Custom certificate authorities

    Flatcar Container Linux supports custom Certificate Authorities (CAs) in addition to the default list of trusted CAs. Adding your own CA allows you to:

    • Use a corporate wildcard certificate
    • Use your own CA to communicate with an installation of CoreUpdate

    The setup process for any of these use-cases is the same:

    1. Copy the PEM-encoded certificate authority file (usually with a .pem file name extension) to /etc/ssl/certs

    2. Run the update-ca-certificates script to update the system bundle of Certificate Authorities. All programs running on the system will now trust the added CA.

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