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How to fully automate renewing of Let’s Encrypt certificates for multiple sites with Ruby and Let’s Encrypt ACMEv2 protocol

Free Web certificates issuer Let’s Encrypt has announced in the beginning of year, that it will no longer support ACMEv1 protocol for certificate renewal after June 1. 2020. Article describes how to fully automate renew of certificate with Ruby and Let’s Encrypt ACMEv2 protokol.