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Docker COPY command
The docker COPY command can be used to copy the files or directories from the Docker host to the image file system.
Docker COPY command Syntax
COPY <src> <dst> <src>: Source directory/file <dst>: Destination directory/file |
<src> can be either file or can be directory.
COPY sources/config.xml app.xml | # Copy file config.xml and rename it to app.xml |
COPY sources /sources/ | # Copy all contents from sources directory to sources directory in image |
If <dst> not starts with / then it is considered as absolute path.
If <dst> starts with / then it is considered as relative path to the work directory.
If <dst> ends with / the it is considered as directory.
If <dst> does not ends with / the it is considered as file. A file without any extension will be created.
COPY sources/config.xml config.xml | # Copy file sources/config.xml to root/config.xml |
COPY sources/config.xml /config.xml | # Copy file sources/config.xml to /<workdirectory>/config.xml |
COPY sources/config.xml config.xml/
| # Copy file sources/config.xml to root/config.xml/config.xml. Note that a directory with name config.xml is also created and inside this file config.xml is created. |
COPY sources/config.xml config | # Copy file sources/config.xml to root/config, a file without extension. |
<src> not necessary to start with / and always considered as relative to the directory where dockerfile is located. If your docker file is located in C:/docker/test/dockerfile then for the command “COPY sources/config.xml app.xml” config.xml is located from C:/docker/test/sources/config.xml
sources, /sources, sources/, /sources/ these all are considered to be same sources directory.
<src> is considered as file only if it has file extension.
<src> can have multiple files. You can specify multiple files either directly or through wildcards. When <src> has multiple files then <dst> should be directory.
<src> is directory then <dst> should be directory.
COPY sources/config.xml sources/build.xml config/ | # Copy file sources/config.xml and sources/build.xml to root/config directory. <dst> should end with / to consider it as directory |
COPY sources/config.xml sources/build.xml config | # Error <dst> should be directory. <dst> does not end with / hence it is considered as file. |
COPY sources/*.xml sources/build.xml config/ | # Copy all file with xml extension to root/config directory. |
COPY sources/config?.xml config/ | # ? is replaced with any single character, e.g., config1.xml, config2.xml, configZ.xml, config#.xml |
COPY sources/config??.xml config/ | # ?? is replaced with any two character, e.g., config11.xml, config32.xml, configZZ.xml, config$#.xml |
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