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40 lines
1.5 KiB
Markdown
40 lines
1.5 KiB
Markdown
---
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title: 'Tutorials | Docker Build'
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---
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## Building your own Docker image
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### Submodules
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You'll need to retrieve the git submodules prior to building your own Docker image. From within your copy of the git repo run the following to retrieve the submodules and build the Docker image:
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```sh
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git submodule update --init --recursive
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docker build -t <YOUR CUSTOM IMAGE NAME> .
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```
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Or, you can clone and retrieve the submodules in one command:
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```sh
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git clone --recurse-submodules https://github.com/docker-mailserver/docker-mailserver
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```
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### About Docker
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#### Version
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We make use of build-features that require a recent version of Docker. Depending on your distribution, please have a look at [the official installation documentation for Docker](https://docs.docker.com/engine/install/) to get the latest version. Otherwise, you may encounter issues, for example with the `--link` flag for a [`#!dockerfile COPY`](https://docs.docker.com/engine/reference/builder/#copy) command.
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#### Environment
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If you are not using `make` to build the image, note that you will need to provide `DOCKER_BUILDKIT=1` to the `docker build` command for the build to succeed.
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#### Build Arguments
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The `Dockerfile` takes additional, so-called build arguments. These are
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1. `VCS_VERSION`: the image version (default = edge)
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2. `VCS_REVISION`: the image revision (default = unknown)
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When using `make` to build the image, these are filled with proper values. You can build the image without supplying these arguments just fine though.
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