BirkhoffLee says to #ysitd這個 /root/.local/share/letsencrypt/bin/letsencrypt --email birkhoff.lee.cn@outlook.com --authenticator webroot --webroot-path /var/www/ --rsa-key-size 4096 -d cowbay.birkhoff.me --renew-by-default --agree-tos certonlyat Mon, Jan 4, 2016 9:33 PM