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112 lines
2.6 KiB
ReStructuredText
112 lines
2.6 KiB
ReStructuredText
.. _overwrite_existing_docker_image:
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*******************************
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Overwrite existing Docker image
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*******************************
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This section is all about customizing the Devilbox and its Docker images specifically to your needs.
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**Table of Contents**
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.. contents:: :local:
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Prerequisites
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=============
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The new Docker image overwrite will be added to a file called ``docker-compose.override.yml``.
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So before going any further, read the following section that shows you how to create this file
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for the Devilbox as well as what pitfalls to watch out for.
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.. seealso:: :ref:`docker_compose_override_yml`
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What information do you need?
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=============================
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1. The service to overwrite
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How to overwrite a service?
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===========================
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Generic steps
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-------------
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1. Copy the whole service definition from docker-compose.yml to docker-compose.override.yml
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2. Remove anything unecessary
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3. Adjust the values you need
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Overwrite Docker image for the bind service
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-------------------------------------------
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The following example is using the ``bind`` service and overrides the Docker image
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to illustrate how this is done :
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First you simply copy the while definition of the bind service from ``docker-compose.yml`` to
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``docker-compose.override.yml``:
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.. code-block:: yaml
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:caption: docker-compose.override.yml
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version: '2.1'
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services:
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bind:
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image: cytopia/bind:0.11
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restart: always
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ports:
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# [local-machine:]local-port:docker-port
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- "${LOCAL_LISTEN_ADDR}${HOST_PORT_BIND:-1053}:53"
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- "${LOCAL_LISTEN_ADDR}${HOST_PORT_BIND:-1053}:53/udp"
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environment:
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##
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## Debug?
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##
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- DEBUG_ENTRYPOINT=${DEBUG_COMPOSE_ENTRYPOINT}
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- DOCKER_LOGS=1
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##
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## Bind settings
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##
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- WILDCARD_ADDRESS=172.16.238.11
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- DNS_FORWARDER=${BIND_DNS_RESOLVER:-8.8.8.8,8.8.4.4}
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dns:
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- 127.0.0.1
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networks:
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app_net:
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ipv4_address: 172.16.238.100
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The second step is to remove everything that you do not need to overwrite:
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.. code-block:: yaml
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:caption: docker-compose.override.yml
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version: '2.1'
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services:
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bind:
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image: cytopia/bind:0.11
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The last step is to actually adjust the value you want to change for the bind service:
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.. code-block:: yaml
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:caption: docker-compose.override.yml
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:emphasize-lines: 4
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version: '2.1'
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services:
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bind:
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image: someother/bind:latest
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Further reading
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===============
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.. seealso::
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* :ref:`docker_compose_override_yml`
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* :ref:`add_your_own_docker_image`
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