letsencrypt cert request

install

debian:

apt install certbot apache2 openssl

prepare

domain: example.com

mail: foousr@gmail.com

web dir: /var/www/html

request cert

generate ecc-privkey.pem, ecc-csr.pem:

./gen_csr.sh

request cert:

./req_cert.sh

finally output:

cert.pem, chain.pem, fullchain.pem

ecc-privkey.pem -> privkey.pem