ubuntu 20.04gitlab-runner docker方式安装使用

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需求：新增一个办公室的runner来跑CI，本次机器为全新机器无基础环境，详细操作步骤如下：

# 新建gitlab-runner用户
vim  add_gitlab-runner_user.sh
apt-get install vim
# 安装docker
apt-get update
# 安装 apt 依赖包，用于通过HTTPS来获取仓库:
apt-get install     apt-transport-https     ca-certificates     curl     gnupg-agent     software-properties-common
# 添加 Docker 的官方 GPG 密钥：
curl -fsSL https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
# 使用以下指令设置稳定版仓库
add-apt-repository    "deb [arch=amd64] https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/ \$(lsb_release -cs) \stable"
# 安装最新版本的 Docker Engine-Community 和 containerd 
apt-get update
apt-get install docker-ce docker-ce-cli containerd.io
systemctl status docker.service
# 命令自动补全
vim /etc/bash.bashrc# 官网 https://docs.gitlab.com/runner/install/docker.html
# Use local system volume mounts to start the Runner container
docker run -d --name gitlab-runner --restart always \-v /srv/gitlab-runner/config:/etc/gitlab-runner \-v /var/run/docker.sock:/var/run/docker.sock \gitlab/gitlab-runner:latest
# To register a runner using a Docker container
docker run --rm -it -v /srv/gitlab-runner/config:/etc/gitlab-runner gitlab/gitlab-runner register
1. Enter your GitLab instance URL (also known as the gitlab-ci coordinator URL). 
**[gitlab地址]**
2. Enter the token you obtained to register the runner.[runner-token]
3. Enter a description for the runner. You can change this value later in the GitLab user interface.
[自定义，随便写]
4. Enter the tags associated with the runner, separated by commas. You can change this value later in the GitLab user interface.
[自定义，随便写]
5. Provide the runner executor. For most use cases, enter [docker.]
6. If you entered docker as your executor, you’ll be asked for the default image to be used for projects that do not define one in .gitlab-ci.yml.
[默认runner镜像，一般为alpine:latest，可以在gitlan-ci.yaml中指定镜像]# 登录gitlab 管理配置界面https://gitlab.****.com/admin/runners，发现runner状态为share/blocked，点击对应runner-token信息，修改保存