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+Docker
+======
+
+This page covers how to build FRR Docker images.
+
+Images
+""""""
+FRR has Docker build infrastructure to produce Docker images containing
+source-built FRR on the following base platforms:
+
+* Alpine
+* Centos 7
+* Centos 8
+
+The following platform images are used to support Travis CI and can also
+be used to reproduce topotest failures when the docker host is Ubuntu
+(tested on 18.04 and 20.04):
+
+* Ubuntu 18.04
+* Ubuntu 20.04
+
+The following platform images may also be built, but these simply install a
+binary package from an existing repository and do not perform source builds:
+
+* Debian 10
+
+Some of these are available on `DockerHub
+<https://hub.docker.com/repository/docker/frrouting/frr/tags?page=1>`_.
+
+There is no guarantee on what is and is not available from DockerHub at time of
+writing.
+
+Scripts
+"""""""
+
+Some platforms contain an included build script that may be run from the host.
+This will set appropriate packaging environment variables and clean up
+intermediate build images.
+
+These scripts serve another purpose. They allow building platform packages
+without needing the platform. For example, the Centos 8 docker image can also
+be leveraged to build Centos 8 RPMs that can then be used separately from
+Docker.
+
+If you are only interested in the Docker images and don't want the cleanup
+functionality of the scripts you can ignore them and perform a normal Docker
+build. If you want to build multi-arch docker images this is required as the
+scripts do not support using Buildkit for multi-arch builds.
+
+Building Alpine Image
+---------------------
+
+Script::
+
+   ./docker/alpine/build.sh
+
+No script::
+
+   docker build -f docker/alpine/Dockerfile .
+
+No script, multi-arch (ex. amd64, arm64, armv7)::
+
+   docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -f docker/alpine/Dockerfile -t frr:latest .
+
+
+Building Debian Image
+---------------------
+
+::
+
+   cd docker/debian
+   docker build .
+
+Multi-arch (ex. amd64, arm64, armv7)::
+
+   cd docker/debian
+   docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t frr-debian:latest .
+
+Building Centos 7 Image
+-----------------------
+
+Script::
+
+   ./docker/centos-7/build.sh
+
+No script::
+
+   docker build -f docker/centos-7/Dockerfile .
+
+No script, multi-arch (ex. amd64, arm64)::
+
+   docker buildx build --platform linux/amd64,linux/arm64 -f docker/centos-7/Dockerfile -t frr-centos7:latest .
+
+
+Building Centos 8 Image
+-----------------------
+
+Script::
+
+   ./docker/centos-8/build.sh
+
+No script::
+
+   docker build -f docker/centos-8/Dockerfile .
+
+No script, multi-arch (ex. amd64, arm64)::
+
+   docker buildx build --platform linux/amd64,linux/arm64 -f docker/centos-8/Dockerfile -t frr-centos8:latest .
+
+
+
+Building ubi 8 Image
+-----------------------
+
+Script::
+
+   ./docker/ubi-8/build.sh
+
+Script with params, an example could be this (all that info will go to docker label) ::
+
+   ./docker/ubi-8/build.sh  frr:ubi-8-my-test "$(git rev-parse --short=10 HEAD)" my_release my_name my_vendor
+
+No script::
+
+   docker build -f docker/ubi-8/Dockerfile .
+
+No script, multi-arch (ex. amd64, arm64)::
+
+   docker buildx build --platform linux/amd64,linux/arm64 -f docker/ubi-8/Dockerfile -t frr-ubi-8:latest .
+
+
+
+Building Ubuntu 18.04 Image
+---------------------------
+
+Build image (from project root directory)::
+
+   docker build -t frr-ubuntu18:latest  -f docker/ubuntu18-ci/Dockerfile .
+
+Start the container::
+
+   docker run -d --privileged --name frr-ubuntu18 --mount type=bind,source=/lib/modules,target=/lib/modules frr-ubuntu18:latest
+
+Running a topotest (when the docker host is Ubuntu)::
+
+   docker exec frr-ubuntu18 bash -c 'cd ~/frr/tests/topotests/ospf-topo1 ; sudo pytest test_ospf_topo1.py'
+
+Starting an interactive bash session::
+
+   docker exec -it frr-ubuntu18 bash
+
+Stopping an removing a container::
+
+   docker stop frr-ubuntu18 ; docker rm frr-ubuntu18
+
+Removing the built image::
+
+   docker rmi frr-ubuntu18:latest
+
+
+Building Ubuntu 20.04 Image
+---------------------------
+
+Build image (from project root directory)::
+
+   docker build -t frr-ubuntu20:latest  -f docker/ubuntu20-ci/Dockerfile .
+
+Start the container::
+
+   docker run -d --privileged --name frr-ubuntu20 --mount type=bind,source=/lib/modules,target=/lib/modules frr-ubuntu20:latest
+
+Running a topotest (when the docker host is Ubuntu)::
+
+   docker exec frr-ubuntu20 bash -c 'cd ~/frr/tests/topotests/ospf-topo1 ; sudo pytest test_ospf_topo1.py'
+
+Starting an interactive bash session::
+
+   docker exec -it frr-ubuntu20 bash
+
+Stopping an removing a container::
+
+   docker stop frr-ubuntu20 ; docker rm frr-ubuntu20
+
+Removing the built image::
+
+   docker rmi frr-ubuntu20:latest