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Merge pull request #14725 from charleswhchan/issue-14433 

Issue #14433
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moxiegirl 2015-07-21 07:48:54 -07:00
parent a7d61882c0 08d5424c04
commit 1ca737875d
1 changed files with 6 additions and 6 deletions
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docs/articles/dockerfile_best-practices.md
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@ -105,12 +105,12 @@ not, the cache is invalidated.
of the child images is sufficient. However, certain instructions require of the child images is sufficient. However, certain instructions require
a little more examination and explanation. a little more examination and explanation.
* In the case of the `ADD` and `COPY` instructions, the contents of the file(s) * For the `ADD` and `COPY` instructions, the contents of the file(s)
being put into the image are examined. Specifically, a checksum is done in the image are examined and a checksum is calculated for each file.
of the file(s) and then that checksum is used during the cache lookup. The last-modified and last-accessed times of the file(s) are not considered in
If anything has changed in the file(s), including its metadata, these checksums. During the cache lookup, the checksum is compared against the
then the cache is invalidated. The last-modified and last-accessed times of the checksum in the existing images. If anything has changed in the file(s), such
file(s) are not considered in these checksums. as the contents and metadata, then the cache is invalidated.
* Aside from the `ADD` and `COPY` commands cache checking will not look at the * Aside from the `ADD` and `COPY` commands cache checking will not look at the
files in the container to determine a cache match. For example, when processing files in the container to determine a cache match. For example, when processing