Command to produce a wildcard ssl certificate using the Let's Encrypt Certificate Authority. Verification is done using the DNS challenge. The resulting certificates can be found in ./ssl/live/example.com.

docker-certbot-wildcard-dns.sh

docker run -it --rm --name certbot \
       -v $(pwd)/ssl:/etc/letsencrypt \
       -v $(pwd)/ssl:/var/lib/letsencrypt \
       certbot/certbot certonly \
       --server https://acme-v02.api.letsencrypt.org/directory \
       --manual \
       --preferred-challenges dns \
       -d *.example.com \
       -d example.com