- acme-client configuration file

# cp /etc/examples/acme-client.conf /etc

/etc/acme-client.conf:

...
domain example.com {
	alternative names { secure.example.com }
	domain key "/etc/ssl/private/example.com.key"
	domain full chain certificate "/etc/ssl/example.com.fullchain.pem"
	# Test with the staging server to avoid aggressive rate-limiting.
	#sign with letsencrypt-staging
	sign with letsencrypt
}

# acme-client -v example.com