Chapter 2. Customizing the dashboard

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The Red Hat OpenStack Platform (RHOSP) dashboard (horizon) uses a default theme (RCUE), which is stored inside the horizon container. You can add your own theme to the container image and customize certain parameters to change the look and feel of the following dashboard elements:

  • Logo
  • Site colors
  • Stylesheets
  • HTML title
  • Site branding link
  • Help URL

To ensure continued support for modified RHOSP container images, the resulting images must comply with the Red Hat Container Support Policy.

2.1. Obtaining the horizon container image

To obtain a copy of the horizon container image, pull the image either into the undercloud or a separate client system that is running podman.


  • Pull the horizon container image:

    $ sudo podman pull

    You can use this image as a basis for a modified image.

2.2. Obtaining the RCUE theme

The horizon container image uses the Red Hat branded RCUE theme by default. You can use this theme as a basis for your own theme and extract a copy from the container image.


  1. Create a directory for your theme:

    $ mkdir ~/horizon-themes
    $ cd ~/horizon-themes
  2. Start a container that executes a null loop. For example, run the following command:

    $ sudo podman run --rm -d --name horizon-temp /usr/bin/sleep infinity
  3. Copy the RCUE theme from the container to your local directory:

    $ sudo podman cp horizon-temp:/usr/share/openstack-dashboard/openstack_dashboard/themes/rcue .
  4. Terminate the container:

    $ sudo podman kill horizon-temp

    Result: You now have a local copy of the RCUE theme.

2.3. Creating your own theme based on RCUE

To use RCUE as a basis, copy the entire RCUE theme directory rcue to a new location. This procedure uses mytheme as an example name.


  • Copy the theme:

    $ cp -r rcue mytheme

To change the colors, graphics, fonts, and other elements of a theme, edit the files in mytheme. When you edit this theme, check for all instances of rcue including paths, files, and directories to ensure that you change them to the new mytheme name.

2.4. Creating a file to enable your theme and customize the dashboard

To enable your theme in the dashboard container, you must create a file to override the AVAILABLE_THEMES parameter. This procedure uses mytheme as an example name.


  1. Create a new file called in the horizon-themes directory and add the following content:

    AVAILABLE_THEMES = [('mytheme', 'My Custom Theme', 'themes/mytheme')]

    The 12 in the file name ensures this file is loaded after the RCUE file, which uses 11, and overrides the AVAILABLE_THEMES parameter.

  2. Optional: You can also set custom parameters in the file. Use the following examples as a guide:


    Set the HTML title that appears at the top of the browser window.

    SITE_BRANDING = "Example, Inc. Cloud"

    Changes the hyperlink of the theme logo, which normally redirects to horizon:user_home by default.


2.5. Generating a modified horizon image

When your custom theme is ready, you can create a new container image that uses your theme. This procedure uses mytheme as an example name.


  1. Use a Dockerfile to generate a new container image using the original horizon image as a basis, as shown in the following example:

    LABEL name="rhosp-rhel8/openstack-horizon-mytheme" vendor="Acme" version="0" release="1"
    COPY mytheme /usr/share/openstack-dashboard/openstack_dashboard/themes/mytheme
    COPY /etc/openstack-dashboard/local_settings.d/
    RUN sudo chown apache:apache /etc/openstack-dashboard/local_settings.d/
  2. Save this file in your horizon-themes directory as Dockerfile.
  3. Use the Dockerfile to generate the new image:

    $ sudo podman build . -t "" --log-level debug

    The -t option names and tags the resulting image. It uses the following syntax:

    This is usually the location of the container registry that the overcloud eventually uses to pull images. In this instance, you push this image to the container registry of the undercloud, so set this to the undercloud IP and port.
    For consistency, this is usually the same name as the original container image followed by the name of your theme. In this instance, it is rhosp-rhel8/openstack-horizon-mytheme.
    The tag for the image. Red Hat uses the version and release labels as a basis for this tag. If you generate a new version of this image, increment the release, for example,0-2.
  4. Push the image to the container registry of the undercloud:

    $ sudo openstack tripleo container image push --local
  5. Verify that the image has uploaded to the local registry:

      [stack@director horizon-themes]$ curl | jq .repositories[] | grep -i hori
      [stack@director horizon-themes]$
      [stack@director ~]$ sudo openstack tripleo container image list | grep hor
      | docker://director.ctlplane.localdomain:8787/rhosp-rhel8/openstack-horizon:16.0-84
      | docker://director.ctlplane.localdomain:8787/rhosp-rhel8/openstack-horizon:0-5  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<,Uploaded
      [stack@director ~]$

If you update or upgrade Red Hat OpenStack Platform, you must reapply the theme to the new horizon image and push a new version of the modified image to the undercloud.

2.6. Using the modified container image in the overcloud

To use the container image that you modified with your overcloud deployment, edit the environment file that contains the list of container image locations. This environment file is usually named overcloud-images.yaml. This procedure uses mytheme as an example name.


  1. Edit the DockerHorizonConfigImage and DockerHorizonImage parameters to point to your modified container image:

  2. Save this new version of the overcloud-images.yaml file.

2.7. Editing puppet parameters

Director provides a set of dashboard parameters that you can modify with environment files.


Additional resources

2.8. Deploying an overcloud with a customized dashboard


  • To deploy the overcloud with your dashboard customizations, include the following environment files in the openstack overcloud deploy command:

    • The environment file with your modified container image locations.
    • The environment file with additional dashboard modifications.
    • Any other environment files that are relevant to your overcloud configuration.

      $ openstack overcloud deploy --templates \
          -e /home/stack/templates/overcloud-images.yaml \
          -e /home/stack/templates/help_url.yaml \
          [OTHER OPTIONS]
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