTYPE?=
OSARCH?=
ocamlopt:?ubase/rx.mli?--->?ubase/rx.cmi
ocamlopt?-I?lwt?-I?ubase?-I?system?-I?system/generic?-I?lwt/generic?-c?/usr/local/src/unison-2.40.102/ubase/rx.mli
.........................................
make[1]:?Entering?directory?`/usr/local/src/unison-2.40.102'
if?[?-f?`which?etags`?];?then?\
????????????etags?*.mli?*/*.mli?*.ml?*/*.ml?*/*.m?*.c?*/*.c?*.txt?\
??????????;?fi?
make[1]:?Leaving?directory?`/usr/local/src/unison-2.40.102'
?
[root@txzlkhdweb1?unison-2.40.102]#?make?install
mv?/root/bin//unison?/tmp/unison-15209
mv:?無法?stat?“/root/bin//unison”:?沒有那個文件或目錄
make:?[doinstall]?錯誤?1?(忽略)
cp?unison?/root/bin/
cp:?無法創建一般文件“/root/bin/”:?是一個目錄
make:?***?[doinstall]?錯誤?1
#出現錯誤的原因在與Unison默認是將文件Copy到/root/bin目錄，但Linux默認是沒有該目錄的，因此我們需要將生成的可執行文件unison復制到系統的PATH目錄。
?
[root@txzlkhdweb1?unison-2.40.102]#?cp?unison?/usr/local/bin
?
5.通過SSH登陸到遠程主機txzlkhdweb2?，再將unison復制到slave的PATH目錄?
[root@txzlkhdweb1?unison-2.40.102]#?scp?unison?root@192.168.16.2:/usr/local/bin/unison
The?authenticity?of?host?'192.168.16.2?(192.168.16.2)'?can't?be?established.
RSA?key?fingerprint?is?7d:9a:b3:1b:c8:a4:85:de:dc:59:ac:ce:a3:8b:a7:41.
Are?you?sure?you?want?to?continue?connecting?(yes/no)??yes
Warning:?Permanently?added?'192.168.16.2'?(RSA)?to?the?list?of?known?hosts.
root@192.168.16.2s?password:?
unison????????????????????????????????????????100%?1473KB???1.4MB/s???00:00????
?
三．配置雙機ssh信任
由于unison在遠程同步文件夾要登陸遠程服務器,因此要配置兩機互相信任
本例假設本地機為：192.168.16.1(txzlkhdweb1)
??????????遠程機：192.168.16.2(txzlkhdweb2)
1.?在兩臺機器上創建?RSA密鑰?
以下操作要在本地機和遠程機上都執行一遍
???（1）以?root?用戶登錄?
???（2）在?root?用戶的?主目錄內創建.ssh?目錄并設置正確的權限?
[root@txzlkhdweb1?~]#?mkdir?~/.ssh
[root@txzlkhdweb1?~]#?chmod?700?~/.ssh
[root@txzlkhdweb1?~]#?ssh-keygen?-t?rsa
Generating?public/private?rsa?key?pair.
Enter?file?in?which?to?save?the?key?(/root/.ssh/id_rsa):?
Enter?passphrase?(empty?for?no?passphrase):?
Enter?same?passphrase?again:?
Your?identification?has?been?saved?in?/root/.ssh/id_rsa.
Your?public?key?has?been?saved?in?/root/.ssh/id_rsa.pub.
The?key?fingerprint?is:
20:4e:83:71:d4:12:e1:b1:a3:d0:fe:b1:8e:9e:ed:a8?root@txzlkhdweb1?
[root@txzlkhdweb1?~]#?ssh?192.168.16.1cat?/root/.ssh/id_rsa.pub?>>?authorized_keys
The?authenticity?of?host?'192.168.16.1(192.168.16.1)'?can't?be?established.
RSA?key?fingerprint?is?7d:9a:b3:1b:c8:a4:85:de:dc:59:ac:ce:a3:8b:a7:41.
Are?you?sure?you?want?to?continue?connecting?(yes/no)??yes
Warning:?Permanently?added?'192.168.16.1(RSA)?to?the?list?of?known?hosts.
root@192.168.16.1's?password:?
[root@txzlkhdweb1?~]#?ssh?192.168.16.2cat?/root/.ssh/id_rsa.pub?>>?authorized_keys?
root@192.168.16.2s?password:?
[root@txzlkhdweb1?~]#?scp?authorized_keys?192.168.16.2:/root/.ssh/?
root@192.168.16.2's?password:?
authorized_keys???????????????????????????????100%??785?????0.8KB/s???00:00????
