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Diffstat (limited to 'docs/sources/reference/builder.md')
| -rw-r--r-- | docs/sources/reference/builder.md | 53 |
1 files changed, 45 insertions, 8 deletions
diff --git a/docs/sources/reference/builder.md b/docs/sources/reference/builder.md index 8717eb7bfc..91190933c9 100644 --- a/docs/sources/reference/builder.md +++ b/docs/sources/reference/builder.md @@ -15,7 +15,7 @@ To [*build*](../commandline/cli/#cli-build) an image from a source repository, create a description file called Dockerfile at the root of your repository. This file will describe the steps to assemble the image. -Then call `docker build` with the path of you source repository as argument +Then call `docker build` with the path of your source repository as the argument (for example, `.`): $ sudo docker build . @@ -83,6 +83,38 @@ be treated as an argument. This allows statements like: Here is the set of instructions you can use in a Dockerfile for building images. +## .dockerignore + +If a file named `.dockerignore` exists in the source repository, then it +is interpreted as a newline-separated list of exclusion patterns. +Exclusion patterns match files or directories relative to the source repository +that will be excluded from the context. Globbing is done using Go's +[filepath.Match](http://golang.org/pkg/path/filepath#Match) rules. + +The following example shows the use of the `.dockerignore` file to exclude the +`.git` directory from the context. Its effect can be seen in the changed size of +the uploaded context. + + $ docker build . + Uploading context 18.829 MB + Uploading context + Step 0 : FROM busybox + ---> 769b9341d937 + Step 1 : CMD echo Hello World + ---> Using cache + ---> 99cc1ad10469 + Successfully built 99cc1ad10469 + $ echo ".git" > .dockerignore + $ docker build . + Uploading context 6.76 MB + Uploading context + Step 0 : FROM busybox + ---> 769b9341d937 + Step 1 : CMD echo Hello World + ---> Using cache + ---> 99cc1ad10469 + Successfully built 99cc1ad10469 + ## FROM FROM <image> @@ -238,14 +270,19 @@ All new files and directories are created with a uid and gid of 0. In the case where `<src>` is a remote file URL, the destination will have permissions 600. > **Note**: -> If you build using STDIN (`docker build - < somefile`), there is no -> build context, so the Dockerfile can only contain an URL based ADD -> statement. - +> If you build by passing a Dockerfile through STDIN (`docker build - < somefile`), +> there is no build context, so the Dockerfile can only contain a URL +> based ADD statement. + +> You can also pass a compressed archive through STDIN: +> (`docker build - < archive.tar.gz`), the `Dockerfile` at the root of +> the archive and the rest of the archive will get used at the context +> of the build. +> > **Note**: > If your URL files are protected using authentication, you will need to -> use an `RUN wget` , `RUN curl` -> or other tool from within the container as ADD does not support +> use `RUN wget` , `RUN curl` +> or use another tool from within the container as ADD does not support > authentication. The copy obeys the following rules: @@ -361,7 +398,7 @@ execute in `/bin/sh -c`: FROM ubuntu ENTRYPOINT wc -l - -For example, that Dockerfile's image will *always* take stdin as input +For example, that Dockerfile's image will *always* take STDIN as input ("-") and print the number of lines ("-l"). If you wanted to make this optional but default, you could use a CMD: |