系统：Ubuntu 18.04.1 LTS
gitlab版本：11.9
使用gitlab服务器域名：https://gitlab.example.com
需要使用到url和token:gitlab服务器地址+/admin/runners
要在GNU / Linux下注册Runner：
运行以下命令：
gitlab-runner register
输入您的GitLab实例URL：
Please enter the gitlab-ci coordinator URL (e.g. https://gitlab.com )
https://gitlab.com
输入您获得的令牌以注册Runner：
Please enter the gitlab-ci token for this runner
XXX
输入Runner的描述，您可以稍后在GitLab的UI中更改：
<pre class="has" style="margin-left:0px;" name="code"><code class="language-highlight">Please enter the gitlab-ci description for this runner
[hostame] my-runner
输入与Runner关联的标签，您可以稍后在GitLab的UI中更改：
·
<pre class="has" style="margin-left:0px;" name="code"><code class="language-highlight">Please enter the gitlab-ci tags for this runner (comma separated):
my-tag,another-tag
输入Runner执行程序：
<pre class="has" style="margin-left:0px;" name="code"><code class="language-highlight">Please enter the executor: ssh, docker+machine, docker-ssh+machine, kubernetes, docker, parallels, virtualbox, docker-ssh, shell:
docker
如果您选择Docker作为执行程序，则会要求您将默认图像用于未在其中定义的项目.gitlab-ci.yml：
<pre class="has" style="margin-left:0px;" name="code"><code class="language-highlight">Please enter the Docker image (eg. ruby:2.1):
alpine:latest
第五步报错,报错信息如下：
ERROR: Registering runner... failed runner=6HkNBVen status=couldn't execute POST against https://gitlab.example.com/api/v4/runners: Post https://gitlab.example.com/api/v4/runners: x509: certificate signed by unknown authority
PANIC: Failed to register this runner. Perhaps you are having network problems
证书签名错误,在网上找了许多办法还是不行，解决办法：
gitlab-runner register \
--non-interactive \
--tls-ca-file=/etc/gitlab/ssl/gitlab.example.com.crt \
--url "https://gitlab.example.com/" \
--registration-token "6HkNBVenPd9sMyd2HzhK" \
--executor "docker" \
--docker-image maven:latest \
--description "runner " \
--tag-list "run" \
--run-untagged \
--locked="false"
找到gitlab文件夹下,就看到了,把证书文件带上
其他版本注册方式：
https://docs.gitlab.com/11.9/runner/register/index.html