#重啟兩臺服務器的SSH服務?
[root@txzlkhdweb1?~]#?/etc/init.d/sshd?restart?
[root@txzlkhdweb2~]#?/etc/init.d/sshd?restart??
?
四．unison的使用
1.unison遠程使用
使用方法：
#?unison?<本地目錄>?ssh://remotehostname(IP)/<遠程目錄的絕對路徑>
例如:
[root@txzlkhdweb1?~]#?/usr/local/bin/unison?/root/test?ssh://root@192.168.16.1//root/test
Contacting?server...
Connected?[//txzlkhdweb1//root/test?->?//txzlkhdweb2//root/test]
Looking?for?changes
??Waiting?for?changes?from?server
Reconciling?changes
Nothing?to?do:?replicas?have?not?changed?since?last?sync.
?
表示將本機的目錄/txzlkhdweb1/root/test和遠端主機的/txzlkhdweb2/root/test進行同步。一般的，需要兩臺機能ssh連接。
注意?在主機和目錄間又多加了一個?"/"
?
2.修改參數說明
[root@txzlkhdweb1?.unison]#?vim?~/.unison/default.prf??
#!/bin/bash
#?this?script?is?created?by?yourname.
#?Unison?preferences?file?
#root?=?/root/test?
#root?=?ssh://root@192.168.16.2//root/test
#force?=?
#ignore?=?
batch?=?true
#repeat?=?1?
#retry?=?3?
owner?=?true
group?=?true
perms?=?-1
fastcheck?=?false
rsync?=?false
sshargs?=?-C
xferbycopying?=?true
log?=?true
logfile?=?/root/.unison/unison.log?
?
如果服務器端?unison?可執行文件不在默認目錄下，甚至沒有?unison?命令（需要你編譯一個上傳到服務器），則需要使用?-servercmd?參數告訴要執行的服務器?unison?命令位置。?
使用?-testserver?參數，則成功鏈接即退出，也不會去執行目錄的比較等后續操作。?
??-servercmd?xxx?
告訴?unison，?服務器端的?unison?命令是什么。參見上面的示例。?
??-auto?
接受缺省的動作，然后等待用戶確認是否執行。?
??-batch?
batch?mode,?全自動模式，接受缺省動作，并執行。?
??-ignore?xxx?
增加?xxx?到忽略列表中?
??-ignorecase?[true|false|default]?
是否忽略文件名大小寫?
??-follow?xxx?
是否支持對符號連接指向內容的同步
??owner?=?true?(保持同步過來的文件屬主)
??group?=?true?(保持同步過來的文件組信息)
??perms?=?-1???(保持同步過來的文件讀寫權限)
??repeat?=?1???(間隔1秒后,開始新的一次同步檢查)
??retry?=?3????(失敗重試)
??sshargs?=?-C?(使用ssh的壓縮傳輸方式)
??xferbycopying?=?true
??-immutable?xxx?
不變目錄，掃描時可以忽略?
??-silent?
安靜模式?
??-times?
同步修改時間?
??-path?xxx?參數?
只同步?-path?參數指定的子目錄以及文件，而非整個目錄。-path?可以多次出現,例如?
??unison?/home/username?ssh://remotehost//home/username?\
?-path?shared?\
?-path?pub?\
?-path?.netscape/bookmarks.html
?
五．安裝inotify?軟件
1.查看當前系統是否支持inotify
[root@txzlkhdweb1?test]#?ls?-l?/proc/sys/fs/inotify
總計?0
-rw-r--r--?1?root?root?0?05-04?00:56?max_queued_events
-rw-r--r--?1?root?root?0?05-04?00:56?max_user_instances
-rw-r--r--?1?root?root?0?05-04?00:56?max_user_watches
2.下載inotify?源碼包
[root@txzlkhdweb1?~]#?wget?https://github.com/downloads/rvoicilas/inotify-tools/inotify-tools-3.14.tar.gz
正在解析主機?github.com...?192.30.252.129
Connecting?to?github.com|192.30.252.129|:443...?已連接。
WARNING:?cannot?verify?github.com's?certificate,?issued?by?`/C=US/O=DigiCert?Inc/OU=www.digicert.com/CN=DigiCert?High?Assurance?EV?CA-1':
??Issued?certificate?not?yet?valid.
