install docker-ce

 yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate  docker-logrotate docker-engine -y

 yum install -y yum-utils device-mapper-persistent-data lvm2

 yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

 yum install docker-ce docker-ce-cli  containerd.io -y

增加腾讯云加速器

cat /etc/docker/daemon.json
{
   "registry-mirrors": [
       "https://mirror.ccs.tencentyun.com"
  ]
}

启动docker服务

systemctl start docker

拉起一个容器，测试验证docker

docker run hello-world

install gitlab-runner

wget https://mirrors.cloud.tencent.com/gitlab-runner/yum/el7/gitlab-runner-12.7.1-1.x86_64.rpm

yum install -y gitlab-runner-12.7.1-1.x86_64.rpm

补充：如果是二进制安装gitlan-runner,这需要以下添加：

### creat gitlab-runner user and set docker user-power
useradd --comment 'GitLab Runner' --create-home gitlab-runner --shell /bin/bash
groupadd docker    
gpasswd -a gitlab-runner docker 
newgrp docker  
su gitlab-runner 
docker ps   
gitlab-runner install --user=gitlab-runner --working-directory=/home/gitlab-runner
gitlab-runner start

gitlab-runner向gitlab注册，并install和start gitlab-runner

gitlab-runner register

gitlab-runner install

gitlab-runner start

git push code and check gitlab-cicd jobs