I have a use case where I run Jenkins inside a container using this Jenkins official image <https://hub.docker.com/_/jenkins/>. Then I also need Jenkins to build Docker images, and for that I also run another container, known as docker-in-docker, with this official image with tag 'dind' <https://hub.docker.com/_/docker/>. After I have linked the docker-in-docker container with the Jenkins container, I can successfully ping the docker-in-docker container using the alias from the Jenkins container. However, I am unsure about how I can setup docker build for Jenkins. I installed the Docker build step plugin <https://wiki.jenkins-ci.org/display/JENKINS/Docker+build+step+plugin>, which exposes an option to install Docker, and to connect to a Docker server. I config the install Docker option, and yet `docker` command is not available. I cannot really connect to the Docker server using the alias and port 2375.
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