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diff --git a/doc/pages/getting_started_part_three.md b/doc/pages/getting_started_part_three.md index ef47abef3a0..1697b5cd6b4 100644 --- a/doc/pages/getting_started_part_three.md +++ b/doc/pages/getting_started_part_three.md @@ -1,383 +1 @@ -# GitLab Pages from A to Z: Part 3 - -- _[Part 1: Static Sites, Domains, DNS Records, and SSL/TLS Certificates](getting_started_part_one.md)_ -- _[Part 2: Quick Start Guide - Setting Up GitLab Pages](getting_started_part_two.md)_ -- **Part 3: Creating and Tweaking `.gitlab-ci.yml` for GitLab Pages** - ---- - -## Creating and Tweaking `.gitlab-ci.yml` for GitLab Pages - -[GitLab CI](https://about.gitlab.com/gitlab-ci/) serves -numerous purposes, to build, test, and deploy your app -from GitLab through -[Continuous Integration, Continuous Delivery, and Continuous Deployment](https://about.gitlab.com/2016/08/05/continuous-integration-delivery-and-deployment-with-gitlab/) -methods. You will need it to build your website with GitLab Pages, -and deploy it to the Pages server. - -What this file actually does is telling the -[GitLab Runner](https://docs.gitlab.com/runner/) to run scripts -as you would do from the command line. The Runner acts as your -terminal. GitLab CI tells the Runner which commands to run. -Both are built-in in GitLab, and you don't need to set up -anything for them to work. - -Explaining [every detail of GitLab CI](https://docs.gitlab.com/ce/ci/yaml/README.html) -and GitLab Runner is out of the scope of this guide, but we'll -need to understand just a few things to be able to write our own -`.gitlab-ci.yml` or tweak an existing one. It's an -[Yaml](http://docs.ansible.com/ansible/YAMLSyntax.html) file, -with its own syntax. You can always check your CI syntax with -the [GitLab CI Lint Tool](https://gitlab.com/ci/lint). - -**Practical Example:** - -Let's consider you have a [Jekyll](https://jekyllrb.com/) site. -To build it locally, you would open your terminal, and run `jekyll build`. -Of course, before building it, you had to install Jekyll in your computer. -For that, you had to open your terminal and run `gem install jekyll`. -Right? GitLab CI + GitLab Runner do the same thing. But you need to -write in the `.gitlab-ci.yml` the script you want to run so -GitLab Runner will do it for you. It looks more complicated then it -is. What you need to tell the Runner: - -``` -$ gem install jekyll -$ jekyll build -``` - -### Script - -To transpose this script to Yaml, it would be like this: - -```yaml -script: - - gem install jekyll - - jekyll build -``` - -### Job - -So far so good. Now, each `script`, in GitLab is organized by -a `job`, which is a bunch of scripts and settings you want to -apply to that specific task. - -```yaml -job: - script: - - gem install jekyll - - jekyll build -``` - -For GitLab Pages, this `job` has a specific name, called `pages`, -which tells the Runner you want that task to deploy your website -with GitLab Pages: - -```yaml -pages: - script: - - gem install jekyll - - jekyll build -``` - -### The `public` directory - -We also need to tell Jekyll where do you want the website to build, -and GitLab Pages will only consider files in a directory called `public`. -To do that with Jekyll, we need to add a flag specifying the -[destination (`-d`)](https://jekyllrb.com/docs/usage/) of the -built website: `jekyll build -d public`. Of course, we need -to tell this to our Runner: - -```yaml -pages: - script: - - gem install jekyll - - jekyll build -d public -``` - -### Artifacts - -We also need to tell the Runner that this _job_ generates -_artifacts_, which is the site built by Jekyll. -Where are these artifacts stored? In the `public` directory: - -```yaml -pages: - script: - - gem install jekyll - - jekyll build -d public - artifacts: - paths: - - public -``` - -The script above would be enough to build your Jekyll -site with GitLab Pages. But, from Jekyll 3.4.0 on, its default -template originated by `jekyll new project` requires -[Bundler](http://bundler.io/) to install Jekyll dependencies -and the default theme. To adjust our script to meet these new -requirements, we only need to install and build Jekyll with Bundler: - -```yaml -pages: - script: - - bundle install - - bundle exec jekyll build -d public - artifacts: - paths: - - public -``` - -That's it! A `.gitlab-ci.yml` with the content above would deploy -your Jekyll 3.4.0 site with GitLab Pages. This is the minimum -configuration for our example. On the steps below, we'll refine -the script by adding extra options to our GitLab CI. - -### Image - -At this point, you probably ask yourself: "okay, but to install Jekyll -I need Ruby. Where is Ruby on that script?". The answer is simple: the -first thing GitLab Runner will look for in your `.gitlab-ci.yml` is a -[Docker](https://www.docker.com/) image specifying what do you need in -your container to run that script: - -```yaml -image: ruby:2.3 - -pages: - script: - - bundle install - - bundle exec jekyll build -d public - artifacts: - paths: - - public -``` - -In this case, you're telling the Runner to pull this image, which -contains Ruby 2.3 as part of its file system. When you don't specify -this image in your configuration, the Runner will use a default -image, which is Ruby 2.1. - -If your SSG needs [NodeJS](https://nodejs.org/) to build, you'll -need to specify which image you want to use, and this image should -contain NodeJS as part of its file system. E.g., for a -[Hexo](https://gitlab.com/pages/hexo) site, you can use `image: node:4.2.2`. - ->**Note:** -We're not trying to explain what a Docker image is, -we just need to introduce the concept with a minimum viable -explanation. To know more about Docker images, please visit -their website or take a look at a -[summarized