https://www.betterbuys.com/estimating-password-cracking-times/

https://www.ssllabs.com

boa leitura sobre o zfs.
http://nex7.blogspot.com/2013/03/readme1st.html

https://codeburst.io/direct-connection-to-a-docker-container-with-ssh-5…

https://medium.com/@containeroo/traefik-2-0-route-external-services-thr…
https://medium.com/@containeroo/traefik-2-0-docker-a-simple-step-by-ste…
https://medium.com/@containeroo/traefik-2-0-docker-an-advanced-guide-d0…

https://support.mozilla.org/en-US/kb/fix-login-issues-on-websites-requi…

https://www.datadoghq.com/blog/nginx-502-bad-gateway-errors-php-fpm/

apt update
apt full-upgrade
apt install nginx mariadb-server php-fpm php-mysql
mysql_secure_installation

https://www.digitalocean.com/community/tutorials/how-to-install-linux-n…

https://www.the-lazy-dev.com/en/fail2ban-client-show-banned-ips/

editamos o ficheiro /etc/mdadm/mdadm.conf e a seguir ao texto MAILADDR colocamos o endereço de e-mail pretendido.
finalmente reiniciamos o serviço:
systemctl status mdmonitor.service

https://www.howtoforge.com/how-to-configure-software-raid-to-send-an-em…