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tls_private_key

Specify the path to the TLS private key file that corresponds to the tls_certificate.

The default, if unspecified, is to dynamically allocate a self-signed certificate.

kumo.start_http_listener {
  -- ..
  tls_private_key = '/path/to/key.pem',
}

You may specify that the key be loaded from a HashiCorp Vault:

kumo.start_http_listener {
  -- ..
  tls_private_key = {
    vault_mount = 'secret',
    vault_path = 'tls/mail.example.com.key',

    -- Specify how to reach the vault; if you omit these,
    -- values will be read from $VAULT_ADDR and $VAULT_TOKEN

    -- vault_address = "http://127.0.0.1:8200"
    -- vault_token = "hvs.TOKENTOKENTOKEN"
  },
}

The key must be stored as key under the path specified. For example, you might populate it like this:

$ vault kv put -mount=secret tls/mail.example.com key=@mail.example.com.key