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文件: /usr/share/doc/cloud-init/examples/include-once.txt
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#include-once # entries are one url per line. comment lines beginning with '#' are allowed # urls are passed to urllib.urlopen, so the format must be supported there # This entries will just be processed ONE TIME by cloud-init, any further # iterations won't process this file http://www.ubuntu.com/robots.txt http://www.w3schools.com/html/lastpage.htm
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