Understanding GitHub Actions

Learn the basics of GitHub Actions, including core concepts and essential terminology.

ノート: GitHubホストランナーは、現在GitHub Enterprise Serverでサポートされていません。 GitHubパブリックロードマップで、計画されている将来のサポートに関する詳しい情報を見ることができます。

Overview

GitHub Actions is a continuous integration and continuous delivery (CI/CD) platform that allows you to automate your build, test, and deployment pipeline. You can create workflows that build and test every pull request to your repository, or deploy merged pull requests to production.

GitHub Actions goes beyond just DevOps and lets you run workflows when other events happen in your repository. For example, you can run a workflow to automatically add the appropriate labels whenever someone creates a new issue in your repository.

GitHub provides Linux, Windows, and macOS virtual machines to run your workflows, or you can host your own self-hosted runners in your own data center or cloud infrastructure.

The components of GitHub Actions

You can configure a GitHub Actions workflow to be triggered when an event occurs in your repository, such as a pull request being opened or an issue being created. Your workflow contains one or more jobs which can run in sequential order or in parallel. Each job will run inside its own virtual machine runner, or inside a container, and has one or more steps that either run a script that you define or run an action, which is a reusable extension that can simplify in your workflow.

Workflow overview

Workflows

A workflow is a configurable automated process that will run one or more jobs. Workflows are defined by a YAML file checked in to your repository and will run when triggered by an event in your repository, or they can be triggered manually, or at a defined schedule.

Your repository can have multiple workflows in a repository, each of which can perform a different set of steps. For example, you can have one workflow to build and test pull requests, another workflow to deploy your application every time a release is created, and still another workflow that adds a label every time someone opens a new issue.

Events

An event is a specific activity in a repository that triggers a workflow run. For example, activity can originate from GitHub when someone creates a pull request, opens an issue, or pushes a commit to a repository. You can also trigger a workflow run on a schedule, by posting to a REST API, or manually.

For a complete list of events that can be used to trigger workflows, see Events that trigger workflows.

Jobs

A job is a set of steps in a workflow that execute on the same runner. Each step is either a shell script that will be executed, or an action that will be run. Steps are executed in order and are dependent on each other. Since each step is executed on the same runner, you can share data from one step to another. For example, you can have a step that builds your application followed by a step that tests the application that was built.

You can configure a job's dependencies with other jobs; by default, jobs have no dependencies and run in parallel with each other. When a job takes a dependency on another job, it will wait for the dependent job to complete before it can run. For example, you may have multiple build jobs for different architectures that have no dependencies, and a packaging job that is dependent on those jobs. The build jobs will run in parallel, and when they have all completed successfully, the packaging job will run.

Actions

An action is a custom application for the GitHub Actions platform that performs a complex but frequently repeated task. Use an action to help reduce the amount of repetitive code that you write in your workflow files. An action can pull your git repository from GitHub, set up the correct toolchain for your build environment, or set up the authentication to your cloud provider.

You can write your own actions, or you can find actions to use in your workflows in the GitHub Marketplace.

Runners

A runner is a server that runs your workflows when they're triggered. Each runner can run a single job at a time. You must host your own runners for GitHub Enterprise Server. For more information, see "Hosting your own runners."

Create an example workflow

GitHub Actions uses YAML syntax to define the workflow. Each workflow is stored as a separate YAML file in your code repository, in a directory called .github/workflows.

You can create an example workflow in your repository that automatically triggers a series of commands whenever code is pushed. In this workflow, GitHub Actions checks out the pushed code, installs the software dependencies, and runs bats -v.

  1. In your repository, create the .github/workflows/ directory to store your workflow files.
  2. In the .github/workflows/ directory, create a new file called learn-github-actions.yml and add the following code.
    name: learn-github-actions
    on: [push]
    jobs:
      check-bats-version:
        runs-on: ubuntu-latest
        steps:
          - uses: actions/checkout@v2
          - uses: actions/setup-node@v2
            with:
              node-version: '14'
          - run: npm install -g bats
          - run: bats -v
    
  3. Commit these changes and push them to your GitHub repository.

Your new GitHub Actions workflow file is now installed in your repository and will run automatically each time someone pushes a change to the repository. For details about a job's execution history, see "Viewing the workflow's activity."

