In this tutorial, you will use the acme-dns-certbot hook for Certbot to issue a Let’s Encrypt certificate using DNS validation. The acme-dns-certbot tool is also useful if you want to issue a certificate for a server that isn’t accessible over the internet, such as an internal system or staging environment. Traditional HTTP certificate validation cannot be used in these cases, unless you set the validation files on each and every server. The advantage of this is that you don’t need to integrate Certbot directly with your DNS provider account, nor do you need to grant it unrestricted access to your full DNS configuration, which is beneficial to security.ĭelegated DNS zones are used in order to redirect lookups for the certificate verification records to the third-party DNS service, so once the initial setup has been completed, you can request as many certificates as you want without having to perform any manual validation.Īnother key benefit of acme-dns-certbot is that it can be used to issue certificates for individual servers that may be running behind a load balancer, or are otherwise not directly accessible over HTTP. The acme-dns-certbot tool is used to connect Certbot to a third-party DNS server where the certificate validation records can be set automatically via an API when you request a certificate. Wildcard certificates are also supported using DNS validation. This means that certificates can be issued simultaneously for a cluster of web servers running behind a load balancer, or for a system that isn’t directly accessible over the internet. However, HTTP validation is not always suitable for issuing certificates for use on load-balanced websites, nor can it be used to issue wildcard certificates.ĭNS validation allows for certificate issuance requests to be verified using DNS records, rather than by serving content over HTTP. The majority of Let’s Encrypt certificates are issued using HTTP validation, which allows for the easy installation of certificates on a single server. The author selected the COVID-19 Relief Fund to receive a donation as part of the Write for DOnations program.
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