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Customizing Docker Images

It's common to have a requirement for the web or db images which is not bundled in them by default. Thre are two easy ways to extend these docker images:

  • webimage_extra_packages and dbimage_extra_packages in .ddev/config.yaml
  • An add-on Dockerfile in your project's .ddev/web-build or .ddev/db-build

Adding extra Debian packages with webimage_extra_packages and dbimage_extra_packages

You can add extra Debian packages if that's all that is needed with lines like this in .ddev/config.yaml:

webimage_extra_packages: [php-yaml, php7.3-ldap]
dbimage_extra_packages: [telnet, netcat]

Then the additional packages will be built into the containers during ddev start

Adding extra Dockerfiles for webimage and dbimage

For more complex requirements, you can add .ddev/web-build/Dockerfile or .ddev/db-build/Dockerfile.

Examples of possible Dockerfiles are given in .ddev/web-build/Dockerfile.example and .ddev/db-build/Dockerfile.example (These examples are created in your project when you ddev config the project.)

An example web image .ddev/web-build/Dockerfile might be:

ARG BASE_IMAGE=drud/ddev-webserver:20190422_blackfire_io
FROM $BASE_IMAGE
RUN npm install --global gulp-cli

Note that if a Dockerfile is provided, any config.yaml webimage_extra_packages or dbimage_extra_packages will be ignored.

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