Overwrite existing Docker image

Overwrite existing Docker image

This section is all about customizing the Devilbox and its Docker images specifically to your needs.

Prerequisites

The new Docker image overwrite will be added to a file called docker-compose.override.yml. So before going any further, read the following section that shows you how to create this file for the Devilbox as well as what pitfalls to watch out for.

docker-compose-override-yml

What information do you need?

1. The service to overwrite

How to overwrite a service?

Generic steps

1. Copy the whole service definition from docker-compose.yml to docker-compose.override.yml
2. Remove anything unecessary
3. Adjust the values you need

Overwrite Docker image for the bind service

The following example is using the bind service and overrides the Docker image to illustrate how this is done :

First you simply copy the while definition of the bind service from docker-compose.yml to docker-compose.override.yml:

version: '2.1'
services:
  bind:
    image: cytopia/bind:0.11
    restart: always
    ports:
      # [local-machine:]local-port:docker-port
      - "${LOCAL_LISTEN_ADDR}${HOST_PORT_BIND:-1053}:53"
      - "${LOCAL_LISTEN_ADDR}${HOST_PORT_BIND:-1053}:53/udp"

    environment:
      ##
      ## Debug?
      ##
      - DEBUG_ENTRYPOINT=${DEBUG_ENTRYPOINT}
      - DOCKER_LOGS=1

      ##
      ## Bind settings
      ##
      - WILDCARD_ADDRESS=172.16.238.11
      - DNS_FORWARDER=${BIND_DNS_RESOLVER:-8.8.8.8,8.8.4.4}

    dns:
      - 127.0.0.1

    networks:
      app_net:
        ipv4_address: 172.16.238.100

The second step is to remove everything that you do not need to overwrite:

version: '2.1'
services:
  bind:
    image: cytopia/bind:0.11

The last step is to actually adjust the value you want to change for the bind service:

version: '2.1'
services:
  bind:
    image: someother/bind:latest

Further reading

* docker-compose-override-yml * add-your-own-docker-image