[SSL] Auto-renewal SSL on CentOS (let's encrypt, certbot)

To renew ssl automatically, 

We can use crontab.

 

Step 1. enter crontab edit mode

$ sudo crontab -e

 

Step 2. certbot auto-renewal script 

## certbot
30 4 * * 0 certbot renew >> /home/log/certbot/cert_$(date +\%Y\%m\%d).log

above script will be executed 4:30 AM on every Sunday.

and the execution log will be stored in the "/home/log/certbot/" folder.