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docs: Explain how to configure a list through env variables (#4522)
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@ -35,6 +35,23 @@ REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/somewhere
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This variable overrides the `/var/lib/registry` value to the `/somewhere`
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directory.
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In order to override elements of a list, provide the index of the element
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you wish to change as part of the path to that element. For example, to
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configure the `hosts` list under `letsencrypt`:
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```yaml
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http:
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tls:
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letsencrypt:
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hosts: [myregistryaddress.org]
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```
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The corresponding environment variable would be:
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```sh
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REGISTRY_HTTP_TLS_LETSENCRYPT_HOSTS_0=registry.example.com
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```
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> **Note**: Create a base configuration file with environment variables that can
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> be configured to tweak individual values. Overriding configuration sections
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> with environment variables is not recommended.
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