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Using a remote Ignition config
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With Ignition, you are not limited to the configuration provided locally to a system and you can retrieve other Ignition configs from a remote source. Those configs will then either replace or be merged into the existing config.
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The following examples show how to retrieve an Ignition file from a remote source. They are both set to replace the current configuration with a remote Ignition file.
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Retrieving a remote Ignition file via HTTP
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variant: fcos version: 1.4.0 ignition: config: replace: source: http://example.com/sample.ign verification: hash: sha512-e2bb19fdbc3604f511b13d66f4c675f011a63dd967b97e2fe4f5d50bf6cb224e902182221ba0f9dd87c0bb4abcbd2ab428eb7965aa7f177eb5630e7a1793e2e6
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Retrieving a remote Ignition file via HTTPS with a custom certificate authority
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variant: fcos version: 1.4.0 ignition: config: replace: source: https://example.com/sample.ign security: tls: certificate_authorities: - source: https://example.com/source1 verification: hash: sha512-e2bb19fdbc3604f511b13d66f4c675f011a63dd967b97e2fe4f5d50bf6cb224e902182221ba0f9dd87c0bb4abcbd2ab428eb7965aa7f177eb5630e7a1793e2e6
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The certificate authorities listed here are not automatically added to the host filesystem. They are solely used by Ignition itself when fetching over `https`. If you'd like to also install them on the host filesystem, include them as usual under the `storage.files` array.
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In some cases, if you need to merge a local configuration and one or several remote ones, you can use the `merge` rather than `replace` in a Butane config.
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Retrieving a remote Ignition file via HTTP and merging it with the current config
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variant: fcos version: 1.4.0 ignition: config: merge: - source: http://example.com/sample.ign verification: hash: sha512-e2bb19fdbc3604f511b13d66f4c675f011a63dd967b97e2fe4f5d50bf6cb224e902182221ba0f9dd87c0bb4abcbd2ab428eb7965aa7f177eb5630e7a1793e2e6 passwd: users: - name: core ssh_authorized_keys: - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDHn2eh...
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