mirror of https://github.com/docker/cli.git
Makes headings in documentation consistent
Fixes #10673. Signed-off-by: Rick Wieman <git@rickw.nl>
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page_title: Dockerfile Reference
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page_title: Dockerfile reference
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page_description: Dockerfiles use a simple DSL which allows you to automate the steps you would normally manually take to create an image.
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page_description: Dockerfiles use a simple DSL which allows you to automate the steps you would normally manually take to create an image.
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page_keywords: builder, docker, Dockerfile, automation, image creation
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page_keywords: builder, docker, Dockerfile, automation, image creation
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# Dockerfile Reference
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# Dockerfile reference
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**Docker can build images automatically** by reading the instructions
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**Docker can build images automatically** by reading the instructions
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from a `Dockerfile`. A `Dockerfile` is a text document that contains all
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from a `Dockerfile`. A `Dockerfile` is a text document that contains all
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@ -105,7 +105,7 @@ be treated as an argument. This allows statements like:
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Here is the set of instructions you can use in a `Dockerfile` for building
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Here is the set of instructions you can use in a `Dockerfile` for building
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images.
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images.
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### Environment Replacement
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### Environment replacement
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> **Note**: prior to 1.3, `Dockerfile` environment variables were handled
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> **Note**: prior to 1.3, `Dockerfile` environment variables were handled
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> similarly, in that they would be replaced as described below. However, there
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> similarly, in that they would be replaced as described below. However, there
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@ -288,7 +288,7 @@ guide](/articles/dockerfile_best-practices/#build-cache) for more information.
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The cache for `RUN` instructions can be invalidated by `ADD` instructions. See
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The cache for `RUN` instructions can be invalidated by `ADD` instructions. See
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[below](#add) for details.
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[below](#add) for details.
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### Known Issues (RUN)
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### Known issues (RUN)
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- [Issue 783](https://github.com/docker/docker/issues/783) is about file
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- [Issue 783](https://github.com/docker/docker/issues/783) is about file
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permissions problems that can occur when using the AUFS file system. You
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permissions problems that can occur when using the AUFS file system. You
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@ -973,7 +973,7 @@ For example you might add something like this:
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> **Warning**: The `ONBUILD` instruction may not trigger `FROM` or `MAINTAINER` instructions.
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> **Warning**: The `ONBUILD` instruction may not trigger `FROM` or `MAINTAINER` instructions.
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## Dockerfile Examples
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## Dockerfile examples
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# Nginx
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# Nginx
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#
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#
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@ -24,7 +24,7 @@ the `docker` command, your system administrator can create a Unix group called
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For more information about installing Docker or `sudo` configuration, refer to
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For more information about installing Docker or `sudo` configuration, refer to
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the [installation](/installation) instructions for your operating system.
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the [installation](/installation) instructions for your operating system.
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## Environment Variables
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## Environment variables
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For easy reference, the following list of environment variables are supported
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For easy reference, the following list of environment variables are supported
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by the `docker` command line:
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by the `docker` command line:
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@ -48,7 +48,7 @@ These Go environment variables are case-insensitive. See the
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[Go specification](http://golang.org/pkg/net/http/) for details on these
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[Go specification](http://golang.org/pkg/net/http/) for details on these
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variables.
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variables.
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## Configuration Files
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## Configuration files
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The Docker command line stores its configuration files in a directory called
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The Docker command line stores its configuration files in a directory called
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`.docker` within your `HOME` directory. Docker manages most of the files in
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`.docker` within your `HOME` directory. Docker manages most of the files in
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@ -2210,7 +2210,7 @@ application change:
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`--rm` option means that when the container exits, the container's layer is
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`--rm` option means that when the container exits, the container's layer is
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removed.
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removed.
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#### Restart Policies
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#### Restart policies
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Use Docker's `--restart` to specify a container's *restart policy*. A restart
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Use Docker's `--restart` to specify a container's *restart policy*. A restart
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policy controls whether the Docker daemon restarts a container after exit.
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policy controls whether the Docker daemon restarts a container after exit.
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@ -156,7 +156,7 @@ Images using the v2 or later image format have a content-addressable identifier
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called a digest. As long as the input used to generate the image is unchanged,
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called a digest. As long as the input used to generate the image is unchanged,
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the digest value is predictable and referenceable.
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the digest value is predictable and referenceable.
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## PID Settings (--pid)
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## PID settings (--pid)
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--pid="" : Set the PID (Process) Namespace mode for the container,
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--pid="" : Set the PID (Process) Namespace mode for the container,
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'host': use the host's PID namespace inside the container
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'host': use the host's PID namespace inside the container
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@ -177,7 +177,7 @@ within the container.
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This command would allow you to use `strace` inside the container on pid 1234 on
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This command would allow you to use `strace` inside the container on pid 1234 on
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the host.
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the host.
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## IPC Settings (--ipc)
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## IPC settings (--ipc)
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--ipc="" : Set the IPC mode for the container,
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--ipc="" : Set the IPC mode for the container,
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'container:<name|id>': reuses another container's IPC namespace
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'container:<name|id>': reuses another container's IPC namespace
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