2018 letsencrypt for sever
Test certbot
https://www.ssllabs.com/ssltest/analyze.html
cd /usr/share/letsencrypt
service httpd stop
./certbot-auto renew
./certbot-auto certonly --force-renew --cert-name live-domain-use
./certbot-auto certonly --force-renew -d cycht.org.tw -d www.cycht.org.tw -d m.cycht.org.tw -d main.cycht.org.tw
./certbot certonly — expand -d domain1,domain2,domain3
remove only domian
./certbot-auto delete --cert-name pstock.idv.tw