Containers based Overcloud Deployment

Containers based Overcloud Deployment


The TripleO containers support is still under heavy development. Things documented here may change during the Pike cycle.

This documentation explains how to deploy a fully containerized overcloud on Docker. This feature is supported starting with Pike.

The requirements for a containerized overcloud are the same as for any other overcloud deployment. The real difference is in where the overcloud services will be deployed (containers vs base OS).


The docker-based overcloud architecture is not very different from the baremetal/VM based one. The services deployed in the traditional baremetal overcloud are also deployed in the docker-based one.

One obvious difference between these 2 types of deployments is that the openstack services are deployed as containers in a container runtime rather than in the host operating system. This reduces the required packages in the host to the bare minimum for running the container runtime and managing the base network layer.

Manual overcloud deployment

This section explains how to deploy a containerized overcloud manually. For an automated overcloud deployment, please follow the steps in the Using TripleO Quickstart section below.

Preparing the environment

To prepare your environment, you must follow all the steps described in the Basic Deployment (CLI) documentation. Stop right at the Deploy the Overcloud section.

Populate local docker registry

It’s useful to run a local docker registry on the undercloud to speed up the overcloud deployment. A docker registry is normally already setup to listen on port 8787 as part of the undercloud install.

To use the pre-built images coming from the tripleoupstream registry on the dockerhub, use the following command:

openstack overcloud container image upload --config-file /usr/share/openstack-tripleo-common/container-images/overcloud_containers.yaml

Or use kolla-build to build the images yourself:

kolla-build --base centos --type binary --namespace tripleoupstream --registry --tag latest --template-override /usr/share/tripleo-common/container-images/tripleo_kolla_template_overrides.j2 --push

Finally, point the heat templates to your local registry, for example in a $HOME/docker_registry.yaml file:

  DockerNamespaceIsRegistry: true

Deploying the containerized Overcloud

A containerized overcloud deployment follows all the steps described in the baremetal Deploy the Overcloud documentation with the exception that it requires an extra environment file to be added to the openstack overcloud deploy command:

-e /usr/share/openstack-tripleo-heat-templates/environments/docker.yaml

In case of a local docker registry, also add the path to the override file:

-e $HOME/docker_registry.yaml

Using TripleO Quickstart


Please refer to the TripleO Quickstart docs for more info about quickstart, the minimum requirements, the setup process and the available plugins.

The command below will deploy a containerized overcloud on top of a baremetal undercloud:

bash --config=~/.quickstart/config/general_config/containers_minimal.yml $VIRTHOST
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