1. configure a `/etc/letsencrypt/rfc2136-credentials.ini` file with the following content (e.g. on che), the `dns_rfc2136_name`, `dns_rfc2136_secret` and `dns_rfc2136_algorithm` parameters are magic and come from the DNS primary :
1. configure a `/etc/letsencrypt/rfc2136-credentials.ini` file with the following content (e.g. on che), the `dns_rfc2136_name`, `dns_rfc2136_secret` and `dns_rfc2136_algorithm` parameters are magic and come from the DNS primary :