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[docker] dangling image (<none>:<none>) ¿Í intermediate image ¿¡ °üÇÏ¿©...

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2017-06-28 17:32:32
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°ü·Ã¸µÅ©01
http://www.projectatomic.io/blog/2015/07/what-are-docker-none-none-images/ 
°ü·Ã¸µÅ©02
http://docs.docker.com/engine/userguide/storagedriver/imagesandcontainers/#images-and-layers 
 Img #1 : container layers

 Img #2 : sharing layers

¡Ü ÁÁÀº : À̹ÌÁö - intermediate image
docker filesystem Àº layer ·Î ±¸¼ºµÇ¾î ÀÖ°í, °¢°¢ÀÇ ·¹À̾î´Â ¼­·Î¸¦ ÂüÁ¶ÇÏ°Ô²û ¼³°èµÇ¾î ÀÖ´Ù.
docker images -a ¿É¼ÇÀ¸·Î¸¸ º¼ ¼ö ÀÖÀ½.

¡Ü ³ª»Û : À̹ÌÁö - dangling image
java ³ª go ¾ð¾î¿Í °°ÀÌ ÂüÁ¶µÇÁö ¾Ê´Â ¸Þ¸ð¸® ¿µ¿ªÀ¸·Î µð½ºÅ© °ø°£¸¸ Â÷ÁöÇϱ⠶§¹®¿¡ ÁÖ±âÀûÀ¸·Î Á¤¸®ÇØÁÖ¾î¾ß ÇÑ´Ù.
(À§ ¾ð¾îµéÀº °¡ºñÁö Ä÷º¼ÇÀ» ÅëÇØ ÂüÁ¶µÇÁö ¾Ê´Â ¿µ¿ªÀ» ¹ÝȯÇÏ°Ô µÈ´Ù)

docker images -a ¿É¼ÇÀ¸·Î¸¸ º¼¼ö ÀÖ¾ú´ø intermediate image ¿Í´Â ´Þ¸®
docker images ¸í·ÉÀ¸·Îµµ º¼¼ö ÀÖ´Ù.

ÀÌ·¯ÇÑ dangling image µéÀº docker pull, docker build ¸í·ÉÀÇ °á°ú·Î 
docker images ¸í·ÉÀ¸·Î º¸ÀÌ´Â : À̹ÌÁö°¡ ÀÖ´Â °æ¿ì ¾Æ·¡ ¸í·ÉÀ¸·Î Á¤¸®ÇØÁÖ¾î¾ß ÇÑ´Ù.
docker rmi $(docker images -f "dangling=true" -q)
¾ÆÁ÷±îÁø µµÄ¿¿¡ ÀÚµ¿È­µÈ °¡ºñÁö Ä÷º¼Ç ±â´ÉÀº ¾ø´Ù. µû¶ó¼­ À§¿Í °°ÀÌ ¼öµ¿À¸·Î¸¸ ÇØÁÖ¾î¾ß ÇÑ´Ù.
....
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ÇöÀç´Â docker image prune ¸í·ÉÀ¸·Î "dangling À̹ÌÁö" ³ª "¹Ì»ç¿ë À̹ÌÁö" µéÀ» Á¦°ÅÇÒ ¼ö ÀÖ´Ù.
https://docs.docker.com/engine/reference/commandline/image_prune/

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