About self-hosted runner groups
Note: All organizations have a single default self-hosted runner group. Only enterprise accounts and organizations owned by enterprise accounts can create and manage additional self-hosted runner groups.
Self-hosted runner groups are used to control access to self-hosted runners. Organization admins can configure access policies that control which repositories in an organization have access to the runner group.
If you use GitHub Enterprise Cloud, you can create additional runner groups; enterprise admins can configure access policies that control which organizations in an enterprise have access to the runner group; and organization admins can assign additional granular repository access policies to the enterprise runner group. For more information, see the GitHub Enterprise Cloud documentation.
Changing the access policy of a self-hosted runner group
You can update the access policy of a runner group, or rename a runner group.
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Navigate to the main page of the repository or organization where your self-hosted runner groups are located.
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Click Settings.
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サイドバーでActions（アクション）をクリックしてください。
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Click Runner groups.
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In the list of groups, click the runner group you'd like to configure.
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Modify the access options, or change the runner group name.
Warning
セルフホストランナーは、プライベートリポジトリでのみ利用することをおすすめします。 これは、ワークフロー中でコードを実行するPull Requestを作成することによって、リポジトリのフォークが危険なコードをセルフホストランナーマシン上で実行できる可能性があるためです。
For more information, see "About self-hosted runners."