简介
基本概念
GitLab-CI
GitLab-CI 即为 GitLab Continuous Integration，也就是GitLab自带的持续集成工具。
其思想就是每次用户push代码到GitLab上时触发执行gitlab-ci.yml 脚本，脚本的内容包括了测试，编译，部署等一系列自定义的内容。
GitLab-Runner
安装
$ curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-ci-multi-runner/script.rpm.sh | sudo bash
$ sudo yum install gitlab-ci-multi-runner
详细可参考GitLab runner官网安装教程
注册
向GitLab-CI注册一个Runner需要两样东西：GitLab-CI的url和注册token。可以在项目代码仓库中找到
找到token之后，运行下面这条命令注册Runner
$ sudo gitlab-ci-multi-runner register
按照提示输入URL
Please enter the gitlab-ci coordinator URL (e.g. https://gitlab.com )
https://gitlab.com
输入token
Enter the token you obtained to register the Runner:
Please enter the gitlab-ci token for this runner
xxx
输入描述（此描述后续可在界面上修改）
Enter a description for the Runner, you can change this later in GitLab's UI:
Please enter the gitlab-ci description for this runner
[hostame] my-runner
输入与这个runner相关的tag，gitlab-ci.yml可通过此tag触发该runner构建流水线任务（此处也可后续在界面修改）
Enter the tags associated with the Runner, you can change this later in GitLab's UI:
Please enter the gitlab-ci tags for this runner (comma separated):
my-tag,another-tag
是否允许没有tag的任务执行
Choose whether the Runner should pick up jobs that do not have tags, you can change this later in GitLab's UI (defaults to false):
Whether to run untagged jobs [true/false]:
[false]: true
是否对当前项目锁定Runner
Choose whether to lock the Runner to the current project, you can change this later in GitLab's UI. Useful when the Runner is specific (defaults to true):
Whether to lock Runner to current project [true/false]:
[true]: true
选择Runner的执行器
Enter the Runner executor:
Please enter the executor: ssh, docker+machine, docker-ssh+machine, kubernetes, docker, parallels, virtualbox, docker-ssh, shell:
shell
如果上一步选择了docker，这一步需要填写
If you chose 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:
Please enter the Docker image (eg. ruby:2.1):
alpine:latest
详细可参考官方文档
注册完成之后，GitLab-CI就会多出一条Runner记录,GitLab-CI会为这个Runner生成一个唯一的token，以后Runner就通过这个token与GitLab-CI进行通信。
然后点击页面右侧Shared Runners中的按钮，使按钮状态变为Disabled Shared Runners。
$ sudo gitlab-ci-multi-runner list/verify
配置
gitlab-ci.yml
这个是在git项目的根目录下的一个文件，记录了一系列的阶段和执行规则,包含一系列的执行脚本和指定的runner名称。GitLab-CI在push后会解析它，根据里面的内容调用runner来运行。
详细可参考官方文档
启动
sudo gitlab-ci-multi-runner start 后台启动
sudo gitlab-ci-multi-runner run 前台启动
sudo gitlab-ci-multi-runner status 查看状态
sudo gitlab-runner -debug run 前台启动（调试模式，会在console输出log）