Understanding the workflow file

To help you understand how YAML syntax is used to create a workflow file, this section explains each line of the introduction's example:

name: learn-github-actions
Optional - The name of the workflow as it will appear in the Actions tab of the GitHub repository.
on: [push]
Specifies the trigger for this workflow. This example uses the push event, so a workflow run is triggered every time someone pushes a change to the repository or merges a pull request. This is triggered by a push to every branch; for examples of syntax that runs only on pushes to specific branches, paths, or tags, see "Workflow syntax for GitHub Actions."
jobs:
Groups together all the jobs that run in the learn-github-actions workflow.
check-bats-version:
Defines a job named check-bats-version. The child keys will define properties of the job.
  runs-on: ubuntu-latest
Configures the job to run on the latest version of an Ubuntu Linux runner. This means that the job will execute on a fresh virtual machine hosted by GitHub. For syntax examples using other runners, see "Workflow syntax for GitHub Actions."
  steps:
Groups together all the steps that run in the check-bats-version job. Each item nested under this section is a separate action or shell script.
    - uses: actions/checkout@v2
The uses keyword specifies that this step will run v2 of the actions/checkout action. This is an action that checks out your repository onto the runner, allowing you to run scripts or other actions against your code (such as build and test tools). You should use the checkout action any time your workflow will run against the repository's code.
    - uses: actions/setup-node@v2
      with:
        node-version: '14'
This step uses the actions/setup-node@v2 action to install the specified version of the Node.js (this example uses v14). This puts both the node and npm commands in your PATH.
    - run: npm install -g bats
The run keyword tells the job to execute a command on the runner. In this case, you are using npm to install the bats software testing package.
    - run: bats -v
Finally, you'll run the bats command with a parameter that outputs the software version.

Visualizing the workflow file

In this diagram, you can see the workflow file you just created and how the GitHub Actions components are organized in a hierarchy. Each step executes a single action or shell script. Steps 1 and 2 run actions, while steps 3 and 4 run shell scripts. To find more prebuilt actions for your workflows, see "Finding and customizing actions."

Workflow overview

Viewing the workflow's activity

Once your workflow has started running, you can see a visualization graph of the run's progress and view each step's activity on GitHub.

  1. your GitHub Enterprise Server instanceで、リポジトリのメインページにアクセスしてください。

  2. Under your repository name, click Actions. Navigate to repository

  3. In the left sidebar, click the workflow you want to see. Screenshot of workflow results

  4. Under "Workflow runs", click the name of the run you want to see. Screenshot of workflow runs

  5. Under Jobs or in the visualization graph, click the job you want to see. Select job

  6. View the results of each step. Screenshot of workflow run details

Next steps

To continue learning about GitHub Actions, see "Finding and customizing actions."

To understand how billing works for GitHub Actions, see "About billing for GitHub Actions".

Contacting support

たとえば構文、GitHubホストランナー、アクションの構築など、ワークフローの設定に関して何か支援が必要な場合は、GitHub Community SupportのGitHub Actionsカテゴリで既存のトピックを探してみるか、新しいトピックを開始してください。

GitHub Actionsについてのフィードバックもしくは機能リクエストがあるなら、それらをGitHub Actionsのフィードバックフォームで共有してください。

あなたの利用方法、もしくは意図する利用方法が利用制限のカテゴリに当てはまるかどうかに関わらず、以下のいずれかの場合はyour site administratorに連絡してください。

  • アカウントに間違った制約が課されていると思われる場合
  • たとえばユニークIDのような予想外のエラーに、アクションの実行時に遭遇した場合
  • 既存の動作が期待される、ただし必ずしもドキュメント化されてはいない動作と矛盾するような状況に遭遇した場合

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