Updated 2017-03-03
Step 1. Set Repository with RHEL/CentOS
# curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-ci-multi-runner/script.rpm.sh | sudo bash
# yum install gitlab-ci-multi-runner
Step 2. Register GitLab Runner.
# gitlab-ci-multi-runner register
(See GitLab - CI Runner Register x509 Error and GitLab - Register CI Runner)
Step 3. If you use GitLab Runner with Docker. (Must install docker first.)
# usermod -aG docker gitlab-runner
# su - gitlab-runner
# docker login 10.10.10.10:5000
https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/blob/master/docs/install/linux-repository.md
https://docs.gitlab.com/ce/ci/docker/using_docker_images.html