已發出?HTTP?請求，正在等待回應...?302?Found
位置：http://cloud.github.com/downloads/rvoicilas/inotify-tools/inotify-tools-3.14.tar.gz?[跟隨至新的?URL]
--2013-05-04?01:23:55--??http://cloud.github.com/downloads/rvoicilas/inotify-tools/inotify-tools-3.14.tar.gz
正在解析主機?cloud.github.com...?54.240.164.110,?54.230.113.195,?54.240.164.29,?...
Connecting?to?cloud.github.com|54.240.164.110|:80...?已連接。
已發出?HTTP?請求，正在等待回應...?200?OK
長度：358772?(350K)?[null]
Saving?to:?`inotify-tools-3.14.tar.gz'
?
100%[=================================================>]?358,772??????356K/s???in?1.0s????
?
2013-05-04?01:23:56?(356?KB/s)?-?`inotify-tools-3.14.tar.gz'?saved?[358772/358772]
3.編譯安裝inotify
[root@txzlkhdweb1?~]#?tar?zxf?inotify-tools-3.14.tar.gz
[root@txzlkhdweb1?~]#?cd?inotify-tools-3.14
[root@txzlkhdweb1?inotify-tools-3.14]#?make?&&?make?install
make??all-recursive
make[1]:?Entering?directory?`/root/inotify-tools-3.14'
.......
make[2]:?Nothing?to?be?done?for?`install-data-am'.
make[2]:?Leaving?directory?`/root/inotify-tools-3.14'
make[1]:?Leaving?directory?`/root/inotify-tools-3.14'
4.編寫inotify?實時監控腳本
[root@txzlkhdweb1?inotify-tools-3.14]#?cat?/proc/sys/fs/inotify/max_user_watches
5000000000
[root@txzlkhdweb1?inotify-tools-3.14]#?cat?/proc/sys/fs/inotify/max_queued_events
327679
#事件監控腳本：
[root@txzlkhdweb1?inotify-tools-3.14]#?vim?/usr/local/inotify/unison.sh
#!/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
LOCAL_DIR="/root/test/"
REMOTE_DIR="/root/test/"
REMOTE_USER="root"
INOTIFY="/usr/local/inotify-tools-3.14/bin/inotifywait"
UNISION="/usr/local/bin/unison"
#目前iplist.txt?文件中就一個地址?192.168.16.2
IP_LIST_FILE="/usr/local/inotify/iplist.txt"
ATTRIBUTES="modify,delete,create,attrib"
?
${INOTIFY}?-mrq?--timefmt?'%d/%m/%y?%H:%M'?--format?'%T?%w%f'?-e?${ATTRIBUTES}?${LOCAL_DIR}?|?while?read?files?
do
????????for?IPADDR?in?`sed?'/^$/d'?${IP_LIST_FILE}`
????????do
??????????????????${UNISION}?common?"${LOCAL_DIR}"?"ssh://${REMOTE_USER}@${IPADDR}/${REMOTE_DIR}"
????????done
Done
?
[root@txzlkhdweb1?inotify-tools-3.14]#?chmod?+x?/usr/local/inotify/unison.sh
[root@txzlkhdweb1?inotify-tools-3.14]#?cd?/usr/local/inotify
?
5.在txzlkhdweb2?上安裝同樣的inotify工具，步驟同上，此處省略
6.編寫同步腳本
[root@txzlkhdweb2?inotify-tools-3.14]#?cat?/proc/sys/fs/inotify/max_user_watches
5000000000
[root@txzlkhdweb2?inotify-tools-3.14]#?cat?/proc/sys/fs/inotify/max_queued_events
327679
#事件監控腳本：
[root@txzlkhdweb2?inotify-tools-3.14]#?vim?/usr/local/inotify/unison.sh
#!/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
LOCAL_DIR="/root/test/"
REMOTE_DIR="/root/test/"
REMOTE_USER="root"
INOTIFY="/usr/local/inotify-tools-3.14/bin/inotifywait"
UNISION="/usr/local/bin/unison"
#目前iplist.txt?文件中就一個地址?192.168.16.1
IP_LIST_FILE="/usr/local/inotify/iplist.txt"
ATTRIBUTES="modify,delete,create,attrib"
?
${INOTIFY}?-mrq?--timefmt?'%d/%m/%y?%H:%M'?--format?'%T?%w%f'?-e?${ATTRIBUTES}?${LOCAL_DIR}?|?while?read?files?
do
????????for?IPADDR?in?`sed?'/^$/d'?${IP_LIST_FILE}`
????????do
??????????????????${UNISION}?common?"${LOCAL_DIR}"?"ssh://${REMOTE_USER}@${IPADDR}/${REMOTE_DIR}"
????????done
Done
?
