I was asked a question around how to change the theme in the Keycloak docker image and I had never tried it. So it was worth a blog. First pull the original image
docker pull jboss/keycloak Then start the image
# Get the image docker images REPOSITORY TAG IMAGE ID CREATED SIZE jboss/keycloak latest d9fadb38a379 10 days ago 739MB # Then start the image with your username and password docker run -p 8080:8080 -e KEYCLOAK_USER=admin -e KEYCLOAK_PASSWORD=admin jboss/keycloak # Get the container id docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 47dd5c82b073 jboss/keycloak "/opt/jboss/tools/do…" 18 minutes ago Up 4 minutes 0.0.0.0:8080->8080/tcp, 8443/tcp angry_bouman Login to the container with the CONTAINER ID
docker exec -it 47dd5c82b073 bin/bash Create a directory for your theme in the container
mkdir /opt/jboss/keycloak/themes/raincatcher-theme I blogged about creating a custom theme here so I have a git repo with a theme so I cloned it to my local machine
git clone https://github.com/austincunningham/raincatcher-keycloak-theme.git Copied the contents of the theme directory from my local machine to the new directory on the running container
docker cp raincatcher-keycloak-theme/. 47dd5c82b073:/opt/jboss/keycloak/themes/raincatcher-theme Restart the container
docker restart 47dd5c82b073 You should be able to select the image from the drop down once the container restarts
Exit the docker exec
So that it , you will need to build a new image from the container and tag and push the image to save your changes.
# create a new image docker commit 47dd5c82b073 keycloak-raincatcher-theme # get the image docker images REPOSITORY TAG IMAGE ID CREATED SIZE keycloak-raincatcher-theme latest e4b21b3b1d08 3 minutes ago 742MB jboss/keycloak latest d9fadb38a379 10 days ago 739MB # tag the image docker tag e4b21b3b1d08 austincunningham/keycloak-raincatcher-theme:tryme # Push the image to your container registry docker push austincunningham/keycloak-raincatcher-theme The push refers to repository [docker.io/austincunningham/keycloak-raincatcher-theme] 2d33410048d1: Pushed fb389e3f2046: Pushed fca96e33d836: Pushed 78a4ef8d1c42: Pushed 133b5003f6eb: Pushed 1776c40df06e: Pushed tryme: digest: sha256:3b6f1975247fc7ed01a67538b34d8c04155e07ee78a9235e076c71f1ba81c0a4 size: 1581 # My docker image can be got here docker pull austincunningham/keycloak-raincatcher-theme # And run with docker run -p 8080:8080 -e KEYCLOAK_USER=admin -e KEYCLOAK_PASSWORD=admin austincunningham/keycloak-raincatcher-theme:tryme 
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