Install Cert

1. $ sudo apt-get update
2. $ sudo apt-get install software-properties-common
3. $ sudo add-apt-repository universe
4. $ sudo add-apt-repository ppa:certbot/certbot
5. $ sudo apt-get update
6. $ sudo apt-get install certbot

description from compiler

1. install golang
2. compile => $GOOS=linux GOARCH=amd64 go build -v ./main.go ( on mac for linux )
3. set cronjob every day at midle of night

using binnary

1. ./main (only for linux)