explanation](http://paislee.io/how-to-automate-docker-deployments/) here. - -Let's go a little further. - -### Branching - -If you use GitLab as a version control platform, you will have your -branching strategy to work on your project. Meaning, you will have -other branches in your project, but you'll want only pushes to the -default branch (usually `master`) to be deployed to your website. -To do that, we need to add another line to our CI, telling the Runner -to only perform that _job_ called `pages` on the `master` branch `only`: - -```yaml -image: ruby:2.3 - -pages: - script: - - bundle install - - bundle exec jekyll build -d public - artifacts: - paths: - - public - only: - - master -``` - -### Stages - -Another interesting concept to keep in mind are build stages. -Your web app can pass through a lot of tests and other tasks -until it's deployed to staging or production environments. -There are three default stages on GitLab CI: build, test, -and deploy. To specify which stage your _job_ is running, -simply add another line to your CI: - -```yaml -image: ruby:2.3 - -pages: - stage: deploy - script: - - bundle install - - bundle exec jekyll build -d public - artifacts: - paths: - - public - only: - - master -``` - -You might ask yourself: "why should I bother with stages -at all?" Well, let's say you want to be able to test your -script and check the built site before deploying your site -to production. You want to run the test exactly as your -script will do when you push to `master`. It's simple, -let's add another task (_job_) to our CI, telling it to -test every push to other branches, `except` the `master` branch: - -```yaml -image: ruby:2.3 - -pages: - stage: deploy - script: - - bundle install - - bundle exec jekyll build -d public - artifacts: - paths: - - public - only: - - master - -test: - stage: test - script: - - bundle install - - bundle exec jekyll build -d test - artifacts: - paths: - - test - except: - - master -``` - -The `test` job is running on the stage `test`, Jekyll -will build the site in a directory called `test`, and -this job will affect all the branches except `master`. - -The best benefit of applying _stages_ to different -_jobs_ is that every job in the same stage builds in -parallel. So, if your web app needs more than one test -before being deployed, you can run all your test at the -same time, it's not necessary to wait one test to finish -to run the other. Of course, this is just a brief -introduction of GitLab CI and GitLab Runner, which are -tools much more powerful than that. This is what you -need to be able to create and tweak your builds for -your GitLab Pages site. - -### Before Script - -To avoid running the same script multiple times across -your _jobs_, you can add the parameter `before_script`, -in which you specify which commands you want to run for -every single _job_. In our example, notice that we run -`bundle install` for both jobs, `pages` and `test`. -We don't need to repeat it: - -```yaml -image: ruby:2.3 - -before_script: - - bundle install - -pages: - stage: deploy - script: - - bundle exec jekyll build -d public - artifacts: - paths: - - public - only: - - master - -test: - stage: test - script: - - bundle exec jekyll build -d test - artifacts: - paths: - - test - except: - - master -``` - -### Caching Dependencies - -If you want to cache the installation files for your -projects dependencies, for building faster, you can -use the parameter `cache`. For this example, we'll -cache Jekyll dependencies in a `vendor` directory -when we run `bundle install`: - -```yaml -image: ruby:2.3 - -cache: - paths: - - vendor/ - -before_script: - - bundle install --path vendor - -pages: - stage: deploy - script: - - bundle exec jekyll build -d public - artifacts: - paths: - - public - only: - - master - -test: - stage: test - script: - - bundle exec jekyll build -d test - artifacts: - paths: - - test - except: - - master -``` - -For this specific case, we need to exclude `/vendor` -from Jekyll `_config.yml` file, otherwise Jekyll will -understand it as a regular directory to build -together with the site: - -```yml -exclude: - - vendor -``` - -There we go! Now our GitLab CI not only builds our website, -but also **continuously test** pushes to feature-branches, -**caches** dependencies installed with Bundler, and -**continuously deploy** every push to the `master` branch. - -## Advanced GitLab CI for GitLab Pages - -What you can do with GitLab CI is pretty much up to your -creativity. Once you get used to it, you start creating -awesome scripts that automate most of tasks you'd do -manually in the past. Read through the -[documentation of GitLab CI](https://docs.gitlab.com/ce/ci/yaml/README.html) -to understand how to go even further on your scripts. - -- On this blog post, understand the concept of -[using GitLab CI `environments` to deploy your -web app to staging and production](https://about.gitlab.com/2016/08/26/ci-deployment-and-environments/). -- On this post, learn [how to run jobs sequentially, -in parallel, or build a custom pipeline](https://about.gitlab.com/2016/07/29/the-basics-of-gitlab-ci/) -- On this blog post, we go through the process of -[pulling specific directories from different projects](https://about.gitlab.com/2016/12/07/building-a-new-gitlab-docs-site-with-nanoc-gitlab-ci-and-gitlab-pages/) -to deploy this website you're looking at, docs.gitlab.com. -- On this blog post, we teach you [how to use GitLab Pages to produce a code coverage report](https://about.gitlab.com/2016/11/03/publish-code-coverage-report-with-gitlab-pages/). - -||| -|:--|--:| -|[**← Part 2: Quick start guide - Setting up GitLab Pages**](getting_started_part_two.md)|| +This document was moved to [another location](../user/project/pages/getting_started_part_three.md). |