[root@txzlkhdweb2?inotify-tools-3.14]#?chmod?+x?/usr/local/inotify/unison.sh
[root@txzlkhdweb2?inotify-tools-3.14]#?cd?/usr/local/inotify
[root@txzlkhdweb2?inotify-tools-3.14]#?nohup?./unison.sh?&
7.?執行inotify?監控腳本
[root@txzlkhdweb1?inotify-tools-3.14]#?nohup?./unison.sh?&
?
[root@txzlkhdweb2?inotify-tools-3.14]#?nohup?./unison.sh?&
8.?查看命令腳本執行程序是否在執行
[root@txzlkhdweb1?~]#?ps?-ef?|?grep?inotify
root?????31194?31193??0?May18?pts/0????00:00:00?/usr/local/inotify-tools-3.14/bin/inotifywait?-mrq?--timefmt?%d/%m/%y?%H:%M?--format?%T?%w%f?-e?modify,delete,create,attrib?/root/test/
root?????31469?24614??0?01:36?pts/0????00:00:00?grep?inotify
?
9.?手工創建文件測試
[root@txzlkhdweb1?~]#?touch?/root/test/f1.txt
[root@txzlkhdweb1?~]#?Contacting?server...
Contacting?server...
Connected?[//txzlkhdweb1?//root/test?->?//txzlkhdweb2//root/test]
Connected?[//txzlkhdweb1?//root/test?->?//txzlkhdweb2?//root/test]
Looking?for?changes
??Waiting?for?changes?from?server
Reconciling?changes
new?file?---->????????????f1.txt??
local????????:?new?file???????????modified?on?2013-05-19?at??0:22:58??size?0?????????--rw-r--r--?user=0?group=0
slave????????:?absent
Propagating?updates
UNISON?2.40.102?started?propagating?changes?at?00:22:59.08?on?19?May?2013
[BGN]?Copying?f1.txt?from?/root/test?to?//txzlkhdweb2//root/test
Looking?for?changes
??Waiting?for?changes?from?server
Shortcut:?copied?/root/test/f1.txt?from?local?file?/root/test/www.prf
[END]?Copying?f1.txt
UNISON?2.40.102?finished?propagating?changes?at?00:22:59.09?on?19?May?2013
Saving?synchronizer?state
Synchronization?complete?at?00:22:59??(1?item?transferred,?0?skipped,?0?failed)
Contacting?server...
Connected?[//txzlkhdweb1//root/test?->?//txzlkhdweb2//root/test]
Looking?for?changes
??Waiting?for?changes?from?server
Reconciling?changes
new?file?---->????????????f1.txt??
local????????:?new?file???????????modified?on?2013-05-19?at??0:22:58??size?0?????????--rw-r--r--?user=0?group=0
slave????????:?absent
Propagating?updates
UNISON?2.40.102?started?propagating?changes?at?00:23:00.09?on?19?May?2013
[BGN]?Copying?f1.txt?from?/root/test?to?//txzlkhdweb2//root/test
Shortcut:?copied?/root/test/f1.txt?from?local?file?/root/test/www.prf
Failed:?Destination?updated?during?synchronization
The?file?f1.txt?has?been?created
?
100%??00:00?ETAFailed?[f1.txt]:?Destination?updated?during?synchronization
The?file?f1.txt?has?been?created
?
UNISON?2.40.102?finished?propagating?changes?at?00:23:00.09?on?19?May?2013
Saving?synchronizer?state
Synchronization?incomplete?at?00:23:00??(0?items?transferred,?0?skipped,?1?failed)
??failed:?f1.txt
#這里同步多次問題暫時不知道如何解決，希望高手指點
Contacting?server...
Connected?[//txzlkhdweb1//root/test?->?//txzlkhdweb2//root/test]
Reconciling?changes
Nothing?to?do:?replicas?have?not?changed?since?last?sync.
Looking?for?changes
??Waiting?for?changes?from?server
Reconciling?changes
Nothing?to?do:?replicas?have?been?changed?only?in?identical?ways?since?last?sync.
?
參考網址：
http://ixdba.blog.51cto.com/2895551/584334
http://sofar.blog.51cto.com/353572/1271608
?
?
?
來自為知筆記(Wiz)
轉載于:https://www.cnblogs.com/djinmusic/p/3357591.html
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